TM 10-3930-659-20 12-22.    SECONDARY STEERING MANIFOLD REPLACEMENT. This task covers: a. Removal b. Installation Initial Setup: Equipment Conditions: Materials/Parts: • Parking brake set (see TM 10-3930-659-10). • Two preformed packings • Frame locking bar Installed (see TM 10-3930- 659-10). Tools/Test Equipment: • Cab skirts removed (see paragraph 14-6). • General mechanic's tool kit (Item 44, Appendix F) • Secondary steering switch removed (see paragraph 6-31). References: • Priority valve-to-secondary steering • TM 10-3930-659-10 manifold hose and fittings removed (see paragraph 12-9). • Secondary steering manifold-to-steering valve hose and fittings removed (see paragraph 12-13). • Secondary steering pump-to-secondary steering manifold hose and fittings removed (see para- graph 12-17). a. REMOVAL 1. Remove  secondary  steering  manifold  (2)  from adapter (4). 2. Remove adapter (4) and two preformed packings (3) from steering valve (1).  Discard preformed packings. TA707594 12-57