TM 10-3930-659-20 12-1. STEERING SYSTEM LEAKAGE TEST. This Task Covers: a. Steering System Leakage Test b. Crossover Relief Valve Pressure Test Initial Setup: Equipment Conditions: Materials/Parts: • Parking brake set (see TM 103930659-10). •  Rags (Item 27, Appendix C) • Direction selector lever in N (Neutral) position and •   Fifteen preformed packings locked (see TM 10-3930-659-10). Tools/Test Equipment: • Frame locking bar installed (see TM 10-3930- 659-10). •  General mechanic's tool kit (Item 44, Appendix F) • Hydraulic system warmed to operating temperature •  Cap (Item 5, Appendix F) (see paragraph 2-29). •  Cap (Item 6, Appendix F) • Right and left side cab skirts removed (see para- •  Pressure gage (Item 18, Appendix F) graph '.4-6). •  Hose assembly (Item 20, Appendix F) • Right and left transmission side guards removed •  Plug (Item 29, Appendix F) (see paragraph 14-7). •  Plug (Item 30, Appendix F) Personnel Required:  Two References: •  TM 10-3930659-10 NOTE A suitable container should be used to catch any draining hydraulic fluid.  Ensure that all spills are properly cleaned. a. STEERING SYSTEM LEAKAGE TEST 1. Start engine and operate at fast engine idle speed (see TM 103930-659-10). NOTE • Some rotation of steering wheel Is normal.  Excessive rotation of steering wheel while frame  Is  locked  Indicates  leakage  In  steering  system.    This  test  will  Identify  which steering system component Is leaking. • Steering wheel must be turned rapidly to obtain an accurate count of the revolutions per minute. 2. Holding firm, constant pressure on steering wheel, turn steering wheel rapidly for one minute counting number of steering wheel revolutions.  Repeat step turning steering wheel In opposite direction.  Steering wheel must rotate less  than  5  revolutions  per  minute  In  each  direction.    If  steering  wheel  revolutions  per  minute  count  Is  within specification, test is complete and no leakage is indicated.  If steering wheel revolutions per minute count is not within specification, perform step 3. 3. Shut down engine (see TM 103930-659-10). 12-2