TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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6-23. UPPER BALL JOINT MAINTENANCE This task covers: a. Inspection c. Installation b. Removal INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Maintenance and repair shop equipment: automotive (Appendix B, Item 2) Special Tools Socket adapter (Appendix B, Item 135) Crowfoot, 15/16 in. (Appendix B, Item 140) Materials/Parts Cotter pin (Appendix G, Item 34) Four locknuts (Appendix G, Item 116) Personnel Required One mechanic One assistant Manual References TM 9-2320-387-10 TM 9-2320-387-24P Maintenance Level Unit 1. Chock rear wheels. 2. Raise and support front wheels 2 in. (5.1 cm) off ground. NOTE If boot is ripped or torn, upper ball joint is unserviceable. 3. Visually inspect ball joint boot (7), and replace upper ball joint (2) if boot is ripped or torn. 4. Grasp top of tire and attempt to move tire in and out. Observe upper control arm (1) and gear hub (3) where upper ball joint (2) is mounted. If lateral movement is observed, upper ball joint (2) may be worn. 5. Remove wheel (para. 8-3). 6. Remove cotter pin (5) and slotted nut (4) from upper ball joint stud (6). Discard cotter pin (5). 7. Separate upper control arm (1) from geared hub (3) at upper ball joint (2) end and push geared hub (3) to one side. 8. Install slotted nut (4) on threaded end of upper ball joint stud (6) until it bottoms out on taper of upper ball joint (2). 9. Using crowfoot and adapter, tighten slotted nut (4) and observe torque reading. If torque reading is below 20 lb-in. (2.3 N•m), upper ball joint (2) is unserviceable and must be replaced. Remove slotted nut (4), and go to task b. 10. If torque reading is above 20 lb-in. (2.3 N•m), upper ball joint (2) is serviceable. Go to task c. a. Inspection TM 9-2320-387-24-1 6-52 Change 1