MBW F36/4 User manual

OPERATOR’SSAFETY
AND SERVICE MANUAL
MBW, Inc.
250 Hartford Rd • PO Box 440
Slinger, WI 53086-0440
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.mbw.com
MBW (UK) Ltd.
Units 2 & 3
Cochrane Street
Bolton BL3 6BN, England
Phone: [phone]
Fax: [phone]
MBW France S.A.R.L
Z.A. d’Outreville
11 rue Jean Baptiste Néron,
60540 BORNEL
France
Phone: [phone]
Fax: [phone]
L19968.05.11.A
©MBW, Inc. 2007
Printed in the USA
F36/4
F46/4
This manual covers the following serial numbers and higher,
for each model listed:
F36/4 . . . . . . . . . . . . . . . . . . . . . 3630001.
FF6/4. . . . . . . . . . . . . . . . . . . . . 4630001.
WALK-BEHIND TROWELS

TABLE OFCONTENTS
Safety Information . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Decals - Constant Force Pitch Handle . . . . . . 3
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Starting & Operating . . . . . . . . . . . . . . . . . . . . 5
Starting Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Blade Pitch Adjustment (Standard). . . . . . . . . . . . . . . 5
Blade Pitch Adjustment (Constant Force). . . . . . . . . . 5
Handle Bar Adjustment. . . . . . . . . . . . . . . . . . . . . . . . 5
Stopping Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . 7
Fluid Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Engine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Engine Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Changing Trowel Blades . . . . . . . . . . . . . . . . . . . . . . 8
Setting Tilt Arm Carriage Bolt Height . . . . . . . . . . . . . 8
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Torque Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Service Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Gearbox Disassembly . . . . . . . . . . . . . . . . . . . . . . . . 9
Gearbox Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CFP Handle Cable/Spring Replacement . . . . . . . . . 10
Standard Handle Pitch Cable Replacement. . . . . . . 11
Spider Bushing Replacement. . . . . . . . . . . . . . . . . . 12
Parts Replacement Cycles and Tolerances . . . . . . . 12
Replacement Parts . . . . . . . . . . . . . . . . . . . . . 13
Gearbox Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Spider Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Guard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Handle Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Constant Force Handle Assembly . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

CALIFORNIA PROPOSITION 65 WARNING
Engine exhaust and some of its constituents are
known in the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING

- 1 -
SAFETY INFORMATION
Introduction
This Safety Alert Symbol is used to call attention
to items or operations which may be dangerous
to those operating or working with this
equipment. The symbol can be found
throughout this manual and on the unit. Please read these
warnings and cautions, along with all decals, carefully
before attempting to operate the unit. Make sure every
individual who operates or works with this equipment is
familiar with all safety precautions.
WARNING
GENERAL WARNING. Indicates information
important to the proper operation of the
equipment. Failure to observe may result in
damage to the equipment and/or severe bodily
injury or death.
CAUTION
GENERAL CAUTION. Indicates information
important to the proper operation of the
equipment. Failure to observe may result in
damage to the equipment.
Safety Precautions
LETHAL EXHAUST GAS: An internal
combustion engine discharges carbon
monoxide, a poisonous, odorless, invisible
gas. Death or serious illness may result if
inhaled. Operate only in an area with proper
ventilation. NEVER OPERATE IN A
CONFINED AREA!
DANGEROUS FUELS: Use extreme caution
when storing, handling and using fuels, as
they are highly volatile and explosive in vapor
state. Do not add fuel while engine is running.
Stop and cool the engine before adding fuel.
DO NOT SMOKE!
SAFETY GUARDS: It is the owner's
responsibility to ensure that all guards and
shields are in place and in working order.
IGNITION SYSTEMS: Breakerless, magneto,
and battery ignition systems can cause severe
electrical shocks. Avoid contacting these
units or their wiring.
SAFE DRESS: Do not wear loose clothing,
rings, wristwatches, etc. near machinery.
NOISE PROTECTION: Wear OSHA specified
hearing protection devices.
EYE PROTECTION: Wear OSHA specified
eye shields, safety glasses, and sweat bands.
FOOT PROTECTION: Wear OSHA specified
steel-tipped safety shoes.
HEAD PROTECTION: Wear OSHA specified
safety helmets.
DUST PROTECTION: Wear OSHA specified
dust mask or respirator.
OPERATOR: Keep children and bystanders
off and away from the equipment.
REFERENCES: For details on safety rules and regulations
in the United States, contact your local Occupational Safety
and Health Administration (OSHA) office. Equipment
operated in other countries must be operated and serviced
in accordance and compliance with any and all safety
requirements of that country. The publication of these
safety precautions is done for your information. MBW does
not by the publication of these precautions, imply or in any
way represent that these are the sum of all dangers present
near MBW equipment. If you are operating MBW
equipment, it is your responsibility to insure that such
operation is in full accordance with all applicable safety
requirements and codes. All requirements of the United
States Federal Occupational Safety and Health
Administration Act must be met when operated in areas that
are under the jurisdiction of that United States Department.
Safety Decals
Carefully read and follow all safety decals. Keep them in
good condition. If decals become damaged, replace as
required. If repainting the unit, replace all decals. Decals
are available from authorized MBW distributors. Order the
decal set listed on the following page(s).

- 2 -
13483
CAUTION
Wear approved hearing protection,
foot protection, eye protection and
head protection.
STOP
Read the Operating Instructions
before operating this piece of
equipment.
Keep unauthorized and untrained
people away from this
equipment.
ROTATING & MOVING PARTS!
Make sure all guards and safety
devices are in place.
Failure to comply could result in serious
bodily injury.
SHUT OFF the motor before servic-
ing or cleaning.
DO NOT RUN in an enclosed area.
The engine produces carbon
monoxide, a POISONOUS GAS.
Safety Decals (Decal Kit #19975)
12265
01260
19961
01449
05950
19970
19961
13483
19971
12267






M-B-W INC.
P.O. Box 440, Slinger, WI 53086
USA * ENGLAND
01260 OFF
ON
S
A
F
E
T
Y
S
W
I
T
C
H
19961
MBW POWER TROWEL
WARNING
When lifting attach
proper safety chains to
hook.
Approximate weight
F46 Models:
300 lbs. (136 kg)
F36 Models:
200 lbs. (91 kg)
01449


OPERATING INSTRUCTIONS
1. Check engine oil and trowel gearbox oil.
2. Open fuel valve, put engine switch on.
3. Put SAFETY SWITCH in ON position; set
throttle to idle position.
4. Choke engine. A warm engine may not need to
be choked.
5. Starting engine: Place one hand on trowel
handle and other hand on engine starter rope.
NEVER place foot on guard ring. Pull starter
rope.
6. Open choke, allow engine to warm up at idle.
7. Position throttle for various operating
conditions.
8. TO STOP: Return throttle to idle position, put
safety switch to off position. Close fuel valve.
19970
19961
MBW POWER TROWEL
ROTATING PARTS
can crush and cut. Keep
hands awa
y
!
19971
WARNING



!"
#!$
19791
WARNING
OPERATION OF THIS EQUIPMENT MAY
CREATE SPARKS THAT CAN START FIRES
AROUND DRY VEGETATION. A SPARK
ARRESTER MAY BE REQUIRED. THE
OPERATOR SHOULD CONTACT LOCAL FIRE
AGENCIES FOR LAWS OR REGULATIONS
RELATING TO FIRE PREVENTION
19791
19962
F36/4
19962 - 36”
19963 - 46”

- 3 -
16168
CONSTANT FORCE
PITCH
16167
WARNING
Spring under tension!
Consult manual before
attempting service.
19791
WARNING
OPERATION OF THIS EQUIPMENT MAY
CREATE SPARKS THAT CAN START FIRES
AROUND DRY VEGETATION. A SPARK
ARRESTER MAY BE REQUIRED. THE
OPERATOR SHOULD CONTACT LOCAL FIRE
AGENCIES FOR LAWS OR REGULATIONS
RELATING TO FIRE PREVENTION
Safety Decals - Constant Force Pitch Handle
16168
CONSTANT FORCE
PITCH
16167
WARNING
Spring under tension!
Consult manual before
attempting service.
16167
Not included
with decal kit
16167
Not included
with decal kit
19791
Not included
with decal kit
16168
Not included
with decal kit
16167
Not included
with decal kit

- 4 -
SPECIFICATIONS
Specifications subject to change without notice
1. Noise levels are based on operating conditions and will vary with background noise
F36/4 F46/4 F46/4HD
Ring Size 36 in 46 in 46 in
Gas Engines
GX160 Honda (9.9 in3/163cc)
GX270 Honda (16.5 in3/270cc)
EX17 Robin(10.3 in3/169cc)
EX21 Robin(12.9 in3/211cc)
GX270 Honda (16.5 in3/270cc)
GX390 Honda (23.7 in3/389cc)
EX21 Robin(12.9 in3/211cc)
EX27 Robin(16.2 in3/265cc)
GX390 Honda (23.7 in3/389cc)
Engine Speed 3400 rpm 3400 rpm 3400 rpm
Trowel Speed 70 - 135 rpm 70 - 135 rpm 70 - 135 rpm
Weight
174 lbs (79 kg) [GX160]
200 lbs (91 kg) [GX270]
174 lbs (79 kg) [EX17]
176 lbs (80 kg) [7EX21]
243 lbs (110 kg) [GX270]
257 lbs (117 kg) [GX390]
224 lbs (102 kg) [EX21]
230 lbs (104 kg) [EX27]
293 lbs (129 kg)
Noise Level185 - 105 dBA 85 - 105 dBA 85 - 105 dBA
)
)

- 5 -
OPERATION
Introduction
MBW equipment is intended for use in very severe
applications. They are powered by four cycle engines and
are available in different sizes and a selection of engines.
This parts manual contains only standard parts. Variations
of these parts as well as other special parts are not included.
Contact your local MBW distributor for assistance in
identifying parts not included in this manual.
Before Starting & Operating
• REMEMBER! It is the owner’s responsibility to
communicate information on the safe use and proper
operation of this unit to the operators.
• Review ALL of the Safety Precautions listed on page 1 of
this manual.
• Familiarize yourself with the operation of the machine
and confirm that all controls function properly.
• Know how to STOP the machine in case of an
emergency.
• Make sure hands, feet, and clothing are at a safe
distance from any moving parts.
• NEW TROWELS - After assembling the handle, inspect
the throttle connections and confirm the remote throttle is
actuating the engine throttle properly and all controls
function properly.
• FUEL SUPPLY - The engines on MBW Power Trowels
require a good grade of unleaded automotive gasoline.
See the engine owner’s manual for specific details.
Engines are NOT approved to run E85 fuel.
• ENGINE OIL - Check the oil level in the engine. Refer to
the Lubrication section of the engine owner’s manual.
• GEARBOX OIL - Check the oil level in the trowel
gearbox. Refer to the Maintenance section of this
manual.
• AIR CLEANER - Check to make sure the element is in
good condition and properly installed. Clean or replace
filter element if clogged or damaged.
Starting Engine
1. Open fuel valve.
2. Turn engine switch to “ON”.
3. Turn trowel safety switch to “ON”.
4. Set throttle to idle.
5. Choke engine if necessary (you may not need to
choke a warm engine).
6. Place one hand on the trowel handle and the other on
the starter rope. Pull starter rope repeatedly until
engine starts.
WARNING
NEVER place foot inside the guard ring when
starting.
7. Move choke lever to open position and allow engine
to warm up for one or two minutes.
Operating
1. Increase throttle to engage the clutch.
2. Set throttle to desired position to achieve the
appropriate trowel blade speed.
3. To move forward, push down on the right handle grip
and pull up on the left handle grip.
4. To move backward, pull up on the right handle grip
and push down on the left handle grip.
5. To move left, pull up on both handle grips.
6. To move right, push down on both handle grips.
Blade Pitch Adjustment (Standard)
1. To increase the pitch, rotate the tilt knob clockwise.
2. To decrease the pitch, rotate the tilt knob
counterclockwise.
Blade Pitch Adjustment (Constant Force)
1. To increase the pitch, squeeze the trigger and pull the
lever towards you.
2. To decrease the pitch, squeeze the trigger and push
the lever away from you.
Handle Bar Adjustment
1. Loosen bolt securing the handle bar to trowel handle.
2. Move handle bar to desired position.
3. Tighten bolt to lock handle.

- 6 -
Stopping Engine
1. Move throttle to idle position.
2. Turn trowel safety switch to “OFF”.
3. Close the fuel valve.
WARNING
Always stop the engine before:
Adding fuel.
Leaving the equipment unattended for any
amount of time.
Before making any repairs or adjustments to the
machine.

- 7 -
MAINTENANCE
WARNING
Always exercise the stopping procedure before
servicing or lubricating the unit.
After servicing the unit, replace and fasten all
guards, shields, and covers to their original
positions before resuming operation.
CAUTION
Always verify fluid levels and check for leaks after
changing fluids.
Do not drain oil onto ground, into open streams,
or down sewage drains.
Maintenance Schedule
1. Check all hardware after the first 5 hours of use, then follow the maintenance schedule.
Fluid Levels
Engine Maintenance
Refer to the engine owner’s manual for maintenance
intervals and procedures.
Engine Oil
Refer to the engine owner’s manual for recommended oil
change intervals.
WARNING
Never change the oil when engine is hot. Allow
engine to cool before maintaining.
To drain the oil, lift and tip the trowel forward onto the guard
ring using the trowel handle. Place a drain pan underneath
the engine and remove the drain plug. After the oil has
finished draining, reinstall the plug and clean any spilled oil
from the trowel.
Engine Speed
The engine speed is factory preset according to the
Specifications section. Do not tamper with the governor
settings. The governor establishes safe operating limits.
These limits must not be exceeded.
Cleaning
Always clean the trowel thoroughly after each day’s
operation. Dried concrete buildup can hinder performance
and shorten the life of the trowel.
Lubrication
1. Grease the yoke plate and spider (see Spider
Assembly, page 16) every 10 hours or daily with a
lithium base, low temperature, general purpose lube.
2. Change the gearbox oil once every season or 500
hours, whichever comes first. The drain/fill plug is
located on the right-hand side of the gearbox. Fill it
with 21 oz. (620 ml) of MBW Worm Gear Oil (MBW
MAINTENANCE 10 HOURS OR
DAILY
50 HOURS OR
WEEKLY
100 HOURS OR
MONTHLY
500 HOURS OR
YEARLY
Grease yoke plate X
Grease spider X
Change gearbox oil X
Check gearbox oil X
Inspect drive belt X
Check and tighten all hardware1X
SYSTEM FLUID VOLUME RECOMMENDED OIL
Gearbox Oil 21 oz. (620 ml) #680 140wt Sulfur Free (MBW #05700)
Engine Refer to engine operator/owner manual

- 8 -
#05700). The oil should be to the bottom of the fill
hole when sitting level.
Lifting
The trowel should be lifted by the lifting bracket attached to
the engine. As an alternative, it may be lifted by two people
on opposite sides of the guard ring.
Storage
The trowel should be stored with blocks supporting the outer
guard ring. Refer to the engine owner’s manual for
information regarding storage of the engine.
Changing Trowel Blades
WARNING
Trowel blade edges may be sharp when they are
worn. Wear protective gloves when handling the
blades.
1. Set the trowel on a level surface.
2. Remove the bolts securing the blade to the tilt arm.
3. Lift up on the ring guard and slide the blade out from
under the tilt arm.
4. Slide the new blade under the tilt arm.
5. Reinstall the bolts and tighten.
6. Check that the carriage bolts are set properly. If they
require adjustment refer to the “Setting Tilt Arm
Carriage Bolt Height” section.
Setting Tilt Arm Carriage Bolt Height
1. Remove ALL the tilt arms from the spider.
2. Remove the blades from all the arms. Wear
protective gloves when removing the blades, the
edges may be sharp
3. Inspect the bottom side of the arms (blade mounting
surface). Remove any nicks, cement, etc... THIS
SURFACE MUST BE FLAT
4. Loosen the jam nut and run the carriage bolt in as far
as possible.
5. Mount the arm to gage #07277 as shown in figure 4.
6. Place a .030 feeler gage between the carriage bolt
and the underside of the gage arm, and run the
carriage bolt up to just contacting the feeler gage.
There should be a slight drag felt when the feeler
gage is moved between the two surfaces.
7. Place a 3/8” open end wrench on the square shoulder
of the carriage bolt and tighten the jam nut. DO NOT
allow the carriage bolt to turn.
8. Recheck clearance with feeler gage and readjust if
necessary.
9. Repeat items 5 through 8 for ALL remaining tilt arms.
10. Lubricate the tilt arm prior to fitting it in spider.
Figure 4

- 9 -
SERVICE
Assembly and disassembly should be performed by a
service technician who has been factory trained on MBW
equipment. The unit should be clean and free of debris.
Pressure washing before disassembly is recommended.
• Prior to assembly, wash all parts in a suitable cleaner or
solvent.
• Check moving parts for wear and failure. Refer to the
Replacement section in this manual for tolerance and
replacement cycles.
• All shafts and housings should be oiled prior to pressing
bearings. Also, ensure that the bearings are pressed
square and are seated properly.
• All bearings, seals, o-rings and gaskets should be
replaced when rebuilding gearbox.
Torque Chart
Service Tools
Gearbox Disassembly
Refer to Gearbox Assembly, page 14.
1. Remove the handle, belt guard & drive assembly
(page 18), engine & guard ring (page 20).
2. Loosen the square head set screw (page 16, #20)
until the gearbox housing can be lifted off the spider
assembly.
3. Flip the gearbox housing (#7) over and set it on the
four guard ring pads.
4. Remove the yoke arm (#9) by removing one of the
retaining rings (#6), holding the pivot rod (#12) and
sliding the rod out of the holes.
5. Remove the two flange bolts (#24) and the two flat
head screws (#25) that hold the cover (#8) to the
gearbox housing (#7).
6. Remove the cover and discard the shims (#11) and
the o-ring (#5).
7. Pull out the shaft (#14) with the bearings (#3) and the
worm gear (#13) and drain oil out of gearbox.
8. Press bearing (#3) and worm gear (#13) off long side
of shaft (#14).
9. Remove key (#15) and retaining ring (#2) from shaft.
10. Press remaining bearing (#3) off of shaft.
11. Remove the four flange bolts (#23) and the bearing
cap (#20). Discard the shim gasket (#10) and the
o-ring (#17).
12. Remove the worm shaft (#19) and the bearings (#22).
13. Remove the retaining cap (#21) and discard the shim
gasket (#10) and the o-ring (#17).
Gearbox Assembly
Refer to Gearbox Assembly, page 14.
1. Lightly oil the shaft (#14). Install the key (#15) and
the retaining ring (#2) onto the shaft.
2. With the retaining ring end of the shaft down, press
the worm gear (#13) onto the shaft. Make sure the
SIZE GRADE 2 GRADE 5 GRADE 8
1/4-20 49 in•lbs 76 in•lbs 9 ft•lbs
1/4-28 56 in•lbs 87 in•lbs 10 ft•lbs
5/16-18 8 ft•lbs 13 ft•lbs 18 ft•lbs
5/16-24 9 ft•lbs 14 ft•lbs 20 ft•lbs
3/8-16 15 ft•lbs 23 ft•lbs 33 ft•lbs
3/8-24 17 ft•lbs 26 ft•lbs 37 ft•lbs
7/16-14 24 ft•lbs 37 ft•lbs 52 ft•lbs
7/16-20 27 ft•lbs 41 ft•lbs 58 ft•lbs
1/2-13 37 ft•lbs 57 ft•lbs 80 ft•lbs
1/2-20 41 ft•lbs 64 ft•lbs 90 ft•lbs
9/16-12 53 ft•lbs 82 ft•lbs 115 ft•lbs
5/8-11 73 ft•lbs 112 ft•lbs 159 ft•lbs
5/8-18 83 ft•lbs 112 ft•lbs 180 ft•lbs
3/4-16 144 ft•lbs 200 ft•lbs 315 ft•lbs
1-8 188 ft•lbs 483 ft•lbs 682 ft•lbs
1-14 210 ft•lbs 541 ft•lbs 764 ft•lbs
1-1/2-6 652 ft•lbs 1462 ft•lbs 2371 ft•lbs
M 6 3 ft•lbs 4 ft•lbs 7 ft•lbs
M 8 6 ft•lbs 10 ft•lbs 18 ft•lbs
M 10 10 ft•lbs 20 ft•lbs 30 ft•lbs
CONVERSIONS
in•lbs x 0.083 = ft•lbs
ft•lbs x 12 = in•lbs
ft•lbs x 0.1383 = kg•m
ft•lbs x 1.3558 = N•m
Part No. Description
07276 Adjustment Tool, Tilt Arm Parallelism
07277 Adjustment Tool, Tilt Arm Height Gage
07279 Installation Tool, Spider Bushing (#06459)
16421 Bearing Spool Tool (Constant Force)

- 10 -
longer hub of the worm gear is down. The worm gear
should be pressed on the shaft until the recess in the
worm gear hub is snug against the retaining ring.
3. Press one bearing (#3) on each end of the shaft.
Make sure the bearings are butted against the worm
gear shoulders.
4. If the bearing races are replaced make sure the new
races are properly seated.
5. Set the worm gear and the shaft assembly into the
gearbox housing and put cover (#8) and one .010”
shim #05401 (#11) into place.
6. Apply down pressure to cover (#8) and check shaft
(#14) for end play.
7. Remove the cover and install the proper shims (#11)
for no end play.
8. Brush a light coat of oil on the o-ring groove and
inside the lip of the cover. Roll the o-ring (#5) over the
inside lip and into the groove in the cover. Install the
seal (#1) into the cover from the outside and make
sure it is installed square and flat.
9. Use a piece of thin plastic over the shaft to protect the
seal and install the cover into the gearbox housing
and secure it with two flange bolts (#24) and two flat
head screws (#25).
10. Rotate the shaft, there should be a little drag. If there
is too much drag another shim should be added until
a slight seal drag is felt. If there is side play in the
shaft a shim must be removed.
11. Measure the main shaft run out. Maximum
acceptable total indicator run out is .0035 inches.
12. Install the drain plug (#26) and relief valve (#16) if
removed. Use pipe sealant on the threads before
installation.
13. Brush a light coat of oil on the o-ring (#17). Roll it
over the inside lip and into the groove of the retaining
cap (#21).
14. Install two .010” shims #05360 (#10) with the
retaining cap on the drain plug side of the gearbox
housing with four flange bolts (#23). Torque the bolts
to 90 in/lbs in an “X” pattern.
15. Press one bearing (#22) on each end of the worm
shaft (#19). Make sure the bearings are butted
against the worm shaft steps.
16. Install the worm shaft (#19) with the bearings (#22)
into the gearbox housing. The gears must be
meshed properly.
17. Install the bearing cap (#20) and apply pressure
towards gearbox (#7). Rotate the worm shaft and
check for end play and gear backlash.
18. Remove the bearing cap and install the proper shims
(#10) for no back lash & no end play.
19. Remove cover and install the proper shims (#10) for
no back lash and end play.
20. Install a new seal (#18) into the bearing cap (#21)
from the outside. Make sure the seal is installed
square and flat.
21. Brush a light coat of oil on the o-ring groove. Roll the
o-ring (#17) over the inside lip and into the groove of
the bearing cap.
22. Pour one can (21 oz.) of #05700 oil into the worm
shaft bearing cap opening. Install the cap and secure
it with four flange bolts (#23). Torque the bolts to 90
in/lbs in an “X” pattern.
CFP Handle Cable/Spring Replacement
Refer to Constant Force Handle Assembly, page 24.
1. Remove handle assembly from machine.
2. Support handle assembly in a vise to secure for
disassembly.
3. Loosen handle pivot bolt (#41) and fold handle
forward.
4. Remove the four bolts (#32) on the back of the
springbox.
5. Carefully rotate lever (#19) arm backwards until you
feel the cable tension release. When it releases there
will be no spring tension on the lever (#19) in either
direction.
6. Remove spring retainer bolt (#45) and end covers
(#26).
7. Remove remaining two bolts (#33) to separate spring
box (#25) from handle.
8. With a long needle nose pliers, disconnect the cable
from the spring.
9. If you are only replacing spring (#28) proceed with
step 10. If you are replacing cable and/or clevis refer
to step 13.
10. Note orientation of spring assembly. Remove
bearing spool (# 29) by pushing it out either side.
11. Remove spring assembly by forcing it out either side.
12. Refer to step 18 for assembly.
13. Push threaded portion of cable into tube.
14. Slide clevis assembly out of tube toward the bottom.
15. Remove cable from tube.
16. Route barrel end of new cable into tube.
17. Route threaded portion of the cable over the pulley on
clevis and back into the tube. Guide the threaded
end through the slot in the handle as you insert clevis
into the handle tube. Insert one of the handle bolts
through the clevis mounting holes to hold it in place.
See figure 7.
18. Install spring (#28) into spring box (#25). Note
bearing spool must be removed to get spring into
housing.

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19. Install bearing spool into spring with #16421 tool.
Tighten a nut on the threaded rod of the tool against
the cover of the spring box to pull the tapered pin into
the spring. Once the spring is spread, the spool can
be inserted behind the tapered pin and the tool can
be removed.
20. Hook cable end to spring (#28) and route cable
around activating cam (#18).
21. Install spring box side covers (#26) and secure in
place with hardware.
22. Mount spring box onto handle using center mount
point only. Align rear mounting holes but do not
install bolts. Tighten center mount bolts.
23. To engage cable pin in activating cam slot it will be
necessary to apply tension to the threaded portion of
the cable. This can be done by tightening a nut
against a spacer, such as a deepwell socket, on the
threaded end. While applying tension, rotate the
lever arm backwards until you feel the cable pin snap
into its slot. Once in place you will have constant
tension on the lever arm. Rotate the lever arm
forward and release the trigger to lock the lever.
24. Install the remaining 4 bolts (#32).
25. Tighten the handle pivot bolt (#41).
26. Install handle on trowel.
Standard Handle Pitch Cable Replacement
Refer to Handle Assembly, page 22.
1. Remove handle assembly from trowel.
2. Remove switch assembly (#11). It is not necessary
to disconnect the wire.
3. Turn pitch control knob all the way counterclockwise.
4. Spiral pin (#27) should be aligned with hole on left
and slot on right.
5. Drive pin out toward the slot just far enough to
unhook cable.
6. Slide clevis (#5) out of the tube and remove cable.
7. Since it is not possible to thread the cable while the
clevis is in the tube, it must be put through the pulley
with the clevis removed.
8. Route both ends of the cable into the bottom of the
tube. The threaded end must come out of the slot.
9. Insert clevis with cable into tube. Use a handle bolt
to hold clevis in place.
10. Push cable up align eyelet with spiral pin hole.
11. Press spiral pin in flush with outside of slot on handle.
12. Install switch on handle.
13. Install handle on trowel.
Spider Bushing Removal
Refer to Figure #8
1. Screw a 3/4-14 pipe tap about half way into the worn
outer bushing.
2. Insert a 3/4” x 8 1/2” push rod into the opposite side
of the spider.
3. Use a 1 1/4” x 4” tube on upper end to press old
bushings out.
4. Repeat with inner bushings.
16421
Figure 5
SPACER
NUT
ROTATE HANDLE ONCE TENSION
IS APPLIED TO CABLE
Figure 6
Figure 7

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Spider Bushing Replacement
Refer to Figure #9 for bushing installation:
1. Install (4) inner bushings into spider, using long side
of installation tool #60703 to ensure proper bushing
depth.
2. Using the opposite end or short end of installation tool
#06703, install (4) outer bushings into spider.
Parts Replacement Cycles and Tolerances
3/4 - 14 PIPE TAP
TUBE 1 1/4 I.D. X 4" LONG
6459 BUSHING
PUSH ROD 3/4" X 8 1/2"
Figure 8
#06703
Inner Bushing Outer Bushing
#06703
Figure 9
Air Cleaner Element Replace after 100 hours if the engine is operating under good clean air conditions.
Service and replace more frequently if under more severe conditions.
Bearings Replace anytime a bearing is rough, binding, discolored or removed from housing or
shaft.
Blades Replace when the edges become sharp or uneven. (Finish blades can be reversed)
Bushings, Trowel Arm Replace if the trowel arm can be moved up and down more than 3/4 inch (19 mm) at
the end of the arm.
Carriage Bolts Reset the height after trowel arm teardown or if the trowel develops chatter or
windmilling. Use height gage kit #07277 when setting.
Clutch Replace clutch if it does not disengage below 2000 rpm.
Gaskets and Seals Replace at every overhaul and teardown. Use MBW gasket and seal kit #05470.
Gearbox Oil Replace after the first 50 hours of operation, then every 500 operating hours or yearly
thereafter.
Spark Plug Change after 75 hours of operation.
Torque Bolts Re-torque all the bolts after the first eight hours of operation and check every 25
hours thereafter.
Worm Gear Replace if the teeth show wear marks or become sharp.
Worm Shaft Replace if the teeth show wear marks or become sharp.

- 13 -
MBW, Inc.
250 Hartford Rd • PO Box 440
Slinger, WI 53086-0440
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.mbw.com
MBW (UK) Ltd.
Units 2 & 3
Cochrane Street
Bolton BL3 6BN, England
Phone: [phone]
Fax: [phone]
Contact Information
MBW France S.A.R.L
Z.A. d’Outreville
11 rue Jean Baptiste Néron,
60540 BORNEL
France
Phone: [phone]
Fax: [phone]
REPLACEMENT PARTS
The warranty is stated in this book on page 24. Failure to
return the Warranty Registration Card renders the warranty
null and void.
MBW, Inc. has established a network of reputable
distributors with trained mechanics and full facilities for
maintenance and rebuilding, and to carry an adequate parts
stock in all areas of the country. Their sales engineers are
available for professional consultation. If you cannot locate
an M-B-W distributor in your area, contact MBW, Inc. or one
of our Sales Branches listed below.
When ordering replacement parts, be sure to have the
following information available:
• Model and Serial Number of machine when ordering
M-B-W parts
• Model and Serial Number of engine when ordering
engine parts
• Part Number, Description, and Quantity
• Company Name, Address, Zip Code, and Purchase
Order Number
• Preferred method of shipping
REMEMBER - You own the best! If repairs are needed,
use only M-B-W parts purchased from authorized
M-B-W distributors.
The unit’s serial number can be found in the following
locations:
• The model/serial number decal is located on the rear
side of the gearbox, next to the engine and beltguard.
• The serial number is stamped on the front of the gearbox.
Write Model Number here
Write Serial Number here
'(&$//2&$7,21
67$03('
/2&$7,21

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Gearbox Assembly

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ITEM PART NO. DESCRIPTION QTY
1. 01243 SEAL, GEAR SHAFT 1
2. 01244 RETAINING RING, EXTERNAL 1
3. 01251 BEARING TAPER ROLLER (Includes Bearing & Cup) 2
4. 01254 KEY, 5/16 SQUARE x 2 lg. 1
5. 01256 O-RING 1
6. 01279 RETAINING RING, EXTERNAL 2
7. 05323 HOUSING, GEARBOX 1
8. 05326 COVER, GEARBOX 1
9. 05329 ARM, YOKE 1
10. 05359 SHIM GASKET, 0.004”
05360 SHIM GASKET, 0.010”
11. 05361 SHIM GASKET, 0.004”
05401 SHIM GASKET, 0.010”
12. 05396 ROD, PIVOT 1
13. 05521 GEAR, WORM 1
14. 05523 SHAFT, OUTPUT 1
15. 05524 KEY, 5/16” SQUARE x 1-11/16” LONG 1
16. 06037 VALVE, RELIEF 1
17. 06392 O-RING 2
18. 11075 SEAL, INPUT SHAFT 1
19. 19637 WORM SHAFT 1
20. 19638 BEARING CAP 1
21. 19639 CAP, RETAINING 1
22. 19687 BEARING TAPER ROLLER (Includes Bearing & Cup) 2
23. F042007FWS FLANGE BOLT, 1/4-20 x 7/8” 8
24. F051807FWS FLANGE BOLT, 5/16-18 x 7/8” 2
25. F051808FSS FLAT HEAD SCREW, 5/16-18 x 1” 2
26. F0618SHPP PIPE PLUG, 3/8” 1
REPLACEMENT KITS
19940 KIT, GASKET & SEAL (includes 1, 11, 12, 18 & 19)
19636 GEARBOX ASSEMBLY (includes all above items)
05700 GEAR OIL, CHEVRON #680

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Spider Assembly

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ITEM PART NO. DESCRIPTION
F36/4 F46/4
1. 01169 GREASE FITTING, 45 4 4
2. 01177 GREASE FITTING, STRAIGHT 1 1
3. 01258 SPRING 44
4. 01280 SOCKET HEAD SHOULDER SCREW, 3/8” x 3/8” 4
5. 05324 YOKE PLATE 1 1
6. 05330 PRESSURE PLATE, 4-ARM* 1 1
7. 05331 SPIDER, 4-ARM (includes 14)* 1 1
8. 05347 FINISH BLADE, 6” x 14” 4
05383 FINISH BLADE, 6” x 18” 4
9. 05356 BEARING 1 1
10. 05397 BOLT, HOLLOW 4 4
11. 05402 COMBINATION BLADE, 8” x 14” 4
05412 COMBINATION BLADE, 8” x 18” 4
12. 05403 FLOAT BLADE, 10” x 14” 4
07935 FLOAT BLADE, 10” x 18” 4
13. 05968 CAPLUG (set of 12) 4 4
14. 06459 BUSHING, SPLIT 8 8
15. 06755 TILT ARM, 36” (includes 17 & 21) 4
07850 TILT ARM, 46” (includes 17 & 21) 4
16. 07870 STABILIZER, 4-ARM* 1
17. 17190 CARRIAGE BOLT (SPECIAL), 3/8-16 x 1-1/4” 4 4
18. F051812HCS HEX HEAD CAP SCREW, 5/16-18 x 1-1/2” 8 16
19. F05LW LOCKWASHER, 5/16” 8 16
20. F061614SHS SQUARE HEAD SET SCREW, 3/8-16 x 1-3/4” 1 1
21. F0616HN HEX NUT, 3/8-16 4 4
22. F06LW LOCKWASHER, 3/8” 4 4
REPLACEMENT KITS
01427 GREASE FITTING CAPS (sold in sets of 12) 5 5
06199 SPIDER & ARM ASSEMBLY, 4-ARM (includes 1, 3, 7, 10, 15, 20 & 22) 1
07898 SPIDER & ARM ASSEMBLY, 4-ARM (includes 1, 3, 7, 10, 15, 20 & 22) 1
07524 PRESSURE PLATE ASSEMBLY, 4-ARM (includes 5, 6 & 9) 1 1
*3-arm parts are no longer available, order 4-arm parts