TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
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6-27. LOWER BALL JOINT REPLACEMENT This task covers: a. Inspection c. Installation b. Removal INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Pickle fork (Appendix B, Item 129) Materials/Parts Cotter pin (Appendix G, Item 14) Four locknuts (Appendix G, Item 128) (Basic/A1 Series) Four locknuts (Appendix G, Item 105) (A2 Series) Personnel Required One mechanic One assistant Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition Wheel removed (para. 8-3) 1. Chock rear wheels. 2. Raise and support front wheels 2 in. (5.1 cm) off ground. 3. Mark a line across the top screw (11) of steering arm cover (10). Mark should be parallel with lower control arm (9). 4. Set a 6-in. (15.3 cm) ruler upright between lower control arm (9) and marked screw (11). 5. Install prybar between lower control arm (9) and geared hub (5). Push down on prybar and try to move geared hub (5). 6. Measure any movement in the geared hub (5). Replace lower ball joint (3) if any movement is more than 1/8 in. (3.2 mm). 1. Raise and support lower control arm (9). 2. Remove cotter pin (7) and slotted nut (6) from lower ball joint (3) and geared hub (5). Discard cotter pin (7). NOTE Note direction of outer capscrews for installation. 3. Remove four locknuts (2), washers (1), capscrews (8), and washers (1) from lower ball joint (3) and lower control arm (9). Discard locknuts (2). 4. Using puller, remove ball joint (3) with boot retainer (4) from geared hub (5). NOTE • Lower ball joint replacement procedures are the same for all models, except M996, M997, M1037, M1042, M1097, M1123, and “A1” and “A2” series vehicles. These have heavy duty rear lower ball joints and the locknuts securing ball joints to rear lower control arms on these vehicles must be tightened to 60 lb-ft (81 N•m). • Ensure outer capscrews on front ball joints are installed from top down and inner capscrews are installed from bottom up for M1123 and “A2” series vehicles only. 1. Install ball joint (3) with boot retainer (4) to lower control arm (9), ensuring ball joint (3) is placed below lower control arm (9) with four washers (1), capscrews (8), washers (1), and locknuts (2). Tighten locknuts (2) to 35 lb-ft (47 N•m). c. Installation b. Removal a. Inspection TM 9-2320-280-20-2 6-60 Change 3