TM 9-2320-361-20 12-92. EARTH BORING MACHINE SEAT FRAME REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM] M764 TM 9-2320-361-10 MATERIALS/PARTS TM 9-2320-361-20P Cotter pin EQUIPMENT CONDITION Four locknuts ● Parking brake set (TM 9-2320-361-10). ● Earth boring machine seat and seat backrest cushion removed (para. 12-93). 1. Remove cotter pin (11), washer (12), spring ( 10), pin (2), and seat adjustment handle (3) from seat frame (1), Discard cotter pin (11). 2, Remove four locknuts (4) and washers (5) from seat frame (1). Discard locknuts (4). 3. Remove seat frame (1) and four washers (13) from seat base (6). 4. Remove safety pin (7), pin (9), and seat base (6) from boring machine (8). 1. Install seat base (6) on boring machine (8) with pin (9) and safety pin (7). NOTE Seat frame must slide freely after installation. 2. Install four washers (13) and seat frame (1) on seat base (6) with four washers (5) and new locknuts (4). 3. Install seat adjustment handle (3) on seat frame (1) with pin (2), spring (10), washer (12), and new FOLLOW-ON TASK: Install earth boring machine seat and seat backrest cushion (para. 12-93). 12-154