12-93. TM 9-2320-361-20 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 Two locknuts EQUIPMENT CONDITION Parking brake set (TM 9-2320-361-10). 1. Remove seat backrest cushion (1) from backrest frame (2). 2. Remove two locknuts (3) and screws (5) from seat cushion (6) and seat frame (4). Discard locknuts (3). 3. Remove seat cushion (6) from seat frame (4). 1. Install seat cushion (6) on seat frame (4) with two screws (5) and new locknuts (3). 2. Install seat backrest cushion (1) on backrest frame (2). 12-155