TM 10-3930-659-20 12-18.    SECONDARY STEERING PUMP-TO-HYDRAULIC OIL RETURN FILTER HOSE REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Materials/Parts: • Frame  locking bar installed (see TM  10-3930-   • Rags (Item 27, Appendix C) 659-10). • Three preformed packings • Left engine upper sideshield opened (see TM 10-3930659-10). References: Tools/Test Equipment: • TM 10-3930-659-10 • General mechanic's tool kit (Item 44, Appendix F) • Adjustable wrench (Item 49, Appendix F) NOTE A  suitable  container  should  be  used to catch any draining hydraulic fluid. Ensure   that   all   spills   are   properly cleaned. a. REMOVAL 1. Remove hose (3) from adapter (2). 2. Remove adapter (2) and two preformed packings (1) from secondary steering pump (4). Discard preformed packings. TA707589 12-50