TM 10-3930-669-20 17-7.  BACKREST REPLACEMENT. This task covers: a.  Removal b.  Installation INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive: (Item 1, Appendix B) Wrench, Torque (0 to 600 lb-ft [0-813 N•m]) (Item 2, Appendix B) Lifting Device (minimum capacity 50 lbs.) Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) Forks removed (TM 10-3930-669-10) WARNING Backrest weighs 100 lbs (45 kg).  Attach suitable lifting device prior to removal or installation to prevent possible injury to personnel. a.    Removal.  Remove eight screws (1), washers (2), and backrest (3) from carriage (4). b. Installation.   Install backrest (3) on carriage (4) with eight washers (2) and screws (1).  Tighten screws to 180 lb- ft (244 N•m). NOTE Follow-on Maintenance: · Install forks (TM 10-3930-669-10). · Remove wheel chocks (TM 10-3930-669-10). END OF TASK 17-27

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