216B3, 226B3, 236B3, 242B3 and 252B3 Skid Steer Loaders, 247B3 and 257B3 Multi Terrain Loaders and 259B3 Compact Track Loader Sprocket - Inspect Caterpillar

Note: Operating the machine in conditions that are muddy or sandy will cause accelerated wear on the sprocket and other undercarriage components. Clean the undercarriage of the machine daily in order to maximize component life.

Sprocket Inspection for 247B3 and 257B3

Note: Sleeves that do not meet the minimum thickness or sleeves that do not turn freely may cause unnecessary wear on the drive lugs on the rubber track.

Remove the Sprocket

Illustration 1	g01394413
(1) Drive motor (2) Bolts and washers (3) Sprocket assembly

Note: In order to service the sprocket, the tracks must be loosened. Refer to Operation and Maintenance Manual, "Track (Rubber) - Inspect/Adjust" for the procedure.

1. Remove the 12 bolts and the 12 washers that hold the sprocket assembly to the drive motor.

2. Slide the sprocket assembly off the drive motor.

Sleeves and Rings

Illustration 2	g01394415
(4) Sprocket mounting ring (5) Washers and Locknuts (6) Outer sleeve (7) Inner sleeve

The sprocket is equipped with two types of sleeves.

• Inner Sleeves (6)

• Outer sleeves (5)

The outer sleeves are free to rotate on the inner sleeves . The sleeves are held in position by the sprocket mounting ring.

Note: There are many parts in the sprocket assembly. Remove the sprocket completely from the machine in order to work on the sprocket. Use a clean, flat surface in order to disassemble the sprocket and assemble the sprocket.

1. Remove the 12 locknuts and washers that hold the sprocket mounting ring in place.

2. Remove the ring.

3. Remove the outer sleeves and the inner sleeves.

4. Measure thickness (A) for the outer sleeves. If the thickness of the outer sleeves measures less than 3 mm (0.12 inch), replace the sleeves. Sleeves that do not meet the minimum thickness or sleeves that do not turn freely may cause unnecessary wear on the drive lugs on the rubber track.

5. When you replace the outer sleeves, rotate the inner sleeves for 180°. If the inner sleeves have already been rotated, replace the inner sleeves.

6. Repeat steps 2 through 5 for each set of sleeves.

7. The sprocket mounting rings of the drive sprocket will wear from the rotation of the outer sleeves. Measure the thickness of the inner rings and outer rings. If the thickness of the inner ring or outer ring measures less than 4.75 mm (0.19 inch), replace the ring.

8. Install the sleeves and the rings.

9. Install the new locknuts. Do not reuse the locknuts. Tighten the locknuts to a torque of 70 ± 5 N·m (51.6 ± 3.7 lb ft) in a star pattern. Turn the nuts an additional 120 degrees ±5 degrees in the same star pattern.

10. Install the sprocket on the drive motor. Tighten the bolts to a torque of 270 ± 40 N·m (199 ± 30 lb ft).

Track

Tighten the track to the proper tension. Refer to Operation and Maintenance Manual, "Track (Rubber) - Inspect/Adjust" for the procedure.

Sprocket Inspection for 259B3

Inspect

Show/hide table

Illustration 3	g02789983

1. Measure the sprocket teeth in three places as shown in illustration 3.

2. Calculate the average of the 3 measurements to determine the 50% wear limit.

3. If the average of 3 measurements is less than 178 mm (7 inch), relocate the sprocket to the opposite side of the machine. Follow the steps in the “Relocate” section. If the average of 3 measurements is less than 165 mm (6.5 inch), then replace the sprocket. Follow the steps in the “Replace” section.

Relocate

1. Remove the track on both sides of the machine.

2. Remove the sprocket on the left side of the machine. Move the sprocket to the right side.

3. Remove the sprocket on the right side of the machine. Move the sprocket to the left side.

4. Install the sprockets. Tighten the bolts to the proper torque.

5. Install the track on both sides of the machine.

Replace

1. Remove the track on both sides of the machine.

2. Remove the sprocket on the left side of the machine. Install the new sprocket.

3. Tighten the bolts to the proper torque.

4. Remove the sprocket on the right side of the machine. Install the new sprocket.

5. Tighten the bolts to the proper torque.

6. Install the track on both sides of the machine.