Multiquip ST70 User Manual

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PARTS AND OPERATION MANUAL

MODEL ST-70

Structural Concrete Pump

(Hatz Diesel Engine)

Revision #4 (05/29/07)

To find the latest revision of this

publication, visit our website at:

www.multiquip.com

THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.

Diesel engine exhaust and some of

PAGE 2 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

NOTE PAGE

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 3

TABLE OF CONTENTS

Here's How To Get Help .......................................... 3

Table Of Contents ................................................... 4

Parts Ordering Procedures ..................................... 5

ST-70

Specifications .......................................................... 6

Pump Warranty ....................................................... 7

Safety Instructions ............................................. 8-10

Important Hand Signals ........................................ 11

General Information ......................................... 12-13

Concrete Mix Information ................................ 14-17

Slump Test Procedure ........................................... 18

Operation (How it Works) ...................................... 19

Initial Start-up Procedure ................................. 22-25

Operating Procedures...................................... 26-30

Towing Information ........................................... 31-33

Explanation Of Codes In Remarks Column .......... 34

Suggested Spare Parts ......................................... 35

Decals Safety ................................................... 36-37

Service Information

Wiring Schematic:

1) Interior Control Panel (Inside Door) ............... 74

2) Schematic Electrical Control Box .............. 75-76

3) Interconnect Electrical Control Box ................ 77

Hydraulic Diagram ........................................... 78-79

Optional Radio Control.......................................... 80

Safety Service Procedures ................................... 81

Maintenance Check Schedule ......................... 82-83

Pressure Setting Sequence .................................. 84

Accumulator Circuit ............................................... 85

Hydraulic System Troubleshooting ........................ 86

Electrical System ................................................... 87

Changing Concrete Cylinder Piston Cups ............ 88

Changing the Wear Plate and Ring ...................... 89

Wheel Bearings ..................................................... 90

Terms and Conditions Of Sale — Parts ................. 91

Component Illustrations

Control Panel Installation................................. 38-39

Control Panel Front ..........................................40-41

Control Panel Interior .......................................42-44

Main Drive Pumps ...........................................46-47

Manifold (Control) ............................................48-49

Accumulator .....................................................50-51

Hydraulic/Concrete Cylinders ..........................52-53

Shuttle Tube Assy ............................................54-55

Hopper Assy ....................................................56-57

Remixer Control Assy ...................................... 58-59

Throttle Assy .................................................... 60-61

Engine and Frame ........................................... 62-63

Oil Cooler Assy ................................................ 64-65

Fuel and Hydraulic Tank .................................. 66-67

Battery,Tail Lights,Water Separator,Gauges ...68-69

Axle and Brakes............................................... 70-71

Hydarulic Surge Brake and Hitch ..................... 72-73

NOTE: Specification and part number are subject to change without notice.

PAGE 4 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

Effective: January 1st, 2006

Ordering parts has never been easier!

PARTS ORDERING PROCEDURES

Choose from three easy options:

Best Deal!

Order via Internet (Dealers Only):

Order parts on-line using Multiquip’s SmartEquip website!

■

View Parts Diagrams

■

Order Parts

■

Print Specification Information

Goto www.multiquip.com and click on

Order Par ts

to log in and save!

Order via Fax (Dealers Only):

All customers are welcome to order parts via Fax.

Domestic (US) Customers dial:

1-800-6-PARTS-7 (800-672-7877)

Order via Phone:

Non-Dealer Customers:

Contact your local Multiquip Dealer for parts or call 800-427-1244 for help in locating a dealer near you.

If you have an MQ Account, to obtain a Username and Password, E-mail us at:

parts@multiquip.com.

To obtain an MQ Account, contact your District Sales Manager for more information.

Use the

internet

Standard orders

complete part numbers.*

Fax

your order in and qualify for a 2% Discount

Standard orders

complete part numbers.*

Domestic (US) Dealers Call:

1-800-427-1244

and qualify for a 5% Discount

for all orders which include

International Customers

their local Multiquip Representatives for Parts Ordering information.

Note: Discounts Are Subject To Change

should contact

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❒❒

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❒❒ ❒❒

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www.multiquip.com

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 5

When ordering parts, please supply:

❒❒

Dealer Account Number

Dealer Name and Address

Shipping Address (if different than billing address)

Return Fax Number Applicable Model Number

Quantity, Part Number and Description of Each Part

NOTE

All orders are treated as and will ship the same day if received prior to 3PM PST.

WE ACCEPT ALL MAJOR CREDIT CARDS!

❒

❒❒

Standard Orders

Specify Preferred Method of Shipment:

✓

UPS/Fed Ex

■

Priority One

■

Ground

■ Next Day

■

Second/Third Day

✓ DHL ✓

Tr u c k

ST-70 SPECIFICATIONS

PERFORMANCE U.S. METRIC

Pumping Rate — Volume Output 70 yd/hr.* (54m/hr)* Maximum Aggregate Size 1 1/2" minus (38 mm)

Verticle Pumping Height ................................................. 300 ft.*..................................................................... (91m)*

Horizontal Pumping Distance ......................................... 1200 ft.* ................................................................... (366m)*

Engine — Diesel ............................................................. HATZ 4M40L: 80HP(59.68KW)

Hopper Capacity 10 cu. ft. capacity with optional forward/reverse re-mixer

Line Size ........................................................................ 3", 4" or 5" dia.

Electrical System ............................................................ 12 v D.C.

Hydraulic Oil System ...................................................... 58 gal.

Fuel Tank Capacity ......................................................... 20 gal.

Weight (with fluids) ......................................................... 4700 lb. ................................................................... (2132kg)

Tire Size ......................................................................... 7.35 - 14, 8 ply

Brakes ............................................................................ 12" dia. Hydraulic Surge

All Steel Trailer Frame

DIMENSIONS

L x W x H ........................................................................ 149" X 67" X 55" ...................................................... (356 X 170 X 140cm)

Weight (Shipping)........................................................... 4,700 lbs. ................................................................ (2132kg)

*These figures will vary with Pump Model, concrete mix design, line size, job site conditions and engine option. Mayco reserves the right to change and modify the above specifications or design without notice or obligation.

PAGE 6 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

MAYCO PUMP WARRANTY

Mechanical Drive Models

MAYCO PUMP, hereinafter referred to as “Manufacturer’, warrants each new Mayco Pump sold by the manufacturer to be free from defects in material and workmanship, under normal use and service, for a period of one year after the date of delivery to the original retail purchaser. Manufacturer will, at its option, replace or repair at a point designated by the Manufacturer any part or parts which shall appear to the satisfaction of the Manufacturer upon inspection at such point to have been defective in material or workmanship. This warranty does not obligate the Manufacturer to bear any transportation charges or labor charges in connection with the replacement or repair the of the defective parts.

This warranty does not apply to any pump if attempts have been made to pump concrete materials which have separated, to any pump which has been repaired with other than Genuine Mayco Parts, nor to any pump which has been altered, repaired or used in such manner as to adversely affect its performance, nor to normal service or maintenance or where blockages have developed within the pump manifold or placing line or which has been operated in any other manner not recommended by the Manufacturer. Due to the abrasive nature of concrete, Mayco does not cover natural component wear.

Hydraulic Drive Models

MAYCO PUMP, hereinafter referred to as “Manufacturer”, warrants each new Mayco Pump sold by the manufacturer to be free from defects in material and workmanship, under normal use and service, for a period of one year or 2000 hours after the date of delivery to the original retail purchaser. The Manufacturer will, at its option, replace or repair at a point designated by Manufacturer any part or parts which shall appear to the satisfaction of Manufacturer upon inspection at such point to have been defective in material or workmanship. This warranty does not obligate Manufacturer to bear any transportation charges or labor charges in connection with the replacement or repair of the defective parts.

This warranty does not apply to any pump if attempts have been made to pump concrete materials which have separated, to any pump which has been repaired with other than Genuine Mayco Parts, nor to any pump which has been altered, repaired or used in such manner as to adversely affect it’s performance, nor to normal service or maintenance or where blockages have developed within the pump manifold or placing line or which has been operated in any other manner not recommended by the Manufacturer. Due to the abrasive nature of concrete, Mayco does not cover natural component wear.

THIS WARRANTY AND MANUFACTURER’S OBLIGATION HEREUNDER, IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS, IMPLIED OR STATUTORY AND ALL OTHER OBLIGATIONS OR LIABILITIES INCLUDING SPECIAL OR CONSEQUENTIAL DAMAGES OR CONTINGENT LIABILITIES ARISING OUT OF THE FAILURE OF ANY PUMP OR PART TO OPERATE PROPERLY, INCLUDING ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 7

ST-70 — SAFETY INSTRUCTIONS

READ THIS PARTS AND OPERATION MANUAL THOROUGHLY BEFORE USING THIS MACHINE. It describes the safe, proper and most efficient way to operate it. KNOW YOUR MACHINE!



When operating concrete pumps the safety regulations of the responsible employers’ liability insurance company must be observed. The observation of these regulations shall be the responsibility of the contractor and operator.



The following are some supplementary recommendations:



All safety devices and provisions against accidents such as warning labels and information signs, coverings, etc. must be in place. Do not remove or tamper with them. If they are missing, replace them.



Check the operational reliability of the machine each time before it is put into operation. Any defects found must be repaired immediately.



Allow the machine to be operated and maintained by qualified personnel only.



Before leaving the machine, protect it from unauthorized use and unintentional movements.



Unauthorized presence in the immediate area of the concrete pump is not allowed. Warn persons who are in the immediate area. Stop work if persons do not leave the area after having been warned.



Wear personal protective equipment when operating the machine.

TRAVEL AND TRANSPORTATION

The machine must not be moved with extended outriggers. Before traveling, check the transportation safety devices of

the outriggers, the tire pressure and the functioning of the brakes.

Use hoisting units with transport devices complying with safety requirements.

Hoisting cables or equipment are to be applied only at the lifting points provided.

TOWING:

1. Read the Atwood Hydraulic Surge Brake Installation

Instructions.

2. The pump should not be towed in excess of 55 MPH (less

depending on road conditions). It can be towed with any truck rated to pull a 5000 lb. load.

3. Before towing, check with local and state laws for proper

compliance. (Refer to page 31) a. Secure the hitch on the ball and attach the breakaway

cable and safety chain to the towing vehicle.

b. Raise all stand pipes and secure.

4. Use only a 2” one-piece, all-steel, machined or forged ball

rated at 5000 lbs. minimum capacity.

5. Do not tow the pump with concrete in the hopper.

ARNING! DANGER OF AMPUTARNING! DANGER OF AMPUT



ARNING! DANGER OF AMPUT

ARNING! DANGER OF AMPUTARNING! DANGER OF AMPUT

Never place your hands or any part of your body in the hopper or allow anyone else to do so while the engine is running or when there is accumulator hydraulic pressure or series injury could result.

TION!TION!

TION!

TION!TION!

6. Do not tow the pump with the concrete reducers attached.

7. Check all wheel lug bolts for proper tightness prior to towing.

PAGE 8 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SAFETY INSTRUCTIONS

STABILIZER JACK

Prior to jacking check the soil conditions. If necessary, enlarge the support foot area by placing square timbers underneath.

Keep a sufficient distance from excavations; slopes could break away because of support pressures.

On inclines and slopes place chocks behind the wheels. Jack the pump in such a manner that it is in a horizontal (level)

position. Check the position of the pump frequently.

CONCRETE PUMP

To avoid splashes due to suction of air, the agitator hopper must always be filled with concrete up to the mixing shaft.

DO NOT OPERATE ANY CONCRETE PUMP WITHOUT THE HOPPER GRILL FIRMLY IN PLACE.

NEVER ALLOW ANY HANDS NEAR THE SHUTTLE CRANK VALVE OR IN THE AGITATOR HOPPER WHILE THE MACHINE IS RUNNING.

PIPELINES

PIPELINES AND CLAMPS MUST BE OF SUFFICIENT SIZE FOR THE PUMP’S CAPACITY.

The pipeline connections must not be opened under working pressure. Before the pipeline is opened, pressure must be relieved by sucking back the concrete. Secure the couplings after the assembly of the pipeline.

When laying pipeline use as few bends as possible. Horizontal pipelines must be adequately supported. When installing a vertical pipeline, the best method is to use upright struts that can be anchored to the building.

It is preferable to install pipelines within the building whenever possible. See Operator’s Manual and “Pumping Concrete” booklets for more information on pipeline installations.

CAUTION:

material could cause the lines to whip or move in such a manner that it could cause injury to anyone working near the hosses or lines.

If the hoses or lines are blocked for any reason, or if the lines are kinked when starting up or during the pumping cycle, the pump pressure could straighten out the kink or force out the blockage. This rapid surge of

When moving hoses from one site application to another, it is

WARNING! DANGER OFWARNING! DANGER OF

WARNING! DANGER OF

WARNING! DANGER OFWARNING! DANGER OF AMPUTAMPUT

AMPUT

AMPUTAMPUT

Never place your hands or any part of your body in the hopper or allow anyone else to do so while the engine is running or when there is accumulator hydraulic pressure or series injury could result.

Refer to Operation section of this manual for more details.

TION!TION!

TION!

TION!TION!

important to walk the entire system and visually inspect for any kinks or sharp bends in the hose. You must and straighten them before starting or resuming the pumping operation.

Inspect the lines at all times to prevent the above conditions.

MAINTENANCE AND REPAIR

MAKE SURE THAT THE ACCUMULATOR PRESSURE GAUGE READS ZERO BEFORE ALLOWING ANYBODY TO PUT THEIR HANDS INTO HOPPER OR SHUTTLE AREA.

Refer to maintenance section of this manual for more details.

TURN OFF THE ENGINE AND DISCONNECT THE BATTERY CABLES BEFORE PERFORMING ANY MAINTENANCE OR REPAIRS.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 9

ST-70 — SAFETY INSTRUCTIONS

MODEL ST-70

THE OPERATOR IS IN COMPLETE CHARGE OF THE PUMP AND DELIVERY SYSTEM AND IS RESPONSIBLE FOR HIS/ HER OWN SAFETY AND TO WARN AND KEEP ALL OTHERS OUT OF DANGER.

Do not attempt to operate this equipment without a thorough understanding of this Parts and Operation Manual:

1. To prevent damage to equipment or injury to personnel, the following instruction must be followed carefully:

A. A copy of this manual and all others shall accompany the

pump at all times.

B. This equipment shall be operated only by experienced

operators or students under the direct supervision of an experienced operator.

C. No unauthorized persons shall be permitted to assist or

remain in the vicinity of the unit while it is in operation, or during the, inspection, cleaning or repair for the make-ready operation.

O. Never fill the fuel tank while the engine is running or hot.

Avoid the possibility of spilled fuel which may cause a fire.

P. Always carry a fire extinguisher of adequate size and a

first aid kit.

Q. Always wear a safety helmet and safety glasses when on

a job site pumping.

R. Always have the hopper grate securely in place when

pumping.

S. Pump in reverse when the shuttle valve or delivery system

is plugged.

T. Guards, grates, covers, etc. MUST NOT be removed or

altered.

U. If a failure or malfunction occurs, stop the pump and make

all necessary repairs immediately.

V. Electrical and manual controls must always be in working

order. W. NEVER stand on the hopper grate. X. Always position the pump on safe, solid, level ground, using

the jack stands.

D. This equipment shall not be towed or operated by individuals

who cannot read and understand the signs, decals or operating instructions.

E. This equipment shall not be operated by individuals under

the influence of alcohol or drugs.

F. Before towing, check the hitch and secure the breakaway

cable and safety chain to the towing vehicle.

G. Tow only with a vehicle and hitch rated to pull a 5000 lb.

load.

H. Use only a 2" one-piece, all-steel machined or forged ball

rated for a minimum of 5000 lbs.

I. Before start-up, check the hopper and remove all

obstructions.

J. Keep hands, feet and human body parts out of the hopper

when the engine is running.

K. The engine must be turned off before performing any

service operations. The engine is remote controlled and

may start pumping any time the engine is running. L. Do not use worn hoses or hose couplings – inspect daily. M. Replace any worn or damaged hoses, or couplings,

immediately. N. Do not disconnect the hose couplings or nozzles while

under pressure.

PAGE 10 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

IMPORTANT HAND SIGNALS

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 11

ST-70 — GENERAL INFORMATION

CONCRETE MIX DESIGN

Mix design is most important to achieve maximum pumpability. Pumpability is affected by, among other factors, the type and gradation of aggregate used. Natural aggregates make a more workable mix and pump more readily than crushed aggregates. A blend of natural and crushed aggregates will produce a workable mix. The type and gradation of aggregates is equally important for workability as the size and percentage of coarse aggregates in the mix.

The term “aggregates” describes all of the solid materials, from the largest rock to the smallest grain of sand, contained in the concrete mix.

Concrete mixes with a consistency as dry as one-inch slump and as wet as ten-inch slump have been pumped; but for maximum efficiency from the pump, a slump ranging from two to six inches will produce a more workable mix than one that contains more or less water.

A slump rating should be used with discretion; it is not always a real indication of the pumpability of the mix. The concrete may be workable in the sense that it will readily flow into place, but the same mix may not respond to pressure. Overly wet mixes tend to separate. In addition to affecting the strength and quality of the concrete, the delivery system will not tolerate separation. Overly dry mixes are similarly unsatisfactory if they lack plasticity and tend to be crumbly. To be properly pumped, the mix must be able to continuously coat the inside of the line with a lubricating seal of mortar.

The principle of concrete pumping is based on self-lubrication. As it moves through the transfer line, the concrete takes the shape of a plastic cylinder. It is forced through the transfer line on a film of mortar that is self-troweled to the service of the transfer line around its full periphery by the slug of concrete itself.

There are four ways in which this seal can be lost:

1. By pumping excessively wet mixes which do not have enough cohesion to hold together.

2. By pumping harsh undersanded concrete with poorly graded aggregates which can jam together when the pressure becomes too great for the insufficient amount of sand to hold the aggregates apart.

3. By getting a rock pocket, such as mixer tailings, into the pump valve. This rock pocket will have an insufficient coating of mortar and the mix will not be plastic enough to allow the valve to operate or the mix to move in the line.

4. Through excessive bleeding. If the mix is short or fines, but the sand is otherwise fairly well graded, bleeding will not normally create any problems as long as the pump continues operation. But, if the pump is shut down, bleeding can result in a loss of lubrication and blocked erratic flow.

The above are bad concrete practices, regardless of how the mix is to be placed. But, these points do show that special mixes are not always needed, within limits, for pumping concrete. Good aggregate gradation is most important to pump concrete the maximum distance.

The use of admixtures can have a beneficial effect on pumpability. Most of the dispersing agents will fatten, retard bleeding, and increase workability. Thus, the average concrete can be pumped for appreciably longer distances. Air entraining agents will also improve workability, although they cannot be used as a substitute for good gradation of the aggregate. Pumping will not appreciably affect the final air content of the mix. High-early cement tends to give a more readily pumpable mix with superior water retaining qualities. However, if delays are likely to occur, extra care must be exercised due to the faster setting time over regular cement.

The Mayco Model ST-70 will pump a wide variety of concrete pump mixes. But, there are guidelines that must be followed. Use this information in conjunction with “The Delivery System” on page 32, Sections 18 thru 18.10.

PAGE 12 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — GENERAL INFORMATION

REGIONAL DIFFERENCES

Concrete is made by mixing locally available rock and sand with cement and water. For this reason there are great differences in the pumpability of concrete from one region of the country to another.

It is impossible to define a specific mix for each region that the Model ST-70 be will working in. Therefore, the mixes on pages 14 through 17 will provide a basic guideline for establishing the proper mix design for your area.

Use this information to specify your requirements to your local ready-mix batch plant, contractor and civil engineer. It may take minor adjustments to make a mix pumpable, so you should explain your needs.

The elements that have to be controlled and consistently maintained by the batch plant are:

1. The sizing and mix percentage of rocks, gap graded from the largest down through the smallest sizes.

2. Sand with a sieve analysis that has the proper percentage of fines, ASTM C33 spec.

In addition, the Mayco Structural Concrete ST-70 Pump can be used to pump a large aggregate hard rock as follows:

1. Pea rock (1/2" minus) pump with mixes being as low as 30% rock and 70% sand. (See page 30, for comments on cleaning the pump.)

2. Shortening pea rock when used with an air compressor and nozzle. (See back pages for recommended set-up.)

3. “Mud Jacking”, high pressure grouting.

3. Sufficient cement to produce the required design strength of the concrete and provide the lubricating binder to pump the concrete through the delivery system.

Use a minimum of:

500 lbs. of cement/cu yd for 2500 p.s.i. concrete after 28 days.

530 lbs. of cement/cu yd for 3000 p.s.i. concrete after 28 days.

600 lbs. of cement/cu yd for 4000 p.s.i. concrete after 28 days.

4. Admixture pump-aid if necessary.

5. The proper amount of water to make a workable slump and plasticize the mix.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 13

ST-70 — CONCRETE MIX INFORMATION

Job Identification* _______________________________________ Date* ______________________________________

Architect* ______________________________________________ General Contractor* ___________________________

Structural Engineer* ______________________________________ Concrete by* ________________________________

THE PROPORTIONS SHOWN HERE ARE A RECOMMENDATION BASED ON TESTS OF SAMPLES RECEIVED BY THE LABORATORY. TESTS PERFORMED BY SUPPLIERS OR MANUFACTURERS OR ON PRIOR KNOWLEDGE OF THE MATERIALS INVOLVED AND IS LIMITED TO INFORMATION DERIVED FROM THESE SAMPLES TESTS BY OTHERS OR TO THAT PRIOR KNOWLEDGE.

IT IS UNDERSTOOD THAT THE CHEMICAL AND/OR PHYSICAL CHARACTERISTICS OF THESE MATERIALS ARE SUBJECT TO VARIATIONS THAT MAY ADVERSELY AFFECT THE FINISHED PRODUCT AND THAT THIS MIX DESIGN IS NOT TO BE USED EXCEPT AT THE USERS OWN RISK UNLESS THESE VARIATIONS ARE DETERMINED AND COMPENSATED FOR IN A MANNER APPROVED BY THE LABORATORY IN WRITING.

Specifications requirements: 2500 P.S.I. in 28 DAYS 3" SLUMP PUMP MIX 4" DIA LINE

SIEVE ANALYSIS PER CENT PASSING U.S. STANDARD SIEVE

MATERIAL ......... 1 1/2............ 1 ...............3/4 ..................................................................................................................

FAI WCS ....................................................................... 100 ........ 97............ 84 ........... 70 ....... 45 ........ 25 ..... 10 ....... 97.5

FA2 ...................................................................................................................................................................................

CA1 #4-3/8" .............................................. 100 ............. 95 .......... 13 ............ 3 ............................................................... 90.5

CA2 #3-1 ................................ 100 ...........96 ............... 61 .......... 6.............. 1 ............................................................... 91.0

CA3 ..................................................................................................................................................................................

............................................... 100 ........... 98 ............... 85 ..........50 ............ 40 ........... 33 ....... 21 ........12 ..... 4 .........

Source of Coarse & Fine Aggregates -* Cement – Type* Mix No*

Cement Sks/Cu. Yd. ................................................................ 5.3

Cement – Lbs. ........................................................................ 500

Sand, Lbs. W.C.S. ................................................................... 1550

No. 4 Gravel (3/8"), Lbs. .......................................................... 500

No. 3 Gravel (1"), Lbs. ............................................................. 1220

No. 2 Gravel (1-1/2"), Lbs. .......................................................

Water, Lbs............................................................................... 290

Total Weight ........................................................................... 4060

Water, gal. per yd. ................................................................... 34.8

Water, gal./Sk. per yd. ............................................................. 6.5

Slump, calculated ................................................................... 3"

Admixture ............................................................................... 3 fl. oz. POZZOLITH 300N/100 * OF CEMENT

Max. Water Allowable ............................................................. *

* THIS INFORMATION PROVIDED BY ENGINEER OR BATCH PLANT THE ABOVE MIX DESIGN IS TYPICAL OF A PUMPABLE MIX. TO BE USED AS A GUIDELINE ONLY. REFER TO LOCAL

AGENCY FOR JOB SPECIFICATION.

3-5

PAGE 14 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — CONCRETE MIX INFORMATION

Job Identification* _______________________________________ Date* ______________________________________

Architect* ______________________________________________ General Contractor* ___________________________

Structural Engineer* _____________________________________ Concrete by* ________________________________

Specifications requirements: 3000 P.S.I. in 28 DAYS 4" SLUMP PUMP MIX 4" DIA LINE

SIEVE ANALYSIS PER CENT PASSING U.S. STANDARD SIEVE

MATERIAL ......... 1 1/2............ 1 ...............3/4 ..................................................................................................................

FAI WCS ....................................................................... 100 ........ 98............ 86 ........... 70 ....... 48 ........ 24 ..... 8 ......... 97.5

FA2 ...................................................................................................................................................................................

CA1 #4-3/8" .............................................. 100 ............. 94 .......... 16 ............ 4 ............................................................... 90.5

CA2 #3-1 ................................ 100 ...........93 ............... 57 .......... 6.............. 1 ............................................................... 91.0

CA3 ..................................................................................................................................................................................

............................................... 100 ........... 97 ............... 83 ..........51 ............ 41 ........... 33 ....... 23 ........11 ..... 4 .........

Source of Coarse & Fine Aggregates -* Cement – Type* Mix No*

Cement Sks/Cu. Yd. ................................................................ 5.

Cement – Lbs. ........................................................................ 525

Sand, Lbs. W.C.S. ................................................................... 1520

No. 4 Gravel (3/8"), Lbs. .......................................................... 480

No. 3 Gravel (1"), Lbs. ............................................................. 1230

No. 2 Gravel (1-1/2"), Lbs. .......................................................

Water, Lbs............................................................................... 295

Total Weight .................................................................... 4050

Water, gal. per yd. ................................................................... 35.4

Water, gal./Sk. per yd. ............................................................. 6.3

Slump, calculated ................................................................... 4"

Admixture ............................................................................... 3 fl. oz. POZZOLITH 300N/100 * OF CEMENT

Max. Water Allowable ............................................................. *

* THIS INFORMATION PROVIDED BY ENGINEER OR BATCH PLANT THE ABOVE MIX DESIGN IS TYPICAL OF A PUMPABLE MIX. TO BE USED AS A GUIDELINE ONLY. REFER TO LOCAL

AGENCY FOR JOB SPECIFICATION.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 15

ST-70 — CONCRETE MIX INFORMATION

Job Identification* _______________________________________ Date* ______________________________________

Architect* ______________________________________________ General Contractor* ___________________________

Structural Engineer* _____________________________________ Concrete by* ________________________________

Specifications requirements: 4000 P.S.I. in 28 DAYS 4" SLUMP PUMP MIX 5" DIA LINE

SIEVE ANALYSIS PER CENT PASSING U.S. STANDARD SIEVE

MATERIAL ......... 1 1/2............ 1 ...............3/4 ..................................................................................................................

FAI WCS ....................................................................... 100 ........ 97............ 84 ........... 56 ....... 36 ........ 22 ..... 8 ......... 97.5

FA2 ...................................................................................................................................................................................

CA1 #4-3/8" .............................................. 100 ............. 95 .......... 13 ............ 3 ............................................................... 90.5

CA2 #3-1 ................................ 100 ...........95 ............... 64 .......... 8.............. 1 ............................................................... 91.0

CA3 ................... 100 ............. 93 ............. 64 ............... 18 .......... 2 ................................................................................. 90.0

.......................... 100 ............. 98 ............. 90 ............... 73 .......... 49 ............ 40 ........... 26 ....... 17 ........ 10 ..... 4 .........

Source of Coarse & Fine Aggregates -* Cement – Type* Mix No*

Cement Sks/Cu. Yd. ................................................................ 6.4

Cement – Lbs. ........................................................................ 600

Sand, Lbs. W.C.S. ................................................................... 1480

No. 4 Gravel (3/8"), Lbs. .......................................................... 400

No. 3 Gravel (1"), Lbs. ............................................................. 470

No. 2 Gravel (1-1/2"), Lbs. ....................................................... 800

Water, Lbs............................................................................... 300

Total Weight .................................................................... 4050

Water, gal. per yd. ................................................................... 36

Water, gal./Sk. per yd. ............................................................. 5.6

Slump, calculated ................................................................... 4"

Admixture ............................................................................... 3 fl. oz. POZZOLITH 300N/100 * OF CEMENT

Max. Water Allowable ............................................................. *

* THIS INFORMATION PROVIDED BY ENGINEER OR BATCH PLANT THE ABOVE MIX DESIGN IS TYPICAL OF A PUMPABLE MIX. TO BE USED AS A GUIDELINE ONLY. REFER TO LOCAL

AGENCY FOR JOB SPECIFICATION.

PAGE 16 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — CONCRETE MIX INFORMATION

DNASETERCNOC—SISYLANAEVEIS

EZISEVEIS

4# 001-59 89 2 2

8 001-08 98 11 9

61 58-05 17 92 81

03 06-52 74 35 42

05 03-01 32 77 42

001 01-2 7 39 61

002

33CMTSA

SCEPS

The sand content of pumpable concrete is very important. It is one of the two major ingredients that change due to regional location (the other is the rock or gravel).

Above is a typical sieve analysis of washed concrete sand (W.C.S.) to A.S.T.M. C33 specifications.

SSAP%

MUCCA

56.2=.M.FsuludoMsseneniF 56.2

1#ELPMAS

%VIDNI

TER

The total of the “Accumulated % Retained” is the Fineness Modulus (F.M.). The ideal F.M. is between 2.50 and 2.75, but the correct F.M. does not guarantee pumpability. Besides having a correct F.M. the percentage of sand by weight that passes through the No. 50 sieve must be between 15 and 30 and through the No. 100 sieve 5 and 10. The total of #50 and 100 mesh particles must be between 25 and 35 percent.

This fine material plus the cement will provide the necessary film of lubrication to move the concrete inside the delivery system.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 17

1. To obtain a representative sample, take samples at three or more regular intervals throughout the discharge of the mixer or truck. DO NOT take samples at the beginning or end of the discharge.

2. Dampen the inside of the cone and place it on a smooth, moist, nonabsorbent, level surface large enough to accommodate both the slumped concrete and the slump cone. Stand on the “foot pieces” throughout the test procedure to hold the cone firmly in place.

!/3

3. Fill the cone dia x 24" lg. bullet-pointed steel rod. (This is a specific requirement which will produce non-standard results unless followed exactly.) Distribute rodding evenly over the entire cross section of the sample. (See figure A.)

4. Fill cone another volume. Rod this second layer 25 times with the rod penetrating into, but not through, the first layer. Distribute rodding evenly over the entire cross section of the layer. (See figure B.)

5. Fill cone to overflowing. Rod this layer 25 times with rod penetrating into but not through, the second layer. Distribute rodding evenly over the entire cross section of this layer. (See figure C.)

full by volume and rod 25 times with a 1/2"

!/3

which will make the cone

@/3

full by

SLUMP TEST PROCEDURE

6. Remove the excess concrete from the top of the cone, using the tamping rod as a screed. (See figure D.)

7. Lift the cone vertically with a slow even motion. Do not jar the concrete or tilt the cone during this process. (See figure E.) Invert the withdrawn cone, and place it next to, but not touching the slumped concrete.

8. Lay a straight edge across the top of the slumped cone. Measure the amount of slump in inches from the bottom of the straight edge to the top of the slumped concrete at a point over the original center of the base (See Figure F). The slump operation must be complete in a maximum elapsed time of 1½ minutes. Discard the concrete. DO NOT use it in any other tests.

PAGE 18 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

The following is a brief explanation of how the concrete cylinders, hydraulic cylinders, shuttle tube, valves and hopper work in sequence to pump concrete.

The hydraulic pressure is generated by a variable volume, pressure compensated, axial piston pump that is driven by a diesel engine. The hydraulic pressure is applied to one of the two hydraulic cylinders causing the hydraulic piston, which is connected to the concrete piston, to discharge concrete into the delivery line. The rod sides of the drive cylinders are hydraulically connected together creating a “slave circuit.” As one cylinder is discharging concrete, the hydraulic oil from the rod side of the drive cylinders is being transferred through the slave circuit causing the opposite cylinder to move back on the suction stroke filling the cylinder with concrete. This operation is made possible by the shuttle tube located in the hopper and is sequenced to operate in conjunction with the cycling of the drive cylinders.

TO TANK

ST-70 — OPERATION (How it Works)

HIGH PRESSURE OIL FROM PUMP

PROXIMITY

SWITCH

HYDRAULIC

CYLINDERS

SLAVE

PROXIMITY SWITCH

OIL

PISTON

CUP

CONCRETE

CYLINDERS

SHUTTLE TUBE

SLAVE

OIL

TO TANK

The ST-70 cycling sequence is initiated by an electrical signal generated by two proximity switches located in the drive cylinder. The proximity switches are normally open, magnetically sensing the movement of the main drive cylinder. As the drive cylinder piston head passes the proximity switch, an electrical signal is sent to the solenoid operated pilot valve which in turn directs pilot oil to the four valves controlling the drive cylinder and the shuttle cylinder.

A one-gallon accumulator assists the movement of the shuttle tube. This circuit assures that the shuttle tube will throw with the same intensity of each stroke regardless of how fast the main drive cylinders are cycling.

Figure 1

CYLINDER A — INTAKE STROKE

CYLINDER B — DISCHARGE STROKE

Figure 2

CYLINDER A — DISCHARGE STROKE

CYLINDER B — INTAKE STROKE

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 19

INITIAL START-UP PROCEDURE

This section is intended to assist the operator with the initial start-up of the MAYCO ST-70 Concrete Pump. It is extremely important that this section be read carefully before attempting to use the pump in the field.

DO NOT proceed to the Operating Procedures (field use) of this manual until this section is thoroughly understood.

NOTE:

Failure to understand the operation of the MAYCO ST-70 Concrete pump could result in severe damage to the pump or personal injury.

Figure 1 illustrates the basic operating controls and indicators on the MAYCO ST-70 Concrete pump. Each of the items referenced will be discussed. The sequence will be as follows:

1. Engine Oil

2. Hydraulic Oil

3. Fuel

4. Rear Stabilizer Stands

5. Emergency Stop Switch

6. Ignition Switch

7. Status Indicators

8. Control Switch, Engine Throttle Control

9. Volume Control

10. Engine Speed, Cooling Fan

11. Pressure Test

12. Hopper Remixer Control Lever

13. Manual and Radio Control

14. Cylinder Lubrication

Figure 1. MAYCO ST–70 Controls and Indicators

PAGE 20 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

INITIAL START-UP PROCEDURE

COTTER PIN

BOLT EYE

REAR STABILIZER STAND

HANDLE TEE BOLT

STABILIZER FOOT PAD

Engine Oil

1. Pull the engine oil dipstick from the engine side panel as

shown in Figure 2.

If the hydraulic oil level is low, remove the cap just above the oil level sight glass and add the correct amount of hydraulic oil to bring the hydraulic oil level to a normal safe operating level. (Use Shell oil Tellus 68 or Mobil oil

ENGINE SIDE PANEL

DFE26)

FUEL

3. Determine if engine fuel is low (Figure 5). If fuel level is low, remove the fuel filler cap and fill with diesel fuel.

THROTTLE CABLE

SOLENOID

RED (POSITIVE)

WHITE (NEGATIVE

OIL DIPSTICK

OIL FILTER

Figure 2.

Engine Oil

Determine if engine oil is low. If oil level is low, add correct amount of engine oil to bring oil level to a normal safe operating level. See Figure 3.

REAR STABILIZER STAND

Figure 5.

Fuel Sight Tube

To reduce excessive vibration and rocking of the ST-70 Concrete Pump set the rear stabilizer as follows:

OIL DIPSTICK

ADD ENGINE OIL

SAFE OPERATING OIL LEVEL

MAX

MIN

Figure 3.

4. Locate both left and right rear stabilizer stands (Figure 6).

Engine Oil Dipstick

Hydraulic Oil

2. Determine if the hydraulic oil level is low by observing the level of the oil in the Hydraulic Oil Sight Glass (Figure 4).

NORMAL LEVEL

L O W

150

100

250

150

HYDRAULIC OIL LEVEL SIGHT GLASS

LOW LEVEL ADD OIL

HYDRAULIC OIL TEMPERATURE GAUGE

Figure 4.

A. Remove the

then

B. Position both rear stabilizers stands on firm (not loose)

ground.

C. Align the hole on the stabilizer stand with the hole on the

frame body and

Hydraulic Oil Sight Glass

Figure 6.

Rear Stabilizer Stand

cotter pin

pull

the handle tee to release the stabilizer stand.

from the handle tee bolt eye, and

level

insert

handle tee bolt.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 21

INITIAL START-UP PROCEDURE

D. Insert the cotter pin into handle tee bolt eye to lock the

stabilizer stand.

Emergency Stop Switch

5. Locate the Emergency Stop Switch (Figure 7) on the Hydraulic Pump Control Box. Use this switch in the event of a emergency.

7. Observe that the Air Filter and Oil Pressure status indicator lights are ON (Figure 9). The Battery status indicator light should be OFF

A. Turn the key to the

to start.

B. In warm weather let engine warm-up for 5 minutes. In cold

weather let engine warm-up for 10 minutes.

Emergency Stop

Figure 7.

Switch

C. The Air Filter, Oil Pressure and Battery indicator lights

(Figure 9) should

AIR FILTER

Turn the Emergency Stop switch counter-clockwise (open). This will allow the engine to start.

NOTE:

If the Emergency Stop switch is in the closed position (stop), engine will not start. To start the engine, make sure the Emergency Stop switch is in the open position (fully extended).

NOTE:

If any of the status indicator lights referenced in the ignition section (step 4) are ON, turn off the engine. DO NOT continue to run the engine.

Ignition Switch

NOTE:

Place all switches on the Hydraulic Control Box in the vertical position (up).

6. To start the engine, insert the key (Figure 8) into the ignition

Control Switch

8. Turn the Control Off switch (Figure 10) to the ON position,

thumping

a thumping sound represents the number of strokes per minute (volume) of the pump.

switch and turn the key to the ON position.

IGNITION

CONTROL

OFF

REMOTE

START

position and listen for the engine

all be off.

OIL

PRESSURE

Status indicator Lights

BATTERY

Figure 9.

sound (cylinder stroke) should be heard. The

OFF

START

Figure 8.

Ignition Switch

Control Off Switch

PAGE 22 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

Figure 10.

0 0

THROTTLE CONTROL

TURN CLOCKWISE TO INCREASE ENGINE SPEED

TURN COUNTER CLOCKWISE TO DECREASE ENGINE SPEED

INITIAL START-UP PROCEDURE

9. Turn the Volume Control (Figure 11),

lock nut

counterclockwise (CCW) to release the volume control knob.

VOLUME CONTROL

LOCK NUT

VOLUME CONTROL

CCW

DECREASEINCREASE

Figure 11.

Volume Control

A. Use the volume control, to set the pump volume to

approximately 10 strokes per minute. Turning the volume control clockwise (CW) will counterclockwise (CCW) will

decrease

increase pump

pump volume, and

volume.

NOTE:

RPM X 100

TACH

HOURS

3010

Figure 13.

Engine Tachometer

Use a wristwatch or stop watch to determine the number of pump strokes within 1 minute.

B. Let the pump cycle until the hydraulic oil temperature

C. While monitoring the tachometer, (Figure 13) turn the

(Figure 12) is approximately 50 to 60 degrees fahrenheit.

D. Turn the Control Off switch (Figure 10) to the OFF position.

Engine Speed

150

200

100

10. Turn the Operation Pump/Engine switch to the

NOTE: The pump should not be cycling at this time. Only the ENGINE

250

150

should be running.

Figure 12. Hydraulic Oil

Temperature Gauge

engine Throttle Control (Figure 14) until the engine speed reaches 1500 RPM.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 23

Figure 14.

Engine Throttle Control

engine

position (Figure 15).

OPERATION

PUMP

ENGINE

Figure 15. Operation

Pump/Engine Switch

INITIAL START-UP PROCEDURE

A. While monitoring the tachometer, (Figure 13) turn the

engine Throttle Control (Figure 14) clockwise until the engine speed reaches 2550 RPM (maximum speed).

B. The Accumulator Pressure Gauge (Figure 16) should read

approximately 1750 pounds per square inch (psi).

Turn the Fan switch to the OFF position and listen for fan to stop. If machine exceeds 170°F, and to cool the machine down, turn operation switch to (Fig. 15) engine position. Run engine at high RPM with cooling fan on for 10 to 15 minutes.

NOTE: Do not stroke cylinders. The operator may also spray the hydraulic tank and components with water.

PRESSURE TEST

12. The Pressure Test switch (Figure 18) is a self-diagnostic test switch, that when activated will test the pressure of the system. This switch will be discussed in the maintenance

500

1500

LHA

2000

2500

3000

and troubleshooting section of this manual.

ACCUMULATOR PRESSURE GAUGE

0-3000 PSI

Figure 16. Accumulator

Pressure Gauge

11. COOLING FAN

CAUTION If the hydraulic oil temperature exceeds 170 degrees fahrenheit,

shut down the pump. DO NOT continue to operate the pump.

Failure to shut down the pump will result in severe damage to the pump.

This section is intended to make sure the Fan is working properly. Under normal conditions the Fan should be turned on when the hydraulic oil temperature begins to approach between 75 degrees fahrenheit.

Make sure the Operation Pump/Engine switch is in the

engine

position (Figure 15), and that only the engine is running. Turn the Fan switch (Figure 17) to the ON position and listen for

13. HOPPER REMIXER CONTROL

A. Located to the left of the Hydraulic Temperature gauge is

the Hopper Remixer Control lever (Figure 19).

B. Turn the Operation Pump/Engine switch to the engine

position (only the engine should be running).

fan to start.

PRESS TEST

OFF

Figure 18.

Pressure Test On/Off Switch

PUSH UP TO REVERSE BLADE ROTATION (CCW)

FAN OFF

PUSH DOWN

Figure 17.

TO OPERATE (CW BLADE ROTATION)

Hopper Remixer

Control Lever

Fan On/Off Switch

PAGE 24 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

Figure 19.

INITIAL START-UP PROCEDURE

OFF

A B

HANDHELD

REMOTE CONTROL TRANSMITTER

REMOTE CONTROL RECEIVER

ANTENNA INPUT

CONTROL SWITCHES

MOUNT ON MAYCO ST-45 FRAME

BODY

SIGNAL CABLE

HAND HELD REMOTE

UNIT

CONTROL SWITCHES

25 FT. CABLE

C. Push the Hopper Remixer Control lever

downward

(Figure

19) and observe that the blades (Figure 20) inside the hopper are turning in a clockwise direction (forward).

BLADES

CONTROL SWITCHES

FORWARD

REVERSE

(CCW)

SHAFT ROTATION

(CW)

Figure 20.

Hopper Remixer

15. CYLINDER LUBRICATION BOX

Blades (Rotation)

D. Push the Hopper Remixer Control lever

upward

(Figure

18) and observe that the blades (Figure 20) inside the hopper are turning in a counter-clockwise direction (reverse).

everyday prior to pumping. The oil level should be maintained at a height of 5 inches or about ´½ the concrete cylinder height.

14. OPTIONAL RADIO REMOTE CONTROL

The MAYCO ST-70 Concrete Pump has a remote control feature that allows the pump to be remotely controlled. If desired, the pump can be operated via a receiver/transmitter method (Figure

21) or a hardwire method, which utilizes a 25-ft. extension cable. The manual remote cord (Figure 22) should be installed under the main control box. Contact your MAYCO representative for further information.

Important Notice! During freezing temperature after pumping, completely drain the water box and cover the hopper. Frozen liquid will restrict the piston travel and cause severe damage to the pump.

CONTROL SWITCHES

MOUNT ON MAYCO ST-45 FRAME BODY

engine and stroke the cylinder (keep hands out of box) ten to fifteen times. While stroking, spray water inside of the box to thoroughly clean out all contamination. When the box is clean, replace drain plug, add new lubrication and install the top cover.

REMTRON

REMOTE CONTROL TRANSMITTER

REMOTE CONTROL RECEIVER

REMTRON

Any questions regarding the above mentioned procedure, please call the Mayco Service Department: 1-800-30-MAYCO.

HAND HELD REMOTE UNIT

25 FT. CABLE

Figure 22.

Handheld Remote Cable Unit

WARNING

Before checking lubricaton level, stop the engine and remove the engine starter key. We recommend using soluble type oil (water & oil mixture). The oil level should be checked

SIGNAL

ANTENNA INPUT

CABLE

Figure 21.

Handheld Receiver/

Transmitter

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 25

ST-70 — OPERATING PROCEDURES

Important Rules for the Setup and Operation of

Mayco Model ST-70 Hydraulic Concrete Pump

1. The Mayco pump must be operated by experienced operators, who are qualified with the particular model being used, or students under the direct supervision of an experienced operator. The operator is in complete charge of the pump and delivery system. Know and warn all others of the DANGERS that are present when using, maintaining or being around this pump and delivery system. KNOW YOUR MACHINE!

2. The operator must become familiar with the controls and gauges by a careful study of the owners manual.

3. The operator must become aware and understand the danger involved in the operation and maintenance of the pump.

4. The operator must know the limitation of the pump described in this manual.

5. The concrete pump is capable of developing high pressures on the concrete. Proper care must be used in the maintenance of pipes and hoses and hose couplings for safe operation.

6. Only experienced operators, or students under the direct supervision of an experienced operator shall perform any maintenance, cleaning, repair or setup operations.

7. Unauthorized persons must not be permitted to assist or remain in the immediate vicinity of the unit while it is in operation.

8. The Mayco pump must not be operated by individuals who cannot read and understand the owners manual in the language in which it is printed.

9. The Mayco pump must not be operated by anyone under the age of 18 years.

10. The Mayco pump must not be operated by anyone under the influence of alcohol or drugs.

11. Locate the pump in an area as level as possible, where two or more ready-mix trucks will have access to the hopper.

12. Begin pumping by placing the hoses or pipe at the farthest point of discharge.

13. Concrete will flow with less back pressure through pipe than through hose. Bends in hose or pipe will also require more pressure. The operator should take these facts into consideration when laying out the system.

14. Vertical and down-hill pumping are more difficult than horizontal pumping. Vertical pumping requires higher pumping pressure. Down-hill pumping can cause separation of the concrete, which can cause a blockage. Back pressure must be kept in the line at all times during down-hill pumping.

15. When the pump is parked in the street, position it so that the control panel (right side) is closest to the curb. – ALWAYS THINK SAFETY!

16. Lower and lock the rear jackstands in place before any concrete is discharged into the hopper.

17. THE DELIVERY SYSTEM To successfully pump concrete it is critical to use the correct

size and type of delivery system. The rules that govern the size of the delivery system apply

to all concrete pumps, not just Mayco pumps.

The inside diameter of the hose and pipe must be three to four (3 to 4) times the size of the largest aggregate in the mix that is to be pumped.

The rock size and percentage shown is of the total rock content in the mix. The balance of the rock must be properly blended down through all of the smaller sizes.

The same applies to the sand portion of the mix. Consult the ready-mix company and ensure that they are willing

and able to deliver properly blended aggregates in their concrete. 3" inside diameter is the smallest system of hose, pipe and elbows that is recommended for pumping “Hard Rock”, large aggregate concrete.

Remember – The larger the size of the delivery system, the less pressure required to move the concrete.

Use this information in conjunction with “Concrete Mix Design” on pages 12 thru 17.

Example: 1-1/2" rock (8 to 10% max. content by weight) requires

a 5" dia. concrete delivery system. 1" rock (10 to 15% max. content by weight) requires a

4" dia. concrete delivery system. ¾" and under rock (10 to 15% max. content by weight)

requires a 3" dia. concrete delivery system.

PAGE 26 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — OPERATING PROCEDURES

18 Priming the Pump and Delivery System with Slurry.

It is CRITICAL to the successful operation of a concrete pump that the manifold and all delivery hose, pipe and elbows are coated with a film of lubrication BEFORE you attempt to pump concrete. Failure to properly prepare the pump and system will result in a “dry pack” of concrete, blocking the shuttle valve tube or delivery line.

18.1 With the entire delivery system connected to the pump. Except for the first hose. Pour 5 gallons of water into the second hose and push in your clean out ball and reconnect. This will help hold back the prime.

18.2 What you can use to mix the prime: There are several things you can use for the prime. Here

are a few. Cement and lime at a 50/50 mixture, slick pac, bentonite clay.

NOTE: The bentonite is not compatible with concrete. Do not pump it into the forms discharge it out of the formed area.

Mix the prime to the consistency of a smooth batter.

18.4 Position the first ready-mix truck at the hopper. Check the concrete. Do not discharge concrete into hopper at this time.

18.5 Pour the prime into the first hose and connect it to the pump.

NOTE: You should use two 5 gallon buckets of prime.

19. Waiting for concrete trucks to arrive: If there are delays:

19.1 Stop the pump with a full hopper.

19.2 Run the remixer, alternating forward and reverse,

19.3 Add water to stiff mixes, if necessary.

19.4 If shutdown period exceeds 3 to 4 minutes, turn off engine

19.5 Start the engine, cycle the pump slowly 1 or 2 strokes

19.6 If shutdown period reaches 1 hour (or less, depending

to push through blockages due to separation of material in the hose or manifold, you will soon have breakdowns and costly repairs which are not covered under the warranty. If a blockage exists, find where it is and clear it before further pumping. Do not use extra horse power, it will only make it worse.

whenever the engine is running.

to prevent vibration from separating the mix in the hopper. Separation will cause a blockage in the manifold when pumping is resumed.

and run remixer every 10 minutes.

on the age and temperature of the concrete), pump out and clean the delivery system and pump. (See page 24 for clean up procedures.)

WARNING: Common sense tells us that if you drive a truck into a “brick wall,” something is going to be damaged. The same holds true with your concrete pump. If you repeatedly pull the throttle all the way out and force your pump

18.6 With the pump in FORWARD at 25-30 strokes per minute, slowly discharge the concrete from the ready-mix truck into the hopper and completely fill it. Keep the pump running continuously until concrete is discharging at the end of the delivery system. If the pump is stopped during this procedure, a blockage may occur (see page 22, Section 4).

18.7 If it is necessary to replace or add a section of delivery system, after the initial lubrication procedure, wet the inside area of the hose, pipe or elbow with 5 gallons of water per 25 foot length, before adding it to the system.

1. When pumping long distances or pumping stiff mixes, you

2. Leaking hose coupling gaskets (which leak water) cause

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 27

can expect a drop in volume, compared to shorter lines and wetter mixes due to higher pumping pressures and cavitation.

separation and subsequent jamming at that point.

ST-70 — OPERATING PROCEDURES

3. Damaged hoses with internal restrictions can cause blockages.

4. If a blockage occurs in the hose, STOP the pump, “walk the hose” until you find the point of trouble. (The hose will be soft immediately past the blockage.) Elevate the hose at that point with the blockage hanging down. Using a hammer, you can pound the down stream edge of the packed area until it free flows or shakes out of the hose. Pumping can now be resumed. If this method does not clear the pack FOLLOW THE INSTRUCTIONS IN Section 7, paragraph

7.1 thru 7.5 of this page.

5. “Down-hill pumping” can be difficult. When the pump is stopped, the material can flow slowly and cause the hose to collapse. When pumping is resumed, you can expect a blockage at the point of hose collapse. To prevent this, the hose can be “kinked off” at the discharge end when the pump is stopped, to stop gravity flow. The use of stiffer mixes when pumping down-hill will stop gravity flow.

6. When pumping vertically:

6.1 When pumping vertically up the side of a building, above 40 feet, we recommend the installation of steel pipe securely fastened at intervals as necessary to support the pipe. Ninety-degree, long-radius pipe sweeps should be installed at the top and bottom of the steel line. Use a 25 ft. hose, or short section, off the pump. For the balance of the horizontal distance to the vertical line, use pipe. This type of installation has been satisfactory on many jobs being pumped in excess of 100 feet high. Line pressures are always less using steel pipe as compared to hose.

6.2 When pumping vertically using all hose, it is recommended not to go higher than 50 feet with hose. The hose should be tied off at intervals of 10 feet, if possible. Special attention should be given when tying the hose off at the top as the hose will have a tendency to stretch when filled with concrete. This will increase the possibility of a blockage at the point where the hose is tied off. To avoid this, a long radius 90 degree elbow is recommended. The suggested place to tie off is under the clamp coupling that connects the hose to the 90 degree elbow.

Note: It is strongly recommended that pipe be used on all vertical pumping for safety and convenience. If it is absolutely necessary to use hose, then use section 6.2 as a guide.

7. The shuttle tube is plugged if volume at the discharge end of the hose stops, the hose is soft and the hydraulic oil pressure gauge reads 3000 psi or more.

To clear a plug in the shuttle tube, great care must be taken as a dangerous condition will exist from pressure build-up inside the shuttle tube. (With the shuttle valve, the concrete can be pumped in reverse.)

Follow these instructions carefully:

7.1 DO NOT open any of the delivery system joint clamps.

7.2 Switch the pump into “Reverse”: With pump speed at medium-slow (approx. 12 strokes per

min.) try to pull the “pack” back into the hopper with 5 or 6 reverse strokes, remix the concrete in the hopper.

Switch the pump into “Forward”. If it is still plugged, repeat “Reversing” procedure three

times. If concrete still does not move, see 7.3 and 7.4 below. The

last action MUST be “pumping in reverse” to relieve the pressure in the shuttle tube.

7.3 Stop the pump. Switch off the engine.

7.4 The senior or most experienced operator must warn all others to stand at least 20 feet away from the machine and turn their heads to face away from the pump.

The operator will position himself/herself beside the reducing elbow at the pump outlet, then, wearing safety glasses slip the end of a pry bar (24" length of reinforcing steel rod) under the latch of the hose clamp and flip it up.

Carefully knock the end of the hose away from the reducer. Chip the concrete out of the reducer with the pry bar. Remove the reducer. From the discharge end chip the concrete out of the shuttle

tube with the pry-bar. If concrete cannot be loosened from the outlet of the shuttle tube, then remove the clean-out plug on the bottom of the hopper, discharging the concrete.

Only the senior operator may then remove the inspection cover plate from the shuttle tube, by using a long extension wrench and the 24" pry bar. Make sure the accumulator pressure gauge reads zero prior to removing cover.

WARNING: NEVER PLACE YOUR HANDS OR ANY PART OF YOUR BODY IN THE HOPPER OR ALLOW ANYONE ELSE TO DO SO.

PAGE 28 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — OPERATING PROCEDURES

Chip the blockage out with the pry-bar. Flush the shuttle tube with water. Replace and seal the inspection cover plate on the shuttle

tube.

7.5 Resume pumping.

8. The effects of heat and excessive time on concrete: Hot concrete, commonly referred to as a “hot load”, is concrete that has been in a redi-mix truck in excess of 2 to 3 hours. On a hot day, the amount of time is even less. A brief explanation of why heat and time affect concrete: Concrete starts setting or drying up through a chemical reaction. The catalyst to this reaction is heat. When pumping a hot load, it is important to remember that when you have to stop pumping for any reason, add water to the concrete in the hopper and remix (see Page 27, Section 19). Move concrete in the hose every 5 minutes. If shutdown time becomes too long, wash out immediately (see Page 24).

9. ADMIXTURES: Admixtures are designed into the concrete mix by the redi-mix company or an architectural engineering company. This section lists common admixtures and a brief explanation of their function.

9.1 POZZOLITH 300 R or the equivalent. – Acts as a water retarder and a lubricant. On a lean mix, long pushes stiff mixes and vertical pushes, Pozzolith 300 R helps pumpability.

10. If the volume at end of hose starts to decrease gradually and eventually almost stops, it is quite likely that the wear ring and/or wear plate have to be replaced due to excessive wear allowing the concrete to be discharged back into the hopper under pressure. This is a major reason for plugging in the shuttle tube.

11. Slight pulsation of the hose will always be noticeable near the pump. Excessive pulsation of the hose near the pump is normally due to higher than average line pressures caused by stiff, harsh mixes or extremely long pumping distances. The use of larger I.D. hose than specified on page 3-8, para. 17 in these extreme cases reduces line pressures or the addition of slight amounts of water to the mix, if permissible, will permit easier pumping. The use of certain pumping admixtures may help. If excessive pulsation exists, it is advisable to use burlap or some means of protection under the hose at points where the hose may wear through the outer cover; e.g., over forms or steel or sharp curbs.

12. It is the responsibility of the pump operator to ensure that the delivery system hose and line system, with all clamps and accessories have a higher pressure rating than the concrete pump can generate. The model ST-70 generates 875 p.s.i.

13. Before starting the pumping operation, the following check list procedure should be followed:

9.2 MBVR – Air entraining, acts as a lubricant.

9.3 CALCIUM CHLORIDE – Commonly referred to as C.C. , is used as an accelerator. When pumping a load with calcium chloride, it is recommended that you wash out if the waiting time between delivery trucks becomes too long.

9.4 SUPER PLASTICIZERS – Acts as an accelerator. The concrete will look very wet after the super plasticizer is added, but will begin to set up very fast. Wash out immediately if you do not have a truck waiting. Super plasticizers are used mainly on commercial jobs.

9.5 RED LABEL – Acts as water retarder and an accelerator. Red label also will mainly be used on commercial jobs.

9.6 FLY ASH – Is used to help increase the strength of the concrete and decrease the cement content per yard. This is one of the most common admixtures used.

NOTE: All admixtures will be shown on the redi-mix concrete ticket. It is suggested before starting the pumping job you ask the driver of the redi-mix truck to see the concrete ticket and note the admixtures that exist and take the proper action.

13.1 Check engine oil.

13.2 Check oil reservoir to make sure that it is full.

13.3 Start and run the engine a minimum of five minutes

13.4 Cycle the pump at 6 strokes/minute maximum and

NOTE: When the redi-mix truck arrives, it is always a good idea to check the concrete ticket and make sure you have the proper mix design. When adding water to the mix, be sure not to get the concrete too wet. In other words, if you think the load of concrete needs 40 gallons, put in 20 gallons. You can always add more water to the load but you cannot extract the water from the load.

before starting the pumping operation.

warm oil to 50 degrees Fahrenheit.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 29

ST-70 — OPERATING PROCEDURES

14. All new pumps are ‘water pressure tested” at the factory This procedure permits a thorough inspection of entire drive system and valving under simulated full load conditions. The pump owner can do the same by making an adapter to couple to the end of the discharge cone:

#/8

" diameter

" drilled

e.g., the use of a standard 2" pipe cap with a hole in the center, screwed on to the end of hinged cone or reducer at the pump. Fill hopper with water after making sure that all sand and rock have been removed from manifold. Operate pump at full throttle and the hole restriction will create sufficient back pressure to make thorough inspection of all moving parts.

CLEANING THE PUMP AND DELIVERY SYSTEM

Cleaning the pump is a very important operation as it determines how the machine will

pump the next time it is used. At the end of every pour, or because of long delays during a

pour, the pump and delivery system must be thoroughly cleaned by removing all concrete material.

1. Ensure that there is no blockage in the hose and line (See page 29, Section 4) or in the shuttle tube (See Page 29, Section 7). If a blockage exists, clear it.

2. Pump concrete until the opening of the concrete cylinder intake in the hopper is visible.

3. Stop the pump.

4. Carefully disconnect the first hose joint at the shuttle tube discharge elbow.

7. Fill hopper with water. Pump until sponge and clean water come out the discharge end of the hose and line system.

8. When the Model ST-70 has been used to pump small aggregate concrete (pea rock, ½" minus) or mixes with high fines content (60% or more sand) there will be a tendency for hardened concrete to build up on the inside surface of the shuttle tube. Therefore, at the end of every such pour, after the pump and system have been cleaned and the engine shut off, remove the shuttle tube inspection plate (See Page 28, Section 7.4) and remove all remaining concrete.

9. When the Model ST-70 has been used to pump large aggregate concrete (¾" to 1 ½") follow the instructions in the above Section 8 once per week.

WARNING

Use only a 2½" diameter clean-out hook when backpumping into redi-mix truck. Use a safety chain to secure the clean-out hook to some solid part of the mixer truck to prevent hook from jumping off of the drum.

Run the pump at 6 strokes per minute maximum speed.

NEVER put your hands or any other parts of your body in the hopper while the engine is running or prior to any maintenance, check the accumulator pressure gauge and make sure the reading is zero pressure.

NEVER use muriatic acid to clean the pump. Acid will dissolve the chrome finish on material cylinder bore and main hydraulic cylinder rods.

5. Add water to the hopper. Pump and flush clean the entire hopper, shuttle tube and discharge elbow with water.

6. Scoop out 12 inches of concrete from the inboard end of the delivery hose. “Cork screw” a 6" x 6" x 8" sponge into the end of the first hose section. Reconnect the hose to the discharge elbow.

PAGE 30 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — TOWING INFORMATION

1. Position actuator ball socket above 2" ball. WARNING: Use jack stand to lift tongue. Do

hand as back injury could result.

CAUTION:

The ball capacity must be greater than or equal to the trailer GVWR. Do not use a worn hitch ball, it is unsafe and must be replaced. USE 2" BALL ONLY

NOTE:

Take care not to damage the actuator when backing up the towing vehicle for hook-up.

2. Hold the release handle in the open position (Figure 1).

NOT lift by

5. To make sure that the actuator is securely latched onto the

6. Insert a padlock or bolt through the lock hole for added

7. Connect the breakaway cable solidly to the bumper or frame

8. Make sure the breakaway cable is in a released position

ball, extend the trailer tongue jack to the ground and lift the truck and trailer combination 2" to 4". If the ball does not disengage, the actuator is securely attached.

protection.

of the tow vehicle as near to the center as possible. The cable must hang clear of the trailer tongue and be long enough to permit short radius turns without pulling the breakaway cable forward.

with the indicator bead touching or resting against the cable spring stop. (Figure 2).

CAUTION:

NOTE:

Fig. 1

3. Lower the trailer tongue until the ball rests in the ball socket.

4. Close the release handle.

CAUTION:

The release handle will close freely with finger pressure when the ball is properly inserted into ball socket. If the release handle does not close freely, do not tow the trailer. Do not force the release handle into the closed position.

Check the location of the breakaway cable periodically during each trip. The indicator should rest against the spring stop. Accidental application will cause the brakes to drag and heat up, causing a failure.

9. Cross the safety chains under the tongue and securely attach them to the bumper or frame of the tow vehicle. Check with local and state laws for proper compliance.

CAUTION:

Fig. 2

Do not use the breakaway cable as a parking brake.

Safety chains must always be used.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 31

ST-70 — TOWING INFORMATION

10. Retract the jack fully. Remove and store the caster, if applicable.

11. Check for proper truck-trailer hook-up; the tow vehicle and trailer should be level with a positive tongue load. For further information, consult a dealer or Atwood Service Center.

12. The back-up lever knob must be positioned in the “Towing Position” (Figure 3).

Fig. 3

BACKING UP

1. Refer to the previous steps 1 through 14 for Towing.

2. Before backing up a slope or through soft ground, pull the trailer forward slightly to assure that the actuator socket is in the fully forward position.

3. Move the lever knob on the side of the actuator downward from the “Towing Position” along the curved slot in the actuator frame to the “Back-up Position” (Figure 3). The slot has a notch at the bottom of its travel. Push the lever knob down to engage the locking notch.

4. Back the trailer up.

CAUTION:

Avoid sharp turns. This could bend, create extreme stress or fracture either the actuator or trailer tongue.

13.Do not use the Atwood brake actuator with a sway controller, unless prior Atwood Engineering approval of the sway control system has been received.

14. You are now ready to tow your pump.

CAUTION:

Avoid sharp turns. This could bend, create extreme stress or fracture either the actuator or trailer tongue.

PAGE 32 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — TOWING INFORMATION

5. If the pump is to be uncoupled from the tow vehicle after backing with the lever knob engaged, block all pump wheels and pull forward slightly to take strain off of the actuator. Uncouple the actuator by lifting the release handle and raising the trailer tongue. Make sure the lever knob is in the “Towing Position” when uncoupling from the trailer.

CAUTION:

Before towing the pump, always ensure that the lever knob has disengaged and is in the “Towing Position.”

MAINTENANCE

1. Keep all links and pivots lubricated to prevent rusting and ensure ease of operation. Using SAE 30 oil, lubricate inside the release handle and inside the actuator body. This can be reached from the underside of the actuator.

NOTE:

Lubricate the hitch ball with conventional automotive grease or a lubricant made for hitch balls.

Extended Storage Instructions

The following preventative maintenance is recommended for extended periods of storage.

1. Check brake system for proper fluid level in master cylinder and bleed all lines.

2. Lubricate all links and pivots to prevent any rusting.

3. Remove wheel and drum assemblies and spray a good anti-corrosion compound (CRC formula 5-56) under rubber boot on forward end of brake wheel cylinder. Avoid spraying drum and brake lining.

4. Grease all bearings and reinstall wheel and drum assemblies.

5. Make sure breakaway cable is fully released.

6. After extended storage, refer to the Maintenance Steps listed above to insure that the trailer is ready for towing.

2. Check for any leaks in the brake system. Periodic checks should be made on all hoses to guard against cuts and worn hoses which may cause failure (leaks, rupturing under pressure, and collapsing). Replace defective hoses.

3. Check the brake fluid level in the master cylinder reservoir. Keep it filled to within ½" from the top of the reservoir.

CAUTION:

Do not fill the master cylinder reservoir with used brake fluid. Do not fill the reservoir beyond ½" from top. Do not overfill, brake fluid will damage paint.

4. At the beginning of each year, inspect the brakes for excessive wear, replace the linings if necessary.

NOTE:

Wheel bearings and seals should be inspected and packed at this time.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 33

EXPLANATION OF CODE IN REMARKS COLUMN

The following section explains the different symbols and remarks used in the Parts section of this manual. Use the help numbers found on the back page of the manual if there are any questions.

The contents and part numbers listed in the parts section are subject to change guarantee the availibility of the parts listed.

Sample Parts List:

NO. PART NO. PART NAME QTY. REMARKS

1 12345 BOLT ....................... 1.... INCLUDES ITEMS W/

2*12347 WASHER, 3/8 IN. .... 1 ....

3 12348 HOSE .................... A/R .. MAKE LOCALLY

4 12349 BEARING ................ 1 .... S/N 2345B AND ABOVE

NO. Column

Unique Symbols - All items with same unique symbol

, #, +, %, or >) in the number column belong to the same

(

assembly or kit, which is indicated by a note in the “Remarks” column.

Duplicate Item Numbers - Duplicate numbers indicate multiple part numbers are in effect for the same general item, such as different size saw blade guards in use or a part that has been updated on newer versions of the same machine.

NOTE

without notice

WASHER, 1/4 IN. ...........

When ordering a part that has more than one item number listed, check the remarks column for help in determining the proper part to order.

. Multiquip does not

NOT SOLD SEPARATELY MQ-45T ONLY

QTY. Column

Numbers Used - Item quantity can be indicated by a number,

a blank entry, or A/R. A/R (As Required) is generally used for hoses or other parts

that are sold in bulk and cut to length. A blank entry generally indicates that the item is not sold

separately. Other entries will be clarified in the “Remarks” Column.

REMARKS Column

Some of the most common notes found in the “Remarks”

Column are listed below. Other additional notes needed to describe the item can also be shown.

Assembly/Kit

symbol will be included when this item is purchased. Indicated by:

“INCLUDES ITEMS W/(unique symbol)”

Serial Number Break

range where a particular part is used. Indicated by:

“S/N XXXXX AND BELOW” “S/N XXXX AND ABOVE” “S/N XXXX TO S/N XXX”

Specific Model Number Use

only with the specific model number or model number variant listed. It can also be used to show a part is NOT used on a specific model or model number variant.

Indicated by:

“XXXXX ONLY” “NOT USED ON XXXX”

- All items on the parts list with the same unique

- Used to list an effective serial number

- Indicates that the part is used

PART NO. Column

Numbers Used - Part numbers can be indicated by a number,

a blank entry, or TBD. TBD (To Be Determined) is generally used to show a part that

has not been assigned a formal part number at time of publication.

A blank entry generally indicates that the item is not sold separately or is not sold by Multiquip. Other entries will be clarified in the “Remarks” Column.

PAGE 34 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

“Make/Obtain Locally”

purchased at any hardware shop or made out of available items. Examples include battery cables, shims, and certain washers and nuts.

“Not Sold Separately”

purchased as a separate item and is either part of an assembly/kit that can be purchased, or is not available for sale through Multiquip.

- Indicates that the part can be

- Indicates that an item cannot be

ST-70 — SUGGESTED SPARE PARTS

ST-70 Structural Concrete Pump

1 Units

Qty. P/N Description

1 .......... EM16462 .............. FELT HOLDER

4 .......... EM16463 .............. PISTON CUP

4 .......... EM16493 .............. FELT RING

1 .......... EM16461 .............. OIL PARTS

2 .......... EM14408 .............. BRONZE RING

2 .......... EM16145 .............. BUSHING, SWING AXLE (BRONZE )

1 .......... EM16171 .............. WEAR RING

2 .......... EM16816-1 ........... ENERGIZER RING

1 .......... EM16816-2 ........... INSERT RING

2 .......... EM16819 .............. SLEEVE SEAL

1 .......... EM25841 .............. WEAR PLATE

2 .......... EM97024 .............. SWITCH, PROXIMITY

1 .......... EM50417 .............. CUP

1 .......... EM20709-1 ........... SOLENOID

2 .......... EM97050 .............. RELAY (IDEC)

1 .......... EM97048 .............. RELAY

1 .......... EM97021 .............. SOLENOID

1 .......... EM97036 .............. SWITCH, PUMP CONTROL

1 .......... EM97045 .............. SWITCH, OPERATION PUMP/ENG

ST-70 Structural Concrete Pump

3 Units

Qty. P/N Description

1 .......... EM16459 .............. PIN

2 .......... EM25801 .............. CONCRETE CYLINDER

2 .......... EM16462 .............. FELT HOLDER

6 .......... EM16463 .............. PISTON CUP

8 .......... EM16493 .............. FELT RING

2 .......... EM16461 .............. OIL PARTS

2 .......... EM14408 .............. BRONZE RING

4 .......... EM16145 .............. BUSHING, SWING AXLE (BRONZE )

3 .......... EM16171 .............. WEAR RING

4 .......... EM16816-1 ........... ENERGIZER RING

2 .......... EM16816-2 ........... INSERT RING

4 .......... EM16819 .............. SLEEVE SEAL

2 .......... EM25841 .............. WEAR PLATE

4 .......... EM97024 .............. SWITCH, PROXIMITY

3 .......... EM50417 .............. CUP

2 .......... EM20709-1 ........... SOLENOID

4 .......... EM97050 .............. RELAY (IDEC)

2 .......... EM97048 .............. RELAY

2 .......... EM97021 .............. SOLENOID

2 .......... EM97036 .............. SWITCH, PUMP CONTROL

2 .......... EM97045 .............. SWITCH, OPERATION PUMP/ENG

NOTE

Part numbers on this Suggested Spare Parts List may supercede/ replace the P/N shown in the text pages of this book.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 35

The safety instruction decals shown must be on all

Mayco ST70 — Concrete Pump

A MANUAL MUST BE STORED

ATTENTION

BEFORE SET-UP AND OPERATION OF THIS EQUIPMENT THE DESIGNATED OPERATOR MUST READ AND COMPLETELY UNDERSTAND THE OPERATING AND INSTRUCTION MANUAL INSIDE THIS TUBE.

CAUTION TOWING

1. USE ONLY 2" STEEL BALL

2. TOWING VEHICLE AND HITCH MUST BE RATED TO TOW 4300 LB. LOAD

3. ALWAYS USE SAFETY CHAIN AND BREAKAWAY CHAIN WHEN TOWING UNIT.

4. INSPECT ACTUATOR AND BRAKES BEFORE TOWING UNIT (REFER TO ATWOOD MANUAL DECALS ON HITCH).

IN THIS TUBE AT ALL TIMES.

ST-70 — DECALS

CAUTION

REFER TO MANUAL FOR SERVICE INSTRUCTIONS

CHARGE ONLY WITH

DRY NITROGEN

CAUTION !

1. Before setup and operation of this equipment, the designated operator MUST read and completely understand the operating instruction manual.

2. keep unauthorized and untrained people

away from the machine during operation.

3. Rotating or moving parts will cause serious injury. Before servicing or cleaning, turn off the engine and check accumulator pressure gauge for ZERO pressure reading.

4. Do not place hands in lubrication box at

any time.

5. Keep hands out of hopper when engine is

running. Do not remove or stand on hopper grates.

6. Check hopper for obstructions before operating machine.

7. This machine is remotely controlled and may start at any time.

8. Stop engine before adding fuel or oil.

9. When the pump, manifold or delivery

system plugs, do NOT disconnect the delivery system clamps or open the manifold. A plug has occurred when the pump is running but no concrete is discharging from the end of the delivery system; immediately switch the engine OFF. Consult your operating and instruction manual before proceeding.

Great care must be taken to clear a plug as a dangerous condition, due to high pressure build-up, inside the pump and delivery system.

CAUTION

MINIMUM OIL LEVEL

Oil level below minimum can cause hydraulic pump and system damage. Oil temperature should not exceed 170 F (77 C).

PAGE 36 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — DECALS

ST- 70 DECALS

NO. PART NO. PART NAME QTY. REMARKS

1 EM935 DECAL, ATTENTION, MANUAL STORAGE 1 2 EM969 DECAL, CAUTION TOWING 1 3 EM7072 DECAL, CAUTION OPERATING INSTRUCTIONS 3 4 EM97084 DECAL, MAINTENANCE 1 5 EM955 DECAL, CAUTION DRY NITROGEN 1 6 EM97083 DECAL, WARNING 1 7 EM97071 DECAL, CAUTION MINIMUM OIL LEVEL 1

EM1028 DECAL, MAYCO LOGO 2 EM97082 DECAL, ST-70 2 EM97080 DECAL, EMERGENCY CYCLING 1 EM965 DECAL, VOLUME CONTROL 1 EM995 DECAL, DIESEL FUEL 1 EM985 DECAL, HYDRAULIC OIL 1 EM97070 DECAL, PRESSURE GAUGES 1 EM1032 DECAL, 800 MAYCO PHONE 2 EM98000 DECAL, CAUTION GREASE 4 EMDCLST70 DECAL KIT, ST70 1 INCLS. ALL ITEM ABOVE

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 37

ST-70 — CONTROL PANEL INSTALLATION

PAGE 38 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — CONTROL PANEL INSTALLATION

ST- 70 CONTROL PANEL INTALLATION

NO. PART NO. PART NAME QTY. REMARKS

1 EM97073 PANEL, CONTROL ASSY 1 2 EM492661 NUT, 1/4"-NC HEX. 2 3 EM492622 WASHER, 1/4" LOCK 2 4 EM492357 BOLT, 1/4"-NC x 1" HEX. 2 5 EM491873 CONNECTOR 1 6 EM5015901 CONNECTOR 3 7 EM491876 WASHER, CONNECTOR 4 8 EM509738 CABLE 18 GA. 1 9 EM509588 POLIFLEX 1 10 EM503112 BOLT, 3/8"-NC x 2 3/4" HEX. 2 11 EM923027 WASHER, 3/8" 2 12 EM923350 WASHER, LOCK 3/8" 2 13 EM492554 NUT 3/8"-NC HEX. 2

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 39

ST-70 — CONTROL PANEL FRONT

PAGE 40 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — CONTROL PANEL FRONT

ST- 70 CONTROL PANEL FRONT

NO. PART NO. PART NAME QTY. REMARKS

1 EM97073 CONTROL PANEL ASSY 1 ............ (INCLS. SWITCHES AND INTERIOR

ITEMS AS SHOWN ON PAGES 32 & 33). 2 EM25704 TACHOMETER 1 3 EM97063 SWITCH, EMERGENCY STOP 1

EM97064 NAME PLATE, EMERGENCY STOP 1 4 EM97062 HOUR METER 1 5 EM97028 SWITCH, IGNITION 1

EM97028K KEY, IGNITION SWITCH 1

EM97029 NAME PLATE, IGNITION 1 6 EM97039 PILOT LIGHT, AIR FILTER 1

EM90741 CONTACT BLOCK 1

EM97043 NAME PLATE, AIR FILTER 1 7 EM97039 PILOT LIGHT, OIL PRESSURE 1

EM97041 CONTACT BLOCK 1

EM97044 NAME PLATE, OIL PRESSURE 1 8 EM97039 PILOT LIGHT, BATTERY 1

EM97041 CONTACT BLOCK 1

EM97042 NAME PLATE, BATTERY 1 9 EM97030 SWITCH, DIRECTIONAL CONTROL 1

EM97031 NAME PLATE, DIRECTIONAL FWD/REV. 1 10 EM97045 SWITCH, OPERATION PUMP/ENGINE 1

EM97035 NAME PLATE, OPER. PUMP/ENGINE 1 11 EM97032 SWITCH, TEST FUNCTION 1

EM97034 NAME PLATE, TEST ON/OFF 1 12 EM97036 SWITCH, PUMP CONTROL 1

EM97038 NAME PLATE, CONTROL/REMOTE 1 13 EM97032 SWITCH, FAN CONTROL 1

EM97033 NAME PLATE, FAN ON/OFF 1 14 EM97068 RECEPTACLE, REMOTE CONTROL 1 15 EM97046 CASE, CONTROL PANEL (NO COMPONENTS) 1 X EM97099 REMOTE CONTROL CABLE 1 X EM26793 CORD CABEL ADAPTOR 1 X EM23713R OPTIONAL — RADIO REMOTE CONTROL ASSY 1

X NOT ILLUSTRATED

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 41

ST-70 — CONTROL PANEL INTERIOR

PAGE 42 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — CONTROL PANEL INTERIOR

EXPLODED VIEW OF TERMINAL

BLOCK (page 42)

6 AMP DIODE, REPLACE WITH

EGG5812 OR EQUIVALENT

REMOTE CONTROL

PROX SW

BATTERY

MAGNET

VALV E

START-STOP

1 AMP DIODE, REPLACE WITH

D19

D17

D10

D11

IN4004 OR EQUIVALENT

HYD PRESS

COMPENSATOR

PRESS

TEST

SOL

UNLOAD

SOL

COOLING

FAN MOTOR

D15

D14

D13

1610

THROTTLE

SOL

REV

SOL

PILOT

VALV E

SOL B

PILOT

VALV E

SOL A

D12

TB1

TB2

D20

D16

TB1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 43

ST-70 — CONTROL PANEL INTERIOR

ST- 70 CONTROL PANEL INTERIOR

NO. PART NO. PART NAME QTY. REMARKS

1 EM97050 RELAY (IDEC) 2 2 EM97048 RELAY 1 3 EM97027 SOLENOID 3 4 EM97078 FUSE, 15 AMP 3 5 EM98001 DIODE, 6 AMP 1 6 EM98002 DIODE, 1 AMP 19 7 EM40711 SWITCH, ITL1-1 1

PAGE 44 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

NOTE PAGE

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 45

ST-70 — MAIN DRIVE PUMPS

PAGE 46 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — MAIN DRIVE PUMPS

ST-45 MAIN DRIVE PUMPS

NO. PART NO. PART NAME QTY. REMARKS

1 EM 97088 COUPLING ASSY, ENGINE 1 2 EM 506611 SOCKET HD. M12 x 20 6 3 4 5 6 EM 25459 ELBOW 90 DEG. 7 EM 509777 HOSE, CASE DRAIN LINE 8 EM 509784 ELBOW 90 DEG. 9 EM 505882 WILLIAM WASHER 518" 2 10 EM 492627 WASHER, LOCK 5/8" 2 11 EM 503982 BOLT, HEX. HD 518"-NC x 2" 2 12 EM 97086 PUMP, PISTON 1 13 EM 25429 ELBOW 90 DEG. 1 14 EM 509937 HOSE, COMPENSATOR 1 15 EM 492624 WASHER, LOCK 318" 2 16 EM 492375 BOLT, HEX. HD 3/8"-NC x 1" 2 17 EM 609783 HOSE, SUCTION GEAR PUMP 1 18 EM 609796 ADAPTER 1 19 EM 16524 ELBOW, 90 DEG. 2 20 EM 492375 BOLT, HEX. HD 318"-NC x 1" 1 21 EM 25511 ADAPTER 1 22 EM 509793 NIPPLE 1 23 EM 509794 COUPLE 1 24 EM 509795 ELBOW 90 DEG, 1 26 EM 509774 PUMP, DUAL GEAR 1 27 EM 16190 GASKET 1 28 EM 509787 HOSE, RETURN LINE (HEAT EXHAUST) 1 29 EM 25497 ELBOW 90 DEG. 1 30 BLOCK, MANIFOLD 1 31 EM 499799 SOCKET HD. 1/2"-NC x 5 1/2" 4 32 EM98005 VALVE, NEEDLE 1 33 EM98004 VALVE, RELIEF 1 34 35 EM 162 SOCKET HD. MI 0 x 25 10 36 EM 506195 ELBOW, 90 DEG, 1

O-RING 1

CONTACT FACTORY

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 47

ST-70 — MANIFOLD CONTROL

PAGE 48 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — MANIFOLD CONTROL

ST-70 MANIFOLD CONTROL

NO. PART NO. PART NAME QTY. REMARKS

1 EM97011 DIRECTIONAL CONTROL VALVE, HYDRAULIC CYLINDER 1 2 EM97013 DIRECTIONAL CONTROL VALVE, SHUTTLE CYLINDER 1 2A EM97002 PILOT VALVE 3 EM509342 SOCKET HEAD, 3/8"-NC x 2-1/2" 8 4 EM196 SOCKET HEAD, 1/4"-NC x 2-1/4" 4 5 EM508804 SOCKET HEAD, 10-NC x 2" 4 6 EM52500176 MANIFOLD BLOCK 1 7 EM25462 ADAPTER 3 8 EM509375 HOSE, CHECK VALVE TO TANK 1 9 EM97003 CARTRIDGE, MAXIMUM PRESSURE TEST 1 10 EM98006 PLUG 1 11 EM25429 ELBOW 90 DEG. 2 12 EM509517 HOSE, PUMP PRESSURE GAUGE 1 13 EM98007 FITTING 3 14 EM509511 HOSE, MAIN PRESSURE LINE 2 15 EM509374 HOSE, PRESSURE LINE TO CYLINDER 1 16 EM25498 ADAPTER 4 17 EM97005 CARTRIDGE, BLEED OFF 1 18 EM509400 HOSE, TANK 1 19 EM97010 CARTRIDGE, PILOT RELIEF 1 20 EM509367 HOSE, ACCUMULATOR CIRCUIT 1 21 EM492376 BOLT, HEX. 3/8"-NC x 1 1/4" 4 22 EM492624 WASHER, LOCK 3/8" 4 23 EM509581 HOSE, ACCUMULATOR TO MANIFOLD 1 24 EM509398 ADAPTER 1 25 EM509353 ELBOW 90 DEG. 1 26 EM509352 ELBOW 90 DEG. 1 27 EM509516 HOSE, PRESSURE GAUGE, ACCUMULATOR 1 28 EM509372 HOSE, ACCUMULATOR CYLINDER 1 29 EM97008 CARTRIDGE, UN-LOADING VALVE 1 30 EM509373 HOSE, ACCUMULATOR CYLINDER 1 31 EM25539 PLUG 2

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 49

ST-70 — ACCUMULATOR

PAGE 50 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — ACCUMULATOR

ST-70 ACCUMULATOR

NO. PART NO. PART NAME QTY. REMARKS

1 EM97015 ACCUMULATOR 1 2 EM97016 CLAMP 1 3 EM509425 ADAPTER 1 4 EM509353 ELBOW 90 DEG. 1 5 EM509562 BOLT, HEX. HD 3/8"-NC x 5/8" 2 6 EM492624 WASHER, LOCK 3/8"-NC 2 7 EM492598 WASHER, 3/8" 2 8 EM509444 BRACKET 1 9 EM492373 BOLT, HEX. HD 3/8"-NC x 3/4" 2

EM98099 ACCUMULATOR REPAIR KIT 1

NOT ILLUSTRATED

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 51

ST-70 — HYDRAULIC/CONCRETE CYLINDERS

PAGE 52 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — HYDRAULIC/CONCRETE CYLINDERS

ST-70 HYDRAULIC / CONCRETE CYLINDERS

NO. PART NO. PART NAME QTY. REMARKS

1 EM510265 BOLT, HEX. HD. 3/8"-NC x 3 1/4" 6 2 EM16464 PLATE, FACE 2 3 EM16465 SPACER 6 4 EM16463 PISTON CUP 2 5 EM14408 RING, BRONCE 2 6 EM16493 RING, FELT 2 7 EM16462 FELT HOLDER 4 8 EM16461 PLATE, OILER 2 9 EM14407 O-RING 2 10 EM25801 CYLINDER, CONCRETE 2 11 EM25110 RETAINER, CYLINDER 4 12 EM492624 WASHER, LOCK 3/8" 14 13 EM492598 WASHER, 3/8" 22 14 EM492375 BOLT, HEX. HD. 3/8"-NC x 1" 8 15 EM16174 O-RING 2 16 EM492451 BOLT, HEX. HD. 3/8"-NF x 1" 8 17 EM50443 SEAL, OIL 8 18 EM509417 TANK, LUBE 1 19 EM492378 BOLT, HEX. HD. 3/8"-NC x 1 3/4" 1 20 EM508517 COVER, TANK 1 21 EM50425 FLANGE 2 22 EM27435-1 SEAL 2 23 EM16460 ADAPTER 2 24 EM97076 CYLINDER HYDRAULIC 1 25 EM97077 CYLINDER HYDRAULIC 1 26 EM25497 ELBOW 4 27 EM16454 CLEVIS PIN 2 28 EM505723 COTTER PIN 5/32" x 1-½” 4 29 EM97024 SWITCH, PROXIMITY 2 30 EM97025 CONDUCTOR, CYLINDER SWITCH 2 31 EM18447 PLUG PIPE 3/4" 1 32 EM25474 HOSE 1 33 EM25843 PLATE, WEAR 1 34 EM265 BOLT, FLAT SOCKET HD. 5/8"-NC 2 35 EM264 BOLT, FLAT SOCKET HD. 1/2"-NC 1 36 EM295 BOLT, FLAT SOCKET HD. 3/4"-NC 2

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 53

ST-70 — SHUTTLE TUBE ASSY

PAGE 54 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SHUTTLE TUBE ASSY

ST-70 SHUTTLE TUBE ASSY

NO. PART NO. PART NAME QTY. REMARKS

1 EM417 NUT, LOCK 1"-14 NS 1 2 EM509221 NUT, HEX1"-14 NS 1 3 EM16814 TENSIONER 1 4 EM25236 AXLE, CRANK 1 5 EM16169 WASHER, THRUST 1 6 EM16145 BUSHING, BRONZE 2 7 EM492397 BOLT, HEX 1/2"-NC x 2-1/2" 4 8 EM25454 CYLINDER, SHUTTLE 1 9 EM210 BOLT, HEX. HD 1/2"-NC x 3-1/4" 6 10 EM25803 BEARING, DISCHARGE NIPPLE 1 11 EM16819 SEAL 1 12 EM25836 NIPPLE, DISCHARGE 1 13 EM25454-9 BASE, CYLINDER 1 14 EM621 WILLIAM WASHER, 1/2" 4 15 EM492626 WASHER, LOCK 1/2" 4 16 EM492584 NUT, LOCK 1/2" 1 17 EM284 STUD, 1"-14 NS 1 18 EM16175 O-RING 1 19 EM16170 RING, SEAL 1 20 EM16176 O-RING 1 21 EM25843 NUN PLATE 1 22 EM16171 RING, WEAR 1 23 EM16816-2 RING, INSERT 1 24 EM16816-1 RING, ENERGIZER 1 25 EM492393 BOLT, HEX. HD 1/2"-NC x 1-1/4" 4 26 EM16802 PLATE, INSPECTION 1 27 EM20816 O-RING 1 28 EM16811 SHUTTLE TUBE 1 29 EM492627 WASHER, LOCK 5/8" 8 30 EM503982 BOLT, HEX. HD 5/8"-NC x 2" 8 31 EM25836 NIPPLE, DISCHARGE 1 32 EM28906 COUPLING 5", OPTIONAL 1 33 EM25837 ELBOW, REDUCING, 5" x 4", OPTIONAL 1 34 EM25568 GREASE FITTING 1 35 EM16426 GREASE FITTING 1 36 EM25500 ELBOW 45 DEG. 1 37 EM25459 ELBOW 90 DEG. 1 38 EM717 PIN, COTTER 1 39 EM26126 PIN, CLEVIS 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 55

ST-70 — HOPPER ASSY

PAGE 56 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — HOPPER ASSY

ST-70 HOPPER ASSY

NO. PART NO. PART NAME QTY. REMARKS

1 EM25301 SHAFT DRIVE END 1 2 EM25863 REMIXER 1 3 EM492375 BOLT, HEX HD 3/8"-NC x 1" 8 4

5 EM23305 SHAFT, DRIVE END 1 6 EM491686 COTTER PIN 1/8" x 1-3/4" 2 7 EM16159 PIN, HINGE 1 8 EM505723 COTTER PIN 5/32" x 1-1/2" 1 9 EM70134-2 PIN, SPLASH 1 10 EM70134 PLATE, SPLASH 1 11 EM16188 SCREEN, HOPPER 1 12 EM492397 BOLT, HEX HD 1/2"-NC x 2-1/2" 8 13 EM492626 WASHER, LOCK 1/2" 10 14 EM18135 BEARING, FLANGE 2 15 EM25568 FITTING LUBE, 45 DEG. 2 16 EM22250 SPACER 4 17 EM18136 PLATE, SPACER 8 18 EM18138 SPACER, SEAL 16 19 EM18137 SEAL, SHAFT 4 20 EM16426 FITTING, LUBE, 90 DEG. 3 21 EM508812 FITTING, LUBE 5 22 EM491701 FITTING, GREASE 5 23 EM505121 BOLT, HEX HD 3/4"-NC x3" 4 24 EM14165 EYE BOLT 4 25 EM619 WILLIAM WASHER 3/4" 4 26 EM492558 NUT 3/4"-NC 8 27 EM50141 BRACKET, MOTOR MTG. 1 28 EM505719 KEY 1 29 EM25425 MOTOR, REMIXER 1 30 EM492394 BOLT, HEX HD 1/2"-NC x 1-1/2" 2 31 EM16166 TIE ROD 2 32 EM25174 HOPPER 1 33 EM505728 NUT, HEX. 1"-NC 6

34 35 36 37 38 EM491698 FITTING, GREASE 2

EM492624 WASHER, LOCK 3/8" 12

EM70860 HOPPER CLEAN OUT PLUG, ASSY ........................ 1 ........................ INCLS. ITEMS W/

EM70860-1 PLATE, TOP 1

EM50417 CUP 1

EM508830 HANDLE 1

EM492378 BOLT, HEX HD 3/8"-NC x 1-3/4" 4

16184 HOPPER SEAL 1

NOT ILLUSTRATED

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 57

ST-70 — REMIXER CONTROL ASSY

PAGE 58 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — REMIXER CONTROL ASSY

ST-70 REMIXER CONTROL ASSY

NO. PART NO. PART NAME QTY. REMARKS

1 EM25425 MOTOR, REMIXER 1 2 EM25508 ELBOW, 45 DEG. 2 3 EM25483 HOSE, MOTOR TO VALVE 2 4 EM25509 ADAPTER 2 5 EM509378 HOSE, RETURN TO HEAT EXCHANGER 1 6 EM25507 ELBOW, 90 DEG. 1 7 EM25495 VALVE, REMIXER 1 8 EM492553 NUT, HEX. 5/16"-NC 2 9 EM492623 WASHER, LOCK 5/16" 2 10 EM218 BOLT, HEX. HD 5/16"-NC x 2 1/2" 2 11 EM509370 HOSE, TO BEAR PUMP 1 12 EM98014 TEST PORT 1 13 EM98015 ADAPTOR 1 14 EM25563 TEE 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 59

ST-70 — THROTTLE ASSY

PAGE 60 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — THROTTLE ASSY

ST-70 THROTTLE ASSY

NO. PART NO. PART NAME QTY. REMARKS

1 EM20709-1 SOLENOID 1 2 EM400 NUT, HEX. 1/4"-NF 2 3 EM26315 ADAPTER 1 4 EM492357 BOLT, HEX. HD. 1/4"-NC x 1" 1 5 EM959119 CLEVIS 1 6 EM722 STOP NUT 1 7 EM492598 NUT, LOCK 5/16"-NC 2 8 EM492364 BOLT, HEX. HD. 5/16"-NC x 1" 1 9 EM16740-2 CABLE, THROTTLE 1 10 EM16740-1 HANDLE, THROTTLE 1 11 EM492581 NUT, LOCK 1/4"-NC 5 12 EM492622 WASHER, LOCK 1/4" 4 13 EM508821 BOLT, HEX. HD. 1/4"-NC x 3/4" 4 14 15 EM492558 NUT, LOCK 3/8"-NC 1 16 EM503623 BOLT, HEX. HD. 3/8"-NC 1 17 EM509414 BRACKET 1 18 EM509510 SPRING 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 61

ST-70 — ENGINE AND FRAME

40A

PAGE 62 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — ENGINE AND FRAME

ST-70 ENGINE AND FRAME

NO. PART NO. PART NAME QTY. REMARKS

1 EM25454 CYLINDER, SHUTTLE 1 2 EM25459 ELBOW, 3/4" x 90° 1 3 EM25500 ELBOW, 3/4" x 45° 1 4 EM132 BOLT, HEX HD, 1/2-13 x 2" 4 5 EM621 WILLIAM WASHER, 1/2" 4 6 EM606 WASHER, LOCK, 1/2" 4 7 EM404 NUT, HEX, 1/2"-13 4 8 EM25160 STAND, REAR STABLIZER 2 9 EM14138 HANDLE, TEE 2 10 EM14165 BOLT, EYE 4 11 EM619 WILLIAM WASHER, 3/4" 4 12 EM407 NUT, HEX, 3/4-10 8 13 EM119 BOLT, HEX, 3/4-10 x 3" 4 14 EM26112 PLATE ASSY, REAR 1 15 EM25841 PLATE, WEAR 1 16 EM16174 O-RING, WAER PLATE 2 17 EM295 BOLT, HEX HD 2 18 EM70134 PLATE, SPLASH 1 19 EM16159 PIN, HINGE, SPLASH PLATE 1 20 EM70134-2 PIN, SPLASH PLATE 1 21 EM717 PIN, COTTER 1 22 EM80101 FRAME ASSY 1 23 EM16459 PIN, CLEVIS 2 24 EM14169 GREASE FITTING 2 25 EM16602 2" HYDRAULIC SURGE BRAKE ASSY 1 26 EM25610 JACK STAND, SWIVEL 1 27 EM20135 CHAIN, SAFETY 1 28 EM25608 WIRE, #16/5 x 18' 1 29 EM25607-1 PLUG, MALE #16/5 1 30 EM25607-2 SOCKET, FEMALE #16/5 1 31 EM25607-3 BOOT 1 32 EM26536 LIGHT, TAIL 2 33 EM25711 ENGINE, DIESEL HATZ 4M40L 1 34 EM509436 O-RING 1 35 EM527442 ELBOW 45° 1 36 EM492394 BOLT, HEX HD, 1/2"-NC x 1-1/2" 4 37 EM635 WASHER, LOCK 1/2" 4 38 020310080 NUT 2 39 030210250 WASHER 2 40 EM01060100 SHOCK ABSORBER 4 40A EM03642900 STUD, SHOCK ABSORBER 8 41 EM264 BOLT 1/2" x 13 x 3" 1 42 EM265 BOLT 5/8" x 11 x 3" 2

510269 ENGINE HOOD 1

NOT ILLUSTRATED

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 63

ST-70 — OIL COOLER ASSY

PAGE 64 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — OIL COOLER ASSY

ST-70 OIL COOLER ASSY

NO. PART NO. PART NAME QTY. REMARKS

1 EM509805 GUARD, COOLER 1 2 EM492364 BOLT, HEX. HD. 5/16"-NC x 1" 4 3 EM923023 WASHER, 5/16" 4 4 EM509791 COOLER 1 5 EM509779 HOSE 1 6 EM509802 SHROUD, COOLER 1 7 EM492622 WASHER, LOCK 1/4" 4 8 EM492356 BOLT, HEX. HD. 1/4"-NC x 3/4" 4 9 EM492376 BOLT, HEX. HD. 3/8"-NC x 1" 2 10 EM492598 WASHER, 3/8" 2 11 EM492583 NUT, LOCK 3/8"-NC 2 12 EM509402 NUT 1 13 EM509345 FITTING 1 14 EM509344 TEE 1 15 EM509401 ELBOW, 90 DEG. 1 16 EM509343 TEE 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 65

ST-70 — FUEL AND HYDRAULIC TANK

PAGE 66 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — FUEL AND HYDRAULIC TANK

ST-70 FUEL AND HYDRAULIC TANK

NO. PART NO. PART NAME QTY. REMARKS

1 EM509406 TANK, FUEL & HYDRAULIC 1 2 EM175 BOLT, HEX 3/8"-NC x 1 1/4" 4 3 EM492598 WASHER 3/8" 5 4 EM492583 NUT, LOCK 3/8" 5 5 EM18436 ELBOW 1 6 EM16517 REDUCER 1 7 EM50424 STRAINER 1 8 EM16433 ELBOW 1 9 EM27441 ELBOW 1 10 EM635 WASHER, HI-COLLAR 1/2" 4 11 EM492455 BOLT, HEX 1/2"-NF x 1-1/2" 4 12 EM26471 CLAMP 1 13 EM509437 HOSE 1 14 EM508826 TUBE, PLASTIC 1 15 EM20426 ELBOW 4 16 EM20421 VALVE 1 17 EM503117 BOLT, HEX 3/8"-NC x 3" 1 18 EM16513 DEFUSER 1 19 EM16516 PIPE 1 20 EM16478 GAUGE, LEVEL-TEMP. 1 21 EM16477 FILL CAP ASSY. 1 22 EM25217 CAP, GAS 1 23 EM492375 BOLT, HEX 3/8"-NC x 1" 4 24 EM16512 FILTER 1 25 EM25119-1 COVER 1 26 EM492374 BOLT, HEX 5/16"-NC x 1" 20 27 EM492623 WASHER, LOCK 5/16" 2 0 28 EM25184 GASKET 1 29 EM508827 TUBE, PLASTIC 1 30 EM492624 WASHER 3/8" 1 31 EM50466 O-RING 1 32 EM509369 ADAPTER 1 33 EM491237 VALVE 1 34 EM506094 PLUG 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 67

ST-70 — BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES

PAGE 68 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES

ST-70 BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES

NO. PART NO. PART NAME QTY. REMARKS

1 EM26536 LIGHT, TAIL 2 2 EM26536-1 BRACKET, TAIL LIGHT 2 3 EM492364 BOLT, HEX. 5/16"-NC x 1" 4 4 EM492623 WASHER, LOCK 5/16" 4 5 EM492553 NUT, HEX. 5/16"-NC 4 6 EM492561 NUT, HEX.1/4"-NC 2 7 EM492622 WASHER, LOCK 1/4" 5 8 EM492596 WASHER 1/4" 2 9 EM25708 FRAME 1 10 EM509105 CABLE, BATTERY GROUND 1 11 EM16738 BATTERY, 12 VOLT 1 12 EM16707 CABLE, BATTERY POSITIVE 1 13 EM25523 ADAPTER 2 14 EM97066 GAUGE, ACCUMULATOR PRESSURE 1 15 EM97067 GAUGE, MAIN 1 16 EM491396 ELBOW 1 17 EM269 SOCKET HEAD, M10 x 30 2 18 EM509449 BRACKET, WATER SEPERATOR FILTER 1 19 EM16747 FILTER ASSY., WATER SEPERATOR 1 19A EM26465 ELEMENT, FILTER 1 20 EM492356 BOLT, HEX. HD 1/4"-NC x 3/4" 3 21 EM20426 ELBOW, 90 DEG. 2 22 EM716 CLAMP, HOSE 2 23 EM20427 HOSE 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 69

ST-70 — AXLE AND BRAKES

PAGE 70 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — AXLE AND BRAKES

ST-70 AXLE AND BRAKES

NO. PART NO. PART NAME QTY. REMARKS

1 EM26519 NUT, CHROME 12 2 EM26615 TIRE AND WHEEL 2 3 EM26520 CAP, HUB 2 4 EM491690 PIN, COTTER 5/32" x 2" 2 5 EM16610 DRUM, BRAKE 2 6 EM26601 CAP, GREASE 2 7 EM26113 NUT, CASTLE 2 8 EM26111 RACE, OUTER BEARING 2 9 EM26112 BEARING, OUTER 2 10 EM26110 RACE, INNER BEARING 2 11 EM26108 BEARING, INNER 2 12 EM26109 SEAL, GREASE 2 13 EM16612 LOCK NUT, HEX9/16"-NF 14 14 EM16609 LINK, REAR SHACKLE 4 15 EM508846 WASHER, LOCK 9/16" 8 16 EM16607 SADDLE, SPRING 2 17 EM16608 SPRING, LEAF 2 18 EM966259 SHACKLE BOLT 9/16"-NF 4 19 EM16611 SHACKLE BOLT 9/16"-NF 2 20 EM16608-1 BUSHING, PLASTIC 2 21 EM25611 AXLE 1 22 EM16614 BRAKE ASSY 2 23 EM492451 BOLT, HEX 3/8"-NF 10 24 EM492624 WASHER, 3/8" 10 25 EM492574 NUT, HEX 3/8"/NF 10 26 EM16605 U-BOLT 4

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 71

ST-70 — HYDRAULIC SURGE BRAKE AND HITCH

PAGE 72 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — HYDRAULIC SURGE BRAKE AND HITCH

ST-70 HYDRAULIC SURGE BRAKE AND HITCH

NO. PART NO. PART NAME QTY. REMARKS

1 EM492584 NUT 1/2"-NC HEX. 2 2 EM492626 WASHER, LOCK 1/2" 2

3 EM16602 2" HYDRAULIC SURGE BRAKE ASSY 1 ................. FOR COMPONENTS: CONTACT YOUR

LOCAL ATWOOD DEALER. 4 EM492401 BOLT, HEX. 1/2"-NC x 4" 2

5 EM16116 KIT, BRAKE 1 .................INCLS. ( A, B, C, D, E, F, G) FOR THESE

COMPONENTS. CONTACT YOUR MAYCO

PARTS DEPT. 6 EM16602-1 COVER 1

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 73

SERSER

SER

SERSER

VICEVICE

VICE

VICEVICE

INFORMA INFORMA

INFORMA

INFORMA INFORMA

TIONTION

TION

TIONTION

PAGE 74 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — INTERIOR CONTROL PANEL (Inside Door)

NOTE: ADDITIONAL ILLUSTRATIONS

PAGE 42, 43

430

SW-1

WHITE

-1

-2

PB-1

-3

-4

-1

-2

WHITE

PL2

PL1PL3

-4

-2

SW-2 SW-3

-3

-4

-1

50 55

SW-5

-3

-2

-4

SW-4

-1

-3

-2

SW-6

-4

-1

573748

TO TB1 AND TB2

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 75

FUSE LINK

ST-70 — SCHEMATIC ELECTRICAL CONTROL BOX

SHEET 1 OF 2

TERMINAL STRIP

AND BATTERY WIRES

EXTERNAL HATZ ENGINE

SOL

B+

12 VDC

BATTERY

GND INSIDE BOX

DURING INSTALL

D+

ALT

SOL

STRTR

FU 4

HI THROTTLE

[0]

[22]

[3]

[7]

[1]

[2]

[4]

MAGNET

VALV E

START-STOP

[17]

HYD PRESS

COMPENSATOR

TB1-9, TB1-21,TB1-30 AND TB31

5. HATZ ENGINE (DIESEL) WIRES

6. SPARE TERMINALS

ARE IN [ ] BRACKETS.

TERMINAL STRIP

TB2 = DIODE INTERCONNECT

4. TB1 = SYSTEM INTERCONNECT

PILOT

VALV E

SOL

TB1-9, TB1-21,TB1-30, TB31,

3. UNUSED REF DESIG:.

ENGINE

PROX SW

BLK

AND WIRE NO. 57

SIDE

BLU

2. LAST USED REF DESIG:

BRN

D21, WIRE NO.57

RED = +12 VDC

1. WIRE COLOR CODE:

WHT = 12 VDC GROUND (GND)

BLU

BLK

BLK = ALL OTHERS

PROX SW

BRN

TB1-24

BLK 39

TB1-25

BLK 22

TB1-4

WHT 0

TB1-2

RED 1

TACH

TB1-5

RED 3

TB2-2

D1 (6AMP)

TB2-3

TB1-6

BLK 7

WHT 0

TB2-1

BATTERY

TB2-4

TB1-3

BLK 2

PL3

TB1-8

OIL PRESS

TB1-7

BLK 4

BLK 17

PL1

PL2

AIR FILTER

ENGINE

PUMP

TB1-16

TB1-17

D18

BLK 55

SW3

BLK 52

BLK 53

BLK 44

TB1-1

RUN

BLK 45

SW1

TB1-11

TB1-10

START

RUN

OFF

RED 30RED 51

FU1

FU3

FU2

15A

TB1-18

TB1-19

TB1-20

BLK 35

BLK 36

K3 K4

HOUR

OOOO5

METER

BLK 34

TB1-28

TB2-7

D10

TB2-6

TB1-29

BLK 42

BLK 34

WHT 0

TB2-5

D11

BLK 32

TB1-26

TB1-27

BLK 40

BLK 34

PAGE 76 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SCHEMATIC ELECTRICAL CONTROL BOX

SHEET 2 OF 2

WHT

TB1-12

FAN

OFF

MOTOR

SOL

TEST

BLK 31

TB1-13

D13

SW5

SOL

UNLOAD

TB1-14

BLK 32

PRESS TEST

TB1-15

D14

OFF

PRESS

BLK 33

SOL

TEST

TB1-16

D15

SW2

REV

TB1-22

SOL

TB1-23

D12

REMOTE CONTROL

REV

FWD

PUMPGRN

0FF

REV

SW4

FWD

DIRECTION

BLK 37

BLK 38

CONTROL

OFF

REM

BLK 32

D17

TB2-8

OPERATION

ENG

PUMP

BLK 57

BLK 41

BLK 50

TB2-9

D19

SW6

SW3

(REFER TO LOCATION B7)

D16

TB2-10

WHT

D20

BLK 49

BLK

GRN 56

BLK 48

BLK 32

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 77

ST-70 — INTERCONNECT HYDRAULIC CONTROL BOX

SPARE

BUS BAR

MAYCO WIRING

14 17

13 16

31 33

12 15

SPARE

[0]

PILOT

VALVE

SOL

PILOT

VALVE

SOL

HYD

PRESS

COMP

PRESS

TEST

SOL

UNLOAD

SOL

COOL

FAN

ENG

AIR

MOTOR

OIL

PRES

FILT

GROUND TERMINAL

TB1

SPARE

BRN

BLK

BRN

BLK

25 27

24 26

39 40

BLUE

10 GA RED

PROX SWITCH

ROD -BACK SIDE

PROX SWITCH HEAD -

FRONT SIDE (ENG -SIDE)

SOL

HI THROTTLE

1. HATZ ENGINE WIRES ARE IN [ ] BRACKETS

3. GROUND WIRE SUPPLIED WITH CONTROL

2. ALL MAYCO WIRES ARE CONNECTED TO TB1

PANEL. CONNECTION MADE INSIDE PANEL

TO MOUNTING HARDWARE. SCAPE PAINT

TO ENSURE GROUND INTEGRITY.

NOTES:

10 GA WHITE

5000

4000

LHA

2000

1000

0-5000 PSI

PUMPING

PRESSURE GUAGE

HYD LINE FROM

PUMP PRESS

[3][1] [2]

WIRING

EXISTING HATZ ENGINE

D+

B+

[0] [22]

SOL

ALT

STRTR

037

FUSE

LINK

START - STOP

MAGNETIC VALVE

2500

3000

0 2

1500

LHA

1000

500

ACCUMULATOR

PRESSURE GUAGE

BULKHEAD

0-3000 PSI

FITTINGS

HYD LINE FROM

ACCUM PRESS

ACS SUPPLIED

TB1

PAGE 78 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — HYDRAULIC DIAGRAM

EM97002

EM97026

——EM98005—EM98004—EM97011

EM97013

EM97006

EM97012

—

EM97009

EM97008

EM97015

EM97024

—

EM25425

EM97025

EM97017

—

EM25454

—

———

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 79

ST-70 — OPTIONAL RADIO CONTROL

PAGE 80 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SERVICE INFORMATION

The service procedures contained in this manual are intended for use by an individual equipped with the proper tools and equipment and familiar with safe shop practices.

Should questions arise during the service or repair . . . stop . . . and contact Mayco service department. 1-800-30-MAYCO.

Do not open hydraulic lines or loosen hydraulic fittings while engine is running! Hydraulic fluid under pressure can penetrate the skin, blind, cause burns or create other potentially dangerous hazards follow all safety instructions as described throughout this manual.

Warning! Danger of Amputation!

pressure is in the hydraulic system. Prior to working on the pump, stop the engine by turning off the ignition switch, remove starter key, place a “Do not operate” tag over the switch and disconnect the battery. The pressure reading on the accumulator pressure gauge must read zero. Always relieve the accumulator circuit to zero pressure prior to working on the pump.

Use only original Mayco components. The

quality of the components is critical to the

operator’s safety and performance of the

machine.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 81

Maintenance check schedule

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ST-70 — SERVICE INFORMATION

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1. When changing the hydraulic oil or topping off the reservoir, use only the following type. (Reservoir capacity 58 gal.)

The most important factor to keep in mind is the effect of cold weather on the hydraulic oil. The viscosity (thickness) of the hydraulic oil will be much heavier.

Hydraulic oil: Shell Oil Tellius 68 or

Mobil DFE 26

Always run machine until oil temperature reaches a minimum of 50 degrees F. before pumping. Damage to the main piston

Texaco Rand HDC

pump will occur if the machine is cycled too fast before the oil temperature reaches the minimum of 50 degrees. Cycle the

The Mayco pump is equipped with an in-tank return hydraulic filter with a 10 micron cleanable filter. The element has been designed to remove all particles large enough to cause wear and job break down. Under normal conditions, we recommend replacement every 6 month.

machine at 6-8 strokes per minute at approximately 1/3 throttle. In – areas where the weather normally remains under 50 degrees F., use Shell Oil Tellus – 46, or the equivalent. The above steps must be followed or severe damage to the main axial piston pump will be the end result.

Do not mix oil brands! This may impair quality.

PAGE 82 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SERVICE INFORMATION

2. Lubrication: Grease daily/Hour

■

Main hydraulic cylinders - 2 Place

■

Remix bearings - 2 Place

■

Axle crank - 1 Place

■

Suttle cylinders - 2 Place

■

“S” tube outlet flange - 3 Place

Grease Type: Lithium Based EP

Texaco Multitak 20 Lubriplate ED-2

3. Accumulator: Use dry nitrogen only, never substitute for any other gas!

Contact factory for proper charging procedure.

4. Diesel engine: Refer to engine manufactures instructions.

5. Cylinder lubrication box: Warning

Before checking lubrication level, stop the engine and remove the engine starter key. We recommend using soluble type oil (water & oil mixture). The oil level should be checked everyday prior to pumping. The oil level should be maintained at a height of 5 inches or about ½ the concrete cylinder height.

Important notice! During freezing temperature after pumping, completely drain the water box and cover the hopper. Frozen liquid will restrict the piston travel and cause damage to the pump.

As the rubber piston cups naturally wear, fine cement particles will accumulate in the box. Once the concrete paste reaches a height of about ½ inch from the bottom. The box should be drained and cleaned. To clean, remove the drain plug located at the bottom of the box. Once the box is drained, start the engine and stroke the cylinder (keep hands out of box) ten to fifteen times. While stroking, spray water inside of the box to thoroughly clean out all contamination. When the box is clean replace drain plug, add new lubrication and install the top cover.

Any questions regarding the above mentioned procedure, please call the Mayco Service Department: 1-800-30-MAYCO.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 83

ST-70 — SERVICE INFORMATION

ST70 Pressure Setting Sequence

(Setting maximum pump pressure)

Step 1: Remove acorn nut from pressure compensator (located

on the top front of the Rexroth pump. The compensator is the lower of the two valves) loosen the jam nut and turn the allen screw clockwise until it seats.

Step 2: Loosen the jam nut located on the end of the

compensator valve.

Step 3: Turn the compensator adjustment nut (large) clockwise

until tight.

Step 4: Start the engine, loosen the jam nut located on the

maximum relief valve cartridge, small manifold port 3C. Run engine at maximum Rpm (2350), turn volume control knob counter clockwise to maximum volume position. Locate the electrical control panel, turn the pump switch to the on position, next turn the test switch on. Using an allen wrench adjust the main relief (port 3C) valve to 3500 PSI. The reading can be taken from pump pressure gauge. Hold the allen adjusting bolt with wrench and tighten jam nut. Using the test switch double check the pressure reading to make sure the setting has not changed.

Step 5: Cycle the pump at maximum Rpm’s (2350) at full

volume. Turn maximum pressure test switch on. With an allen wrench adjust compensator allen bolt counter clockwise until (3300) PSI is reached. Lock jam nut and turn maximum pressure test switch off. Let pump cycle 10 or 20 times and turn pressure test switch on to make sure the pump is at maximum pressure. Lock the jam nut.

PAGE 84 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SERVICE INFORMATION

ST-70 Accumulator Circuit

The accumulator circuit has two functions in the hydraulic system.

1. The accumulator circuit furnishes the hydraulic pressure to cycle the shuttle tube.

2. The accumulator circuit also furnishes the pilot pressure necessary to activate the hydraulic system.

The accumulator circuit is equipped with a bladder type accumulator charged with 1100 PSI of dry nitrogen. The accumulator stores one gallon of hydraulic oil, which is, under 1750 PSI of pressure. When the pump cycles, a part of the stored oil is released to the shuttle cylinder, this pressure release assures the shuttle tube has enough force to shear the cylinder of concrete passing from the concrete cylinder to the concrete delivery line during the cycle phase.

Setting pressures in the accumulator circuit

Attach 3000 PSI test gage to port 2-G of the main control block.

Checking accumulator bladder pressure

The accumulator charge pressure should read 1100 PSI. To check pressure, start engine and stroke the pump. The accumulator pressure gauge should read 1750 PSI. To determine the actual accumulator PSI, stop engine and observe the pressure gauge. As the PSI reading slowly decreases it will reach a point where there will be a sudden drop in the PSI. The PSI reading should be taken prior to this sudden drop. If you do not read 1100 PSI the accumulator may require charging or bladder replacement.

Warning – Explosion caused by improper accumulator charging can result in serious injury or death! Never use oxygen or compressed air to charge the accumulator! Only qualified personal should perform this procedure. Use only dry nitrogen to charge the accumulator. Contact your Mayco service department or your local Hydac representative for proper charging procedure.

(Pressure test gauge Mayco P/N 98016)

The unloading valve cartridge, located in port 4-E, loosen lock nut and with an allen wrench turn adjusting screw clockwise until it is completely closed.

Turn the pump switch and run engine at 2350 Rpm’s and adjust the accumulator circuit pilot relief valve cartridge, located at port 4-G. Loosen lock nut, turn allen adjusting screw until pressure gauge reads 1950 PSI, and tighten lock nut. Turn engine off and on several times to make the pressure continues to read 1950 PSI. With relief valve set at 1950 PSI it is time to adjust the unloading cartridge. Turn on pump and run at 2350 Rpm’s and maximum volume. Using the accumulator pressure gauge located by control panel, adjust unloading valve cartridge counter clockwise until the pressure reaches 1750 PSI. Start and stop pump several times to make sure accumulator circuit pressure is holding at 1750 PSI. At this time tighten lock nut on unloading valve cartridge. Your accumulator circuit pressure should now be properly adjusted.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 85

ST-70 — SERVICE INFORMATION

Hydraulic system trouble shooting

Problem

No hydraulic oil flow from axial piston pump.

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Problem

Drive cylinders will not cycle.

Problem

Accumulator pressure drops to zero on every cycle

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Problem

Accumulator pressure is below 1750 PSI.

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Problem

Accumulator pressure not discharging when switch is turned off.

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PAGE 86 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

ST-70 — SERVICE INFORMATION

Electrical System

Proximity switches

Electrical

Problem

When starter switch is activated and nothing occurs.

The proximity is a normally open switch. The proximity develops a radio frequency, which is emitted from the face of the proximity switch. As the hydraulic drive cylinder piston passes through the radio frequency, the circuit closes and a signal is sent to the pilot cycle valve. This valve cycles the pump and causes the concrete to flow.

Problem

Hatz engine will not continue to run after key is released.

This proximity switch is designed to work at hydraulic pressures

of 5000 PSI and oil temperatures of 250

Problem

At the completion of a pumping stroke the pumping pressure

Fahrenheit.

Problem

Hatz engine will not start.

gauge indicates high pressure and the pump doesn’t cycle.

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Problem

Engine runs, no power to circuits #32-47.

Problem

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If the emergency cycle switch doesn’t cycle the pump it may

on.

well be a problem with the K-4 relay. A quick check for a problem with the K-4 relay is to use a hot jumper wire. Connect (jumper wire) to terminals #35 and #36 on terminal block #1. When contact is made between these two terminals and the pump

Hatz engine will not increase Rpm’s when the pump is turned

cycles. This would indicate that you have a faulty K-4 relay.

Problem

The pump will not reverse in Remote Control.

Problem

Engine oil pressure light will not go out.

Problem

Battery charge light won’t turn off.

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ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 87

ST-70 — SERVICE INFORMATION

Changing the concrete cylinder piston cups

The Rubber piston cups will occasionally require replacement depending on the following factors.

■

The fluid level and cleanliness of the lubrication box.

■

The size and type of aggregate.

■

The type of concrete being pumped.

It is time to replace the cups when increasingly large particles of sand and cement pass into the lubrication box. Do not allow the cups to become so worn that they begin to pass lubrication into the material cylinders. If the liquid level of the lubrication box becomes to low, the rubber cups will severely deform due to excessive heat. Whenever replacement is due, both cylinder cups should be replaced.

The following procedure should be used to replace the rubber cups and felt rings.

Warning! Danger of Amputation!

The Mayco pump is equipped with a nitrogen accumulator, which stores hydraulic energy. You will be required to put your hand in the concrete cylinders or near the suttle. You are at extreme risk if the engine is running or if pressure is in the hydraulic system. Prior to working on the pump, stop the engine by turning off the ignition switch, remove starter key, place a “Do not operate” tag over the switch and disconnect the battery. The pressure reading on the accumulator pressure gauge must read zero. Always relieve the accumulator circuit to zero pressure prior to working on the pump.

Replacement procedure

Step 5: Start engine and turn on pressure test switch, cycle

Step 6: At this time remove the three 3/8 – 16 x 3” bolts P/N

Step 7: Next, install two the 3/8’ 16x3” bolts P/N 492388 back

Step 8: Reassemble – obtain two 3/8 16x7” full thread studs

Step 9: The new “O” ring P/N 14407 must now be modified.

Step 10: Install “O” Ring P/N 14407 around oiler plate P/N

Step 11: Install the felt holder P/N 16462 over the oiler plate.

pump in reverse until hydraulic system obtains maximum pressure, at this point turn pump and engine off. Remove ignition key and disconnect battery. Think safety! Check the hydraulic gauges on panel and make sure accumulator pressure reads zero. The one piston should be in the fully discharge position at the end of the concrete cylinder.

492388 from the piston. Remove the front faceplate P/ N 16464.

into the piston – do not tighten. Use the two bolts as leverage to remove the rubber piston cup and rear components.

(these studs will be used to assist in assembly alignment) insert the two studs into the piston adapter P/N 16460. Coat the concrete cylinder with grease.

Using a sharp knife cut four oil passage grooves into the ring. the grooves should be placed at a distance of

apart. The cut should be a v-shaped design, 0.059”

90 deep and 0.157” wide at the top.

16461. Install plate into concrete cylinder utilizing the studs for alignment.

Install felt ring P/N 16462 into felt holder. Note: felt ring must be saturated with 30 wt. oil prior to installation. Install bronze ring P/N 14408.

Step 1: Remove and plug the two hydraulic hoses connected

to the remix motor. P/N 25425.

Step 2: Remove the hopper discharge nipple P/N 25836 and

loosen sleeve seal P/N 16819 inspect and replace if wear is excessive.

Step 3: Remove the two tie rod nuts P/N 16166 and the four

eyebolt nuts P/N 452558.

Step 4: With lifting device; remove hopper P/N 25174 use

extreme care not to damage the hopper seal P/N 16184.

Step 12: Using silicon sealant place a small bead of sealant

Step 13: Insert one 3/8” 16x3” bolt P/N 492388 into the open

Note: Before installing 3/8” bolt, coat the back of bolt heads with silicon sealant. Torque all three bolts equal at 55 ft. lbs. each.

PAGE 88 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

material on the front of the rubber piston P/N 16463 and the rear of the face plate P/N 16464. Install over alignment studs and into concrete cylinders.

bolt hole, remove alignment studs one at a time and install the remaining 3/8” 16x3” bolts.

ST-70 — SERVICE INFORMATION

Changing the wear plate and ring

Due to the swinging motion of the Nun-plate and the abrasive nature of concrete it is normal for the cutting ring to wear on the side that shears through the concrete inside the hopper. If the wear ring and wear plate do not fully seat against each other. The concrete slurry will pump into the hopper. This condition can be easily observed by the sudden change of the level of concrete inside the hopper during each stroke.

Warning! Danger of Amputation!

Replacement procedure

Step 6: Clean out all concrete build up in and around the nun-

Step 7: Inspect the wear components for indications of wear.

Step 8: Wear plate installation: install the two cylinder “O” rings

Step 9: Wear ring installation: Install the wear ring P/N 16171

plate area with a wire brush.

Note: it is typical that the wear plate P/N 25841 will have two times the service life compared to the cutting ring. The wear plate has two wear surfaces. If it becomes necessary to replace, the plate can be reversed to the opposite side to expose a new flat surface. To replace or reverse the plate, remove the five allen head counter suck bolts. Next remove the two cylinder “O” rings and clean the entire back surface.

P/N 16174. Using silicon sealant, coat the circumference of the concrete cylinders, wear plate back and around the five bolt holes. Next, install the wear plate and the five bolts. Note: the bolts must all be equally snugged and tightened to 100 foot pounds each.

into the nun plate. Install the insert ring P/N 16812-2 inside of the rubber energizer ring P/N 16816-1. Install the energizer ring assembly into the nun-plate.

Step 1: Remove and plug the two hydraulic hoses connected

to the remix motor P/N 25425.

Step 2: Remove the hopper discharge nipple P/N 25836 and

loosen sleeve seal P/N 16819 inspect and replace if wear is excessive.

Step 3: Remove the two tie rod nuts P/N 16166 and the four

eyebolts nuts P/N 452558.

Step 4: With a lifting devise, remove hopper P/N 25174 use

extreme care nut to damage the hopper seal P/N 16184.

Step 5: Remove the four 5/8”-11 1 ½ “ bolts that hold the suttle

tube to the nun-plate and remove suttle tube. The energizer ring and wear ring will normally have concrete contamination holding them in position. It will be required to chip some of the concrete loose to better expose the energizer ring. Using two small pry bars remove the energizer ring P/N 16816-1, insert ring P/N 16816-2 and wear ring P/N 16171.

After installing the above mentioned components the machine can be re-assembled by reversing steps 1 through 5.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 89

ST-70 — SERVICE INFORMATION

Wheel Bearings

Problem

Brake overheating, side pull, brakes do not operate, poor brake

After every 6 months of operation inspect the wheel bearings.

performance.

Once a year, or when required, disassemble the wheel hubs remove the old grease and repack the bearings forcing grease between rollers, cone and cage with a good grade of high speed wheel bearing greases (never use grease heavier than 265 A.S.T.M. penetration “No. 2.”). Fill the wheel hub with grease to the inside diameter of the outer races and also fill the hub grease cap. Reassemble the hub and mount the wheel. Then tighten the adjusting nut, at the same time turn the wheel in both directions, until there is a slight bind to be sure all the bearing

surfaces are in contact. Then back off the adjusting nut

/6 to ¼ turn or to the nearest locking hole or sufficiently to allow the wheel to rotate freely within limits of .001” to .010” end play. Lock the nut at this position. Install the cotter pin and dust cap, and tighten all hardware.

.elbac

Brake system

The brake system should be periodically checked. Look for fluid leaks worn or cracked hoses. Check the reservoir for proper fluid levels. The Atwood surge brake should be checked for damage. Make sure that all links and pivots are kept lubricated.

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Problem

Squeaking, chatter or chucking.

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PAGE 90 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

Effective: February 22, 2006

TERMS AND CONDITIONS OF SALE — PARTS

PAYMENT TERMS

Terms of payment for parts are net 30 days.

FREIGHT POLICY

All parts orders will be shipped collect or prepaid with the charges added to the invoice. All shipments are F.O.B. point of origin. Multiquip’s responsibility ceases when a signed manifest has been obtained from the carrier, and any claim for shortage or damage must be settled between the consignee and the carrier.

MINIMUM ORDER

The minimum charge for orders from Multiquip is $15.00 net. Customers will be asked for instructions regarding handling of orders not meeting this requirement.

RETURNED GOODS POLICY

Return shipments will be accepted and credit will be allowed, subject to the following provisions:

1. A Returned Material Authorization must be approved by Multiquip prior to shipment.

2. To obtain a Retur n Material Authorization, a list must be provided to Multiquip Parts Sales that defines item numbers, quantities, and descriptions of the items to be returned.

a. The parts numbers and descriptions

must match the current parts price list.

b. The list must be typed or computer

generated.

c. The list must state the reason(s) for

the return.

d. The list must reference the sales

order(s) or invoice(s) under which the items were originally purchased.

e. The list must include the name and

phone number of the person requesting the RMA.

3. A copy of the Return Material Authorization must accompany the return shipment.

4. Freight is at the sender’s expense. All parts must be returned freight prepaid to Multiquip’s designated receiving point.

5. Parts must be in new and resalable con-

6. The following items are not returnable:

7. The sender will be notified of any material

8. Such material will be held for five working

9. Credit on returned parts will be issued at

10. In cases where an item is accepted, for

11. Credit issued will be applied to future

PRICING AND REBATES

Prices are subject to change without prior notice. Price changes are effective on a specific date and all orders received on or after that date will be billed at the revised price. Rebates for price declines and added charges for price increases will not be made for stock on hand at the time of any price change.

Multiquip reserves the right to quote and sell dition, in the original Multiquip package (if any), and with Multiquip part numbers clearly marked.

a. Obsolete parts. (If an item is in the

price book and shows as being replaced by another item, it is obsolete.)

b. Any parts with a limited shelf life

(such as gaskets, seals, “O” rings, and other rubber parts) that were purchased more than six months prior to the return date.

c. Any line item with an extended dealer

net price of less than $5.00.

d. Special order items. e. Electrical components.

f. Paint, chemicals, and lubricants.

g. Decals and paper products.

h. Items purchased in kits.

received that is not acceptable.

days from notification, pending instructions. If a reply is not received within five days, the material will be returned to the sender at his expense.

dealer net price at time of the original purchase, less a 15% restocking charge.

which the original purchase document can not be determined, the price will be based on the list price that was effective twelve months prior to the RMA date.

purchases only.

direct to Government agencies, and to Original

Equipment Manufacturer accounts who use

our products as integral parts of their own

products.

SPECIAL EXPEDITING SERVICE

A $35.00 surcharge will be added to the invoice

for special handling including bus shipments,

insured parcel post or in cases where Multiquip

must personally deliver the parts to the carrier.

LIMITATIONS OF SELLER’S LIABILITY

Multiquip shall not be liable hereunder for

damages in excess of the purchase price of the

item with respect to which damages are

claimed, and in no event shall Multiquip be

liable for loss of profit or good will or for any

other special, consequential or incidental dam-

ages.

LIMITATION OF WARRANTIES

No warranties, express or implied, are made

in connection with the sale of parts or trade

accessories nor as to any engine not manufac-

tured by Multiquip. Such warranties made in

connection with the sale of new, complete units

are made exclusively by a statement of war-

ranty packaged with such units, and Multiquip

neither assumes nor authorizes any person to

assume for it any other obligation or liability

whatever in connection with the sale of its

products. Apart from such written statement of

warranty, there are no warranties, express,

implied or statutory, which extend beyond the

description of the products on the face hereof.

ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 91

PARTS AND OPERATION MANUAL

HERE'S HOW TO GET HELP

PLEASE HAVE THE MODEL AND SERIAL

NUMBER

ON-HAND

WHEN CALLING

UNITED STATES

Multiquip Corporate Office MQ Parts Department

18910 Wilmington Ave. Tel. (800) 421-1244 800-427-1244 Fax: 800-672-7877 Carson, CA 90746 Fax (800) 537-3927 310-537-3700 Fax: 310-637-3284 Contact: mq@multiquip.com

Mayco Parts Warranty Department

800-306-2926 Fax: 800-672-7877 800-421-1244, Ext. 279 Fax: 310-537-1173 310-537-3700 Fax: 310-637-3284 310-537-3700, Ext. 279

Service Department Technial Assistance

800-421-1244 Fax: 310-537-4259 800-478-1244 Fax: 310-631-5032 310-537-3700

MEXICO UNITED KINGDOM

MQ Cipsa Multiquip (UK) Limited Head Office

Carr. Fed. Mexico-Puebla KM 126.5 Tel: (52) 222-225-9900 Hanover Mill, Fitzroy Street, Tel: 0161 339 2223 Momoxpan, Cholula, Puebla 72760 Mexico Fax: (52) 222-285-0420 Ashton-under-Lyne, Fax: 0161 339 3226 Contact: pmastretta@cipsa.com.mx Lancashire OL7 0TL

Contact: sales@multiquip.co.uk

CANADA BRAZIL

Multiquip Multiquip

4110 Industriel Boul. Tel: (450) 625-2244 Av. Evandro Lins e Silva, 840 - grupo 505 Tel: 011-55-21-3433-9055 Laval, Quebec, Canada H7L 6V3 Fax: (450) 625-8664 Barra de Tijuca - Rio de Janeiro Fax: 011-55-21-3433-9055

Contact: jmartin@multiquip.com Contact: cnavarro@multiquip.com.br, srentes@multiquip.com.br

Multiquip Inc, the MQ logo and the Mayco logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or altered without written permission. All other trademarks are the property of their respective owners and used with permission.

This manual MUST accompany the equipment at all times. This manual is considered a permanent part of the equipment and should remain with the unit if resold.

The information and specifications included in this publication were in effect at the time of approval for printing. Illustrations are based on the

Concrete Pump.

Inc. reserves the right to discontinue or change specifications, design or the information published in this publication at any time without notice and without incurring any obligations.

Illustrations, descriptions, references and technical data contained in this manual are for guidance only and may not be considered as binding. Multiquip

MQ-Mayco ST-70 Structural

Your Local Dealer is:

Multiquip ST70 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual