TM  10-3930-643-34 BRAKE  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 8-10. Treadle Check Valve (S/N 2001 and above). (Sheet 1 of 3) This task covers: a.  Disassembly b. Cleaning/Inspection c.  Assembly INITIAL  SETUP Tools Tool Kit, General Mechanic’s Materials/Parts Cleaning  solvent  P-D-680 Automotive (App. C, Item 5) NSN 5180-00-177-7033 Clean cloth (App. C, Item 24) Shop Equipment, Automotive Maintenance  and  Repair: Field  Maintenance,  Basic, Torques Less  Power Seat (1) to 45 lb-ft. NSN 4910-00-754-0705 Shop Equipment, Automotive Maintenance  and  Repair: Field Maintenance NSN 4910-00-919-0076 EQUIPMENT   CONDITION References TM   10-3930-643-20 Condition   Description Check  valve  removed  from treadle valve. DISASSEMBLY 1. Using a 1-1/8” open end wrench, remove seat (l). 2. Remove  and  discard  diaphragm  (2)  and ring (3) from body (5). 3. Remove  and  discard  preformed  packing (4). Go to sheet 2 8-40