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Section II.  TROUBLESHOOTING
MAIN WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM (cont)

TM-9-2350-256-34-2 Recovery Vehicle Full Tracked; Medium M88A1 (NSN 2350-00-122-6826) Manual
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TM 9-2350-256-34-2 Table2-3.  Troubleshooting-Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION MAIN WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM)--Continued WARNING Test components must be capable of withstanding a working pressure of 1950-2050 psi (step 7 only). NOTE After performing main hydraulic pump test, return all plumbing to original configuration. Step 7. Test main hydraulic pump.  Remove check valve and 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.    413  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 8. Test for improperly adjusted pilot operated relief and unloadling 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. Adjust relief pressure to 1950-2054 psi.  For location of valve gage port, and adjusting screw, refer to views B and C, fig.  3-22. Step 9. Inspect all hydraulic hoses and connections for visible indication of oil leaks. Repair leaks or replace hydraulic hose.  Refer to TM 9-2350-256-20.  Medium Recovery Vehicle, M88A1. Change 5  2-6.1







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