Multiquip MC-42S User Manual

OPERATION AND PARTS MANUAL

MC-42S

CONCRETE MIXER

FINAL REVISION

© COPYRIGHT 2004, MULTIQUIP INC.

Revision #8 (12/16/05)

MULTIQUIP INC

18910 WILMINGTON AVE. 800-427-1244
CARSON, CALIFORNIA 90746 FAX: [phone]
310-537-3700
800-421-1244 800-478-1244
FAX: [phone] FAX: [phone]

E-mail:[e-mail] • www:multiquip.com

Atlanta • Boise • Dallas • Houston • Newark
Montreal, Canada • Manchester, UK
Rio De Janiero, Brazil • Guadalajara, Mexico

..

. PARTS DEPARTMENT:

..

SERVICE DEPARTMENT/TECHNICAL ASSISTANCE:

HERE'S HOW TO GET HELP

PLEASE HAVE THE MODEL AND SERIAL

NUMBER

MULTIQUIP’S MAIN PHONE NUMBERS

800-421-1244 FAX: [phone]
310-537-3700

PARTS DEPARTMENT

800-427-1244 FAX: [phone]
310-537-3700 FAX: [phone]

MAYCO PARTS

800-306-2926 FAX: [phone]
310-537-3700 FAX: [phone]

SERVICE DEPARTMENT

800-478-1244 FAX: [phone]
310-537-3700

MQ POWER SERVICE DEPARTMENT

800-835-2551 FAX: [phone]

ON-HAND

WHEN CALLING

310-537-3700

TECHNICAL ASSISTANCE

800-478-1244 FAX: [phone]

WARRANTY DEPARTMENT

800-421-1244, EXT. 279 FAX: [phone]
310-537-3700, EXT. 279

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 3

MC-42S CONCRETE MIXER — TABLE OF CONTENTS

Multiquip MC-42S Concrete
Mixer

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

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

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

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

Dimensions (Mixer) ................................................... 7

Safety Message Alert Symbols ................................. 8

Rules For Safe Operation .................................... 9-10

Operation and Safety Decals .................................. 11

General Information ................................................ 12

Mixer Basic Components ........................................ 13

Basic Engine Components ...................................... 14

Handwheel Assembly .............................................. 15

Towing Guidelines ................................................... 16

Safety Chain Connection ........................................ 17

Electric Motor ..................................................... 18-19

Pre-Inspection (Gasoline Engine) ........................... 20

Initial Start-up (Gasoline Engine) ............................ 21

Initial Start-up (Electric Motor) ................................ 22

Operation ................................................................ 23

Maintenance (Engine)........................................ 24-25

Maintenance (Mixer) .......................................... 26-28

Troubleshooting (Engine) ........................................ 30

Troubleshooting (Engine/Mixer) .............................. 31

Explanation Of Code In Remarks Column .............. 32

Suggested Spare Parts ........................................... 33

Componet Drawings

Nameplate and Decals....................................... 34-35

Mixer Assembly (Steel Drum) ............................ 36-37

Mixer Assembly (Plastic Drum) .......................... 38-39

Main Frame Assembly ....................................... 40-41

Axle Assembly .................................................... 42-43

Cabinet Assembly .............................................. 44-45

Gas Engine Mounting Plate Asasembly ............ 46-47

Electric Motor Mounting Plate Asasembly ........ 46-47

HONDA GX120K1QX2 ENGINE

Air Cleaner Assy................................................. 48-49

Camshaft Assy. .................................................. 50-51

Carburetor Assy. ................................................ 52-53

Control Assy. ...................................................... 54-55

Crankcase Cover Assy. ...................................... 56-57

Crankshaft Assy. ................................................ 58-59

Cylinder Barrel Assy. .......................................... 60-61

Cylinder Head Assy. ........................................... 62-63

Fan Cover Assy. .................................................64-65

Flywheel Assy..................................................... 66-67

Fuel Tank Asssembly ......................................... 68-69

Ignition Coil Asssembly ...................................... 70-71

Muffler Asssembly .............................................. 72-73

Piston Rings Asssembly ..................................... 74-75

Recoil Starter Asssembly ................................... 76-77

Gasket Kit Assembly .......................................... 78-79

Labels Asssembly .............................................. 80-81

Terms and Conditions of Sale - Parts ................... 82

NOTE

PAGE 4 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

Specification and part number
are subject to change without
notice.

MC-42S CONCRETE MIXER — PARTS ORDERING PROCEDURES

When ordering parts,

please supply the following information:

❒❒

❒ 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

❒❒
❒❒

❒ Specify preferred method of shipment:

❒❒

✓ FedEx or UPS Ground
✓ FedEx or UPS Second Day or Third Day
✓ FedEx or UPS Next Day
✓ Federal Express Priority One
✓ DHL
✓ Tr u ck

Here’s how to get help...

Please have the model and serial number on
hand when calling.

Note: Unless otherwise indicated by customer, all
orders are treated as “Standard Orders”, and will
ship within 24 hours. We will make every effort to
ship “Air Shipments” the same day that the order is
received, if prior to 2PM west coast time. “Stock
Orders” must be so noted on fax or web forms.

Place Your Parts Order Via Web or Fax

For Even More Savings!

Parts Department

800-427-1244 Fax: [phone]

310-537-3700 Fax: [phone]

Service Department

800-478-1244 Fax: [phone]

310-537-3700

Technical Assistance

800-478-1244 Fax: [phone]

Warranty Department

800-421-1244, Ext. 279 Fax: [phone]

310-537-3700, Ext. 279

Sales Department

310-661-4242 Fax: [phone]

877-289-7869 (877-BUY-STOW)

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

A DIVISION OF STOW INC.

POST OFFICE BOX 6254

CARSON, CA 90749
310-537-3700 • 888-252-STOW [888-252-7869]
FAX: [phone] • FAX: [phone]
E-MAIL: [e-mail] • WWW: stowmfg.com

Extra Discounts!

All parts orders which include complete part numbers
and are received by our automated web parts order
system, or by fax qualify for the following extra
discounts:

Ordered Standard Stock orders

via orders ($750 list and above)

Fax 3% 10%

Web 5% 10%

Special freight allowances
when you order 10 or more
line items via Web or Fax!**

FedEx Ground Service

No other allowances on freight shipped by any other
carrier.

NOTE: DISCOUNTS ARE SUBJECT TO CHANGE

at no charge for freight

Direct TOLL-FREE access

to our Parts Department:

Toll-free nationwide — 800-427-1244

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 5

MC-42S CONCRETE MIXER — SPECIFICATIONS

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PAGE 6 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

See Table 2 for mixer dimensions

MC-42S CONCRETE MIXER — DIMENSIONS (MIXER)

Figure 1A. Mixer Dimensions

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 7

MC-42S CONCRETE MIXER — SAFETY MESSAGE ALERT SYMBOLS

FOR YOUR SAFETY AND THE SAFETY OF OTHERS!

Safety precautions should be followed at all times when
operating this equipment. Failure to read and understand the
Safety Messages and Operating Instructions could result in
injury to yourself and others.

This Owner's Manual has been
developed to provide complete
instructions for the safe and efficient

NOTE

operation of the Multiquip

MC-42S (Steel) Concrete Mixer.

Before using this mixer,
ensure that the operating
individual has read and
understands all instructions in
this manual.

Model

HAZARD SYMBOLS

SAFETY MESSAGE ALERT SYMBOLS

The three (3) Safety Messages shown below will inform you
about potential hazards that could injure you or others. The
Safety Messages specifically address the level of exposure to
the operator, and are preceded by one of three words: DANGER,

WARNING, or CAUTION.

Rotating Parts

NEVER operate equipment with covers, or

guards removed. Keep fingers, hands, hair and
clothing away from all moving parts to prevent
injury.

Accidental Starting

ALWAYS place the circuit breaker or power

ON/OFF switch in the OFF position when the
pump is not in use.

Sight and Hearing hazard

ALWAYS wear approved eye and hearing

protection.

DANGER: You WILL be KILLED or

SERIOUSLY injured if you do not follow
directions.

WARNING: You CAN be KILLED or

SERIOUSLY injured if you do not follow
directions.

CAUTION: You CAN be injured if you

do not follow directions.

Potential hazards associated with the Multiquip MC-42S concrete
mixer operation will be referenced with Hazard Symbols which
appear throughout this manual, and will be referenced in
conjunction with Safety Message Alert Symbols.

Other important messages are provided throughout this manual
to help prevent damage to your mixer, other property, or the
surrounding environment.

NOTE

Respiratory Hazard

ALWAYS wear approved respiratory

protection.

Equipment Damage Messages

This mixer, other property, or the
surrounding environment could
be damaged if you do not follow
instructions.

PAGE 8 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — RULES FOR SAFE OPERATION

■

DANGER:

Failure to follow instructions in this manual may

lead to serious injury or even death! This
equipment is to be operated by trained and
qualified personnel only! This equipment is for
industrial use only.

The following safety guidelines should always be used when
operating the

GENERAL SAFETY

■

DO NOT operate or service this equipment before
reading this entire manual.

■

This equipment should not be operated by
persons under 18 years of age.

■

NEVER operate this equipment without proper
protective clothing, shatterproof glasses, steel­toed boots and other protective devices required
by the job.

■

NEVER operate this equipment when not feeling
well due to fatigue, illness or taking medicine.

Multiquip MC-42S Concrete Mixer:

NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to
cool before servicing engine or mixer.

■

High Temperatures – Allow the engine to cool before adding
fuel or performing service and maintenance functions. Contact

hot

with

■

The engine of this mixer requires an adequate free flow of
cooling air.

components can cause serious burns.

NEVER!

operate the mixer in any enclosed or

narrow area where free
flow of the air is restricted. If
the air flow is restricted it
will cause serious damage
to the mixer or engine and
may cause injury to people
and property. Remember
the mixer's engine
(gasoline models only)
gives off DEADLY gases.

■

NEVER operate this equipment under the
influence or drugs or alcohol.

■

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.

■

ALWAYS check the machine for loosened threads or bolts
before starting.

■

ALWAYS wear proper respiratory (mask) hearing and eye
protection equipment when operating the mixer.

■

NEVER!

rotating.

place hands inside the drum while the drum is

■

ALWAYS refuel in a well-ventilated area, away from sparks
and open flames.

■

ALWAYS use extreme caution when working with flammable
liquids. When refueling, stop the engine and allow it to cool.

DO NOT

could result from fuel vapors, or if fuel is spilled on a hot
engine.

■

NEVER operate the mixer in an explosive
atmosphere or near combustible
materials. An explosion or fire could result
causing severe

smoke around or near the machine. Fire or explosion

bodily harm or even

death.

■

Topping-off to filler port is dangerous, as it tends to spill fuel.

■

Refer to the
questions or information.

■

NEVER use accessories or attachments, which are not
recommended by Multiquip for this equipment. Damage to
the equipment and/or injury to user may result.

■

Manufacturer does not assume responsibility for any accident
due to equipment modifications.

Engine Owner's Manual

for engine technical

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 9

MC-42S CONCRETE MIXER — RULES FOR SAFE OPERATION

■

NEVER run engine without air cleaner. Severe engine damage

may occur.

■

ALWAYS read, understand, and follow procedures in
Operator’s Manual before attempting to operate equipment.

■

ALWAYS be sure the operator is familiar with proper safety
precautions and operations techniques before using roller.

■

ALWAYS store equipment properly when it is not being used.
Equipment should be stored in a clean, dry location out of the
reach of children.

■

NEVER leave the mixer unattended, turn off engine or electric
motor when unattended.

■

CAUTION must always be observed while servicing this mixer.
Rotating parts can cause injury if contacted.

■

Unauthorized equipment modifications will void all
warranties.

■

Ensure that any extension cable is protected against damage
and not liable to be tripped over or trapped underneath the
mixer.

■

DO NOT allow extension cord to come into contact with water
or fluids.

■

DO NOT spray water onto electric motor.

■

This mixer is intended for the production of concrete. Mixer
must be used only for its intended purpose.

■

This mixer is not suitable for the mixing of

explosive

■

NEVER operate the mixer in an

■

Before starting the mixer, check that all
and correctly fitted.

substances.

explosive

flammable

atmosphere.

guards

are in position

■

■

■

Maintenance Safety

■

■

■

■

■

■

■

or

Emergencies

■

NEVER disconnect any

These devices are intended for operator safety. Disconnection
of these devices can cause severe injury, bodily harm or even
death! Disconnection of any of these devices will void all
warranties.

If mixer is equipped with an electric motor, operate electric
motor only at the specified voltage indicated on the nameplate.

Make sure the

always

plug into an AC receptacle (electric model only).

NEVER lubricate components or attempt service on a running
machine.

ALWAYS allow the machine a proper amount of time to cool

before servicing.
Keep the machinery in proper running condition.
Fix damage to the machine immediately and always replace

broken parts, or missing decals.
Dispose of hazardous waste properly. Examples of potentially

hazardous waste are used motor oil, fuel and fuel filters.
DO NOT use food or plastic containers to dispose of

hazardous waste.
DO NOT pour waste, oil or fuel directly onto the ground,

down a drain or into any water source.

ALWAYS know the location of the nearest

and first aid kit.

in the

OFF/ON

OFF

"emergency or safety devices"

power switch on the electric motor is

position before inserting the mixer's power

.

fire extinguisher

■

Keep area around the mixer
could cause persons to fall onto

■

ALWAYS ensure mixer is on level ground before mixing.

■

Become familiar with the controls of the mixer before
operating.

■

ALWAYS replace any worn or damaged warning decals.

■

Ensure the drum is
drum.

■

ALWAYS disconnect AC power plug from power source
before moving mixer (electric model only).

■

High Temperatures – Always stop engine and allow the
engine to cool before adding fuel, oil or performing service
and maintenance functions. Contact with
can cause serious burns.

PAGE 10 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

rotating

clear of obstructions

moving parts

while filling and emptying the

hot

which

.

■

components

In emergencies

nearest phone or
Also know the phone numbers of the nearest

ambulance, doctor

information will be invaluable in the case of an
emergency.

always

know the location of the

keep a phone on the job site

and

fire department

.

. This

MC-42S CONCRETE MIXER — OPERATION AND SAFETY DECALS

Machine Safety Decals

The Multiquip MC-42S mixer is equipped with a number of safety decals (Figure 1A). These decals are provided for operator safety
and maintenance information. The illustration below and on the next page shows these decals as they appear on the machine.
Should any of these decals become unreadable, replacements can be obtained from your dealer.

Figure 1A. MC-42S Mixer Decals

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 11

MC-42S CONCRETE MIXER — GENERAL INFORMATION

Application

This mixer is

only

intended for the production of

concrete

The mixer must be used for its intended purpose and is not
suitable for the mixing of
substances. The mixer

flammable

must not be used

or

in an explosive

explosive

atmosphere. Use Table 4 (Mixing Hints) as a guide when
mixing concrete for various applications.

Power Plants

The MQ Whiteman mixer can be powered by either a Honda
GX120K1QX2 air-cooled, 4-stroke

gasoline engine or a 1/2

HP electric motor. Refer to Table 1 to for specific engine or
electric motor data information.

Electrical

If mixer is equipped with an

electric motor

, make sure that

Ensure that the extension cable is carefully laid out avoid-

wet areas, sharp edges

ing

.

might run over it. Avoid allowing the extension cable to be
trapped underneath the mixer.

Unroll the extension cable fully or it will overheat and could
catch fire. Make sure that all extension cable connections
are dry and safe. Replace any defective or badly worn ex­tension cable immediately.

Hardware

Check all hardware on the mixer before starting. Periodically
inspect all hardware. Loose hardware can contribute to early
component failure and poor performance. Use Table 3 as general
guideline when the torqueing of mixer hardware is required.
Remember to keep all mixer hardware components tight.

the power being supplied to the motor corresponds to the
voltage rating label on the motor. Supplying the wrong voltage
to the electric motor will cause severe electrical damage to
the motor.

Always make sure the
is in the

It is

OFF

position before applying power.

strongly recommended

power cord into a receptacle, that a G.F.C.I. (

Current Interrupter

OFF/ON

switch on the electric motor

when inserting the mixer's

Ground Fault

) receptacle be used (115 VAC

applications).

Extension Cables

and locations where vehicles

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The extension cable should be a 3-wire configuration that
includes a ground wire that conforms to UL code. The wire
cross section must be a minimum of 2.5 mm

2

. Choose an
extension cord of adequate current carrying as Referenced
in Table 6. Remember

distance

affects the wire size of the

Engine Maintenance

For basic engine maintenance, refer to the engine maintenance
section in this manual. For a more detailed engine maintenance,
refer to the
engine.

extension cable.

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PAGE 12 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

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MC-42S CONCRETE MIXER — MIXER BASIC COMPONENTS

Figure 2. Mixer Major Components

1. Steel Mixing Drum — The Multiquip MC-42S uses a 4
cu. ft

steel

mixing drum. This drum is to be used for mixing
of concrete. Always clean the drum after each use. DO
NOT use this mixing drum for the mixing of volatile liquids.

2. Dump Latch — To rotate the mixing drum, this latch must
be in the up position. To lock the drum, place the latch in the
down position.

3. Dump Gear Guard — NEVER operate the mixer with this
guard removed. Its purpose is to prevent dirt and debris
from entering the dump gear. In addition operator clothing
could become entangled in the dump gear, causing severe
injury and bodily harm.

4. Handwheel — Turn this wheel clockwise or counter­clockwise to rotate the mixing drum. Remember the dump
latch must be in the
drum to be rotated.

5. Zerk Fittings — There is, at the bottom and engine side
of the yoke, and center of the
fittings. Lubricate these fittings as referenced in the
maintenance section of this manual.

6. Safety Chain — This mixer uses a 3/16-inch thick, 72­inches long zinc-plated saftey chain.
safety chain when towing.

up position

in order for the mixing

handwheel

grease zerk

ALWAYS

connect the

8. Leaf Suspension — This mixer uses a leaf type

9. Chock Blocks — Place these blocks (not included as

10. Tires Ply — The tire ply (layers) number is rated in letters;

11. ON/OFF Switch (gasoline only) — This switch is provided

12. Cabinet/Latch — Encloses engine and electric motor.

13. Mixing Blades (Steel) — Used for the mixing of concrete.

suspension. Check the mounting hardware for bolt hole
elongation and tightness. See maintenance section of this
manual for recommended maintenance.

part of the mixer package) under each mixer wheel to
prevent rolling, when mixer is not connect to the towing
vehicle.

This mixer uses 13-inch 2-ply tires. Replace with only
recommended type tires.

on

mixerwith gasoline

side of the mixer frame. When activated it will shut down
the engine. Pull out when starting the engine.

NEVER run mixer with cabinet removed. Use latches to
secure engine compartment cabinet.

When blades show signs of wear, entire steel mixing drum
assembly must be replaced. See steel mixing drum
assembly in the parts section of this manual.

engines only and is located on the

7. Tow Bar — This mixer uses various towing bars, please
reference the frame assembly drawing and parts list in this
manual to determine which tow bar meets your
requirements.

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 13

MC-42S CONCRETE MIXER — BASIC ENGINE COMPONENTS

Honda GX Series Engine Shown

Figure 3. Engine Controls and Components

INITIAL SERVICING

The engine (Figure 3) must be checked for proper lubrication and
filled with fuel prior to operation. Refer to the manufacturers Engine
manual for instructions & details of operation and servicing.

1. Fuel Filler Cap – Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.

5. Fuel Valve Lever – OPEN to let fuel flow, CLOSE to stop
the flow of fuel.

6. Choke Lever – Used in the starting of a cold engine, or in
cold weather conditions. The choke enriches the fuel
mixture.

7. Air Cleaner – Prevents dirt and other debris from entering
the fuel system. Remove wing-nut on top of air filter
cannister to gain access to filter element.

WARNING

WARNING

Adding fuel to the tank should be accomplished only
when the engine is stopped and has had an

opportunity to cool down. In the event of a fuel spill,
DO NOT attempt to start the engine until the fuel residue has been
completely wiped up, and the area surrounding the engine is dry.

2. Throttle Lever – Used to adjust engine RPM speed (lever

advanced forward

FAST

).

3. Engine ON/OFF Switch – ON position permits engine

starting, OFF position stops engine operations.

4. Recoil Starter (pull rope) – Manual-starting method. Pull

the starter grip until resistance is felt, then pull briskly and
smoothly.

SLOW

, lever back toward operator

8. Spark Plug – Provides spark to the ignition system. Set
spark plug gap to 0.6 - 0.7 mm (0.028 - 0.031 inch). Clean
spark plug once a week.

9. Muffler – Used to reduce noise and emissions.

while the engine is running or immediately after operating. NEVER
operate the engine with the muffler removed.

10. Fuel Tank – Holds unleaded gasoline. For additional
information refer to engine owner's manual.

NOTE

Operating the engine without an air filter,
with a damaged air filter, or a filter in need of
replacement will allow dirt to enter the
engine, causing rapid engine wear.

WARNING

Engine components can generate extreme heat.
To prevent burns, DO NOT touch these areas

PAGE 14 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — HANDWHEEL ASSEMBLY

Assembly

The Multiquip MC-42S concrete mixer is shipped with the
handwheel detached. Attach the handwheel to the mixer as
shown in Figure 4.

Figure 4. Handwheel Assembly

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 15

MC-42S CONCRETE MIXER — TOWING GUIDELINES

■

Towing Safety Precautions

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

■

Check with your county or state safety
towing regulations department before

mixer

towing your

To reduce the possibility of an accident while transporting
the mixer on public roads, always make sure that the mixer
towing components and the towing vehicle are in good
operating condition and both units are mechanically sound.

The following list of suggestions should be used when towing
the mixer:

■

Make sure that the hitch and coupling of the towing vehicle
are rated equal to, or greater than the trailer "gross vehicle
weight rating" (GVWR).

■

ALWAYS inspect the hitch and coupling for wear. NEVER
tow the mixer with defective hitches, couplings, chains etc.

■

CHECK the tire air pressure on both the towing vehicle and
the trailer. Also check the tire tread wear on both vehicles.

■

ALWAYS make sure the mixer is equipped with a "Safety
Chain".

■

ALWAYS attach trailer's safety chain to the frame of towing
vehicle.

■

ALWAYS make sure that the towing vehicle's directional,
backup, and brake lights are working properly.

■

Remember in most cases the maximum speed unless
otherwise posted for highway towing is 45 MPH, however
before towing your mixer, check your local state, and county
vehicle towing requirements. Recommended off-road towing
is not to exceed 10 MPH or less depending on type of terrain.

.

Check wheel mounting lug nuts with a torque wrench.
Torque wheel lug nuts as described in the maintenance
section of this manual.

■

Check tightness of U-clamp nuts, torque suspension
hardware as referenced in the maintenance section of this
manual.

■

Avoid sudden stops and starts. This can cause skidding, or
jackknifing. Smooth, gradual starts and stops will improve
gas milage.

■

Avoid sharp turns to prevent rolling.

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

Tow Bar to Vehicle Connection (Coupler Only)

1. Check the vehicle hitch ball, and mixer's coupler for

signs of wear or damage. Replace any parts that are
worn or damaged before towing.

2. Use only a 2-inch ball diameter (towing vehicle), this

will match the mixer's 2-inch coupler. Use of any other
ball diameter will create an extremely dangerous condition
which can result in separation of the coupler and ball or
ball failure.

3. After tow bar has been connected to mixer (see next

page), attach mixer's coupler to the hitch ball on the
towing vehicle securely and make sure the lock lever
is in the down position (locked).

If the mixer tow bar is deformed or damaged
replace entire tow bar. NEVER tow the mixer
with a defective tow bar. There exist the
possibility of the trailer separating from the
towing vehicle.

■

Place

chocked blocks

while parked, if disconnected from towing vehicle.

■

Inflate tires to correct pressure, inspect tires for cuts, and
excessive wear. See Table 16 (Tire Wear Troubleshooting).

■

When towing of the mixer is required, place the drum in the
up position (mouth facing upwards).

■

ALWAYS make sure that the fuel valve lever is in the OFF
position (gasoline models only).

PAGE 16 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

underneath wheels to prevent

rolling,

Mixer Tow Bar Vehicle Connection (Pentile and Loop)

1. Make sure the bumper on the towing vehicle is equipped

2. After tow bar has been connected to mixer (see next

3. As a minimum, use a 1/2-inch bolt and nylock nut grade

to handle either a pentile or loop type tow bar
configuration.

page), secure either type of tow bar to the towing vehicle,
following state and county towing regulations.

5 when securing either tow bar to the towing vehicle,

MC-42S CONCRETE MIXER — SAFETY CHAIN CONNECTION

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

NEVER ! tow the mixer with the safety chain
removed. The safety chain is intended to

prevent complete separation of the mixer from

the towing vehicle in the event of a tow bar

failure.

Reference Figure 5 for the installation of the

Tow Bar to Mixer Connection

1. Insert the tow bar through the round opening at the
bottom of the mixer stand.

Align the hole on the tow bar with the hole on the mixer
frame, and insert 1/2-inch bolt through tow bar and frame.
Secure tow bar to frame with 1/2-inch nylock nut. Tighten
to 40 ft.-lbs.

Figure 5. Tow Bar and Safety Chain Installation

Saftey Chain

.

2. Route the safety chain through the holes just above the

3. Extend the safety chain along the length of the tow bar,

4. Connect the free end of (connector link) the safety chain

tow bar, located on each side of the mixer stand.
Loop the chain together and place under the tow bar.

Secure the loop with the connector link.

looping it through the tow bar's connector link. Remove
any excess chain slack.

to the towing vehicle.

length of the chain be properly adjusted

the

draw bar

dropping to the the ground (contact) in the event the
draw bar becomes disconnected from the towing vehicle.

Remember it is critical that the

, to prevent

and the front of the mixer stand from

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 17

MC-42S CONCRETE MIXER — ELECTRIC MOTOR

Electric Motor

For maintenance care and operation of the electric motor, refer
to your electric motor instruction booklet furnished with the electric
motor.

cirtcelE

rotoM

Protect the electric motor from dust as much as possible and
keep ventilating openings clean.

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CAUTION:

■

DO NOT spray water at any time on the

electric motor

■

DO NOT operate electric motor in a

explosive environment.

The electric motor used in this mixer is a single-phase 1/2 HP
motor. The input voltage requirement for this motor is 115 VAC.

Electric Motor Connection

.

CAUTION:

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make certain the electric motor's ON/

OFF switch is working properly. When the mixer

is not in use, place the ON/OFF switch in the
"OFF" position and disconnect the power cord
from the power source.

A 12-inch power cable (Figure 6) with a 3-prong grounding type
male plug is provided with the electrical motor for hookup to a
power source.

ALWAYS

electric motor is

, make certain that the power source required for the

correct

.

Failure

to supply the correct voltage

NOTE

to the motor can severely damage the motor. Always read the
nameplate on the electric motor to determin the proper input
voltage.

The electric motor supplied with the mixer is configured from the
factory for 115 VAC grounded operation.

ALWAYS,

make certain
that the correct size, grounded extension cord (3-wires) is used. See
Table 5.

Motors can burn out when the line voltage falls 10% below the
voltage rating of the motor. Length of the extension cord can
greatly affect the operating voltage of the motor. Reference Table
5 for recommended extension cord size with recpect to distance.
Failure to operate electric motor at correct voltage will cause
motor to overheat and actuate the overload switch.

If overload protection should actuate because of improper voltage
or any other malfunction, turn the main switch on the motor to the
"OFF" position and correct the problem, press the reset switch
button, and turn the main switch to the "ON" position.

NEVER!

disable or disconnect the
ON/OFF switch on the electric motor.
It is provided for operator safety. Injury
may result if it is disable, disconnected
or improperly maintained.

PAGE 18 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — ELECTRIC MOTOR

Figure 6. Single Phase Electric Motor with 12 inch Pigtail Cable

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 19

MC-42S CONCRETE MIXER — PRE-INSPECTION (GAS ENGINE)

Before Starting

1. Read safety instructions at the beginning of manual.

mixer

2. Clean the

, removing dirt and dust, particularly the

engine cooling air inlet, carburetor and air cleaner.

3. Check the air filter for dirt and dust. If air filter is dirty, replace
air filter with a new one as required.

4. Check carburetor for external dirt and dust. Clean with dry
compressed air.

5. Check fastening nuts and bolts for tightness.

Engine Oil Check

1. To check the engine oil level, place the mixer on
secure level ground with the engine stopped.

2. Remove the filler dipstick from the engine oil filler hole
(Figure 7) and wipe it clean.

Fuel Check

If your mixer has a gasoline engine, determine if the engine fuel
is low. If fuel is low, remove the fuel filler cap and fill with
gasoline. Motor fuels are highly flammable and can be dangerous
if mishandled. DO NOT smoke while refueling. DO NOT attempt
to refuel the trowel if the engine is

1. Remove the gasoline cap located on top of fuel tank.

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hot! or running

unleaded

.

2. Visually inspect to see if fuel level is low. If fuel is low, replenish
with unleaded fuel.

3. When refueling, be sure to use a strainer for filtration. DO

NOT top-off fuel. Wipe up any spilled fuel.

V-belt Check

A worn or damaged V-belt can adversely affect the performance
of the mixer. If a V-belt is defective or worn simply replace the V-

Figure 7. Engine Oil Dipstick (Removal)

3. Insert and remove the dipstick without screwing it into the
filler neck. Check the oil level shown on the dipstick.

belt as outlined in the maintenance section of this manual.

Blade Check

Check for worn blades. If using a steel tub and the blades are
worn, replace the entire tub assembly. Remember the blades

4. If the engine oil level is low (Figure 8), fill to the edge of
the oil filler hole with the recommended oil type (Table 6).
See Table 2 for the oil capacity of your type engine.

are welded to tub.
If using a plastic tub, replace the blades using the part numbers

referenced in the parts section of this manual.

Start/Stop Switches

This mixer has been equipped with a start/stop switches for both
the gasoline and electric motor mixers. These switches should be
tested every time the engine or motor is started.

Grease Fittings (Zerk)

Check the zerk grease fittings (Figure 27) as shown in the
maintenance section of this manual. These grease fittings lubricate
the

handwheel

and the

yoke mechanism

.

Figure 8. Engine Oil Dipstick (Oil Level)

PAGE 20 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — INITIAL START-UP (GAS ENGINE)

Starting the Engine (Gasoline Only)

4. Turn the engine switch (Figure 12) to the ON position.

The following steps outline the procedure for starting the engine.
Depending on the type of engine employed in the mixer the
steps may vary slightly. If your mixer has an electric motor
disregard this section.

1. Move the fuel shut-off lever (Figure 9) to the ON position.

5. Located at the rear of the mixer frame is the main

stop

engine.

Figure 9. Fuel Shut-OFF Lever

2. To start a cold engine, move the choke lever (Figure 10) to

the CLOSED position.

Figure 12. Engine ON/OFF Switch

start/

button (Figure 13). Pull this button outward to start the

6. Pull the
resistance, then pull briskly. The drum should be rotating at
this time.

Figure 10. Choke Lever

3. Move the throttle lever (Figure 11) away from the slow
position, about 1/3 of the way toward the fast position.

Figure 13. Engine Start/Stop Button

starter grip

Figure 14. Starter Grip

(Figure 14) lightly until you feel

Figure 11. Throttle Lever

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 21

MC-42S CONCRETE MIXER — INITIAL START-UP (ELECT. MOTOR)

Initial Start-up Instructions (Electric Motor)

Starting

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

DO NOT attempt to operate the mixer until
the Safety, General Information and
Inspection sections have been read and
understood.

1. Before starting, make sure mixer is positioned on a secure
flat surface to prevent rolling.

2. Use an extension cord (see Table 5) of adequate current
carrying capacity, insert the electric motor's power plug into
one end of the extension cord.

3.

NEVER!

NEVER!

4.

DANGERDANGER

DANGER

DANGERDANGER

use a

worn

or

frayed

extension cord.

operate mixer with V-belt cover removed.

NEVER!

with
when it is connected to a power source. The
possibly exists of electrical shock
(electrocution) even death.
water directly on the electric motor.

touch the power cord (Figure 15)

wet hands

or while

standing in water

NEVER!

spray

5. Plug the other end of the extension cord into a 120 VAC
G.F.C.I. protected receptacle. Remember the power require­ments for this electric motor is 120 VAC, 60 Hz. The use of
any other input voltage will severely damage the motor.

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

ALWAYS read the label on the electric motor
before applying power. The label will indicate

the proper power requirements for the motor.
Remember the use of any other input voltage
will severely damage the motor.

To prevent tripping (Figure 16) of both the

mixer and personnel, position the extension

cord so that it lays flat and is not curled
underneath the mixer.

Figure 15. Extension Cord (Wet Hands)

To prevent personnel from tripping over

the extension cord, position the

NOTE

extension cord so that it lays flat and is
not curled underneath the mixer.

Figure 16. Mixer (Tripping)

WARNING:WARNING:

WARNING:

WARNING:WARNING:

ALWAYS read the label on the electric motor

before applying power. The label will indicate

the correct power requirements for the motor.

Remember the use of an incorrect input

voltage will severely damage the electric

motor.

Starting the Electric Motor

1. Set the electric motor's ON/OFF switch (Figure 17) to the
ON position.

Figure 17. Electric Motor ON/OFF Switch

(ON Position)

PAGE 22 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — OPERATION

Operation

1. To position the tub, make sure the mixer is placed on firm
then

ground,

hand wheel

the
the tub is at the desired position,
to lock the tub in position.

pull up

on the

dump latch

until the tub is at the desired position. Once

pull down

(Figure 18) and turn

on the dump latch

level

3. Placing the shovel all the way inside the drum (Figure 20) will
cause the shovel to strike the blades. This condition will make
the shovel rotate, and could cause injury to personnel.
NEVER place hands inside the mixing drum while it is
rotating.

Figure 20. Filling Mixing Drum

Stopping the Mixer (Gasoline)

1. Push the main

the engine.

start/stop

switch (Figure 21) inward to stop

Figure 18. Mixing Drum Positioning

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

NEVER stand in front or behind the mixing
drum while it is being placed in the dump
position. Stay clear of the mixing drum while
it is being positioned.

2. As the drum rotates, use a shovel (Figure 19) to place the
cement mix inside the drum, add water as required. Be careful
to only place the

tip

of the shovel inside the drum.

2. Place fuel shut-off lever in the OFF position.

3. Clean drum of all debris and foreign matter.

Stopping the Mixer (Electric)

1. Place the electric motor's
the OFF position.

Figure 21. Start/Stop Button (Stop Position)

ON/OFF

Figure 22. Electric Motor ON/OFF Switch

(OFF Position)

switch (Figure 22) in

2. Disconnect the electric motor's extension cord from its
power source.

Figure 19. Filling Mixing Drum

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 23

3. Clean drum of all debris and foreign matter.

MC-42S CONCRETE MIXER — MAINTENANCE (ENGINE)

Use Table 7 as a general maintenance guideline when servicing
your engine. For more detail engine maintenance information,
refer to the engine owner's manual supplied with your engine.

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PAGE 24 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

MC-42S CONCRETE MIXER — MAINTENANCE (ENGINE)

Maintenance

Perform the scheduled maintenance procedures as defined by
Table 6 and below:

DAILY

■

Thoroughly remove dirt and oil from the engine and control
area. Clean or replace the air cleaner elements as necessary.
Check and retighten all fasteners as necessary. Check the
gearbox for oil leaks. Repair or replace as needed.

WEEKLY

■

Remove the fuel filter cap and clean the inside of the fuel
tank.

■

Remove or clean the filter at the bottom of the tank.

■

Remove and clean the spark plug (Figure 23), then adjust
the spark gap to 0.024 ~0.028 inch (0.6~0.7 mm). This unit
has electronic ignition, which requires no adjustments.

DANGER :

ENGINE AIR CLEANER

1. Remove the air cleaner cover and foam filter element as

2. Tap the paper filter element (Figure 25) several times on a

3. Clean foam element in warm, soapy water or nonflammable

DO NOT use gasoline as a cleaning solvent,
because that would create a risk of fire or
explosion.

shown in Figure 25.

hard surface to remove dirt, or blow compressed air [not
exceeding 30 psi (207 kPa, 2.1 kgf/cm
element from the air cleaner case side.
Brushing will force dirt into the fibers. Replace the paper filter
element if it is excessively dirty.

solvent. Rinse and dry thoroughly. Dip the element in clean
engine oil and completely squeeze out the excess oil from the
element before installing.

2

)] through the filter

NEVER

brush off dirt.

Figure 23. Spark Plug Gap

ENGINE OIL

warm

1. Drain the engine oil when the oil is
Figure 24.

2. Remove the oil drain bolt and sealing washer and allow
the oil to drain into a suitable container.

3. Replace engine oil with recommended type oil as listed
in Table 5. For engine oil capacity, see Table 2 (engine
specifications). DO NOT overfill.

4. Install drain bolt with sealing washer and tighten se­curely.

as shown in

Figure 25. Engine Air Cleaner

Figure 24. Engine Oil (Draining)

MC-42S CONCRETE MIXER — PARTS & OPERATION MANUAL — REV. #8 (12/16/05) — PAGE 25

MC-42S CONCRETE MIXER — MAINTENANCE (MIXER)

Ball Socket and Clamp Face Maintenance

1. If the towing vechicle is equipped with a ball socket, smear
socket periodically with multi-purpose grease.
the ball socket well lubricated.

2. Periodically oil
coupler with SAE 30 WT. motor oil.

3. When parking or storing your mixer. Keep the coupler off
the ground so dirt will not build up in the ball socket.

pivot points

and

clamp face

This will keep

surfaces of

Grease Fittings (Zerk) Maintenance (Mixer)

There are 3 grease (Figure 26) fittings that will require
lubrication. Lubricate these fittings

once a week

. Use lithium

base grease, grade N0.1.

2. Use Poleyrex EM (Exxon Mobil) or equalivant lubricant.
Clean grease fitting, apply grease gun to fitting (1/2 shot).
Remember too much grease or injecting grease too quickly
can cause premature bearing failure. Slowly apply the
recommended amount of grease, taking a miniute or so to
apply.

Wheel Bearings

1. After every 3 months of operation, remove the hub dust cap
and inspect the wheel bearings (Figure 28). 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 grease (
than 265 A.S.T.M. penetration (“No. 2.”)

never

use grease heavier

Figure 26. Grease Fittings Mixer

Grease Fittings (Zerk) Maintenance (Electric Motor)

1. There are two grease (Figure 27) fittings at each end of the
electric motor that will require lubrication. Lubricate these

fittings

about

every 16 months.

2. Fill the wheel hub (Figure 28) 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 1/6
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.

Mixer Cleaning

1. For thorough mix and longer drum life,
out after each use.

2.

Figure 27. Grease Fittings Electric Motor

PAGE 26 — MC-42S CONCRETE MIXERS — PARTS & OPERATION MANUAL — REV. #8 (12/16/05)

NEVER!

motor.

Figure 28. Wheel Hub and Bearings

to 1/4 turn or to the

always

pour or spray water over the engine or electric

wash drum