TM 9-2320-361-20 8-31. AIRBRAKE CUTOFF VALVES AND COUPLINGS REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: APPLICABLE MODELS All (except M275A2, M342A2, and M764) EQUIPMENT CONDITION MATERIALS/PARTS Parking brake set (TM 9-2320-361-10). Air reservoirs drained (TM 9-2320-361-10). Lockwasher Antiseize tape (Appendix C, Item 27) GENERAL SAFETY INSTRUCTIONS Do not disconnect air couplings before draining air REFERENCES (TM) reservoirs. TM 9-2320-361-10 TM 9-2320-361-20P 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 (12). 2. Remove chain (13) and dummy coupling (11) from bracket (9). 3. Remove coupling half (12), nipple (10), and elbow (8) from cutoff valve (7). 4. Remove airline (2) and elbow (1) from connector (5). 5. Remove nut (3), cutoff valve (7) with connector (5), and lockwasher (4) from frame (14). Discard lockwasher (4). 6. Remove nut (6) and connector (5) from cutoff valve (7). b. Installation NOTE Wrap all male pipe threads with antiseize tape before installation. 1. Install connector (5) and nut (6) on cutoff valve (7). 2. Install new lockwasher (4) and cutoff valve (7) with connector (5) on frame (14) with nut (3). 3. Install elbow (1) and air line (2) on connector (5). 4. Install elbow (8), nipple (10), and coupling half (12) on cutoff valve (7). 5. Install chain (13) and dummy coupling (11) on bracket (9). 6. Install dummy coupling (11) on coupling half (12). 7. Make sure cutoff valve (7) handle is turned to OFF position. 8-76