TROUBLESHOOTING 777 SERVICE MANUAL
10-26 Published 10-01-2012, Control # 045-08
CHECKS
Check for damage to pawl or pawl linkage. Check for pawl
or pawl actuator/cylinder for freedom of movement.
Problem 24
A load drum pawl is not operating correctly.
POSSIBLE CAUSES
Mechanical hang-up; No hydraulic pressure; No voltage to front or rear drum motor;
No voltage to auxiliary drum pawl solenoid; Cylinder failure; Motor failure.
No Damage
Damage
Repair damage.
Test and adjust.
Check and replace pawl fuse F6 (wire 8S) if open. Check pawl switch wiring.
Move load drum pawl selector switches and verify pawl
solenoid is enabled. One solenoid valve is always enabled.
Check auxiliary drum hydraulic cylinder for pressure at cylinder ports.
Voltage
No Voltage
Pressure
No Pressure
Check hydraulic circuit components.
Replace items as required.
Repair or replace cylinder.
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