Stow MSD0H, MS20E User Manual

PARTS AND OPERATION MANUAL

A DIVISION OF MULTIQUIP INC.

PLASTER / MORTAR MIXER

MS20H (Steel-Gasoline)

MS20E (Steel-Electric)

© COPYRIGHT 2002, MULTIQUIP INC.

A DIVISION OF MULTIQUIP INC.

Effective S/N SEC55001

Revision #3 (08/10/06)

STOW CONSTRUCTION EQUIPMENT PARTS DEPARTMENT:

A DIVISION OF MULTIQUIP INC.

POST OFFICE BOX 6254 FAX: [phone]

CARSON, CALIFORNIA 90749
310-537-3700 • 888-252-STOW [888-252-7869] 800-478-1244
FAX: [phone] • FAX: [phone] FAX: [phone]
E-MAIL: [e-mail] • WWW: stowmfg.com

800-427-1244

SERVICE DEPARTMENT/TECHNICAL ASSISTANCE:

Engine exhaust and some of
its constituents, and some dust created
by power sanding, sawing, grinding,
drillingandotherconstructionactivities
contains chemicals known to the State
of California to cause cancer, birth
defects and other reproductive harm.
Some examples of these chemicals are:

Leadfromlead-basedpaints.
Crystallinesilicafrombricks.
Cementandothermasonryproducts.
Arsenicandchromiumfrom chemically
treatedlumber.

Your risk from these exposures varies,
dependingonhowoftenyoudothistype
of work. To reduce your exposure to
these chemicals: work in aALWAYS
well ventilated area, and work with

approved safety equipment, such as

dust masks that are specially designed
to filter out microscopic particles.

PAGE 2 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

HERE'S HOW TO GET HELP

PLEASE HAVE THE MODEL AND SERIAL NUMBER
ON-HAND WHEN CALLING

PARTS DEPARTMENT

800-427-1244 or 310-537-3700
FAX: [phone] or 310-637-3284

SERVICE DEPARTMENT/TECHNICAL ASSISTANCE

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

WARRANTY DEPARTMENT

888-661-4279, or 310-661-4279
FAX: [phone]

MAIN

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

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 3

TABLE OF CONTENTS

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

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

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

Safety Messages Alert Symbols ...........................6-7

Rules For Safe Operation ................................... 8-10

Operation and Safey Decals .................................. 11

Specifications ......................................................... 12

General Information ............................................... 13

MQ-STOW — Plaster/Mortar
Mixer

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

Electric Motor .................................................... 15-16

Controls .................................................................. 17

Towing Guidelines .................................................. 18

Safety Chain Connection ....................................... 19

Trailer Safety Guidelines ...................................20-21

Paddle Blade Adjustment ....................................... 22

Pre-Inspection ...................................................23-24

Initial Start-up ....................................................25-27

Maintenance .......................................................... 28

Troubleshooting (Engine) ..................................29-30

Troubleshooting (Mixer/Motor)............................... 31

Electric Motor Wiring Diagram ............................... 32

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

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

Nameplate and Decals...................................... 36-37

Honda Engine Assembly ...................................38-39

Electric Motor Assembly.................................... 40-41

Steel Tub Assembly ...........................................42-43

Paddle Shaft Assembly .....................................44-45

Axle Assembly ...................................................46-47

Frame Assembly ...............................................48-49

Engine Cover Assembly .................................... 50-51

HONDA GX240K1HA2 ENGINE

Air Cleaner Assembly ........................................ 52-53

Camshaft Assembly .......................................... 54-55

Carburetor Assembly ........................................ 56-57

Control Assembly .............................................. 58-59

Crankcase Cover Assembly .............................. 60-61

Crankshaft Assembly ........................................ 62-63

Cylinder Barrel Assembly .................................. 64-65

Cylinder Head Assembly ................................... 66-67

Fan Cover Assembly ......................................... 68-69

Flywheel Assembly ........................................... 70-71

Muffler Assembly .............................................. 72-73

Fuel Tank Assembly .......................................... 74-75

Ignition Coil ....................................................... 76-77

Piston Assembly ................................................ 78-79

Recoil Starter .................................................... 80-81

Gear Reduction Assembly ................................ 82-83

Label Assembly ................................................. 84-85

Terms and Conditions Of Sale — Parts ................. 86

NOTE

Specification and
part number are
subject to change
without notice.

PAGE 4 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

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

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.

Here’s how to get help...

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

STOW MAIN OFFICE

18910 Wilmington Ave. 800-421-1244

FAX:

Carson, CA 90746
Email: [e-mail]
Internet: www.stowmfg.com

SALES DEPARTMENT

310-661-4242 Fax: [phone]

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

PARTS DEPARTMENT

800-427-1244
310-537-3700

SERVICE DEPARTMENT

800-478-1244
310-537-3700

TECHNICAL ASSISTANCE

800-478-1244

WARRANTY DEPARTMENT

800-421-1244,
310-537-3700,

EXT.
EXT.

279
279

310-537-3927

FAX:

800-672-7877

FAX:

310-637-3284

FAX:

310-537-4259

FAX:

310-631-5032

FAX:

310-537-1173

Place Your Parts Order Via Web or Fax

For Even More Savings!

(Domestic USA Dealers Only)

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.

**Common nuts, bolts and washers (all items under $1.00
list price) do not count towards the 10+ line items.

NOTE: DISCOUNTS ARE SUBJECT TO CHANGE

at no charge for freight

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

A DIVISION OF MULTIQUIP INC.

POST OFFICE BOX 6254 CARSON, CA 90749
888-252-STOW [888-252-7869] 310-537-3700

FAX: [phone] FAX: [phone]
E-MAIL: [e-mail] INTERNET: www.stowmfg.com

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 5

Direct TOLL-FREE access

to our Parts Department:

Toll-free nationwide — 800-427-1244

Toll-free FAX — 800-6-PARTS-7

(800/672-7877)

MS-20 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.

HAZARD SYMBOLS

NOTE

This Owner's Manual has been developed to provide
complete instructions for the safe and efficient operations
of the MQ STOW
engine manufacturers instructions for data relative to its
safe operation.

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

mortar

and

plaster

mixer. Refer to the

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,

Lethal Exhaust Gases

Engine exhaust gases contain poisonous

carbon monoxide. This gas is colorless and
odorless, and can cause death if inhaled.

NEVER operate this equipment in a confined
area or enclosed structure that does not

provide ample free flow air.

Explosive Fuel

Gasoline is extremely flammable, and its
vapors can cause an explosion if ignited. DO
NOT start the engine near spilled fuel or
combustible fluids. DO NOT fill the fuel tank
while the engine is running or hot. DO NOT
overfill tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or
sparks from the ignition system. Store fuel in

approved containers, in well-ventilated areas
and away from sparks and flames. NEVER
use fuel as a cleaning agent.

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

Potential hazards associated with operation of the mixer will be
referenced with Hazard Symbols which appear throughout this
manual, and will be referenced in conjunction with Safety
Message Alert Symbols.

Burn Hazards

Engine components can generate extreme heat.
To prevent burns, DO NOT touch these areas
while the engine is running or immediately after
operations. NEVER operate the engine with
heat shields or heat guards removed.

PAGE 6 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS-20 MIXER — SAFETY MESSAGE ALERT SYMBOLS

Accidental Starting

ALWAYS place the ON/OFF switch in the OFF

position, disconnect the spark plug lead before
servicing the engine or equipment. Ground
the lead to prevent sparks that could ignite a
fire.

Sight and Hearing hazard

ALWAYS wear approved

protection.

eye

and

hearing

Respiratory Hazard

ALWAYS wear approved respiratory

protection.

Equipment Damage Messages

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

NOTE

This

MIXER

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

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 7

MS20H/MS20E MIXER — RULES FOR SAFE OPERATION

■

CAUTION:

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 MS20H/MS20E mortar and plaster mixers:

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.

■

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

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

■

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

■

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.

■

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
with

■

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

hot!

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.
Remember the mixer's
engine gives off
carbon monoxide gas.

DEADLY

■

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.

PAGE 8 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

■

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

smoke

cool. DO NOT
machine. Fire or explosion 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

bodily harm or even death.

around or near the

MS20H/MS20E MIXER — RULES FOR SAFE OPERATION

■

Stop the engine when leaving the mixer unattended.

■

Block the unit when leaving or when using on a slope.

■

Maintain this equipment in a safe operating condition at all
times.

■

ALWAYS stop the engine before servicing, adding fuel and

oil.

■

NEVER Run engine without air filter. Severe engine may

occur.

■

ALWAYS service air cleaner frequently to prevent carburetor
malfunction.

■

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

■

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.

■

DO NOT operate this equipment unless all guards and safety

devices are attached and in place.

■

CAUTION must be exercised while servicing this equipment.
Rotating and moving parts can cause injury if contacted.

Transporting

■

■

■

Maintenance Safety

■

■

■

■

■

■

ALWAYS shutdown engine before transporting.

Tighten fuel tank cap securely and close fuel cock to prevent
fuel from spilling.

Drain fuel when transporting mixer over long distances or
bad roads.

NEVER lubricate components or attempt service on a running
mixer.

ALWAYS allow the mixer a proper amount of time to cool

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

broken parts.
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.

■

When towing, an adequate safety chain must be fastened to
the frame, refer to page 19.

■

Keep all

inexperienced

and

unauthorized

people away

from the equipment at all times.

■

Unauthorized equipment modifications will void all warranties.

■

Check all fasteners periodically for tightness. Also check
towing tongue bolt, lock nut and wheel lug nuts for wear.

■

Stop the engine and disconnect the spark plug before allowing
anybody’s hands in the mixing drum.

■

NEVER pour or spray water over the engine or electric motor.

■

ALWAYS stand clear of dump handle when mixer is in

operation. Any binding of material between the mixer blades
and drum will cause drum and handle to quickly move in the
discharge position.

■

Depending on type of mixer, test the

ON/OFF

switch for either
the gasoline engine or electric motor before operating. The
purpose of these switches is to shut down the engine or motor
of the mixer.

■

Refer to the
technical questions or information

HONDA Engine Owner's Manual

for engine

recommended by Multiquip
for this equipment. Damage to the equipment and/or injury to
user may result.

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 9

MS20H/MS20E MIXER — RULES FOR SAFE OPERATION

Emergencies

■

ALWAYS know the location of the nearest

■

ALWAYS know the location of the nearest and

fire extinguisher

first aid kit

.

.

■

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

PAGE 10 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS20H/MS20E MIXER — OPERATION AND SAFETY DECALS

Machine Safety Decals

The MQ STOW mortar and plaster mixer is equipped with a number of safety decals. These decals are provided for operator safety
and maintenance information. Figure 1 below illustrates these decals as they appear on the machine. Should any of these decals
become unreadable, replacements can be obtained from your dealer.

Figure 1. Mixer Operation and Safety Decals

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 11

MS20H/MS20E MIXER — SPECIFICATIONS

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PAGE 12 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

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MS20H/MS20E MIXER — GENERAL INFORMATION

GENERAL

The MQ STOW Model MS20H (Honda GX240K1) gasoline
engine) and MS20E (electric motor) plaster and mortar mixers
are shipped completely assembled and have been factory tested.

The drum batch capacity of these mixers is between 3.5 and

4.0 bags. With proper care, they will give continuous service
year-after-year.

These mixers can be powered by either gasoline or electric
motors. The shaft of the engine or electric motor is connected to
a drive belt pulley which is attached to a main gear. As the main
gear rotates it causes the paddle shaft to rotate.

BEFORE STARTING

Before starting the engine, read the engine owners manual and
thoroughly understand the safety information.

Check the items listed below:

OIL LEVELS

Be sure to check the oil levels in the engine and engine reduction
unit before starting the unit (gasoline model only).

HARDWARE

GASOLINE ENGINE CARE

For care and operation of the gasoline engine, refer to the engine
manufacturer’s operating instructions furnished with the engine.
We recommend draining and refilling the engine crankcase at
least every thirty hours of operation. Check the engine oil level
daily.

GASOLINE MIXER OFF/ON SWITCH

This feature is on gasoline engine mixers only. Located on the
side of the engine cover. The purpose of this switch is to start
and stop the mixer in normal operation.

ELECTRIC MOTOR MIXER OFF/ON SWITCH

This feature is on electric motor mixers only. This switch is located
on top of the motor. Lift the engine cover to gain access to this
switch. The purpose of this switch is to start and stop the mixer in
normal operation. NEVER use the electric motor in an explosive
environment.

ENGINE THROTTLE AND CHOKE CONTROLS

Please refer to the engine owners manual for specific instructions.

Check all hardware on the mixer before starting. Periodically
inspect all hardware. Loose hardware can contribute to early
component failure and poor performance. Use the torque chart
below as a general guideline and keep all hardware tight:

HARDWARE DIA TORQUE (LB./FT.)

5/16"- 18 24
3/8" - 24 37
1/2" - 13 39
1/2" - 13 (Grade 8) 90

NOTE

In accordance with our established
policy of constant improvement, we
reserve the right to amend these
specifications at any time without
notice.

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 13

MS20H/MS20E MIXER — BASIC ENGINE COMPONENTS

Figure 2. Engine Controls and Components

INITIAL SERVICING

The engine (Figure 2) 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 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS20H/MS20E MIXER — ELECTRIC MOTOR

Electric Motor

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

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

Electric Motor Voltage Switch

ALWAYS

1.
power cord has been disconnected from the power source.

2. Remove the voltage lock-out bolt
position of the
VAC to 230 VAC. The mixer is factory wired for 115 VAC

CAUTION:

■

electric motor

■

explosive environment.

DO NOT spray water at any time on the

.

DO NOT operate electric motor in a

operation.

3. Replace the voltage lock-out bolt.

4.

Important!,

from 115 to 230 VAC the
must also be changed. See Table 3.

The electric motor used in this mixer is a single-phase 1.5 HP
motor. The input voltage requirement for this motor is either 115
or 230 VAC only.

Electric Motor Connection

A 12 inch electrical cable (Figure 2) with a pigtail at one end is
provided with the electrical motor for hookup to a power source.
Table 1. shows the required NEMA connector for the desired
motor horsepower rating. In addition, Table 2 also shows the
matching NEMA approved connector for the required extension
cord.

ALWAYS

electric motor is
configuration plug.

, make certain that the power source required for the

correct

and always use the correct NEMA

Failure

to supply the correct voltage to the

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motor can severely damage the motor.
The motor supplied is wired for 115 VAC grounded operation.

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cord is used. See Table 4.

make certain the motor switch is "OFF" and the

(Figure 3). Change the

voltage change toggle switch

when changing the input voltage to the motor

plug

on the motor power cord

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Motors can burn out when the line voltage falls 10% below the
voltage rating of the motor. Failure to use proper voltage will
cause the 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.

It is strongly recommended that all

licensed

NOTE

electrical wiring be done by a

electrician

. Special attention should be

given to the electric switch as well as
the over-and-under voltage protection devices as per regulations
set forth in the local electrical safety code handbook.

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 15

MS20H/MS20E MIXER — ELECTRIC MOTOR

Figure 3. Single Phase Electric Motor with 18 inch Pigtail Cable

PAGE 16 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS20H/MS20E MIXER — CONTROLS

8. Mixing Paddles — Used in the mixing of material. This
unit uses four different types of paddles to provide a fast
uniform mix.

9. Bag Cutter— This feature allows compound mixing bags
to be opened easily, therefore allowing the contents of the
bag to fall directly into the mixing drum.

10. Safety Grill — Provided for operator safety. This safety
grill is designed to keep hands and solid objects out of the
mixing drum when in use. This grill should be closed at all
times when mixer is in use. DO NOT remove the grill or
grill opening bar. Keep the grill clean by washing it down
daily.

11. Dump Handle — Pull this handle downward to dump the
contents of the drum. Push the handle upward to return
the drum to its vertical position.

12. Pivot Point/Zerk Fitting — There is, on each end of the

Figure 4. Mixer Components

Figure 4 illustrates the basic components and controls of
the MS20H/MS20E mixer

mixing drum a zerk grease fitting. These fittings lubricate
the dumping mechanism. Lubricate both fittings at least
twice a week.

1. Tires Ply — The tire ply (layers) number is rated in letters;
This mixer uses 13-inch 4-ply tires.

2. Engine Cover — Lift this cover to gain access to the engine
compartment.

3. Belt Slip Lever — When starting this lever should be
move upward and to the left. For mixing place the lever in
the down position. See attached decal located adjacent to
lever.

4. ON/OFF Switch (electric) — This switch is provided on
mixers with electric motors. To gain access to this switch,
lift the engine cover. When activated it will shut down the
electric motor.

5. ON/OFF Switch (gasoline) — This switch is provided on

mixers with gasoline

side of the engine cover. When activated it will shut down
the engine.

6. Latch — Use this latch to secure the engine compartment
cabinet.

7. Safety Grill Lock Handle — To prevent injury to hands
and arms, the safety grill should ALWAYS be locked when
the mixing of plaster or mortar is required. Also when
transporting the mixer the safety grill should be locked.
The safety grill should only be un-locked when cleaning
of the blades and drum is required.

engines only and is located on the

13. Dump Handle Release Pin — Pull this pin outward

14. Tow Bar/Coupler — This mixer uses a 2-inch coupler or

15. Safety Chain — This mixer uses a 3/16-inch thick, 72-

16. Steel Mixing Drum — Mixing materials such as mortar,

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

(spring loaded) to release the drum, then pull down on the
dump handle to place the drum in the dump position. When
drum is in dump position, pin will automatically lock drum.

pintle

inches long zinc-plated saftey chain.
the safety chain when towing.

plaster are to be placed into this drum for mixing. Always
clean the drum after each use.

part of the mixer package) under each mixer wheel to
prevent rolling.

ALWAYS

connect

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 17

MS20H/MS20E MIXER — TOWING GUIDELINES

■

Towing Safety Precautions

CAUTION :

■

Check with your county or state safety
towing regulations department before
towing your

To reduce the possibility of an accident while transporting
the mixer on public roads, always make sure that the trailer
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 trailer section of the mixer is
equipped with a "Safety Chain".

■

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

mortar and plaster mixer

.

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.

■

DO NOT transport mixer with fuel in the fuel tank.

CAUTION :

Mixer Trailer Vehicle Connection

1. Check the vehicle hitch ball, and trailer coupler for signs
of wear or damage. Replace any parts that are worn or
damaged before towing.

2. Use only the 2-inch ball diameter with a towing capability
of 5,000 lbs. (2,268 kg) as indicated on the trailer's
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. Be sure the coupler is secured to the hitch ball and the
lock lever is down (locked).

4. Attach safety chains as shown in Figure 5. Remember
to
the mixer.

If the trailer coupler is deformed replace
entire coupler. NEVER tow the pump with
a defective trailer coupler. There exist the

possibility of the trailer separating from
the towing vehicle.

cross

the safety chains underneath the towpole of

■

Remember in most cases the maximum speed unless
otherwise posted for highway towing is 55 MPH, however
before towing your mixer, check your local state, and
county vehicle towing requirements. Recommended off­road towing is not to exceed 10 MPH or less depending
on type of terrain.

■

Place

chocked blocks

rolling,

■

Inflate tires to correct pressure, inspect tires for cuts,
and excessive wear. See Table 4 (Tire Wear
Troubleshooting).

■

Check wheel mounting lug nuts with a torque wrench.
Torque wheel lug nuts as described in the "

while parked.

Torque Requirements

■

Check tightness of suspension hardware (nuts and bolts).

PAGE 18 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

underneath wheel to prevent

Lug Nut

", Table 6.

5. After towing for about 50 miles recheck the entire towing

Recommended Maintenance

1. Smear ball socket and clamp face with chassis grease.

2. When parking or storing the mixer, keep the coupler off

system for tightness.

Periodically oil pivot points and were surfaces of coupler
with SAE 30 W motor oil.

the ground so dirt and other debris will not build up in
the ball socket.

MS20H/MS20E MIXER — SAFETY CHAIN CONNECTION

CAUTIONCAUTION

CAUTION

CAUTIONCAUTION

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.

Always Tow with

a Safety Chain

safety chain

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

3. extend the safety chain along the length of the tow bar,
looping it through the tow bar's connector link. Remove
any excess chain slack.

.

4. Connect the free end of (clevis safety hook) the safety
chain to the towing vehicle. Remember it is critical that
the length of the chain be properly adjusted, to prevent
the
dropping to the the ground (contact) in the event the
draw bar becomes disconnected from the towing vehicle.

DO NOT tow the mixer unless the mixing drum is

completely empty. ALWAYS

pin is fully engaged to the
stop block. This will keep the drum from rotating.

draw bar

CAUTIONCAUTION

CAUTION

CAUTIONCAUTION

and the front of the mixer stand from

Drum Saftey

when Towing

make sure the drum latch

right

(Figure 6) of the drum

Figure 5. Mixer Safety Chain and Coupler

Figure 6. Drum Latch Pin

(Tow or Locked Position)

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 19

MS20H/MS20E MIXER — TRAILER SAFETY GUIDELINES

Tires/Wheels/Lug Nuts

Tires and wheels are a very important and critical compo­nents of the trailer. When specifying or replacing the trailer
wheels it is important the wheels, tires, and axle are prop­erly matched.

CAUTION :

DO NOT attempt to repair or modify a

wheel. DO NOT install an inter-tube to
correct a leak through the rim. If the rim

is cracked, the
air pressure in the inter-tube may
cause pieces of the rim to
explode (break-off) with great
force and can cause serious eye
or bodily injury.

Tires Wear/Inflation

Tire inflation pressure is the most important factor in tire
life. Pressure should be checked cold before operation.
DO NOT bleed air from tires when they are hot. Check
inflation pressure weekly during use to insure the maxi­mum tire life and tread wear.

Suspension

The rigid type axle and associated hardware (Figure 7) should
be periodically inspected for signs of excessive wear, elon­gation of bolt holes, and loosening of fasteners. Replace
all damaged parts immediately.

Table 5 (Tire Wear Troubleshooting) will help pinpoint the
causes and solutions of tire wear problems.

NOTE

ALWAYS

removing or installing force fitted
parts. Failure to comply may result

in serious injury.

wear safety glasses when

Figure 7. Axle Support Components

PAGE 20 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS20H/MS20E MIXER — TRAILER SAFETY GUIDELINES

Lug Nut Torque Requirements

It is extremely important to apply and maintain proper wheel
mounting torque on the trailer. Be sure to use only the
fasteners matched to the cone angle of the wheel. Proper
procedure for attachment of the wheels is as follows:

1. Start all wheel lug nuts by hand.

2. Torque all lug nuts in sequence. See Figure 8. DO NOT
torque the wheel lug nuts all the way down. Tighten each lug
nut in 3 separate passes as defined by Table 6.

stnemeriuqeReuqroTeriT.6elbaT

eziSleehWssaPtsriF

SBL-TF

"2152-0204-5356-05

"3152-0204-5356-05

"4152-0206-05021-09

5152-0206-05021-09

"

"6152-0206-05021-09

3. After first road use, retorque all lug nuts in sequence. Check
all wheel lug nuts periodically.

NOTE

ssaPdnoceS

SBL-TF

ssaPdrihT

SBL-TF

NEVER!

use an
pneumatic air gun
to tighten wheel
lug nuts.

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 21

Figure 8. Wheel Lug Nuts Tightening Sequence

MS20H/MS20E MIXER — PADDLE BLADE ADJUSTMENT

Adjust paddles as shown in Figure 9.

Figure 9. Paddle Blade Adjustment, Steel Drum

PAGE 22 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

CAUTIONCAUTION

CAUTION

CAUTIONCAUTION

NEVER operate the mixer
in a confined area or
enclosed area structure
that does not provide ample

free flow of air

ALWAYS wear approved eye and hearing

protection before operating the mixer.

NEVER place hands or feet inside the guard
cover while the engine is running. ALWAYS
shut the engine down before performing any
kind of maintenance service on the trowel.

.

MS20H/MS20E MIXER — PRE-INSPECTION

Figure 10. 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.

4. If the oil level is low (Figure 11), fill to the edge of the oil filler
hole with the recommended oil type (Table 7). Maximum oil
capacity is 400 cc.

It is recommended that the mixer's
the engine after every use. Doing this will verify that the switch is
working properly and presents no danger to the operator.

Before Starting

1. Read safety instructions at the beginning of manual.

mixer

2. Clean 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 trowel on secure level
ground with the engine stopped.

, removing dirt and dust, particularly the

kill switch

be used to stop

NOTE

Reference manufacturer engine
manual for specific servicing
instructions.

Figure 11. Engine Oil Dipstick (Oil Level)

epyTliO.7elbaT

nosaeS erutarepmeT epyTliO

remmuS rehgiHroC°52 03-W01EAS

2. Remove the filler dipstick from the engine oil filler hole
(Figure 10) and wipe it clean.

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 23

llaF/gnirpS C°01~C°52 02/03-W01EAS

retniW rewoLroC°0 01-W01EAS

MS20H/MS20E MIXER — PRE-INSPECTION

Explosive 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 V­belt as outlined in the maintenance section of this manual.

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.

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

NEVER!

hot! or running

disable or disconnect the

unleaded

.

start/stop switch. It is provided for

NOTE

operator safety. Injury may result if it is
disable, disconnected or improperly

Blade Check

Check for worn or paddle blades. Make sure that all blades are
adjusted properly. See blade adjustment procedure on page 22.
Replace all defective or damaged blades immediately.

Controls
Start/Stop Switches

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

Lubricants
Engine Oil

1. Remove the engine oil dipstick from its holder.

2. Determine if the engine oil is low, add correct amount of
engine oil to bring oil level to a normal safe level.

maintained.

Grease Fittings (Zerk)

1. Check the zerk grease fittings at each end of the mixing
drum. These grease fittings lubricate the dumping
mechanism. If the dumping handle is stiff or hard to move
lubricate these fittings.

PAGE 24 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

MS20H/MS20E MIXER — INITIAL START-UP

This section is intended to assist the operator with
the initial start-up of the MS-20H (gasoline) or
MS20E (electric) mixer. It is extremely important that
this section be read carefully before attempting to
use the mixer in the field.

DO NOT use your mixer until this section is thoroughly
understood.

2. To start a cold engine, move the choke lever (Figure 13) to
the CLOSED position.

CAUTION:

Failure to understand the operation of the
MS20H/MS20E mixers could result in severe

damage to the mixer or personal injury.

See Figure 4 (Page 17) for the location of any control referenced
in this manual.

3. Move the throttle lever (Figure 14) away from the slow

Starting (gasoline only)

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.

position, about 1/3 of the way toward the fast position.

Figure 13. Choke Lever

1. Move the fuel shut-off lever (Figure 12) to the ON position.

Figure 12. Fuel Shut-OFF Lever

Figure 14. Throttle Lever

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 25

MS20H/MS20E MIXER — INITIAL START-UP

4. Turn the engine switch (Figure 15) to the ON position.

Figure 15. Engine ON/OFF Switch

5. Located on the engine cover is the main
(Figure 16). Pull this switch outward to start the engine.

start/stop

switch

CAUTION:

Make certain the

and 19) is placed to the
the mixer from the towpole end) of the drum

stop block which is welded to the front side of
the drum. Also make sure lock pin is fully
engaged (locked). This will prevent the drum

from tipping.

Figure 19. Drum Lock Pin (Side-View)

drum lock pin

right

(Figures 18

(when viewing

Figure 16. Start/Stop Switch (gasoline)

6. Place the belt slip lever (Figure 17) in the
position.

Figure 18. Belt Slip Lever

(Start/Stop Position)

PAGE 26 — MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06)

START/STOP

Figure 19. Drum Lock Pin (Right Position)

7. Pull the
resistance, then pull briskly. Return the starter grip gently.

starter grip

Figure 20. Starter Grip

(Figure 20) lightly until you feel

MS20H/MS20E MIXER — INITIAL START-UP

8. Place the belt slip lever (Figure 21) in the
This will tilt the engine placing tension on the V-belts
enabling the shaft to rotate.

Figure 21. Belt Slip Lever

(Mix Position)

Starting (electric only)

1. Using an adequate size extension cord (see Table 4),
connect one end of the extension cord to the plug on the
electric motor, connect the other end to the power source.
Make sure the motor is configured for the proper operating
voltage.

2. Set the electric motor's ON/OFF switch (Figure 3) to the

ON position.

Mixing Dumping

1. The paddle shaft inside the drum should be rotating at this
time.

2. Lift the mixing bag compound onto the steel grate over the
bag cutter and let the contents fall into the drum.

3. Add water, and mix compound to desired consistency.

4. When charging, mixing, or dumping a batch of plaster or
mortar the
(when viewing the mixer from the towpole end) of the drum
stop block which is welded to the front side of the drum.
See Figure 22.

This will allow the operator to use both hands on the drum
handle during dumping. Please note that when the lock pin
is placed to the left, the drum will only rotate in a clockwise
direction. When the dump handle is released, the drum will
return to an upright position.

drum lock pin

should be placed to the

mix

position.

NOTE

blades and the drum will cause the drum handle to move to the
discharge position, thus causing bodily harm.

Starting (electric only)

1. Using an adequate size extension cord (see Table 4),
connect one end of the extension cord to the plug on the
electric motor, connect the other end to the power source.
Make sure the motor is configured for the proper operating
source.

2. Set the electric motor's ON/OFF switch (Figure 3) to the

ON position.

STOPPING THE MIXER (gasoline)

1. Place the

2. Push the main
the engine.

Tu r n the fuel shut-off valve to the OFF position.

3.

left

4. Disconnect the spark plug.

5. Clean drum of all debris and foreign matter.

STOPPING THE MIXER (electric)

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

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

3. Clean drum of all debris and foreign matter

Figure 22. Drum Lock Pin (Left Position)

Be sure to stand clear of the

dump handle

operational. Any binding of
material between the mixer

belt slip lever

start/stop

in the

switch (Figure 8) inward to stop

start/stop

start/stop

when the mixer is

position.

switch (Figure 3) in

MQ STOW MS20H/MS20E MIXER — PARTS & OPERATION MANUAL — REV. #3 (08/10/06) — PAGE 27