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MicroController Control System Troubleshooting
PROBLEM 19
Overtemperature is ON and Display = and EC or Ec.
Lift truck accelerates slower than normal or lifting speed
is slower than normal. Power steering operation normal.
POSSIBLE CAUSE
Control panel overheated; Control thermostat (thermal
senders) defect; Logics defect.
CHECKS
Let the truck cool for 15 minutes.
(EC = Drive controller, Ec = Pump controller)
Overtemperature indicator ON Normal display
Check the cooling fan for
controller after key on
Fail Normal
Replace the fan.
Control panel was overheated, resume normal
operation. If repeats occur, check
drive and pump motors current draw or
operating cycle for excessive ramp
climbing, towing or excessive lifting.
Replace drive (EC) or
pump (Ec) controller.
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