Allied H6G, Service Manual

Page: 38 / 112

Troubleshooting
2 - 4
PROBLEM POSSIBLE CAUSE CORRECTION
Winch gets very hot Low oil level. Add oil (MIL-PRF-2105E); refer to tractor oil
specifi cations.
Improper oil viscosity. Use correct oil grade (MIL-PRF-2105E); refer
to tractor oil specifi cations.
Winch coated with dirt. Clean winch.
Clogged fi lter or strainer. Replace tractor fi lter.
Clogged cooler. Clean cooler.
Operation is rough Low oil level. Add oil (MIL-PRF-2105E); refer to tractor oil
specifi cations.
Low pilot pressure. Normal pressure is above 260 psi. Look for
leaks in hydraulic system. If none are found,
see Pilot Supply Reducing Valve Adjustment.
Wire rope jumps layers on drum. Spool wire rope more evenly.
Motor hunting between high and low
speed. 2-speed solenoid is malfunctioning, motor
speed spool sticking, shuttle valve not select-
ing priority pilot signal to 2-speed, pressure
switch or relay malfunctioning.
Operation is noisy ( NOTE: mo-
tor is signifi cantly noisier in
HI-SPEED mode
)
Incorrect oil used. Drain reservoir and re-fill with correct oil
(MIL-PRF-2105E); refer to tractor oil specifi -
cations.
Air in the hydraulic oil (indicated by
foaming or milky-colored oil). Replace oil (MIL-PRF-2105E) and 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 & repair as needed.
Drum continues to rotate after
control lever is returned to
BRAKE-ON
Direction spool not shifting to cen-
tered position. Direction spool sticking. Clean or replace.
Control lever assembly valve plunger sticking.
Repair.
Brake not engaged or worn. Repair brake.
Counterbalance valve stuck open. Repair or replace valve.
Winch will not generate suf-
ficient line pull or does not
LINE-IN or LINE-OUT
(Continued on next page)
Worn or damaged components in the
gear train. Visually Inspect to identify damaged compo-
nents. Repair and replace as necessary.
Brake not releasing due to insuffi -
cient brake release pressure or leak
in brake. Check that brake release pilot pressure is
more than 200 psi in
LINE-IN and LINE-OUT
functions. If pilot pressure is too low, check
for leaks, faulty control lever, or insuffi cient
pilot supply pressure. See Step By Step Pump
and Controller Troubleshooting section in this
chapter. If brake is leaking, repair as needed.
Brake shuttle valve stuck. Clean or replace as necessary.
Leak in hydraulic system other than
brake assembly. Plug brake line and check that pressure at
motor ports A & B are 3500 psi.
Figure 2-2 Troubleshooting Chart -1