MULTIQUIP BS90C Guide

OPERATION AND PARTS MANUAL
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
To find the latest revision of this
publication, visit our website at:
www.multiquip.com
MODEL BS90C
WALK-BEHIND TROWEL
(SUBARU EX270DE5013 GASOLINE ENGINE)
Revision #0 (9/4/15)
P/N 30226
Original Version

PAGE 2 — BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)
its constituents, and some dust created
of California to cause cancer, birth
defects and other reproductive harm.
by power sanding, sawing, grinding,
drillingandotherconstructionactivities
contains chemicals known to the State
Some examples of these chemicals are:
Leadfromlead-basedpaints.
Crystallinesilicafrombricks.
Cementandothermasonryproducts.
Arsenicandchromiumfromchemically
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, suchas
dust masks that are specially designed
to filter out microscopic particles.
Gasoline engine exhaust and some of
FUEL AND CHEMICAL EXPOSURE WARNINGS

BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)— PAGE 3
Grinding/cutting/drilling of masonry, concrete, metal and
other materials with silica in their composition may give
off dust or mists containing crystalline silica. Silica is a
basic component of sand, quartz, brick clay, granite and
numerous other minerals and rocks. Repeated and/or
substantial inhalation of airborne crystalline silica can
cause serious or fatal respiratory diseases, including
silicosis.Inaddition, California and some other
authorities have listed respirable crystalline silica as a
substance known to cause cancer. When cutting such
materials, always follow the respiratory precautions
mentioned above.
WARNING
Grinding/cutting/drilling of masonry, concrete, metal and
other materials can generate dust, mists and fumes
containing chemicals known to cause serious or fatal
injury or illness, such as respiratory disease, cancer,
birth defects or other reproductive harm. If you are
unfamiliar with the risks associated with the particular
process and/or material being cut or the composition of
the tool being used, review the material safety data
sheet and/or consult your employer, the material
manufacturer/supplier, governmental agencies such as
OSHA and NIOSH and other sources on hazardous
materials. California and some other authorities, for
instance, have published lists of substances known to
cause cancer, reproductive toxicity,or other harmful
effects.
Control dust, mist and fumes at the source where
possible. In this regard use good work practices and
follow the recommendations of the manufacturers or
suppliers, OSHA/NIOSH, and occupational and trade
associations.Water should be used for dust
suppression when wet cutting is feasible. When the
hazards from inhalation of dust, mists and fumes cannot
be eliminated, the operator and any bystanders should
always wear a respirator approved by NIOSH/MSHA for
the materials being used.
WARNING
SILICOSIS WARNING RESPIRATORY HAZARDS
SILICOSIS/RESPIRATORY WARNINGS

PAGE 4 — BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)
TABLE OF CONTENTS
NOTICE
Specifications and part numbers are subject to change
without notice.
BS90C WALK-BEHIND
TROWEL
Fuel And Chemical Exposure Warnings.................. 2
Silicosis/Respiratory Warnings ................................ 3
Table Of Contents.................................................... 4
Parts Ordering Procedures...................................... 5
Training Checklist .................................................... 6
Daily Pre-Operation Checklist ................................. 7
Safety Information .............................................. 8-12
Trowel Specifications/Dimensions ......................... 13
Engine Specifications ............................................ 14
General Information............................................... 15
Trowel Components.......................................... 16-17
Engine Components.............................................. 18
Assembly And Installation ................................ 19-23
Inspection ......................................................... 23-24
Operation.......................................................... 25-29
Options ............................................................. 30-31
Maintenance..................................................... 32-40
Troubleshooting ................................................ 41-44
Wiring Diagram...................................................... 45
Explanation Of Code In Remarks Column............. 46
Suggested Spare Parts ......................................... 47
Component Drawings
Nameplates And Decals................................... 48-49
Standard Handle Assembly.............................. 50-53
Quick Pitch Handle Assembly .......................... 54-57
Guard Ring And Engine Mounting Assembly ... 58-59
Stabilizer Ring Assembly.................................. 60-61
Gearbox Assembly ........................................... 62-63
Engine And Clutch Assembly ........................... 64-65
Spider Assembly............................................... 66-67
Blades And Pan Assembly ............................... 68-69
Honda GX270UT2QA2 Gasoline
Engine
Crankcase Assembly........................................ 70-71
Crankshaft Assembly........................................ 72-73
Muffler Assembly .............................................. 74-75
Air Cleaner Assembly....................................... 76-77
Governor Assembly .......................................... 78-79
Blower Assembly .............................................. 80-81
Recoil Starter Assembly ................................... 82-83
Fuel Tank Assembly.......................................... 84-85
Carburetor Assembly........................................ 86-87
Ignition Coil Assembly ...................................... 88-89
Oil Sensor Assembly ........................................ 90-91
Terms And Conditions Of Sale — Parts ................ 92

BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)— PAGE 5
PARTS ORDERING PROCEDURES
www.multiquip.com
Ordering parts has never been easier!
Choose from three easy options:
WE ACCEPT ALL MAJOR CREDIT CARDS!
When ordering parts, please supply:
❒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:
✓ UPS/Fed Ex ✓DHL
■Priority One ✓Tr u ck
■Ground
■Next Day
■Second/Third Day
If you have an MQ Account, to obtain a Username
and Password, E-mail us at:
parts@multiquip.
com.
To obtain an MQ Account, contact your
District Sales Manager for more information.
Order via Internet (Dealers Only):
Order parts on-line using Multiquip’s SmartEquip website!
■View Parts Diagrams
■Order Parts
■Print Specification Information
Note: Discounts Are Subject To Change
Goto www.multiquip.com and click on
Order Parts to log in and save!
Use the internet and qualify for a 5% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Fax (Dealers Only):
All customers are welcome to order parts via Fax.
Domestic (US) Customers dial:
1-800-6-PARTS-7 (800-672-7877)
Fax your order in and qualify for a 2% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Phone: Domestic (US) Dealers Call:
1-800-427-1244
Best Deal!
International Customers should contact
their local Multiquip Representatives for
Parts Ordering information.
Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.
Note: Discounts Are Subject To Change
Effective:
January 1st
, 2006
NOTICE
All orders are treated as Standard Orders and will
ship the same day if received prior to 3PM PST.

PAGE 6 — BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)
TRAINING CHECKLIST
Training Checklist
No. Description OK? Date
1Read operation manual
completely.
2
Machine layout, location of
components, checking of engine
oil level.
3 Fuel system, refueling procedure.
4Operation of controls (machine
not running).
5Safety controls, safety stop switch
operation.
6 Emergency stop procedures.
7 Startup of machine, engine choke.
8 Maintaining a hover.
9 Maneuvering.
10 Pitching.
11 Concrete finishing techniques.
12 Shutdown of machine.
13 Lifting of machine (lifting bale).
14 Machine transport and storage.

BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)— PAGE 7
DAILY PRE-OPERATION CHECKLIST
Daily Pre-Operation Checklist      
1 Engine oil level
2 Gearbox oil level
3 Condition of blades
4 Blade pitch operation
5 Safety stop switch operation

PAGE 8 — BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)
SAFETY INFORMATION
Do not operate or service the equipment before reading
the entire manual. 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.
SAFETY MESSAGES
The four 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 four words:
DANGER, WARNING, CAUTION
or NOTICE.
SAFETY SYMBOLS
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
NOTICE
Addresses practices not related to personal injury.
Potential hazard associated with the operation of this
equipment will be referenced with hazard symbols
which
may appear throughout this manual in conjunction with
safety messages.
Warning decals
associated with the operation of this
equipment are defined below:
Inhaling exhaust fumes can result in severe
injury or death.
Only operate equipment in well ventilated areas.
inhale exhaust gases/fumes.DO NOT
WARNING
Lethal Exhaust Gas Hazard
HOT PARTS can burn skin.
CAUTION
Burn Hazard
touch hot parts. Allow machine a sufficient
amount of time to cool before performing maintenance.
DO NOT
Gasoline fuel can cause fire or explosion. Stop
engine before refueling.
Keep cigarettes, sparks and flames away from hot
surfaces.
WARNING
Explosive Fuel Hazard
SYMBOL SAFETY HAZARD
Keep hands and feet clear of guard rings.
Stop engine before servicing.
WARNING
Rotating Blade Hazard
To avoid injury you must read and
understand operator’s manual before
using this machine.
P/N 23700
allow any person
to stand underneath the trowel while lifting.
NEVER
P/N 36099
ALWAYS wear protective clothing when
operating this equipment
This machine to be operated by qualified
personnel. Ask for training as needed.
Lifting Crush Hazard
lift trowel with pans attached.DO NOT
WARNING
WARNING
Read Manual
NEVER operate this equipment with guards
removed. Keep hands clear.
WARNING
Training
Guard Hazard
WARNING
make sure handle is securely attached.
On Quick Pitch™ models make sure T-Handle
latch is locked (engaged).
ALWAYS
DECAL SAFETY HAZARD

BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)— PAGE 9
SAFETY INFORMATION
GENERAL SAFETY
CAUTION

NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.

Avoid wearing jewelry or loose fitting clothes that may
snag on the controls or moving parts as this can cause
serious injury.

NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.

NEVER operate this equipment under the
influence of drugs or alcohol.

ALWAYS clear the work area of any debris, tools, etc.
that would constitute a hazard while the equipment is
in operation.

No one other than the operator is to be in the working
area when the equipment is in operation.

DO NOT use the equipment for any purpose other than
its intended purposes or applications.
NOTICE

This equipment should only be operated by trained and
qualified personnel 18 years of age and older.

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.

Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.
NEVER
use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fire extinguisher.
ALWAYS know the location of the nearest
first aid kit.
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.

PAGE 10 — BS90C WALK-BEHIND TROWEL • OPERATION AND PARTS MANUAL — REV. #0 (9/4/15)
SAFETY INFORMATION
TROWEL SAFETY
DANGER

Engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
cause death if inhaled.

The engine of this equipment requires an adequate free
flow of cooling air. NEVER operate this equipment in any
enclosed or narrow area
where free flow of the air is
restricted. If the air flow is
restricted it will cause injury
to people and property and
serious damage to the
equipment or engine.

NEVER operate the equipment in an explosive
atmosphere or near combustible materials.An
explosion or fire could result causing severe
bodily harm or even death.
WARNING

ALWAYS keep clear of rotating or moving
parts while operating the trowel.

DO NOT start or operate the trowel if the
drive train will not disengage. Centrifugal
force between the trowel and surface when starting can
cause uncontrolled handle movement that can cause
serious injury. The handle must not move while pulling
the engine recoil starter.

NEVER disconnect any emergency or safety devices.
These devices are intended for operator safety.
Disconnection of these devices can cause severe injury,
bodily harm or even death. Disconnection of any of these
devices will void all warranties.
CAUTION

NEVER stand on trowel during operation.

NEVER lubricate components or attempt service on a
running machine.

NEVER place your feet or hands inside the guard rings
while starting or operating this equipment.
DANGEROUS
GAS FUMES
K
E
E
P
C
L
E
A
R
ALWAYS keep work area
clear around the trowel.
Make sure it is free of
debris and objects.
NOTICE
ALWAYS keep the machine in proper running condition.

Fix damage to machine and replace any broken parts
immediately.
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 and unauthorized personnel.

A safety manual for operating and maintenance
personnel of concrete power trowels produced by the
Association of Equipment Manufacturers (AEM) can be
obtained for a fee by ordering through their website at
www.aem.org.
Order FORM PT-160
ENGINE SAFETY
WARNING
DO NOT
place hands or fingers inside engine
compartment when engine is running.
NEVER
operate the engine with heat shields or
guards removed.
Keep fingers, hands hair and clothing away
from all moving parts to prevent injury.
DO NOT remove the engine oil drain plug
while the engine is hot. Allow the oil to cool before
performing maintenance. This will prevent scalding of
personnel.
CAUTION
NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to cool
before servicing equipment.