Allied H12E, Service Manual

Page: 62 / 121

Section 2
2 - 3
Figure 2-1 Mechanical/Hydraulic Troubleshooting Chart - 3
PROBLEM POSSIBLE CAUSE CORRECTION ACTION
Winch Operates But Exhibits The Following Problems
Operation is rough. Low oil level. Add oil; refer to tractor oil
specifi cations.
Low pilot pressure. Refer to tractor pilot system
troubleshooting.
Wire rope jumps layers on drum. Spool wire rope more evenly.
Operation is noisy. Air in the hydraulic oil (indicated by
foaming or milky-colored oil). Inspect for leaks and other sources
of air induction.
Motor damaged. Some noise is normal. However,
excessive clattering could indicate
damage. Inspect pump and motor
thoroughly.
Gear or bearing damage. Visually inspect and repair as
needed.
Drum continues to rotate after lever
is returned to
BRAKE-ON .
Counterbalance valve stuck open. Repair or replace valve.
Brake not engaged or worn. Repair brake.
Oil level too high in gear-side cavity. Too much oil added. Drain excessive oil. Check level to
“LEVEL” plug on winch case.
Oil leaking from hydraulic supply into
gear-side cavity. Locate leak.
Repair or replace faulty component.
No HI-SPEED mode (Option Code
D)
(X1 pressure not present at test port)
HI-SPEED switch malfunction. Replace switch.
Wire harness. Check connections and continuity
or wire damage - repair or replace
harness.
Solenoid malfunction. Check solenoid coil resistance
and replace if measurement is not
between 46-51 Ohms.
Improper hose connection. Inspect hydraulic lines and condition.
Motor servo problem. Contact Allied Service Department.
Winch stalls during operation. Incorrect PCOR setting on hydraulic
motor. Check PCOR and dozer supply
pressures (see Section 3). If either
is incorrect, contact Allied Service
Department.
Insuffi cient hydraulic pressure
supplied by dozer.