WATER PUMP, THERMOSTAT & IDLER PULLEYS - CONT

WATER PUMP, THERMOSTAT & IDLER PULLEYS - CONT - TM-5-3820-256-24-5_317

WATER PUMP, THERMOSTAT & IDLER PULLEYS - CONT - TM-5-3820-256-24-5_319

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL WATER PUMP, THERMOSTAT & IDLER PULLEYS Section 9 SPECIFICATIONS: DIMENSION VALUE Water Pump Impeller Vane Height to Mounting ..............................................................................................................0.25 mm 0.010 in. Face of Housing (7 Vane ) ..............................................................................................................0.25 mm 0.02210 in. Clearance Between Housing and Back Face of Impeller (4 Vane & 8 Vane) Light Duty ....................................................................................................................................................0.25 mm 0.010 in (with Pressed-On Hub) ..................................................................................................................... 1.17 mm 0.046 in.* Heavy Duty ...................................................................................................................................................0.25mm 0.010 in. with Nut Retained Hub) (4 & 8 Vane) ........................................................................................................ 1.17mm 0.046 in.* Heavy Duty (with Nut Retained Hub) (7 Vane)........................................................................................................0.31 mm 0.012 in. ........................................................................................................................................................... 1.63 mm 0.064 in.* Bearing End Play.....................................................................................................................................0.038 mm 0.0015 in. (Roller Bearing Only) .......................................................................................................................0.241 mm 0.0095 in. *All dimension with end play of shaft to rear. WATER PUMP INSPECTION It is recommended that water pump assemblies be inspected at every oil change interval for coolant leakage and bearing end play. The water pump should be removed, disassembled and inspected every 120,000 mi. (193, 121 Km.), 4000 hours or 27 months, whichever occurs first. Water Pump Inspection at Oil Change Interval 6000 Mile (9600 KM.), 200 Hours or 3 Months Coolant Leakage Each water pump housing features an inspection port (9, Fig. 8) which allows operators and maintenance personnel to determine if the water pump seal is leaking coolant. Ex- amine the inspection port for the presence of coolant or blockage by grease or dust. If coolant or excessive grease is present at the inspection port, remove the pump (refer to "Removal" this section) and install a new, ReNEWed or locally rebuilt assembly. Remove any inspection port blockage with a wire or rod. IMPORTANT: I F BLOCKAGE IS NOT REMOVED, and the water pump seal leaks, coolant will enter the bearings and damage the bearings and shaft. Bearing End Play Verify end play by grasping the water pump pulley hub (7, Fig. 8) and moving the pulley fore and aft. Specified end play is 0.038 to 0.241 mm (0.0015 to 0.0095 in.). If the end play appears to be excessive completely loosen all belts and measure end play using a dial indicator. Replace the assembly if 0.241 mm (0.0095 in.) is exceeded. 120,000 Mile (193, 121 Km), 4000 Hour or 27 Month Inspection CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 3

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