TM 10-3930-659-20 12-20.    SECONDARY STEERING MANIFOLD PRIMARY CHECK VALVE LEAKAGE TEST. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Materials/Parts: Parking brake set (see TM 10-3930-659-10). Rags (Item 27, Appendix C) Frame  locking bar Installed (see TM  10-3930-   • Two preformed packings 659-10). Hydraulic system warmed to operating Personnel Required:  Two temperature (see paragraph 2-29). Right transmission side guard removed (see    References: paragraph 14-7). TM 10-3930-659-10 Tools/Test Equipment: General mechanic's tool kit (Item 44, Appendix F) Cap (Item 6, Appendix F) NOTE A suitable container should be used to catch any draining hydraulic fluid.  Ensure that all spills are properly cleaned. LEAKAGE TEST 1. Remove hose (3) and preformed packing (2) from priority valve (1).  Discard preformed packing. 2. Install preformed packing (5) and cap (4) on priority valve (1). CAUTION DO NOT operate secondary steering pump and secondary steering pump motor for more than 15 seconds.    Failure  to  follow  this  caution  may  damage  secondary  steering  pump  and  secondary steering pump motor. NOTE Ensure that engine does not start when operating Ignition switch. 3. Turn ignition switch to START position and release to activate secondary steering pump. 4. If hose (3) leaks a steady stream of hydraulic fluid, replace secondary steering manifold (see paragraph 12-22). 5. Remove cap (4) and preformed packing (5) from priority valve (1).  Discard preformed packing. 6. Install new preformed packing (2) and hose (3) on priority valve (1). 12-54

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