Replace system controller field fix.
Malfunction of the coil driver.
Replace contactor.
Contactor coil is open or shorted internally.
Check 15 amp fuse on main harness, wiring on all
hydraulic valve coils, repair or replace. Check for
B+ at J4 Pin 3.
If error codes 29-42 occur at the same time; 15
Amp fuse in main harness is bad.
Check and repair damaged wires to the coil.
Broken or shorted wiring to the coil.
PERFORM OUTPUT TEST 19 - LIFT MOTOR.
Solution
Possible Cause
The lift contactor coil circuit is overheated, shorted
to supply, shorted to ground, or disconnected.
LIFT system, except lower shutdown.
Criteria
Resulting Effect
LIFT CONTACTOR WIRING FAULT
Fault condition
E42
E42
Replace traction amplifier.
Bad traction amplifier.
Replace traction motor.
Bad traction motor (field resistance greater than
0.9 ohm at room temp).
Check motor terminals, brake clearance, operation
of drive unit and wheel.
Loose motor terminals, brake drag, mechanical
binding of drive unit or wheel.
Change style of operation.
Continuous low speed travel operation, short
runs, hard acceleration / plugging.
Calibrate steer position potentiometer.
Steer not properly calibrated.
PERFORM OUTPUT TEST 17 or 18 - TRACTION MOTOR FIELD & ARMATURE CURRENT. Should
see Field amps 25-36 and armature amps 40-70 with truck jacked up. Test both forward and reverse.
Left and right field current should not differ by more than 5 amps.
Solution
Possible Cause
The temperature of the traction motor (based on
field resistance) has reached a point at which
damage may occur.
TRACTION system shutdown.
Criteria
Resulting Effect
LEFT/RIGHT TRACTION MOTOR OVERHEATED
Fault condition
E51L
E51L
E51R
E51R
E
lectric
C
ounterbalance
H
igh
O
utput
Troubleshooting
REV 12/5/99
TS.11
