TM 10-3930-659-20 12-1. STEERING SYSTEM LEAKAGE TEST (Con't). 25. Remove plug (7) and preformed packing (8) from tee (9).  Discard preformed packing. 26. Install new preformed packing (17) and hose (18) on tee (9). b. CROSSOVER RELIEF VALVE PRESSURE TEST 1. Warm hydraulic system to operating temperature (see paragraph 2-29). 2. Remove hose (22) and preformed packing (20) from priority valve (19).  Discard preformed packing. 3. Install tee (21) and new preformed packing (20) on priority valve (19). 4. Install two preformed packings (23) on tee (21). 5. Install hose (22) on tee (21). 6. Install hose (25) and pressure gage (24) on tee (21). 7. Remove hose (28) from adapter (27). 8. Remove    adapter    (27)    and    two    preformed packings  (26)  from  priority  valve  (19).    Discard preformed packings. 9. Turn  adjusting  screw  (29)  clockwise  one-eighth turn. 10. Install   two   new   preformed   packings   (26)   and adapter (27) on priority valve (19). 11. Install hose (28) on adapter (27). 12. Start engine and run at slow engine idle speed (see TM 10-3930-659-10). NOTE Steering wheel must be turned rapidly to obtain accurate pressure reading. 13. Holding firm, constant pressure on steering wheel, turn steering wheel rapidly and note reading on pressure gage (24). 14. Repeat steps 7 through 13 until pressure reading on pressure gage (24) does not increase from previous reading. TA707549 12-5