TM 9-2320-361-20 8-33. AIRBRAKE CUTOFF VALVES AND COUPLINGS REPLACEMENT (M275A2, M342A2) This task covers: a. Removal b. Installation INITIAL SETUP: APPLICABLE MODELS EQUIPMENT CONDITION M275A2, M342A2 Parking brake set (TM 9-2320-361-10). MATERIALS/PARTS Air reservoirs drained (TM 9-2320-361-10). Lockwasher GENERAL SAFETY INSTRUCTIONS Antiseize tape (Appendix C, Item 27) Do not disconnect air couplings before draining air REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-20P reservoirs. a. Removal WARNING Do not disconnect air couplings before draining air reservoirs. Small parts under pressure may shoot out with high velocity, causing injury to personnel. NOTE The right emergency and left service couplings and cutoff valves are replaced the same. This procedure covers the right side of service brake. 1. Remove dummy coupling (8) from coupling half (9). 2. Remove dummy coupling (8) and chain (11) from bracket (12). 3. Remove coupling half (9) from nipple (10). 4. Remove nipple (10) from cutoff valve (7). 5. Remove air line (2) and elbow (1) from connector (4). 6. Remove nut (13), lockwasher (3), and cutoff valve (7) from frame (12). Discard lockwasher (3). 7. Remove connector (4), nut (5), and elbow (6) from cutoff valve (7). b. Installation NOTE Wrap all male pipe threads with antiseize tape before installation. 1. 2. 3. 4. 5. 6. 7. 8. Install connector (4), nut (5), and elbow (6) on cutoff valve (7). Install cutoff valve (7) on frame (12) with new lockwasher (3) and nut (13). Install elbow (1) and air line (2) on connector (4). Install nipple (10) on cutoff valve (7). Install coupling half (9) on nipple (10). Install chain (11) and dummy (8) on coupling half (9). Install dummy coupling (8) on coupling half (9). Make sure cutoff valve (7) handle is in OFF position. 8-80