2003/01/06 Caterpillar

Improved Fan Drive Groups Include Components That Help Retain The Axial Force On The Fan Drive Bearings {1359}

Usage:

793B 1HL

Engines: 3512 (S/N: 5EL; 6FL) 3516 (S/N: 6CL; 7CL)
Off-Highway Truck/Tractor: 784B (S/N: 5RK) 784C (S/N: 2PZ) 785 (S/N: 8GB) 785B (S/N: 6HK) 785C (S/N: 1HW; APX; 5AZ) 789 (S/N: 9ZC) 789B (S/N: 7EK) 789C (S/N: 2BW) 793 (S/N: 3SJ) 793B (S/N: 1HL) 793C (S/N: 4AR; ATY; 4GZ)
Wheel Loader: 994 (S/N: 9YF) 994D (S/N: 3TZ)

Service Magazine SEPD0660, 16 December 2002, "Improved Fan Drive Groups Include Components That Help Retain The Axial Force On The Fan Drive Bearings". Disregard this article. The correct information follows.

Description of Change: The fan drive groups that are identified in Table 1 are used on the above machines. These fan drive groups have been improved in order to help retain the axial force on fan drive bearings. This will help prevent the bolts that retain the fan drive bearings from loosening.

Adaptable To: Illustration 1 and Table 2 identify the new components and former components in the fan drive groups that are identified in Table 1.

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Table 1
Improved Fan Drive Groups ⁽¹⁾
Part Number	Description
7W-7285	Fan Drive Gp
9Y-8897	Fan Drive Gp
102-9792	Fan Drive Gp
107-0784	Fan Drive Gp
107-8707	Fan Drive Gp
172-0220	Fan Drive Gp
178-6384	Fan Drive Gp
0R-4437	Remanufactured Fan Drive Gp
0R-4438	Remanufactured Fan Drive Gp
0R-4439	Remanufactured Fan Drive Gp

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The fan drive groups are not available for parts service at the group level.

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Illustration 1	g00926887
This illustration shows the locations of the changed components in a typical fan drive group. (A) Plug (B) Fan Adapter (X) The minimum distance between the face of the Fan Adapter (B) and the face of the Plug (A) is 44.0 mm (1.73 inch).

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Table 2
New Components In Fan Drive Groups
Item	Qty	New Part Number	Description	Former Part Number
1	1	217-6918	Bracket Assembly	9Y-9397
2	1	209-5296	Spacer	7E-2456
3	-	217-6917	Shaft ⁽¹⁾	113-8158
4	1	217-6916	Retaining Washer	113-8159
5	2	7E-4202	Washer	2M-0849
6	2	7K-4370	Bolt	7X-3325

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The Shaft is a component of the Bracket Assembly.

The new components that are identified in Table 2 are effective with the Off-Highway Trucks that follow: 785C (S/N: APX333-UP; 5AZ274-UP), 789C (S/N: 2BW567-UP) and 793C (S/N: ATY520-UP).

The former 113-8158 Shaft and the former 113-8159 Retaining Washer can be modified and used. See the Modification Procedure that follows.

Modification Procedure

Check the Dimension (X) that is identified in Illustration 1. If the distance is less then the minimum, the bolts (6) may contact the Plug (A). In order to increase the Dimension (X), remove the Plug (A) from the Fan Adapter (B). Tap the hole in the Fan Adapter with additional threads. The additional threads will allow the Plug to be installed farther into the Fan Adapter. This will increase the distance between the Plug (A) and the bolts (6).

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Illustration 2	g00927084
113-8159 Retaining Washer The diameter of two holes (A) must be enlarged to 17.0 mm (0.67 inch).

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Illustration 3	g00927161
113-8158 Shaft The two threaded holes (B) must be drilled to a diameter of 13.8 mm (0.54 inch) and a depth of 32 mm (1.26 inch). The two holes (B) must be tapped with 5/8 - 11 thread.