TM 9-2320-361-20 14-30. PRIMARY AND SECONDARY HEATER EXHAUST TUBE REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: APPLICABLE MODELS EQUIPMENT CONDITION M109A3 and M185A3 Parking brake set (TM 9-2320-361-10). MATERIALS/PARTS GENERAL SAFETY INSTRUCTIONS O-ring Do not touch hot exhaust system components with REFERENCES (TM) bare hands. TM 9-2320-361-10 TM 9-2320-361-20P WARNING Do not touch hot exhaust system components with bare hands; injury to personnel will result. 1. Remove two screws (4) and washers (2) from clamp (3) and van body (7). 2. Remove nut (1), washer (2), screw (9), and clamp (3) from outside exhaust tube (5). 3. Remove four screws (8), O-ring (6), and outside exhaust tube (5) from van body (7). Discard O-ring (6). 1. Install new O-ring (6) and outside exhust tube (5) on van body (7) with four screws (8). 2. Install clamp (3) on outside exhaust tube (5) with screw (9), washer (2), and nut (1). 3. Install clamp (3) on van body (7) with two screws (4) and washers (2). 14-46