Chapter 11 – Troubleshooting
64 A46JRT – 0260996
Symptom
Upper controls do
not work.
Boom and drive functions seem
sluggish.
Turntable and main boom func-
tions do not work from the upper
controls.
Main boom will not raise or extend.
Riser and/or main boom drifts
down.
Drive functions do not work.
Can not reach maximum drive
speed of 4.5 mph (7.2 km/h).
Wheels will not turn when
winching.
Tilt alarm does not work.
Possible Cause
Controls selector switch at lower con-
trols is in the lower control position.
Platform foot switch not engaged.
Foot switch held down for too long
without operating a function. A func-
tion must be operated within 10 sec-
onds of activating the foot switch, or
no functions will operate.
Hydraulic oil is cold and thick.
Boom speed knob set too slow.
Boom switch error. Faulty switch.
Hydraulic system malfunction.
Load capacity exceeded.
Machine on too steep a grade.
Drive hubs are disengaged.
Low hydraulic system pressure.
Booms are not retracted and lowered.
Drive range switch is in low (turtle).
Low engine rpm.
Drive hubs are engaged.
Booms are stowed.
Corrective Action
Place switch in the upper controls
position.
Step down on platform foot switch
while operating controls.
Release the foot switch. Operate
machine function within 10 seconds
of operating the foot switch.
Use cold weather hydraulic oil as
recommended for weather condi-
tions. Warm oil before operating the
machine.
Turn knob toward fast.
Stow the machine and do not operate
until repairs are made.
Stow the machine and do not operate
until repairs are made.
Remove load from platform. Refer to
platform capacity placard for maxi-
mum capacity.
Lower the booms and drive to a level
surface.
Turn drive wheel disconnect plates
around so nipples point outward.
Stow the machine and do not operate
until repairs are made.
Fully retract and lower the booms.
Place the switch in the high (rabbit)
position.
Stow the machine and do not operate
until repairs are made.
Turn drive wheel disconnect plates
around so nipples point inward.
Normal operation. The tilt alarm is
not operational when the booms are
stowed.
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