Table of Contents
Advertisement
TROUBLE SHOOTING (TROWEL)
SYMPTOM
Engine running rough or not at
all.
Safety switch not functioning.
If trowel "bounces, rolls
concrete, or makes uneven
swirls in concrete".
Machine has a perceptible
rolling motion while running.
Clutch slipping or sluggish
response to engine speed
change.
POSSIBLE PROBLEM
Safety switch malfunction?
Fuel?
Ignition?
Bad contacts?
Loose wire connections?
Other problems?
Blades?
Spider?
Bent trowel arms?
Trowel arm bushings?
Thrust collar?
Thrust collar bushing?
Thrust bearing worn?
Main shaft?
Yoke?
Blade Pitch?
Worn V-belts?
Dirty centrifugal clutch?
Defective or worn out
centrifugal clutch?
Worn bearings in gearbox?
Worn or broken gears in
gearbox?
SOLUTION
Make sure that the safety switch is ON or replace
switch if necessary.
Look at the fuel system. Make sure there is fuel being
supplied to the engine. Check to ensure that the fuel
filter is not clogged.
Check to ensure that the ignition switch has power and
is functioning correctly.
Replace switch.
Check wiring. Replace as necessary.
Consult engine manufacturer's manual.
Make certain blades are in good condition, not
excessively worn. Finish blades should measure no
less than 2" (50mm) from the blade bar to the trailing
edge, combination blades should measure no less that
3.5" (89mm).
Check that all blades are set at the same pitch angle
as measured at the spider.
Check the spider assembly for bent trowel arms. If one
of the arms is even slightly bent, replace it
immediately.
Check the trowel arm bushings for tightness. This can
be done by moving the trowel arms up and down. If
there is more than 1/8" (3.2mm) of travel at the tip of
the arm, the bushings should be replaced. All
bushings should be replaced at the same time.
Check the flatness of the thrust collar by rotating it on
the spider. If it varies by more than 0.02" (0.5mm)
replace the thrust collar.
Check the thrust collar by rocking it on the spider. If it
can tilt more than 3/32" (2.4mm) [as measured at the
thrust collar O.D.], replace the bushing in the thrust
collar.
Check the thrust bearing to see that it is spinning free.
Note: Thrust cap, replace if necessary.
The main output shaft of the gearbox assembly should
be checked for straightness. The main shaft must run
straight and cannot be more than 0.003" (0.08mm) out
of round at the spider attachment point.
Check to make sure that both fingers of the yoke press
evenly on the wear cap. Replace yoke as necessary.
Check to ensure that each blade is adjusted to have
the same pitch as all other blades. Adjust per
maintenance section in manual.
Replace V-belt.
Disassemble and clean clutch.
Replace entire clutch.
Rotate input shaft by hand. If shaft rotates with
difficulty, check the input and output shaft bearings.
Replace as necessary.
Verify that the gearbox shaft rotates when the input
shaft is rotated. Replace both the worm and worm
gear as a set.
9
Advertisement
Table of Contents
