TM 5-3805-262-343-21. CHECKS AND ADJUSTMENTS AND FLOWMETER TESTS (CONT)d. CircuitReliefValvesPressureSetting CheckandAdjustment(SHEET1OF3).This task covers checking and adjustment of control valve assembly circuit reliefvalves pressure settings. There are four circuit relief valves used in the controlvalve assembly. These are used to protect the clam and bucket circuits.TOOLS: No. 1 Common Organizational Maintenance Tool KitFixed open end wrench setSlip joint pliersDrill, 1/2 inch capacityDrill bit, 1/4 inch diameterDrive pin punch, 1/8 inch pointHand pump (FSCM 45225 PN CAS-10090)Fitting kit (FSCM 45225 PN CAS-10111)Adjusting tool (fabricate from 1/2 inch Allen wrench, 1-1/2 inches longwith a 3/8 inch diameter hole drilled completely through it)Pipe plugMATERIALS/PARTS: Clean cloths (Appendix C, item 1)Cleaning solvent P-D-680 (Appendix C, item 2)Expansion plug (FSCM 10988 PN 41-14)NOTEPRELIMINARY PROCEDURE: Control levers operated several times in both di-rections to relieve hydraulic pressure, front access door unlocked andopen, and hydraulic reservoir fill cap loosened.Hydraulic system pressure is over2000 psi and hydraulic reservoiris pressurized with compressedair.Before loosening ordisconnecting any hydraulichoses, lines, or fittings,operate all hydraulic controllevers to relieve hydraulicsystem pressure. Failure to do socould cause serious injury ordeath. If you are injured obtainmedical assistance immediately.NOTEEnsure that hand pump is full ofhydraulic oil and that tempera-ture of hand pump hydraulic oilis between 70 to 80 degrees F.(1) Disconnect line between cylinder and control valve assembly in the cir-cuit in which the circuit relief valve is to be checked:NOTEClean all dirt and grease from hose and tube fittings before discon-necting them.3-624
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