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 88 of 584

TM 9-2350-256-34
0009 00
CORRECTIVE ACTION –Continued
4.
Inspect mechanical transmission outfit shaft. If not rotating, proceed with mechanical transmission
clutch pressure check. Install pressure gage in mechanical transmission clutch pressure line. 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).
5.
Test for defective power control valve. Remove hose no. 66 from valve. With power control valve
lever in ON position, and mechanical transmission input shaft rotating, oil should flow from valve port.
a.
Replace power control valve (WP 0053 00).
6.
Inspect main hydraulic pump for broken or damaged shaft coupling.
a.
Remove mechanical transmission and main hydraulic pump assembly (WP 0065 00).
b.
Repair or replace shaft coupling (WP 0065 00).
WARNING
Test components must be capable of withstanding a working pressure of 1950–2050 psi (13,445–14,135
kPa) (step 7 only).
NOTE
After performing main hydraulic pump test, return all plumbing to original configuration.
7.
Test main hydraulic pump. Remove check valve and tee between hose no. 4A and hose no. 4B. Install
main hydraulic pump pressure 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).
8.
Test for improperly adjusted pilot operated relief and unloading valve. Install test gage in valve gage
port. With engine operating at 1800 rpm and spade in stowed position, place spade combination control
valve lever in RAISE position and adjust relief valve.
a.
Adjust relief pressure to 1950–2050 psi (13,445–14,135 kPa). For location of valve gage port and
adjusting screw, refer to WP 0065 00.
0009 00-2


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