Allied H6G, Service Manual

Page: 37 / 112

Section 2
2 - 3
1.14 Operate control lever in both directions. Is pressure at RI & RO greater
than the standby pilot pressure of 275±15 psi?
No Verify that pilot pressure to direc-
tional spool PA & PB will cause
the pump to load sense & cause
pilot pressure to increase. Return
to step 1.12.
Yes Proceed to step 1.15.
1.15 Install gauges at motor ports A & B using 0-5000 psi gauges. Discon-
nect the brake line and move the control lever in LINE-IN and LINE-
OUT . If pressure is below 3500 psi, is it possible to adjust the load
sense relief valve? (Refer to Section 3 for more details on pressure
check procedures.)
No Replace load sense high pressure
relief valve cartridge and return to
step 1.12.
Yes Adjust load sense high pressure
relief valve to 3500 psi. Proceed
to step 1.16.
1.16 Re-connect the brake line and put control lever in LINE-IN and LINE-
OUT positions. Does winch operate?
No Check for mechanical faults in the
drive beyond the motor shaft.
Yes Operate the winch.
2. Winch is sluggish or erratic
2.1 Is the control lever assembly in good condition? Is there air in pilot
lines?
No Repair or replace the control lever
assembly. If there is air in the pilot
lines, bleed them.
Yes Proceed to step 2.2.
2.2 Is the brake fully released? No Check brake release circuit or
mechanism. See shuttle valve
in logic control manifold & brake
valve.
Yes Operate the winch.
3. Winch drives in one direction only.
3.1 With the control lines switched does the winch drive in opposite direc-
tion only?
No Proceed to step 3.2.
Yes Control signal from one side of
control lever assembly does not
work properly. Repair as neces-
sary.
3.2 With control lines still switched does winch drive in initial direction only? No Proceed to step 3.3.
Yes Problem is one side of winch direc-
tion spool. Proceed to step 3.3.
3.3 Is there control pressure to PA & PB as well as from from RI & RO?
Winch begins to drive when the pressure at RI or RO is 150 psi.
No Correct control signal problem.
Yes Operate the winch.