3500B Engines and 776D, 777D, 784C, 785C, 789C, 793C and 793D Off-Highway Truck/Tractors Caterpillar


Auxiliary Water Pump

Usage:

785C 1HW

Type 1



Illustration 1g03324421

Table 1
Specification for 1W-0410 Auxiliary Water Pump Gp 
Item  Qty  Part  Specification description 
423-0938 Thrust Washer  Thickness of the new thrust washer is 6.120 ± 0.025 mm (0.2409 ± 0.0010 inch)
Width of the groove in the 430-9695 Shaft for thrust washer is 6.25 ± 0.05 mm (0.246 ± 0.002 inch)
9X-4594 Lip Type Seal  Do not lubricate the sealing lip. 
Rubber Seal  Use the following procedure in order to assemble the water pump seal assembly:

1. Lubricate the outside diameter of ceramic ring and rubber seal (2) with clean water or with 207-1600 Rubber Lubricant.
2. Orient the polished face of the ceramic ring toward water pump seal assembly.
3. Use the installation tool and hand pressure to seat the ceramic ring and the rubber seal into the water pump housing.
4. Remove spring (4) from the water pump seal assembly.
5. Lubricate the inside diameter of the water pump seal assembly with clean water or with 207-1600 Rubber Lubricant.
6. Use the seal installation tool and hand pressure to install the water pump seal assembly onto the shaft until the face of the water pump seal assembly makes light contact with the face of the ceramic ring and rubber seal.
7. Install spring (4) onto the water pump seal assembly. 
262-4378 Water Pump Seal As 
Spring 
235-3546 O-Ring Seal  Before assembly, lubricate the bore lightly with clean engine oil. 
212-8183 Impeller  Before assembly, bore in the impeller for shaft is 19.000 ± 0.013 mm (0.7480 ± 0.0005 inch)
430-9695 Shaft  Lubricate the shaft with a thin film of clean engine oil before pressing the impeller onto the shaft. The end of the shaft must be flush with the face of the impeller within 0.00 to 0.30 mm (0.000 to 0.012 inch).
Diameter of the new shaft for impeller is 19.050 to 19.063 mm (0.7500 to 0.7505 inch)
9M-3786 O-Ring Seal  Before assembly, lubricate the bore with clean engine oil, glycerin, or clean water. 
127-5400 Bushing  After assembly, bore for auxiliary drive shaft is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).
Diameter of new auxiliary drive shaft (not shown) is 74.900 ± 0.015 mm (2.9488 ± 0.0006 inch).
Installation depth of the bushing in the water pump housing is 1.5 ± 0.5 mm (0.06 ± 0.02 inch)
10  0S-1594 Bolt  Tighten the bolts to standard torque. 

Type 2



Illustration 2g03324422

Table 2
Specification for 317-5901 Auxiliary Water Pump Gp 
Item  Qty  Part  Specification description 
423-0938 Thrust Washer  Thickness of the new thrust washer is 6.120 ± 0.025 mm (0.2409 ± 0.0010 inch)
Width of the groove in the 430-9695 Shaft for thrust washer is 6.25 ± 0.05 mm (0.246 ± 0.002 inch)
9X-4594 Lip Type Seal  Do not lubricate the sealing lip. 
Rubber Seal  Use the following procedure in order to assemble the water pump seal assembly:

1. Lubricate the outside diameter of ceramic ring and rubber seal (2) with clean water or with 207-1600 Rubber Lubricant.
2. Orient the polished face of the ceramic ring toward water pump seal assembly.
3. Use the installation tool and hand pressure to seat the ceramic ring and the rubber seal into the water pump housing.
4. Remove spring (4) from the water pump seal assembly.
5. Lubricate the inside diameter of the water pump seal assembly with clean water or with 207-1600 Rubber Lubricant.
6. Use the seal installation tool and hand pressure to install the water pump seal assembly onto the shaft until the face of the water pump seal assembly makes light contact with the face of the ceramic ring and rubber seal.
7. Install spring (4) onto the water pump seal assembly.

Minimum leakage per minute for the water pump seal assembly at 138 kPa (20 psi) of air pressure is less than 20 cc (1.2 cu in)
262-4378 Water Pump Seal As 
Spring 
212-8183 Impeller  Before assembly, bore in the impeller for shaft is 19.000 ± 0.013 mm (0.7480 ± 0.0005 inch)
430-9695 Shaft  Lubricate the shaft with a thin film of clean engine oil before pressing the impeller onto the shaft. The end of the shaft must be flush with the face of the impeller within 0.00 to 0.30 mm (0.000 to 0.012 inch).
Diameter of the new shaft for impeller is 19.050 to 19.063 mm (0.7500 to 0.7505 inch)
235-3546 O-Ring Seal  Before assembly, lubricate the bore lightly with clean engine oil. 
127-5400 Bushing  After assembly, bore for auxiliary drive shaft is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).
Diameter of new auxiliary drive shaft (not shown) is 74.900 ± 0.015 mm (2.9488 ± 0.0006 inch).
Installation depth of the bushing in the water pump housing is 1.5 ± 0.5 mm (0.06 ± 0.02 inch)
9M-3786 O-Ring Seal  Before assembly, lubricate the bore with clean engine oil, glycerin, or clean water. 

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