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Symptom
Engine running rough or not at all.
Trowel bounces, rolls concrete, or makes
uneven swirls in concrete.
PAGE 40 — CA5BM WALK-BEHIND TROWEL • OPERATION MANUAL — REV. #1 (05/18/22)
TROUBLESHOOTING (TROWEL)
Troubleshooting (Walk-Behind Trowel)
Possible Problem
Engine ON/OFF switch in OFF position
or malfunctioning?
Centrifugal ON/OFF switch in OFF
position or malfunctioning?
Fuel?
Ignition?
Loose wire connections
Bad contacts in ON/OFF switch?
Blades?
Pitch adjustment?
Bent trowel arms?
Spider?
Thrust collar?
Thrust collar bushing?
Thrust bearing worn?
Solution
Make sure that the Engine ON/OFF switch is ON
or replace switch if necessary.
Place centrifugal stop switch in ON position.
Check wiring. Replace switch if necessary.
Check the fuel system. Make sure there is fuel
being supplied to the engine. Check to ensure that
the fuel fi lter is not clogged.
Check to ensure that the ignition switch has power
and is functioning correctly.
Check wiring. Replace or repair as necessary.
Replace ON/OFF switch.
Make certain blades are in good condition, not
excessively worn. Finish blades should measure
no less than 2" (50 mm) from the blade bar to the
trailing edge. Combo blades should measure no
less than 3.5" (89 mm). Trailing edge of the blade
should be straight and parallel to the blade bar.
Check that all blades are set at the same
pitch angle as measured at the spider. A fi eld
adjustment tool is available for height adjustment
of the trowel arms. (Contact Parts Dept.)
Check the spider assembly for bent trowel arms.
If one of the arms is even slightly bent, replace it
immediately.
Check fi t of arms in spider. This can be done by
moving the trowel arms up and down. If there is
more than 1/8 inch (3.2 mm) of travel at the tip of
the arm, the spider and arms should be replaced.
Check the fl atness of the thrust collar by rotating
it on the spider. If it varies by more than 0.02 inch
(0.5 mm) replace the thrust collar.
Check the thrust collar by rocking it on the spider.
If it can tilt more than 3/32 inch (2.4 mm) as
measured at the thrust collar O.D., replace the
thrust collar.
Check the thrust bearing to see that it is spinning
freely. Replace if necessary.
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