TM   9-2320-273-20 Section ll MAINTENANCE ALLOCATION CHART FOR TRUCK, TRACTOR, M915, M916, AND M920 AND CHASSIS FOR M917, M918, AND M919 (Continued). (1) (2) (3) (4) (5) (6) MAINTENANCE GROUP COMPONENT/ASSEMBLY CATEGORY NUMBER REMARKS C O F H D 04 EXHAUST SYSTEM (Continued) Extension  Tube Inspect 0.1 Replace 0.4 Tailpipe Inspect 0.1 Replace 0.2 05 COOLING  SYSTEM 0501 Draincock Inspect 0.1 Replace 0.2 Radiator  Assembly Inspect 0.2 Service 0.2 Replace 3.0 Repair 2.0 Test 0.3 0502 Fan Shrouds Inspect 0.1 Replace 1.5 0503 Lines, Fittings, Hoses Inspect 0.1 Replace 2.5 Thermostat Replace 1.0 97 Thermostat  Housing Replace 1,0 Water Manifold Replace 2.0 Repair 2.0 Water  Control  Valve Inspect Replace 0.4 0504 Water Pump 0.1 Replace Repair 3.0 2.0 56 thru 70 0505 Fan Inspect 0.1 Replace 0.5 Fan Clutch Inspect 0.1 Replace 1.5 Water Pump Idler Pulley Replace 0.5 Crankshaft  Pulley Replace 0.1 Accessory Drive Belts Inspect 0.2 Adjust 0.2 Replace 1.0 B-8 MAINTENANCE FUNCTION TOOLS  AND EQUIPMENT Inspect 0.2