TM 9-2350-256-34-2
Table 2-3. Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
MAIN WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM)-Continued
2.
MAIN WINCH PAYS IN BUT WILL NOT PAY OUT
Step 1.
Remove main winch brake cover. Refer to TM 9-2350-256-34-1, Medium Recovery Vehicle, M88A1,
anti check if main winch brake is releasing.
Adjust brake. Refer to TM 9-2350-256-20, Medium Recovery Vehicle, M8A1.
Step 2.
Remove hydraulic brake cylinder hose no. 29 and inspect for restriction.
Replace restricted or damaged hose. Refer to TM 9-2350-256-20, Medium Recovery Vehicle, M88SA1.
Step 3.
Remove main winch brake cylinder and test for malfunction. Refer to TM 9-2350-256-34-1, Medium
Recovery Vehicle, M88A1.
Replace main winch brake cylinder.
3.
MAIN WINCH PAYS OUT BUT WILL NOT PAY IN
Step 1.
Inspect for restricted pilot hose between main winch control valve and combination control valve. Refer
to fig. FO-3 and trace pilot circuit.
Replace restricted or damaged pilot hose. Refer to TM 9-2350-256-20, Medium Recovery Vehicle, M88A1.
Step 2.
Broken free-wheeling ratchet bracket assemble unit in main winch.
a.
Remove main winch and spade assembly. Refer to TM 9-2350-256-34-1, Medium Recovery
Vehicle, MS8A1.
b.
Replace main winch. Refer to paragraph 3-6.
4.
MAIN WINCH CREEPS IN EITHER DIRECTION WHEN IN HOLD POSITION
Step 1.
Inspect for restricted pilot hose or main control valve. Refer to figs. FO-2 and FO-3 and trace hose and
valve for restriction.
a.
Replace any restricted pilot hose. Refer to TM 9-2350-256-20, Medium Recovery Vehicle. MS8A1.
b.
Remove restriction or replace control valve. Refer to TM 9-2350-256-34-1, Medium Recovery
Vehicle M88A
NOTE
In cold weather, oil viscosity increases, causing a retarded flow of oil and
possibly causing main winch to creep. Proper warmup will correct.
5.
MAIN WINCH WILL NOT HOLD LOAD
Step 1.
Inspect main winch brake for proper adjustment.
Adjust main winch brake. Refer to TM 9-2350-256-20), Medium Recovery Vehicle, 1MtSA1.
Step 2.
Remove main winch brake cover and inspect for worn brake lining. Refer to TM 9-2350-256-34-1,
Medium Recover Vehicle. M88A1.
6. INSUFFICIENT MAIN SYSTEM OIL PRESSURE
Step 1.
Test mechanical transmission clutch pressure. Install pressure gage in mechanical transmission clutch
pressure hose. For location, refer to TM 9-2350-256-20, Medium Recovery Vehicle, MI88A1. With
engine operating at 1800 rpm, and power control valve lever in ON position, normal operating pressure is
150-10 psi.
a.
Remove mechanical transmission anti main hydraulic pump assembly. Refer to TM 9-2350-256-
34-1, Medium Recover Vehicle, M88AI.
b.
Replace mechanical transmission. Refer to paragraph 3.16.
Change 5 2-7
