Stone the commutator, clean or replace brushes;
replace traction motor if necessary.
Bad traction motor (open winding).
Replace traction amplifier.
Bad traction amplifier.
Test diode and replace if necessary.
Diode failure.
Check cables, repair or replace.
Broken or loose A1 or A2 cable from traction
amplifier to traction motor.
Replace fuse.
Open armature fuse (400 Amp).
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 system controller detects no current to the
traction motor armature when there should be.
TRACTION system shutdown. Will not pass
POST.
Criteria
Resulting Effect
LEFT/RIGHT TRACTION MOTOR ARMATURE CURRENT NOT PRESENT
Fault condition
E65L
E65L
E65R
E65R
Replace system controller field fix.
Damaged or defective system controller.
Test battery under load and replace if necessary.
Battery voltage too low, especially if error occurs
while operating truck.
Solution
Possible Cause
The internal 5V power supply is out of range.
TOTAL shutdown.
Criteria
Resulting Effect
SYSTEM C5 VOLTAGE OUT OF RANGE
Fault condition
E69
E69
Replace system controller field fix.
Bad system controller.
Disconnect amplifier harnesses one at a time until
fault changes. (Turn truck off while unplugging
harnesses)
Bad amplifier.
Locate and eliminate any shorts to chassis.
Electrical shorts to chassis.
Test battery under load and replace if necessary.
Battery voltage too low, especially if error occurs
while operating truck.
Solution
Possible Cause
The internal 15V power supply is out of range.
TOTAL shutdown.
Criteria
Resulting Effect
SYSTEM C15 VOLTAGE OUT OF RANGE
Fault condition
E70
E70
E
lectric
C
ounterbalance
H
igh
O
utput
Troubleshooting
REV 12/5/99
TS.14
