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4-10.  RUST REMOVAL
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TM-9-5130-338-12P Forward Repair System (FRS) Model M7 Manual
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f. Installation
TM 9-5130-338-12&P 4-11.  IMPACT HEAD SERVICING AND REPAIR-Continued. a. Servicing.  When performing semiannual servicing, perform all steps in this paragraph. b. Removal. NOTE Trigger (1) must be depressed to remove hammer case (2). 1. Remove  four  capscrews  (3)  and  four  lockwashers  (4)  securing  hammer  case  (2)  to  main  housing  (5). Discard lockwashers. 2. Remove and discard hammer case gasket (6). NOTE Remove hammer case bushing (7) only if damaged.  Refer to paragraph 4-19 for inspection. 3. Remove hammer case bushing (7) from hammer case (2). NOTE Inertia insert (8) may adhere to main housing (5) or hammer frame assembly (9). 4. Remove hammer frame assembly (9) from main housing (5). NOTE Pilot ring (10) may adhere to either hammer case (2) or main housing (5). 5. Remove pilot ring (10) from hammer case (2). c. Disassembly. NOTE To aid in proper installation, note position of hammer (11) before disassembly. If inertia insert (8) remains with hammer frame assembly (9), remove prior to performing following step. 1. Remove anvil (12), two hammer pins (13), and hammer (11) from hammer frame (14). 2. Remove inertia insert (8), thrust race (15), thrust bearing (16), and thrust race (17). d. Inspection.  Inspect impact head assembly (18) in accordance with paragraph 4-19. e. Assembly. 1. Lubricate all parts of hammer frame assembly (9) with grease. 2. Install thrust race (17), thrust bearing (16), and thrust race (15) in main housing (5). 3. Install inertia insert (8) in main housing (5). 4-8

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