Stow MS-93 User Manual
OPERATION AND PARTS MANUAL
MODEL MS-93
PLASTER AND MORTAR MIXER
(GASOLINE ENGINE/ELECTRIC MOTOR)
Revision #5 (03/26/10)
THIS MANUAL MUST ACCOMPANY
THE EQUIPMENT AT ALL TIMES.
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 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
HERE'S HOW TO GET HELP
PLEASE HAVE THE MODEL AND SERIAL
NUMBER ON-HAND WHEN CALLING
STOW MAIN OFFICE
Post Office Box 6254 888-252-STOW
Carson, Ca 90749 FAX: 310-537-1986
Email: stow@multiquip.com
Internet: www.stowmfg.com
PARTS DEPARTMENT
800-427-1244 FAX: 800-672-7877
310-537-3700 FAX: 310-637-3284
SERVICE DEPARTMENT
800-421-1244 FAX: 310-537-4259
310-537-3700
TECHNICAL ASSISTANCE
800-478-1244 FAX: 310-631-5032
WARRANTY DEPARTMENT
800-421-1244, EXT. 279 FAX: 310-537-1173
310-537-3700, EXT. 279
SALES DEPARTMENT
310-661-4242 FAX: 310-604-9237
877-289-7869 (877-BUY-STOW)
© COPYRIGHT 2006, STOW CONSTRUCTION EQUIPMENT
STOW Construction Equipment and the STOW logo are registered trademarks of STOW and may not be used, reproduced, or
altered without written permission. All other trademarks are the property of thier 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 MS-93 Plaster/Mortar Mixer. STOW Construction Equipment 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.
To find the latest revision of this
publication, visit our website at:
www.stowmfg.com
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 3
STOW MS-93 PLASTER/MORTAR MIXER — TABLE OF CONTENTS
STOW — Plaster/Mortar Mixer
Here's How To Get Help ........................................... 3
Table Of Contents ..................................................... 4
Parts Ordering Procedures .......................................5
Specifications ...........................................................6
Dimensions ...............................................................7
Safety Messages Alert Symbols ............................8-9
Rules For Safe Operation ..................................10-11
Towing Guidelines ...................................................12
Safety Chain Connection ........................................13
Operation and Safey Decals ...................................14
General Information ................................................15
Basic Mixer Components .......................................16
Basic Engine Components ....................................17
Electric Motor ....................................................18-19
Paddle Blade Adjustment .......................................20
Inspection ..........................................................21-22
Start-up Procedures ..........................................22-24
Operation and Shut-Down ...................................... 25
Maintenance (Engine) .......................................26-27
Maintenance (Mixer) ..........................................28-32
Troubleshooting (Engine) ...................................33-34
Troubleshooting (Mixer/Electric Motor) ...................35
Electric Motor Wiring Diagram ................................ 36
Explanation of Code In Remarks Column ..............38
Suggested Spare Parts ..........................................39
HONDA GX240K1HA2 ENGINE
Air Cleaner Assembly ........................................58-59
Camshaft Assembly ...........................................60-61
Carburetor Assembly .........................................62-63
Control Assembly ..............................................64-65
Crankcase Cover Assembly ..............................66-67
Crankshaft Assembly .........................................68-69
Cylinder Barrel Assembly ..................................70-71
Cylinder Head Assembly ...................................72-73
Fan Cover Assembly ..........................................74-75
Flywheel Assembly ............................................76-77
Muffler Assembly ...............................................78-79
Fuel Tank Assembly ...........................................80-81
Ignition Coil Assembly .......................................82-83
Piston Assembly ................................................84-85
Recoil Starter Assembly ....................................86-87
Gear Reduction Assembly .................................88-89
Labels ................................................................90-91
Terms and Conditions of Sale — Parts ................... 92
Component Drawings
Nameplate and Decals ......................................40-41
Frame Assembly ................................................42-43
Paddle Shaft Assembly ......................................44-45
Steel Drum Assembly ........................................46-47
Drum and Paddle Shaft Complete Assembly ....48-49
Axle Assembly ...................................................50-51
Engine Assembly ...............................................52-53
Electric Motor Assembly ....................................54-55
Cabinet Assembly ..............................................56-57
PAGE 4 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
NOTE
Spec i fica t ions a n d are
subject to change without
.
notice
STOW MS-93 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
✓ Truck
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
Carson, CA 90746 FAX: 310-537-3927
Email: stow@stowmfg.com
Internet: www.stowmfg.com
SALES DEPARTMENT
310-661-4242 Fax: 310-604-9237
877-289-7869 (877-BUY-STOW)
PARTS DEPARTMENT
800-427-1244 FAX: 800-672-7877
310-537-3700 FAX: 310-637-3284
SERVICE DEPARTMENT
800-421-1244 FAX: 310-537-4259
310-537-3700
TECHNICAL ASSISTANCE
800-478-1244 FAX: 310-631-5032
WARRANTY DEPARTMENT
800-421-1244, EXT. 279 FAX: 310-537-1173
310-537-3700, EXT. 279
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 at no charge for freight
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
STOW CONSTRUCTION EQUIPMENT
A DIVISION OF MULTIQUIP INC.
POST OFFICE BOX 6254 CARSON, CA 90749
888-252-STOW [888-252-7869] 310-537-3700
FAX: 310-537-1986 FAX: 800-556-1986
E-MAIL: stow@multiquip.com INTERNET: www.stowmfg.com
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — 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)
STOW MS-93 PLASTER/MORTAR MIXER — SPECIFICATIONS
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NOTE
In accordance with our established
policy of constant improvement, we
reserve the right to amend these
specifications at any time without
notice.
PAGE 6 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — DIMENSIONS
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STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 7
STOW MS-93 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
NOTE
Before using this rammer, ensure that the operating individual
has read and understands all instructions in this manual.
for the safe and efficient operation of the
MQ Mikasa Model MT-84F tamping
rammer. Refer to the engine manufacturers instructions for data relative to its
safe operation.
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,
HAZARD SYMBOLS
Potential hazards associated with the operation of a MT-84F
Tamping Rammer will be referenced with Hazard Symbols
which appear throughout this manual, and will be referenced
in conjunction with Safety Message Alert Symbols.
WARNING
Lethal Exhaust Gases
Lethal Exhaust Gas Hazards
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.
WARNING
Explosive Fuel Hazards
Gasoline is extremely flammable, and
its vapors can cause an explosion if
ignited. DO NOT start the engine near
spilled fuel or combustible fluids.
DANGER
You WILL be KILLED or SERIOUSLY INJURED if
you DO NOT follow these directions.
WARNING
You CAN be KILLED or SERIOUSLY INJURED if
you DO NOT follow these directions.
CAUTION
You CAN be INJURED if you DO NOT follow
these directions.
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.
WARNING
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.
WARNING
Respiratory Hazards
ALWAYS wear approved respiratory pro-
tection when required.
PAGE 8 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 MIXER — SAFETY MESSAGE ALERT SYMBOLS
CAUTION
NEVER operate equipment with covers,
or guards removed. Keep fingers, hands,
hair and clothing away from all moving
parts to prevent injury.
CAUTION
ALWAYS disconnect the electrical power
cord from the electric motor when the
mixer is not in use and place the ON/OFF
switch in the OFF position.
CAUTION
ALWAYS wear approved eye and
hearing protection.
Rotating Parts Hazards
Accidental Starting Hazards
Eye and Hearing Hazards
CAUTION
Other important messages are provided throughout this
manual to help prevent damage to your light tower, other
property, or the surrounding environment.
Equipment Damage
Hazards
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 9
STOW MS-93 PLASTER/MORTAR 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 STOW MS-93 mortar and plaster mixer:
GENERAL SAFETY
■ DO NOT operate or service this equip-
ment 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, steel-toed boots and other
protective devices required by the job.
Read this manual!
■ NEVER touch the hot exhaust mani-
fold, 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 hot! components can cause serious
burns.
■ The engine section of this mixer requires an adequate
free flow of cooling air. 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
DEADLY carbon monoxide
gas.
■ NEVER operate this equipment when not
feeling well due to fatigue, illness or taking
medicine.
■ NEVER operate this equipment under the influence of
drugs or alcohol.
■ ALWAYS wear proper respiratory (mask),
hearing and eye protection equipment when
operating the mixer.
■ NEVER place hands inside the drum while the blades
are rotating.
■ Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.
■ Manufacture does not assume responsibility for any ac-
cident 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.
■ ALWAYS refuel in a well-
ventilated area, away from sparks and open flames.
■ ALWAYS use extreme caution when working with flam-
mable liquids. When refueling, stop the engine and allow
it to cool. DO NOT smoke around or near the machine.
Fire or explosion could result from fuel vapors, or if fuel
is spilled on a hot engine.
■ NEVER operate the mixer in an explo-
sive atmosphere or near combustible
materials. An explosion or fire could
result causing severe bodily harm or
even death.
■ Topping-off to filler port is dangerous, as it tends to spill
fuel.
■ 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.
WARNING
NEVER! start the engine or engage the paddle arms
when the drum is in the discharge (down) position.
Starting the Mixer Engine
PAGE 10 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — RULES FOR SAFE OPERATION
■ 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 carbure-
tor malfunction.
■ ALWAYS check the machine for loosened threads or bolts
before starting.
■ 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 equip-
ment. Rotating and moving parts can cause injury if
contacted.
■ When towing, an adequate safety chain must be fastened
to the frame. See Towing Guidelines section in this manual.
■ Keep all inexperienced and unauthorized people away
from the equipment at all times.
■ Unauthorized equipment modifications will void all war-
ranties.
■ 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.
Stand Clear of the
WARNING
Always stand clear of the dump handle when the mixer is
in operation. Any binding of material between the mixer
blades and the drum will cause the drum handle to quickly
move and could cause bodily harm.
Mixer when in use
TRANSPORTING
■ 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.
MAINTENANCE
■ 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 po-
tentially hazardous waste are used motor oil, fuel and
fuel filters.
■ DO NOT use food or plastic containers to dispose of
hazardous waste.
EMERGENCIES
■ ALWAYS know the location of the nearest fire extin-
guisher and first aid kit.
■ In emergencies always know the location of the
nearest phone or keep a phone on the job site.
Also know the phone numbers of the nearest
ambulance, doctor and fire department. This
information will be invaluable in the case of an
emergency.
■ 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 HONDA Engine Owner's Manual for engine
technical questions or information recommended by Multiquip for this equipment. Damage to the equipment and/
or injury to user may result.
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 11
STOW MS-93 PLASTER/MORTAR MIXER — TOWING GUIDELINES
Towing Safety Precautions
CAUTION
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:
■ Check with your county or state safety towing regulations
department before towing your 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 tow-
ing 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 55 MPH, however
before towing your mixer, check your local state, and
county vehicle towing requirements. Recommended
off-road towing is not to exceed 10 or 15 MPH or less
depending on type of terrain.
■ Place chocked blocks underneath wheels to prevent roll-
ing, while parked, if disconnected from towing vehicle.
■ Inflate tires to correct pressure, inspect tires for cuts, and
excessive wear. See Table 9 (Tire Wear Troubleshooting).
■ When towing of the mixer is required, place the drum in
the up position (mouth facing upwards) and lock the drum
latch.
Regularly Inspect
Towing Components
■ ALWAYS make sure that the fuel valve lever is in the OFF
position (gasoline models only).
■ 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.
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.
CAUTION
If the mixer tow bar is deformed or damaged, replace the
entire tow bar. NEVER tow the mixer with a defective tow
bar. There exists the possibility of the mixer separating
from the towing vehicle.
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).
Mixer Tow Bar Vehicle Connection (Pintle and Loop)
1. Make sure the bumper on the towing vehicle is
equipped to handle either a pentle or loop type tow bar
configuration.
2. After tow bar has been connected to mixer (see next
page), secure either type of tow bar to the towing vehicle,
following state and county towing regulations.
3. As a minimum, use a 1/2-inch bolt and nylock nut grade
5 when securing the tow bar to the towing vehicle and
to the unit being towed.
Replacing
Towing Components
PAGE 12 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — SAFETY CHAIN CONNECTION
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 2 for the installation of the safety chain.
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
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 draw bar and the front of the mixer stand from
dropping to the the ground (contact) in the event the
draw bar becomes disconnected from the towing vehicle.
CAUTION
DO NOT tow the mixer unless the mixing drum is com-
pletely empty. ALWAYS make sure the drum latch pin
is fully engaged to the right (Figure 3) of the drum stop
block. This will keep the drum from rotating.
Drum Saftey
when Towing
Figure 2. Tow Bar and Safety Chain Installation
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 13
Figure 3. Drum Latch Pin
(Tow or Locked Position)
MS-93 PLASTER/MORTAR MIXER — OPERATION AND SAFETY DECALS
Machine Safety Decals
The STOW MS-93 mortar and plaster mixer is equipped with a number of safety decals. These decals are provided for operator
safety and maintenance information. Figure 4 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 4. Mixer Operation and Safety Decals
PAGE 14 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — GENERAL INFORMATION
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Application
The STOW MS-93 series mixers (drum capacity of 9.0 cu.
ft./263 liters) are shipped completely assembled and have been
factory tested and are ready for use.
This mixer is only intended for the production of plaster and
mortar. The mixer must be used for its intended purpose
and is not suitable for the mixing of flammable or explosive
substances. The mixer must not be used in an explosive
atmosphere. This mixer has a batch capacity between 2-1/2
and 3-1/2 bags.
Power Plants
The STOW plaster and mortar mixer can be powered by
either a Honda GX240K1HA2 air-cooled, 4-stroke
engine
or a 2 HP electric motor. Refer to Table 2 for specific
gasoline
engine or electric motor data information.
Electrical
If mixer is equipped with an electric motor, make sure that
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.
Ensure that the extension cable is carefully laid out avoiding
wet areas, sharp edges and locations where vehicles 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
4 as general guideline when torqueing of mixer hardware
is required. Remember to keep all mixer hardware components tight.
Always make sure the OFF/ON switch on the electric motor
is in the OFF position before applying power.
It is strongly recommended when inserting the mixer's
power cord into a receptacle, that a G.F.C.I. (Ground Fault
Current Interrupter) receptacle be used (115 VAC applications).
Extension Cables
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 mm2. Choose an
extension cord of adequate current carrying capacity as
referenced in Table 6. Remember cable distance affects
the current-voltage capacity of the extension cable.
Engine Maintenance
For basic engine maintenance, refer to the engine maintenance section in this manual. For a more detailed engine
maintenance, refer to the Honda Engine Owner's manual
furnished with the engine.
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 15
STOW MS-93 PLASTER/MORTAR MIXER — BASIC MIXER COMPONENTS
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. Safety Grill Lock Handle — To prevent injury to hands
Figure 5. Mixer Components
Figure 5 illustrates the basic components and controls of
the STOW MS-93 mixer
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 engines only and is located on
the 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. Drum Bearing — There is on each end of the mixing
drum, a sealed bearing. Bearings are packed and sealed
at the factory and require no further maintenance.
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.
13. Pivot Point/Zerk Fitting — There is, on each end of the
mixing drum a zerk grease fitting. These fittings lubricate
the dumping mechanism. Lubricate both fittings at least
twice a week.
14. Dump Handle Release Pin — Pull this pin outward
(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.
15. Steel Mixing Drum — Mixing materials such as mortar,
plaster are to be placed into this drum for mixing. Always
clean the drum after each use.
16. Tow Bar/Coupler — This mixer uses a 2-inch coupler
or pintle towbar.
17. Safety Chain — This mixer uses a 3/16-inch thick,
72-inches long zinc-plated saftey chain. ALWAYS con-
nect the safety chain when towing.
18. Forklift Pockets – When lifting of the mixer is required,
use these fork lift pockets to lift the mixer. Remember to
insert the forks of the forklift a minimum of 24 inches
into the lift pockets.
19. Chock Blocks — Place these blocks (not included as
part of the mixer package) under each mixer wheel to
prevent rolling.
PAGE 16 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — BASIC ENGINE COMPONENTS
Figure 6. Engine Controls and Components
INITIAL SERVICING
The engine (Figure 6) 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.
Explosive
DANGER
Adding fuel to the tank should be done 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 SLOW, lever back toward operator
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.
Fuel Hazard
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.
Operating the engine without an air
filter, with a damaged air filter, or a
NOTE
WARNING
Engine components can generate extreme
heat. To prevent burns, DO NOT touch these
areas while the engine is running or immediately after operating. NEVER operate the
engine with the muffler removed.
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.
10. Fuel Tank – Holds unleaded gasoline. For additional
information refer to engine owner's manual.
filter in need of replacement will allow
dirt to enter the engine, causing rapid
engine wear.
Burn Hazard
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 17
STOW MS-93 PLASTER/MORTAR MIXER — ELECTRIC MOTOR
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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
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 3
HP motor. The input voltage requirement for this motor is
115/230 VAC, and has been pre-set to 230VAC.
Electric Motor Connection
A 12-inch electrical cable (Figure 7) is provided with the electrical motor for hookup to a power source. Table 5 shows the
required NEMA connector for the desired motor horsepower
rating. In addition, Table 5 also shows the matching NEMA
approved connector for the required extension cord.
Safety
Electric Motor
CAUTION
Connections
ALWAYS make certain that the power source required for
the electric motor is correct and always use the correct
NEMA configuration plug. Failure to supply the correct
voltage to the motor can severely damage the motor.
It is strongly recommended that all
NOTE
electrical wiring be done by a licensed
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
Figure 7. Single Phase Electric Motor With
12-inch Pigtail
PAGE 18 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
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STOW MS-93 PLASTER/MORTAR MIXER — ELECTRIC MOTOR
The motor supplied is wired for 115 VAC grounded operation.
Make certain that the correct size grounded (3-wires) extension
cord is used. See Table 6.
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.
Electric Motor Voltage Switch
1. ALWAYS make certain the motor switch is "OFF" and the
power cord has been disconnected from the power source.
2. Remove the voltage lock-out bolt (Figure 7). Change the
position of the voltage change toggle switch from 115
VAC to 230 VAC. The mixer is factory wired for 115 VAC
operation.
3. Replace the voltage lock-out bolt.
4. Important!, when changing the input voltage to the motor
from 115 to 230 VAC, the plug on the motor power cord
must also be changed. See Table 5.
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 19
STOW MS-93 — PADDLE BLADE ADJUSTMENT (STEEL DRUM)
Adjust paddles as shown in Figure 8.
Figure 8. Paddle Blade Adjustment, Steel Drum
PAGE 20 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — INSPECTION
Before Starting
1. Read all safety instructions at the beginning of manual.
2. Clean the mixer, 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.
Eyesight and Hearing
CAUTION
Protection
ALWAYS wear approved eye and
hearing protection before operating
the mixer.
Inspection &
CAUTION
Maintenance Saftey
NEVER place hands or feet inside the
engine guard cover while the engine is
running. ALWAYS shut the engine down
before performing any kind of maintenance service on the mixer.
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 10), fill to the edge of the oil filler
hole with the recommended oil type (Table 7). Maximum
oil capacity is 1.16 qts. (1.09 liters)
NOTE
Reference manufacturer engine
manual for specific servicing
instructions.
Figure 10. Engine Oil Dipstick (Oil Level)
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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 9) and wipe it clean.
Figure 9. Engine Oil Dipstick (Removal)
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STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 21
STOW MS-93 PLASTER/MORTAR MIXER — INSPECTION
Fuel Check
DANGER
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 unleaded gasoline. Motor
fuels are highly flammable and can be
dangerous if mishandled. DO NOT smoke
while refueling. DO NOT attempt to refuel
the mixer if the engine is hot! or running.
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.
3. When refueling, be sure to use a strainer for filtration. DO
NOT top-off fuel. Wipe up any spilled fuel.
CAUTION
NEVER! disable or disconnect the start/stop switch. It is
provided for operator safety. Injury may result if it is disable,
disconnected or improperly maintained.
Explosive Fuel
Hazard
Start/Stop Switch
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-belt as outlined in the maintenance section of
this manual.
Blade Check
Check for worn or paddle blades. Make sure that all blades
are adjusted properly. See blade adjustment procedure in
this manual. 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 electric motor is started.
Grease Fittings (Dumping Mechanism)
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 22 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — START-UP PROCEDURES
This section is intended to assist the operator
with the initial start-up of the STOW MS-93H
(gasoline engine) or STOW MS-93E (electric
motor) 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.
WARNING
General Safety
Failure to understand the operation of the STOW MS-93
series mixers could result in severe damage to the mixer
or personal injury.
See Figures 5 and 6 for the location of any control referenced in this manual.
CAUTION
Respiratory Hazard
NEVER operate the mixer in a confined
area or enclosed area structure that
does not provide ample free flow of air.
2. To start a cold engine, move the choke lever (Figure 12)
to the CLOSED position.
Figure 12. Choke Lever
3. Move the throttle lever (Figure 13) away from the slow
position, about 1/3 of the way toward the fast position.
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.
1. Move the fuel shut-off lever (Figure 11) to the ON position.
Figure 11. Fuel Shut-OFF Lever
Figure 13. Throttle Lever
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 23
MS-93 PLASTER/MORTAR MIXER —
START-UP PROCEDURES
4. Turn the engine switch (Figure 14) to the ON position.
Figure 14. Engine ON/OFF Switch
5. The main start/stop switch located on the engine cover
is (Figure 15) is used to start and stop the engine. Pull
this switch outward to start the engine.
CAUTION
Make certain the drum lock pin (Figures 17 and 18) is
placed to the RIGHT (when viewing 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 17. Drum Lock Pin (Side-View)
Preventing Drum Tipping
Figure 15. Start/Stop Switch (gasoline engine)
6. Place the belt slip lever (Figure 16) in the START/STOP
(disengaged) position.
Figure 16. Belt Slip Lever
(Start/Stop Position)
PAGE 24 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
Figure 18. Drum Lock Pin (Right Position)
7. Pull the starter grip (Figure 19) lightly until you feel
resistance, then pull briskly. Return the starter grip gently.
Figure 19. Starter Grip
STOW MS-93 PLASTER/MORTAR MIXER — OPERATION/SHUT-DOWN
8. Place the belt slip lever (Figure 20) in the mix position. This
will tilt the engine placing tension on the V-belts enabling
the shaft to rotate.
Figure 20. Belt Slip Lever (Mix Position)
Starting (electric only)
1. Using an adequate size extension cord (see Table 5),
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 7) to the
ON position.
Mixing Dumping
1. The paddle shaft inside the drum should be rotating at
this time.
2. Add a small amount water to the mixing drum.
3. Lift the mixing bag compound onto the steel safety grate
over the bag cutter and let the contents fall into the drum.
Add more water if desired and mix compound to desired
consistency.
4. When charging, mixing, or dumping a batch of plaster or
mortar the drum lock pin should be placed to the left
(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 21.
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 be maintained in
the vertical position as the paddles rotate. To discharge
the material the operator should hold the dump handle
with both hands and rotate the drum to discharge the
desired amount of material.
WARNING
Dump Handle Safety
Be sure to stand clear of the dump handle (Figure 22) when
the mixer is operational. Any binding of material between the
mixer blades and the drum will cause the drum handle to move
to the discharge position and could cause bodily harm.
Figure 22. Stand Clear of Dump Handle
STOPPING THE MIXER (gasoline engine)
1. Place the belt slip lever in the start/stop position (Figure
20).
2. Push the main start/stop switch (Figure 15) inward to
stop the engine.
3.
Turn the fuel shut-off valve to the OFF position.
4. Disconnect the spark plug.
5. Clean mixer as referenced in the maintance section of
this manual.
STOPPING THE MIXER (electric motor)
1. Place the electric motor's ON/OFF switch (Figure 4) in
the OFF position.
2. Disconnect the electric motor's extension cord from its
power source.
3. Clean mixer as referenced in the maintance section of
this manual.
Figure 21. Drum Lock Pin (Left Position)
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 25
STOW MS-93 PLASTER/MORTAR MIXER — MAINTENANCE (ENGINE)
Use Table 8 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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STOW MS-93 PLASTER/MORTAR MIXER — MAINTENANCE (ENGINE)
Maintenance
Perform the scheduled maintenance procedures as defined
by Table 8 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.
ENGINE AIR CLEANER
1. Remove the air cleaner cover and foam filter element as
shown in Figure 25.
2. Tap the paper filter element (Figure 25) several times on
a 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. NEVER brush
off dirt. Brushing will force dirt into the fibers. Replace the
paper filter element if it is excessively dirty.
3. Clean foam element in warm, soapy water or nonflammable
solvent. Rinse and dry thoroughly. Dip the element in clean
engine oil and completely squeeze out the excess oil from
the element before installing.
DANGER
DO NOT use gasoline as a cleaning sol-
vent, because that would create a risk of
fire or explosion.
Explosive
Hazard
2
)] through the filter
Figure 23. Spark Plug Gap
ENGINE OIL
1. Drain the engine oil when the oil is warm as shown in
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 7. For engine oil capacity, see Table 2 (engine
specifications). DO NOT overfill.
4. Install drain bolt with sealing washer and tighten securely.
Figure 25. Engine Air Cleaner
Figure 24. Engine Oil (Draining)
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 27
STOW MS-93 PLASTER/MORTAR 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. This will
keep the ball socket well lubricated.
2. Periodically oil pivot points and clamp face surfaces of
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.
Drum Head Seals
There is 1 set of drum head seals (Figure 26) that will require
lubrication. Lubricate the grease fitting for each drum seal
every 40 hours of operation using any grade lithium base
grease. Apply grease until visible inside of mixing drum (over
grease). This will purge seal system of contamination.
Lubricating the
CAUTION
Failure to lubricate the drum bearing grease fittings
periodically will cause the dumping mechanism to stiffen,
making the mixing drum hard to dump.
Grease Fittings
Countershaft Bearing Lubrication
There is 1 set of countershaft bearings (Figure 28) that
will require lubrication. Lubricate the grease fitting for each
countershaft bearing every 40 hours of operation using
any grade lithium base grease.
Figure 26. Grease Fittings (Drum Head Seals)
Drum Bearing Bracket Lubrication
There is 1 set of drum bearing brackets (Figure 27) that will
require lubrication. These brackets are intended to make the
drum rotate freely. Lubricate the grease fitting for each drum
bearing bracket every month or when the drum becomes
difficult to position using multi-purpose grade grease.
Figure 28. Grease Fittings (Countershaft)
Wheel Bearings
1. After every 3 months of operation, remove the hub dust
cap and inspect the wheel bearings (Figure 29). 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 (never use grease
heavier than 265 A.S.T.M. penetration (“No. 2.”)
Figure 29. Wheel Hub and Bearings
Figure 27. Grease Fittings (Dumping Mechanism)
PAGE 28 — STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10)
STOW MS-93 PLASTER/MORTAR MIXER — MAINTENANCE (MIXER)
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 to 1/4 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.
MAIN GEAR AND DRIVE PINION ALIGNMENT
1. Disconnect the spark plug wire (gasoline engines). If
mixer is equipped with an electric motor remove power
cord from AC power receptacle. In addition make sure
the clutch engagement lever is dis-engaged to relieve
V-belt tension.
2. The countershaft and drive pinion are mounted on a
slotted base. To align drive pinion with main gear, loosen
the pillow block mounting bolts and move them until the
necessary alignment has been made. Remember gears
must be paralleled aligned not skewed.
3. Using your hand, slightly move (rock) the drive pulley
back and forth to determine the amount of backlash.
Insert feeler gauge between gears to determine backlash
distance. Backlash should range between 0.007- 0.012
inches (Figure 30).
INSPECT TOOTH CONTACT BETWEEN MAIN GEAR AND
DRIVE PINION
1. Coat 3 or 4 teeth at 3 different positions on the main gear
with yellow paint.
2. Rotate the drive pulley in both directions.
3. Inspect the tooth pattern.
4. If gear teeth are not contacting properly (Figure 31), adjust
pillow block to correct the problem.
Figure 31. Gear Teeth Alignment
GEAR LUBRICATION
The surface of the pinion and main gear (Figure 32) should
be very lightly greased.
Figure 30. Drive Pinion and Main Gear (Backlash)
STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 29
Grease main and pinion gears
every 250 hours of operation.
NOTE
Figure 32. Pinion and Bull Gear Lubrication
IMPORTANT! avoid overgreasing. Excess grease will
accumulate contaminates and
cause premature wear.
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