TM10-3930-660-20 18-9. RELIEF VALVE, FRAME TILT/BRAKES - TEST/REPLACE (Cont‘d) a. b. c. Start engine, TM10-3930-660-10. Operate frame tilt function and tilt vehicle from side to side five  times. Stop engine and relieve hydraulic pressure by operating frame tilt controls,  TM10-3930-660-10. ADJUSTMENT 1. 2* 3. REMOVE RELIEF VALVE INLET LINE AND INSTALL  A  TEST  TEE. a. b. c. Remove relief valve inlet line (7). Connect a test tee to inlet line (7). Connect other side of test tee to relief valve inlet port (8). CONNECT 0 TO 5000 PSI PRESSURE GAUGE TO TEST TEE. START ENGINE, TM10-3930-660-10. Engine may be operated at idle or full throttle when performing pressure tests. 4. READ RELIEF VALVE PRESSURE ON GAUGE. PRESSURE RANGE IS 1,700 TO 1,800 PSI. IF RELIEF VALVE PRESSURE IS NOT WITHIN SPECIFICATIONS, ADJUST AS FOLLOWS  : a. b. c. Remove acorn nut (9) covering slotted head adjusting screw. While holding adjusting screw, loosen and back off jam nut (10) which secures adjusting screw. To increase relief pressure, turn adjusting screw clockwise (in). To decrease pressure, turn adjusting  screw  counterclockwise (out) . 18-40