TM 9-2350-238-34-22-39. MAINTENANCE OF PRESSURE RELIEF VALVE 12253778-1 AND PRESSURERELIEF VALVE 12253778-2 (CONT).ADJUSTMENT OF TOW WINCH PRESSURE RELIEF VALVE. OIL PRESSURE TESTER1 Perform adjustment of check valve procedures.2 Turn off hydraulic system. Refer to TM 9-2350-238-10.3 Remove spring cap (1) from tow winch pressure relief valve (2).4 Install 3000 psi (20,685 kPa) oil pressure tester in test port (3).5 Pull up lock trigger (4).6 Set tow winch control lever (5) to HI. 7 Pull out TOW WINCH BREAKE PRESSURESELECTOR knob (6).2-186
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