TM 10-3930-659-20 12-17.    SECONDARY STEERING PUMP-TO-SECONDARY STEERING MANIFOLD HOSE REPLACEMENT (Con't). 3. Remove hose (3) from elbow (5). 4. Remove elbow (5) and two preformed packings (6) from secondary steering pump (7).  Discard preformed packings. b. INSTALLATION 1. Install two new preformed packings (6) and elbow (5) on secondary steering pump (7). 2. Install hose (3) on elbow (5). TA707587 12-48