TM 9-2320-361-20 8-32. AIRBRAKE CUTOFF VALVES AND COUPLINGS REPLACEMENT (M764) This task covers: a. Removal b. Installation INITIAL SETUP: APPLICABLE MODELS M764 MATERIALS/PARTS Two drivescrews Lockwasher Antiseize tape (Appendix C, Item 27) GENERAL SAFETY INSTRUCTIONS Do not disconnect air couplings before draining air reservoirs. REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-20P EQUIPMENT CONDITION Parking brake set (TM 9-2320-361-10). Air reservoirs drained (TM 9-2320-361-10). 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 (11) from coupling half (10). 2. Remove chain (12) and dummy coupling (11) from frame (4). 3. Remove coupling half (10) from elbow (8). 4. Remove two drivescrews (13) and plate (9) from bracket (14). Discard drivescrews (13). 5. Remove elbow (8) from connector (6). 6. Remove air line (2) and elbow (1) from cutoff valve (15). 7. Remove nut (7), lockwasher (5), and cutoff valve (15) from frame (4). Discard lockwasher (5). 8. Remove connector (6) and nut (3) from cutoff valve (15). NOTE Wrap all male pipe threads with antiseize tape before installation. 1. 2. 3. 4. 5. 6. 7. 8. 9. Install connector (6) and nut (3) on cutoff valve (15). Install cutoff valve (15) with connector (6) on frame (4) with new lockwasher (5) and nut (7). Install elbow (1) and air line (2) on cutoff valve (15). Install elbow (8) on connector (6). Install plate (9) on bracket (14) with two new drivescrews (13). Install coupling half (10) on elbow (8). Install chain (12) and dummy coupling (11) on frame (4). Install dummy coupling (11) on coupling half (10). Make sure cutoff valve (15) handle is turned to OFF position. 8-78