TM 10-3930-659-20 17-21.    TRANSMISSION CLUTCH CUT OFF VALVE-TO-TRANSMISSION CONTROL VALVE- HOSE REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Materials/Parts: •    Parking brake set (see TM 10-3930-659-10). • Four preformed packings •    Frame locking bar installed (see TM 10-3930-  Tools/Test Equipment: 659-10). •    Right transmission side guard removed (see • General mechanic's tool kit (Item 44, Appendix F) paragraph 14-7). •    Right side cab skirt removed (see paragraph    References: 14-6). • TM 10-3930-659-10 a. REMOVAL 1. Remove hose (5) and preformed packing (6) from elbow (7).Discard preformed packing. 2. Remove  elbow  (7)  and  preformed  packing  (8)  from  transmission  clutch  cutoff  valve  (9).Discard  preformed packing. 3. Remove hose (5) and preformed packing (4) from check valve (3).Discard preformed packing. 4. Remove  check  valve  (3)  and  preformed  packing  (2)  from  transmission  control  valve  (1).Discard  preformed packing. b. INSTALLATION 1. Install new preformed packing (2) and check valve (3) on transmission control valve (1). 2. Install new preformed packing (4) and hose (5) on check valve (3). 3. Install new preformed packing (8) and elbow (7) on transmission clutch cutoff valve (9). 4. Install new preformed packing (6) and hose (5) on elbow (7). 17-66