MBW MK8 75 User Manual

OPERATOR’S SAFETY

AND SERVICE MANUAL

MK8 75

This manual covers the following serial numbers
and higher for each model listed:

MK8-75 . . . . . . . . . . . . . . . . . . 1780001

RIDE ON TROWELS

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]

L18872 / 05.06.B

©MBW, Inc. 2006

Printed in the USA

TABLE OF CONTENTS

Safety Information . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 3

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Before Starting & Operating . . . . . . . . . . . . . . . . . . . . 4

Starting Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Stopping Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Stopping in emergency conditions: . . . . . . . . . . . . . . . 5

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . 6

Fluid Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Engine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Engine Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Reduction Gear Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Changing Trowel Blades . . . . . . . . . . . . . . . . . . . . . . 7

Replacing The Belts . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Replacing The Floats . . . . . . . . . . . . . . . . . . . . . . . . . 7

Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Torque Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Parts Replacement Cycles and Tolerances . . . . . . . . 8

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . 9

Main Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Control Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Right Blade and Gearbox Assembly . . . . . . . . . . . . 13

Left Blade and Gearbox Assembly. . . . . . . . . . . . . . 14

Engine Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

WARNING

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.

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).

- 1 -

CAUTION

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.
Wear approved hearing protection,
foot protection, eye protection and
head protection.

SHUT OFF the motor before servic­ing or cleaning.

STOP

DO NOT RUN in an enclosed area.
The engine produces carbon
monoxide, a POISONOUS GAS.

Failure to comply could result in serious

bodily injury.

13483

UNLEADED
GASOLINE

17892

17892

13483

18904 (NOT IN DECAL SET)

WARNING

OPERATING
INSTRUCTIONS

1. READ OWNER’S MANUAL before attempting to start or operate this
machine.

2. Check engine oil and trowel gearbox oil.

3. Put engine switch to on.

4. Set throttle at idle position.

5. Choke engine. A warm engine may not need to be choked.

6. Hold at least one safety switch. Turn key to ‘Start’ position.

7. After starting: open choke and allow engine to warm up at idle.

8. Position throttle for various operating
conditions.

9. TO STOP: Return throttle to idle position; Release both safety
switches; Turn key to ‘Off’ position.

18005

CAUTION

ROTATING

BLADES CAN

CRUSH AND CUT

KEEP HANDS

18031

CLEAR!

18031

ROTATING PARTS
can crush and cut.

Keep hands away!

12573

12573

18005

CAUTION

Machine may fall and cause

injury or damage if lifted
improperly.

Lift only by lift hooks

Weight~ #660 (300kg)

18004

18762

Safety Decals (Decal Set #18007)

ENGINE

OIL DRAIN

18006

18006

09867

09867

(NOT IN DECAL SET)

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SPECIFICATIONS

MK8 75

Dimensions 61 x 30.7 x 41in. (1550x780x970mm)

Weight 374.8lbs. (170kg)

Motor Honda 13HP

Max Engine RPM 3600 RPM

Min / Max Blade RPM 70 / 130 RPM

Rotor Diameter 29.5in. (750mm)

Max Forward Speed 295 ft./min. (90 m/min.)

Acoustic Level At Drivers

Seat

Trowe l Pa th 76in. (1930.4mm)

Specifications subject to change without notice

97.1 (dB)

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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.

• OIL LEVEL - Check the oil level in the engine. For more
information see “Lubrication” under the respective
engine’s “Owners Manual” or the Maintenance section of
this manual.

Starting Engine

1. Close the choke. Choking may not be necessary on
warm engines.

2. Leave throttle, turn engine switch to run.

3. Hold one emergency stop lever closed and pull recoil
until engine starts.

4. Open the choke once engine is warm.

Operating

CAUTION

To avoid premature clutch wear it is necessary to
accelerate quickly upon start up then back the
throttle off to the desired speed after the clutch is
fully engaged.

To drive the machine in the desired direction, there are two
control levers. Move the controls slowly and smoothly. To
stop the float machine return the control levers to the rest
position. The control lever positions and the relevant
movements are described on page 5 of this manual.

Preparing the surface:

Use a mechanical vibrating float or manual float to level the
floor surface in order to obtain a well-compacted concrete
footing and thus prepare the ideal surface for floating and
finishing. The float machine does not improve flatness of a
badly floated or uneven floor.

• AIR CLEANER - Check to ensure element is in good
condition and properly installed.

• FUEL SUPPLY - The engines on MBW equipment
require an automotive grade of clean, fresh, unleaded
gasoline.

• FUEL FILTER - If clogged or damaged, replace.

• Make sure the machine is on a flat surface with a working
area of at least 3,000 square feet, and that there is a
sufficient area around the machine. (at least 6 ft.)

• See that the blade is inclined by at least 1/2” in order to
have better control over the float machine when starting.

• Adjust seat if necessary.

• Make sure the two drive control levers are vertical and
adjust if necessary.

Floating phase:

The floor is ready for the first pass when the imprint of the
shoe heel sinks into the concrete by about 1/8” when
walking on it.

On average about 2700-3200 square feet of surface are
floated in 10 minutes. Speed varies with conditions.

When the concrete is still fresh, take care not to work
continuously on the same spot since, due to the weight of
the float machine, you may create an uneven floor surface.

During the floating phase the floats must not chatter on the
surface; this might be caused by dirt between the blades
and the floats.

Finishing phase:

When floating has been completed, detach the floats from
the blades and clean the cement that has collected during
the floating phase off the blades, the spider and the
protection rim. Turn the blade-lifting knob clockwise until the
blades are inclined by about 1/2” for the first pass; for the

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