TM 9-2350-256-34-2
Table 2-3. Troubleshooting--Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HOIST WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM)-Continued
WARNING
Test components must be capable of withstanding a working pressure of 1950-2050 psi. (Step 2 only).
NOTE
After performing main hydraulic pump test, return all plumbing to original configuration.
Step 2.
Test main hydraulic pump. Remove check valve a
nd tee between hose no. 4A and 4B. Install main hydraulic pump pressure tester kit
(Item 14, Table 2-1) 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 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 when restricting flow using load valve.
a. Remove mechanical transmission and main hydraulic pump assembly. Refer to TM 9-2350-256-34-1, Medium
Recovery Vehicle, M88A1.
b. Replace main hydraulic pump. Refer to paragraph 3-16.
Step 3.
Inspect system selector valve lever for improper position.
Place system selector valve lever in MAIN position.
MECHANICAL TRANSMISSION AND MAIN HYDRAULIC PUMP CIRCUIT
(MAIN HYDRAULIC SYSTEM)
15. MECHANICAL TRANSMISSION FAILS TO OPERATE
Step 1.
Inspect mechanical transmission drive shaft.
If not rotating, repair or replace. Refer to TM 9-2350-256-34-1, Medium Recovery Vehicle, M88A1.
Change 5
2-12
