TM-9-2350-256-34

RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 2005
TM-9-2350-256-34

  TM-9-2350-256-34 - Page 85 of 584

TM 9-2350-256-34
0008 00
CORRECTIVE ACTION –Continued
27.
Inspect for restricted pilot hose or main control valve (refer to FO-2 and FO-3 and trace hose and valve
for restriction).
a.
Replace any restricted pilot hose (TM 9-2350-256-20).
b.
Remove restriction or replace control valve (WP 0051 00).
NOTE
In cold weather, oil viscosity increases, causing a retarded flow of oil and possibly causing main winch
to creep. Proper warmup will correct.
28.
Inspect main winch brake for proper adjustment.
a.
Adjust main winch brake (WP 0057 00).
29.
Remove main winch brake cover and inspect for worn brake lining (WP 0057 00).
30.
Test mechanical transmission clutch pressure. Install pressure gage in mechanical transmission clutch
pressure hose. For location, refer to TM 9-2350-256-20. With engine operating at 1800 rpm, and power
control valve lever in ON position, normal operating pressure is 150 ± 10 psi (1034 ± 69 kPa).
a.
Remove mechanical transmission and main hydraulic pump assembly (WP 0065 00).
b.
Replace mechanical transmission (WP 0065 00).
WARNING
Test components must be capable of withstanding a working pressure of 1950–2050 psi (13,445–14,135
kPa) (step 31 only).
NOTE
After performing main hydraulic pump test, return all plumbing to original configuration.
31.
Test main hydraulic pump. Remove check valve and tee between hose no. 4A and hose no. 4B. Install
main hydraulic pump tester kit between hose no. 4A and hose no. 4B. Install test pressure gage in tee.
CAUTION
Make sure that the load valve is in full open position before performing test. When performing main
hydraulic pump pressure test, do not restrict oil flow beyond operating pressure.
With main engine operating at 1800 rpm, operating pressure should be 1950–2050 psi (13,445–14,135
kPa) when restricting flow using load valve.
After testing, remove hose no. 4B from pump port no. 1. Remove pilot-operated relief and unloading
valve assembly from pump port no. 44. Install hose no. 4B on pump port no. 44.
With main engine operating at 1800 rpm, operating pressure should be 1950–2050 psi (13,445–14,135
kPa) when restricting flow using load valve.
a.
Remove mechanical transmission and main hydraulic pump assembly (WP 0065 00).
b.
Replace main hydraulic pump (WP 0065 00).
32.
Inspect system selector valve lever for improper position.
a.
Place system selector valve lever in MAIN position.
0008 00-5


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