TM 5-3810-306-20BRAKE CHAMBER INSTALLATIONTOOLS:General mechanic’s tool kit: automotive (5180-00-177-7033)SUPPLIES:NoneEQUIPMENT CONDITIONS: Disconnect ground cable at shunt. (Refer to page 8-109.)Tire and wheel assembly removed. (Refer to page 12-2.)REMOVAL:WARNINGNever attempt to remove spring brakechamber clamp (8) without firstcaging spring brake (1). The springis powerful enough to cause parts tofly apart with explosive force causingpersonnel injury and equipmentdamage.1.MANUALLY CAGE SPRING BRAKE CHAMBER(1).a. Locate and remove caging bolt (2) nut (3) andwasher (4) on side of brake chamber.b. Remove rubber cap (5) from rear of brakechamber.c. Install caging bolt into hole in brake chamberand rotate one quarter turn to lock it in chamber.d. Thread nut (3) with washer (4) on bolt (2) andtighten 18-21 turns.NOTEDo not force nut beyond its normalstop. Thirty (30) pounds-foot torqueis maximum that should be required.Uncaging spring is accomplished byreversing procedure.2.TAG AND DISCONNECT AIR LINES TO SPRINGBRAKE CHAMBER.3.REMOVE SPRING BRAKE CHAMBER.a. Loosen collet nut (6) on stem of brake chamberwith a drift punch and hammer. Remove entirebrake chamber by threading it out of plungerhousing.b. Pull wedge assembly (7) out of plunger housing.INSTALLATION:1.INSTALL WEDGE ASSEMBLY.a. Install wedge assembly (7) into the plungerhousing. Check for the correct roller-plungerengagement by pushing on wedge rod by handwhile checking for plunger and shoe lift, ormeasure standout of wedge rod from end ofthreaded housing bore. When properlyassembled, wedge standout is 2.25 inches (57.2mm).2.INSTALL BRAKE CHAMBER ASSEMBLY.a. Install collet nut (6) on stem of brake chamberhousing (1).b. Install air brake chamber by threading it intoplunger housing.c. Tighten collet nut (6) on stem of air brakechamber housing (1) using a drift and hammer.11-4
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