Crown WBT36 Service manual

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Operator’s Safety and Service
WBT Power Trowels
WBT36/WBT46
It is the OWNER´S RESPONSABILITY to communicate information on the
SAFE USE and OPERATION of this machine to the operators.
01012019

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TABLE OF CONTENTS
1.Introduction............................................................. 4
2.Safety Information................................................... 5
2.1. Laws Pertaining to Spark Arrestors...................................... 5
2.2. Operating Safety....................................................... 5
2.3. Operator Safety while using Internal Combustion Engines................ 6
2.4. Service Safety ......................................................... 7
2.5. Decal Locations........................................................ 8
2.6. Safety and Information Labels .......................................... 9
3.Technical Data ....................................................... 12
3.1. Engine......................................................... 12
3.2. Noise and Vibration .................................................. 13
4.Operation............................................................... 14
4.1. Application .......................................................... 14
4.2. New Machine Set-up................................................. 14
4.3. Recommended Fuel.................................................. 14
4.4. Installing Blades ..................................................... 14
4.5. Installing and Adjusting Handles ...................................... 15
4.6. Controls ............................................................. 16
4.7. Engine switch handle................................................. 17

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4.8. Before Starting....................................................... 17
4.9. To Start ............................................................. 17
4.10. To Stop ........................................................... 18
4.11. Engine Control Module ............................................. 18
4.12. Operation.......................................................... 19
4.13. Braking System.................................................... 20
4.14. Pitch Adjustment................................................... 21
5.Maintenance.......................................................... 22
5.1. Periodic Maintenance Schedule....................................... 22
5.2. Engine Oil ........................................................... 22
5.3. Air Cleaner .......................................................... 23
5.4. Spark Plug .......................................................... 23
5.5. Cleaning Sediment Cup .............................................. 24
5.6. Adjusting Idle Speed ................................................. 24
5.7. Carburetor Adjustment ............................................... 25
5.8. Belt Replacement.................................................... 25
5.9. Trowel Lubrication ................................................... 26
5.10. Optional Weights................................................... 27
5.11. Lifting ............................................................. 27

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5.12. Storage................................ 27
5.13. Troubleshooting.................................................... 28
6.Warehouse Locations ............................................ 31
7.Additional Notes.................................................... 31
8.Safety Program ...................................................... 33
9.Parts List Breakdown ..............................Attachment
CALIFORNIA
Proposition 65 Warning:
Engine exhaust, some of its constituents, and certain vehicle components,
contain or emit chemicals known to the State of California to cause cancer
and birth defects or other reproductive harm.
1. Introduction
This manual provides information and procedures to safely operate and maintain the model.
For your own safety and protection from injury, carefully read, understand and observe the
safety instructions described in this manual.
Keep this manual or a copy of it with the machine. If you lose this manual or need an
additional copy, please contact our Corporation. This machine is built with user safety in
mind; however, it can present hazards if improperly operated and serviced. Follow operating
instructions carefully! If you have questions about operating or servicing this equipment,
please contact our Corporation.
The information contained in this manual was based on machines in production at the time
of publication. We will reserve the right to change any portion of this information without
notice.

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2. Safety Information

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READ AND STUDY THE FOLLOWING SAFETY INFORMATION BEFORE
ATTEMPTING TO OPERATE THIS EQUIPMENT. IN ADDITION, ENSURE THAT
EVERY INDIVIDUAL WHO OPERATES OR WORKS WITH THIS EQUIPMENT IS
FAMILIAR WITH THESE SAFETY PRECAUTIONS.
IT IS THE OPERATOR'S RESPONSIBILITY TO OPERATE OUR MACHINES ONLY
WHEN WEARING THE PROPER PROTECTION RECOMMENDED BY THE
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION. HARM OR DEATH BY
INHALING PARTICLES OR OTHER PHYSICAL INJURY MAY OCCUR IF THIS
MACHINE IS OPERATED WITHOUT USING THE PROPER SAFETY GEAR, OR
FOLLOWING THE APPROPRIATE PROCEDURES IN THIS MANUAL.

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This manual contains DANGER, WARNING, CAUTION, and NOTE callouts
which must be followed to reduce the possibility of personal injury, damage to
the equipment, or improper service.
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
DANGER indicates an imminently hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
CAUTION: Used without the safety alert symbol, CAUTION indicates a potentially
hazardous situation which, if not avoided, may result in property damage.
Note: Contains additional information important to a procedure.
2.1 Laws Pertaining to Spark Arrestors
Notice: State Health Safety Codes and Public Resources Codes specify that in certain
locations spark arresters be used on internal combustion engines that use
hydrocarbon fuels. A spark arrester is a device designed to prevent accidental
discharge of sparks or flames from the engine exhaust. Spark arresters are
qualified and rated by the United States Forest Service for this purpose.
In order to comply with local laws regarding spark arresters, consult the engine distributor
or the local Health and Safety Administrator.
2.2 Operating Safety
WARNING: Familiarity and proper training are required for the safe operation
of equipment. Equipment operated improperly or by untrained personnel can
be dangerous. Read the operating instructions contained in both this manual
and the engine manual and familiarize yourself with the location and proper
use of all controls. Inexperienced operators should receive instruction from
someone familiar with the equipment before being allowed to operate the
machine.

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2.2.1 NEVER allow anyone to operate this equipment without proper training. People
operating this equipment must be familiar with the risks and hazards associated
with it.
2.2.2 NEVER touch the engine or muffler while the engine is on or immediately after it
has been turned off. These areas get hot and may cause burns.
2.2.3 NEVER use accessories or attachments thatare not recommendedby us. Damage
to equipment and injury to the user may result.
2.2.4 NEVER leave machine running unattended.
2.2.5 NEVER operate the machine with the belt guard missing. Exposed drive belt and
pulleys create potentially dangerous hazards that can cause serious injuries.
2.2.6 NEVER operate this machine in applications for which it is not intended.
2.2.7 NEVER use the trowel around pop-ups in the concrete that are lower than the
lowest ring on the ring guard.
2.2.8 ALWAYS wear protective clothing appropriate to the job site when operating
equipment.
2.2.9 ALWAYS wear hearing and eye protection when operating this machine.
2.2.10 ALWAYS remain aware of moving parts and keep hands, feet, and loose clothing
away from the moving parts of the equipment.
2.2.11 ALWAYS read, understand, and follow procedures in the Operator’s Manual
before attempting to operate the equipment.
2.2.12 ALWAYS store the equipment properly when it is not being used. Equipment
should be stored in a clean, dry location out of the reach of children.
2.2.13 ALWAYS close fuel valve on engines equipped with one when machine is not being
operated.
2.2.14 ALWAYS operate machine with all safety devices and guards in place and in
working order. DO NOT modify or defeat safety devices. DO NOT operate machine
if any safety devices or guards are missing or inoperative.
2.2.15 ALWAYS be sure operator is familiar with proper safety precautions and operation
techniques before using machine.
2.2.16 ALWAYS test the function of the engine control module before operating the
trowel.
DO NOT operate the trowel if the engine control module is not functioning
properly.
2.3 Operator Safety while using Internal Combustion Engines
DANGER: Internal combustion engines present special hazards during
operation and fueling. Read and follow the warning instructions in the engine.

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2.3.1 DO NOT run the machine indoors or in an enclosed area such as a deep trench
unless adequate ventilation, through such items as exhaust fans or hoses, is
provided. Exhaust gas from the engine contains poisonous carbon monoxide gas;
exposure to carbon monoxide can cause loss of consciousness and may lead to
death.
2.3.2 DO NOT smoke while operating the machine.
2.3.3 DO NOT smoke when refueling the engine.
2.3.4 DO NOT refuel a hot or running engine.
2.3.5 DO NOT refuel the engine near an open flame.
2.3.6 DO NOT spill fuel when refueling the engine.
2.3.7 DO NOT run the engine near open flames.
2.3.8 ALWAYS refill the fuel tank in a well-ventilated area.
2.3.9 ALWAYS replace the fuel tank cap after refueling.
2.4 Service Safety
WARNING: Poorly maintained equipment can become a safety hazard! In
order for the equipment to operate safely and properly over a long period of
time, periodic maintenance and occasional repairs are necessary.
2.4.1 DO NOT attempt to clean or service the machine while it is running. Rotating parts
can cause severe injury.
2.4.2 DO NOT crank a flooded engine with the spark plug removedon gasoline-powered
engines. Fuel trapped in the cylinder will squirt out the spark plug opening.
2.4.3 DO NOT test for spark on gasoline-powered engines if the engine is flooded or the
smell of gasoline is present. A stray spark could ignite the fumes.
2.4.4 DO NOT use gasoline or other types of fuels or flammable solvents to clean parts,
especially in enclosed areas. Fumes from fuels and solvents can become
explosive.
2.4.5 DO NOT remove blades while the machine is hanging overhead.
2.4.6 ALWAYS support the machine securely before changing blades.
2.4.7 ALWAYS keep the area around the muffler free of debris such as leaves, paper,
cartons, etc. A hot muffler could ignite the debris and start a fire.
2.4.8 ALWAYS replace worn or damaged components with spare parts designed and
recommended by our Corporation.
2.4.9 ALWAYS disconnect the spark plug on machines equipped with gasoline engines,
before servicing, to avoid accidental start-up.

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2.4.10 ALWAYS keep the machine clean and labels legible. Replace all missing and
hard-to-read labels. Labels provide important operating instructions and warn of
dangers and hazards.
2.4.11 ALWAYS handle blades carefully. The blades can develop sharp edgeswhich can
cause serious cuts.
2.5 Decal Locations

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2.6 Safety and Information Labels
These machines use international pictorial labels where needed. These labels are described
below:
Label
Meaning
DANGER! Engines emit carbon monoxide;
operate only in well-ventilated area. Read the
Operator’s Manual. No sparks, flames, or
burning objects near the machine. Shut off
the engine before refueling.
WARNING! Hot surface!
WARNING! Hand injury if caught in moving
belt. Always replace belt guard.
WARNING! Always wear hearing and eye
protection when operating this machine.
WARNING! Cutting hazard. Always replace
blade guard!

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Label
Meaning
WARNING
Remove pan from trowel before lifting
machine overhead. Pans can fall and
cause death or serious injury if a
person is hit. (Located on top side of
float pan.)
Variable speed throttle
CAUTION
Read and understand the supplied
Operator’s Manuals before operating
this machine. Failure to do so
increases the risk of injury to
your-self or others.
Engine switch handle:
Press to stop engine

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Label
Meaning
Open the fuel flow valve.
Turn engine switch to “ON” position.
Place throttle on IDLE position.
Open the choke.
Close the choke
Turn engine key switch to “NO” position
Pull the rewind starter

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Turn engine switch to “OFF” position.
Close the fuel flow valve
3. Technical Data
3.1 Engine
Item No.
PDMG1000
Engine Model
168F
Rated Power
kW (Hp)
4.8(6.5) @ 3600rpm
Spark Plug
NGK BPR 6ES, F7RTC
Electrode Gap
mm (in.)
0.7 –0.8 (0.028 –0.031)
Engine Speed - full load
rpm
3800 ± 100
Engine Speed - idle
rpm
1450 ± 100
Clutch engagement
rpm
1800
Valve Clearance (cold)
mm (in.)
0.15 (0.006) 0.20 (0.008)
intake: exhaust:
Turn engine key switch to “OFF” position.

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Air Cleaner
type
Dual element
Engine Lubrication
oil grade
SAE 10W30 SG or SF
Engine Oil Capacity
L (oz.)
0.6 (20)
Fuel
type
Regular unleaded gasoline
Fuel Tank Capacity
L (qts.)
3.6 (3.8)
Fuel Consumption
L (qts.) /hr
1.8 (1.9)
Running time
hr.
2
Trowel Diameter
mm (in.)
960（38）
Trowel Rotor
rpm
60-140
Gear Box Lubrication
L (oz.)
0.62 (21)
Pitch Range degrees
0-15°
Dimensions
mm (in)
1040X1040X620(41X41X24.4)
Weight
kg (lbs.)
98/(215)
3.2 Sound and Vibration Data
●The sound pressure level at operator’s location (LpA): 103 dB(A)
●The guaranteed sound power level (LWA) = 89dB(A)
These sound values were determined according to ISO 3744 for the sound power level
(LWA) and ISO 6081 for the sound pressure level (LpA) at the operator’s location.
The weighted effective acceleration value, determined according to ISO 8662 Part 1, is:
5.3 m/s2.

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●The sound and vibration specifications were obtained with
the unit operating on cured concrete at full engine speed.
4. Operation
4.1 Application
This trowel is a modern, high production machine intended for floating and finishing freshly
poured concrete slabs. The machine's good balance, adjustable handle, and easily reached
controls add to operator comfort and productivity. An automatic stop sensor provides added
operator safety. Finishing rates will depend on operator skill and job conditions.
DO NOT use this machine for any application other than troweling concrete.
4.2 New Machine Set-up
Trowels are shipped from the factory with the handle removed. Follow instructions on
Installing Blades and Installing and Adjusting Handles when setting up new machines or
when installing new handles and blades.
4.3 Recommended Fuel
The engine requires regular grade unleaded gasoline. Use only fresh, clean gasoline.
Gasoline containing water or dirt will damage fuel system. Consult engine owner’s manual
for complete fuel specifications.
4.4 Installing Blades
See Graphic 2
There are four types of blades available for the trowels. Float pans are large "pizza pan" style
blades, which hook on over finish or combination blades and are available for the 36"
machines only. Float blades are available for all machines and clip on over finish or
combination blades. Both are used in the earliest stages of work, and are not pitched.
Finish blades are used in the final stages of working, and are progressively pitched to burnish
the concrete.
Combination blades can be used throughout the concrete working process. They are used in
place of float blades or pans and finish blades.
Note: Trowel blades must NOT be interchanged, i.e., do NOT put larger diameter blades
on a smaller diameter trowel.
4.4.1 Finish blades are flat on both edges and can be installed in either direction.
When installing combination blades, orient blades as shown (a). This position the raised
edges of the blade correctly for the clockwise rotation of the machine.
4.4.2 Secure blades to trowel arms with screws (b). Dip threads of screws in grease prior
to installation. This will prevent concrete from cementing the screws in place and
will make removal of the blades easier later on.
4.4.3 Plug the remaining threaded holes in theblade brace with plastic plugs (c) to prevent
them from filling with concrete.

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WARNING: Do not lift the trowel overhead with a float pan
attached, as the pan could fall off and strike personnel working
in the vicinity.
Graphic 2
4.5 Installing and Adjusting Handles
See Graphic 3,4
On new machines the pipe handle comes assembled with the pitch control (Twist or Pro-
Shift®) (c), engine switch handle (b), throttle (a), screws (g), and nut (m).
To install the pipe handle assembly:
4.5.1 On machines with an adjustable handle, position the handle by loosening the knob
(d) and adjusting the handle up or down to suit the operator. Tighten the knob to
secure the handle in position.
4.5.2 Pull the pitch control cable (j) from bottom end of the tube and remove the nut from
the cable.
4.5.3 Thread the cable through the handle base (f) and over the pulley (h) as shown.
4.5.4 Attach the pipe handle to the handle base with two M8x65 screws (g). Torque the
screws to 25 Nm (18 ft·lbs.).
4.5.5 Push the handle all the way forward (away from the operator) OR turn the twist pitch
control handle counterclockwise as far as possible. Connect the cable to the fork
(k) as shown andadjust the cable nut (m) so the cable is snug and the trowel blades
lay flat (0° pitch).
4.5.6 Move throttle (a1) to idle position. Remove air cleaner cover. Feed cable through
clamp on recoil cover. Connect throttle cable to engine throttle bracket by placing
z-bend through hole in throttle plate. Clamp cable into throttle casing bracket and
replace air cleaner cover.
4.5.7 Connect electrical wire on handle to both ends of the engine wire. See handle
instruction sheet for additional detail on installation.
Note: On machines with the engines, do not connect wires in bag to wires in handle.

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Graphic 3
Graphic 4

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4.6 Controls
See Graphic 3
Ref.
Description
Ref.
Description
A
Throttle
D
Handle height
adjustment (if
equipped)
B
Engine switch
handle
C
Twist pitch control
or pitch control
4.7 Engine Switch Handle
See Graphic 3
When the engine switch handle (b) is pressed, the engine will shut off.
To prevent uncontrolled spinning of the trowel, the engine control module is designed to
shutoff the engine under certain conditions. For example, if the operator loses his/her grip on
the trowel, the engine control module will sense that the machine is spinning and shut off the
engine. The momentum of the spinning trowel will engage the brake and stop the handle from
spinning past 270°.
4.8 Before Starting
Before starting trowel, check the following:
●oil level in engine
●oil level in gearbox
●fuel level
●condition of air filter
●condition of fuel lines
●condition of trowel arms and blades
●condition of ring guard
●label descriptions
●handle height to suit operator
4.9 To Start
See Graphic 3, 5
4.9.1 Open fuel valve by moving lever to the right (g1).
Note: If engine is cold, move choke lever to closed position (i1). If engine is hot, set choke
to open position (i2).
4.9.2 Turn engine switch to “ON” (h1).
4.9.3 Move the throttle lever to the idle position (a1).

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Note: Start engine with throttle in the idle position. If the engine is started when the throttle
is not in the idle position, the engine should not start. This is a feature of the engine
control module that prevents wide open throttle startup.
4.9.4 Pull starter rope (j).
WARNING: Do not place foot on the ring guard when starting the engine, as
severe injury can occur if foot slips through the ring guard as the blades start to
spin.
Note: If the engine oil is low, the engine will not start. If engine does not start, check the
oil level and add oil as needed.
4.9.5 Open choke as engine warms (i2).
4.9.6 Open throttle (a2) to operate trowel. Adjust blade RPM with throttle speed to suit
conditions.
Graphic 5
4.10 To Stop
See Graphic 3, 5
4.10.1 Reduce engine RPM to idle by moving the throttle lever to idle position (a1).
4.10.2 Push the engine switch handle (b).
4.10.3 Turn engine switch to “OFF” (h2).
4.10.4 Close fuel valve by moving lever to the left (g2).
4.11 Engine Control Module
To test the engine control module, start the machine and jerk the handle to the right. The engine
should stop. If the engine does not stop, repeat the jerking motion until the engine stops. If the
engine does not shut off, push the engine switch handle and turn the engine off. DO NOT
operate the machine until the engine control module is replaced.