RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
HYDRAULIC IMPACT WRENCH (AUXILIARY HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
Tools and Special Tools
Hydraulic Impact Wrench (Auxiliary Hydraulic System)
Hydraulic impact wrench (auxiliary hydraulic system) malfunctioning.
Impact wrench does not operate.
Inspect all hydraulic hoses and connections for visible indication of oil leaks.
Repair leaks or replace hydraulic hose (TM 9-2350-256-20).
Inspect system selector valve lever for improper position.
Place system selector valve lever in REFUEL position.
Test components must be capable of withstanding a working pressure of 14501550 psi (999810,687
kPa) (step 3 only).
Test for broken drive mechanism or faulty auxiliary hydraulic pump. Disconnect auxiliary hydraulic
pump discharge hose no. 12. Install suitable gate valve, in conjunction with pressure gage, to outlet
to auxiliary hydraulic pump. When restricting oil flow, operating pressure should be 14501550 psi
When performing auxiliary hydraulic pump pressure test, do not restrict oil flow beyond operating
Remove APU from vehicle, and replace broken auxiliary hydraulic pump drive mechanism parts, or
Test for faulty or improperly adjusted relief valve within the system selector valve. Install pressure
gage in system selector valve gage port. With APU operating, and APU emergency winch control