Chapter 12 – Troubleshooting
TM12 – 8210027 41
Possible Cause
Prolonged driving or platform opera-
tion.
High pressure fluid return to reservoir
caused by kinked or twisted hose.
Hydraulic system component fail-
ure.
Failure of hose, tube, fitting, seal,
etc.
Corrective Action
Stop operation until fluid cools.
Remove the kink or twist from the
hose. Let fluid cool before resuming
operation.
Stow the machine and do not operate
until repairs are made.
Stow the machine and do not operate
until repairs are made.
Symptom
Hydraulic fluid temperature of
160°F (71°C) or more.
Severe hydraulic leak.
Possible Cause
Upper or lower control function de-
pressed during machine start up.
Faulty lower or upper control panel or
machine error.
Machine error.
Corrective Action
From the upper controls make sure:
no selector buttons are de-
pressed.
the interlock switch is not de-
pressed.
the joystick is in neutral.
the steer switch is not depressed.
From the lower or upper controls:
cycle machine power off then on
by pressing the emergency stop
button and then twisting the but-
ton clockwise to restore power.
Stow the machine and do not operate
until repairs are made.
Stow the machine and do not operate
until repairs are made.
•
•
•
•
•
Fault Code
01 - 39
54 - 68
When a fault code is displayed on the upper control panel,
the chart below may be used to locate and eliminate situ-
ations where machine operation may be interrupted.
If the problem cannot be corrected with the action listed,
stow the machine and remove it from service. Repairs
must be made by qualified maintenance personnel.
Property of American Airlines
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