PAGE 42 — JTNSW20-24HTCSL SERIES RIDE-ON TROWEL • OPERATION MANUAL — REV. #1 (3/24/16)
TROUBLESHOOTING
Troubleshooting (Ride-On Mechanical Trowel)
Symptom
Possible Problem
Solution
Engine running rough or not at all.
Stop switch malfunction?
Make sure that the stop switch is functioning when the
operator is seated. Replace switch if necessary.
Fuel?
Look at the fuel system. Make sure there is fuel being
supplied to the engine. Check to ensure that the fuel
fi lter is not clogged.
Ignition?
Check to ensure that the ignition switch has power and
is functioning correctly.
Safety stop switch not functioning.
Bad contacts?
Replace switch.
Loose wire connections?
Check wiring. Replace as necessary.
Other problems?
Consult engine manufacturer’s manual.
Trowel bounces, rolls concrete, or makes uneven
swirls in concrete.
Blades?
Make sure blades are in good condition, not excessively
worn. Finish blades should measure no less than 2
inches (50mm) from the blade bar to the trailing edge,
combo blades should measure no less that 3.5 inches
(89mm). Trailing edge of blade should be straight and
parallel to the blade bar.
Pitch Adjustment?
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 Department).
Bent trowel arms?
Check the spider assembly for bent trowel arms. If one
of the arms is even slightly bent, replace it immediately.
Trowel arm bushings?
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 inch (3.2 mm) of travel at the
tip of the arm, the bushings should be replaced. All
bushings should be replaced at the same time.
Thrust collar?
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.
Thrust collar bushing?
Check the thrust collar by rocking it on the spider. If it
can tilt more than 1/16 inch (1.6 mm) - as measured at
the thrust collar O.D., replace the bushing in the thrust
collar.
Thrust bearing worn?
Check the thrust bearing to see that it is spinning freely.
Replace if necessary.
Machine has a perceptible rolling motion while
running.
Main shaft?
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 inch (0.08 mm)
out of round at the spider attachment point.
Yoke?
Check to make sure that both fi ngers of the yoke press
evenly on the wear cap. Replace yoke as necessary.
Blade Pitch?
Check to ensure that each blade is adjusted to have the
same pitch as all other blades. Adjust per maintenance
section in manual.
