2007/07/23 Caterpillar

A New Sprocket Segment Improves The Retention Of The Segment {4155, 4184}

Usage:

963C 2DS

Track-Type Loader: 963C (S/N: BBD1-UP; 2DS1-UP)

Service Magazine SEPD0919, 17 December 2007, "A New Sprocket Segment Improves The Retention Of The Segment". Disregard this article. This article has been replaced by the following article.

Description of Change: A new sprocket hub and a new segment is available for the 963C Track-Type Loader. One additional bolt is added to each of the segments. The original segments used four 5/8 inch bolts per segment. The new segments use five 5/8 inch bolts per segment. Also, a new tightening procedure has been implemented. The new hub, the new segments, and the new tightening procedure will improve the retention of the segments.

Adaptable To: The new 311-8369 Hub and 308-6854 Sprocket Segments are a direct replacement for the following parts:

127-6333 Hub
197-9673 Sprocket Segments
8E-4365 Sprocket Segments
258-9797 Sprocket Segments

The new hub and the new segments are adaptable to the following machines:

963C (S/N: BBD1-UP; 2DS1-UP)

Note: The new hub and segments are not adaptable to any of the machines that have the waste handling arrangement or the transfer station arrangement. These arrangements have a special ring that is welded to the hub.

Required Parts

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Table 1
Required Parts
Item	Part Number	Description	Qty
1	308-6854	Sprocket Segment	10
2	311-8369	Hub	2
3	3S-8182	Bolt	50
4	7H-3607	Nut	50
5	178-3707	Bolt	36
6	9X-8257	Washer	36

Rework Procedure

Note: This rework procedure is divided into two parts. The first part involves the removal and disassembly of the final drive in order to replace the old hub with the new hub. The final drive is then reassembled and the final drive is then installed onto the machine. The second part of the rework involves the installation of the new segments onto the final drive hub.

Rework, Part 1

Remove the old hub and segments. Discard all parts.
ReferenceRefer to the Disassembly and Assembly, RENR5232 for the removal and disassembly of the hub and segments.

Use a wire wheel in order to remove any dirt, rust, or paint from the mounting surfaces for the new hub.

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Illustration 1	g01439391

Attach hub (2) with 18 bolts (5) and 18 washers (6), as shown in Illustration 1. Make sure that new bolts and washers are used. Torque the bolts to 300 ± 40 N·m (220 ± 30 lb ft).

Complete the reassembly of the final drive.

Reinstall the final drive onto the machine.
ReferenceRefer to the Disassembly and Assembly, RENR5232 for the assembly and installation of the final drive.

Repeat Step 1 through Step 5 for the other side of the machine.

Rework, Part 2

Use a wire wheel in order to remove any dirt, rust, or paint from the mounting surfaces for the segments and the hub.

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Illustration 2	g01442858

Each segment has two small locator pads (7) on the underside of the segment, as shown in Illustration 2.

Place segment (1) with the flange against the outside of the mounting flange for hub (2) .

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Illustration 3	g01442861

Make sure that the two locator pads (7) on each sprocket segment are on top of hub (2) .

Coat the threads of all bolts (3) and nuts (4) with 5P-3931 Anti-Seize Compound or the equivalent lubricant. Make sure that new bolts and new nuts are used.

Insert bolts (3) from the back of the hub with the head of bolts (3) against the flange of hub (2), as shown in Illustration 4.

Thread nuts (4) onto bolts (3) until nuts (4) are seated against the mounting flange of segment (1) .

Hand tighten nuts (4) .

Repeat Steps 3 through 8 until all five segments (1) are located on the final drive.

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Illustration 4	g01524171
The tightening sequence for bolts noted above.

Follow the tightening sequence in Illustration 4. Tighten nuts (4) to a torque of 55 N·m (41 lb ft) in order to seat each segment.

Follow the tightening sequence in Illustration 4. Tighten nuts (4) to a torque of 175 ± 40 N·m (130 ± 30 lb ft) in order to apply full torque to each of bolts (3) .

Follow the tightening sequence in Illustration 4. Tighten nuts (4) for an additional 1/3 turn. This will provide the final load to bolts (3) in order to ensure maximum retention of segment (1) to final drive hub (2) .