TM 9-2350-238-34-22-39. MAINTENANCE OF PRESSURE RELIEF VALVE 12253778-1 AND PRESSURERELIEF VALVE 12253778-2.This task covers: a.Disassemblye. Adjustment of boom cylin-b. Inspection/Repairder pressure relief valvec. Reassemblyf. Adjustment of tow winchd. Adjustment of checkpressure relief valvev a l veg. Adjustment of boom winchpressure relief valveINITIAL SETUPTools and Special ToolsGeneral Safety InstructionsGeneral mechanic’s tool kit, automotive(SC 5180-90-CL-N26)Oil pressure tester (8356176)Retaining ring pliers set (PR36)l Make sure all personnel stand clearwhen operating boom to avoid in-Materials/Partsjury to personnel.Engine oil (item 15, appx B)Packing assortment kit (5705012)l When testing hydraulic system, besure boom is in stowed position, asfailure of system may result in in-Referencesjury to personnel.TM 9-2350-238-10TM 9-2350-238-24P-2l Hydraulic system is under highpressure. Follow system safety pro-cedures to prevent injury (TM 9-Equipment Conditions2350-238-20-2). Wipe up spilled2-154 Pressure relief valves removedhydraulic fluid.from counterbalance manifold2-179
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