TM 5-3805-262-343-12. AIR BRAKE SYSTEM MAINTENANCE (CONT)c. PressureProtectionValve.This task covers disassembly, cleaning, inspec-tion, reassembly, and adjustment of pressure protection valve.TOOLS: No. 1 Common Organizational Maintenance Tool KitSafety glassesFixed open end wrench setViseDrive pin punch, 1/8 inch pointAir pressure regulatorAir hose with 1/4 NPTF fitting on one endMATERIALS/PARTS: Clean cloths (Appendix C, item 1)Cleaning solvent P-D-680 (Appendix C, item 2)Silicone lubricant (Appendix C, item 18)Paint (Appendix C, item 22)O-ring (FSCM 06853 PN 242391)O-ring (FSCM 06853 PN 236640)REFERENCE: TM 5-3805-262-20NOTEPRELIMINARY PROCEDURE: Pressure protection valve removed from loader(refer to TM 5-3805-262-20).DISASSEMBLY (SHEET 1 OF 2)(1)(2)(3)ToofPut pressure protection valve body (12) in vise as shown.Using paint or other suitable marker, makematch marks on cap (1) and body (12) to aidreassembly.Hold cap (1) to prevent itfrom turning and loosen nut(2).NOTEaid reassembly, note and record numberturns required to remove cap (1) whenperforming following step.(4) Remove cap (1) and record numberof turns.(5) Remove nut (2).(6) Remove spring (3) from piston (11).3-452
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