Installing the 299-3915 Sprocket Kit (ARC) and the 299-3916 Sprocket Kit (XR){4062, 4164} Caterpillar

Skid Steer Loader:

236B (S/N: HEN4827-6749,6750-UP)

236B2 (S/N: HEN4827-6749,6750-UP)

236B3 (S/N: A9H1-UP)

246B (S/N: PAT4409-UP)

248B (S/N: SCL3243-UP)

252B (S/N: SCP3932-4599,4600-UP)

252B2 (S/N: SCP3932-4599,4600-UP)

252B3 (S/N: TNK1-UP)

262B (S/N: PDT1684-UP)

268B (S/N: LBA1658-UP)

Introduction

Reference Disassembly and Assembly, RENR4864, "236B, 236B2, 263B3, 246B, 252B, 252B2, 252B3, and 262B Skid Steer Loaders Power Train"

Reference Disassembly and Assembly, RENR8744, "248B and 268B Skid Steer Loaders "

This special instruction provides the procedures for installing the 299-3915 Sprocket Kit (ARC) on 236B, 246B, and 248B machines and for installing the 299-3916 Sprocket Kit (XR) on 252B, 262B, and 268B machines. These kits contain double sprockets for replacing the current motor sprockets and the current rear axle sprockets. The double sprockets enable reconfiguration of the drive chains in order to provide full power to the rear axles. This is desired for machines that are converted from tires to Versatile Track System (VTS) suspended rubber tracks.

As an overview of this instruction, the front axle sprockets, the rear axle sprockets, and the motor sprockets must be removed. In order to remove the axle sprockets, the front axles, the rear axles, and the drive chains must be removed. The drive motors must be partially removed in order to remove the axle sprockets from the machine. Double sprockets are then installed on the rear axles and on the drive motors in order to accommodate both of the drive chains. The current sprockets must be reinstalled with the front axles.

Read this entire publication. Do not perform any procedure until you understand the information that is contained in this publication.

Kit Parts

Installation Instructions

Illustration 1	g01327215
Current configuration for drive groups (A) Bolt (B) Hard Washer (C) Hard Washer (D) Axle Sprocket (E) Chain (F) Bolt (G) Retainer (H) Motor Sprocket (J) Spacer

Illustration 2	g01328131
(R) Plate (S) Bolt (T) Hard Washer (U) Axle (V) Nut (W) Washer

Illustration 3	g01328182
(X) Cover (Y) Bolt (Z) Hard Washer

Note: The Disassembly and Assembly Manual for your machine contains procedures for removal and installation of major components. Becoming familiar with the following procedures should aid you in the installation of these kits.

• Disassembly and Assembly, "Axle - Remove"

• Disassembly and Assembly, "Axle - Install"

• Disassembly and Assembly, "Piston Motor (Hydrostatic) - Remove"

• Disassembly and Assembly, "Piston Motor (Hydrostatic) - Install"

• Disassembly and Assembly, "Chain (Drive) - Remove"

• Disassembly and Assembly, "Chain (Drive) - Install"

• Disassembly and Assembly, "Chain (Drive) - Adjust"

1. Perform the procedure "Axles - Remove" in the Disassembly and Assembly manual for your machine in order to remove the following parts.

   Note: The weight of the axle assembly is approximately 37 kg (82 lb). Use a suitable lifting device for supporting the weight of the axle assembly.

   Refer to Illustration 1, Illustration 2, and Illustration 3.

   • Bolts (S), hard washers (T), and plate (R)

   • Bolts (Y), hard washers (Z), and covers (X)

   • Nuts (V), washers (W), and axles (U)

   • Bolts (A), hard washers (B), hard washers (C), and sprockets (D)

   • Drive chains (E)

   Note: Do not remove the O-ring seals from the axles.

2. Reinstall the front axle sprockets (D). Use hard washers (B), hard washers (C), and bolts (A) .

3. Remove sprocket (H) by removing bolt (F) and retainer (G). See Illustration 1.

   Note: Leave spacer (J) installed on the motor shaft.

   Discard the motor sprocket (H). Retain bolt (F) and retainer (G) for the reinstallation.

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Illustration 4	g01331204
(K) Drive motor (L) 193-8340 Bolts (M) 8T-4122 Hard Washers (N) 8T-4132 Nuts

4. Unbolt drive motor (K) by removing eight nuts (N), eight hard washers (M), and eight bolts (L). Retain nuts (N), hard washers (M), and bolts (L) for the reinstallation. See Illustration 4.

   Then, move drive motor (K) toward the inside of the machine so that the motor shaft is no longer inside the chain case.

   Note: Do not disconnect the hydraulic hoses.

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Illustration 5	g01325834
New configuration for drive groups (1) Axle Sprocket (2) Motor Sprocket (A) Bolt (B) Hard Washer (C) Hard Washer (E) Chain (F) Bolt (G) Retainer (J) Spacer

5. Install axle sprocket (1), motor sprocket (2), and drive chains (E) by performing Step 5.a through Step 5.j.

   Note: Use the 258-2761 Axle Sprocket on 236B, 246B, and 248B machines. Use the 258-2762 Axle Sprocket on 252B, 262B, and 268B machines.

   1. Compare the lengths of the two drive chains (E). The lengths should be approximately equal. If one drive chain is noticeably longer than the other drive chain, replace both drive chains with new drive chains.

   2. Place a drive chain (E) around the inboard row of teeth on rear axle sprocket (1). See Illustration 5.

   3. Position axle sprocket (1) with drive chain (E) next to the opening to the chain case. Position the remainder of drive chain (E) to the front of the sprocket.

   4. Feed the remainder of drive chain E forward into the chain case. At the same time, maneuver axle sprocket (1) with drive chain (E) into the chain case. Push axle sprocket (1) and drive chain (E) inboard against the wall of the chain case.

   5. Place the second drive chain (E) inside the chain case onto the outboard row of teeth on axle sprocket (1). Position the remainder of drive chain (E) to the front of the sprocket.

   6. Slide axle sprocket (1) and drive chains (E) to the rear of the chain case until axle sprocket (1) is aligned for fitup to the axle.

   7. Place the axle in position so that axle sprocket (1) is inserted onto the axle shaft.

      Note: Check that the 5P-3092 O-Ring Seal is in position on the axle before reinstalling the axle.

      Loosely install the eight axle nuts and the eight hard washers in order to hold the axle in position.

      Install bolt (A), hard washer (B), and hard washer (C) in order to secure axle sprocket (1) on the axle shaft.

   8. Place motor sprocket (2) into the chain case. Position drive chains (E) onto the sprocket's teeth.

   9. Place drive motor (K) in position so that motor sprocket (2) is inserted onto the shaft.

      Note: Remove any gasket material that remains on the mating surfaces. Apply new silicone sealant to the mating surfaces before reinstalling the drive motor.

      Note: Check that spacer (J) is in position between the motor sprocket and the drive motor. Also, check that the spacer's chamfer is positioned toward the drive motor.

      Secure drive motor (K) with the eight 8T-4132 Nuts (N), the eight 8T-4122 Hard Washers (M), and the eight 193-8340 Bolts (L) that were retained for the reinstallation. See Illustration 4.

      Install bolt (F) and retainer (G) in order to secure motor sprocket (1) on the shaft. See Illustration 5.

   10. Tighten bolt (A) to a torque of 240 ± 40 N·m (177 ± 30 lb ft).

       Tighten bolt (F) to a torque of 100 ± 20 N·m (74 ± 15 lb ft).

6. Adjust the tension of drive chains (E) .

   Refer to "Chain (Drive) Tension- Adjust" in the Disassembly and Assembly manual for your machine.

   Note: Follow the procedure for tightening the axle nuts in "Chain (Drive) Tension- Adjust".

   Note: The tension between the two drive chains may differ slightly. However, both drive chains should be adjusted to the specification of 12.5 ± 2.5 mm (0.5 ± 0.1 inch) of total center movement on the slack side of the chain.

7. Reinstall cover plate (R). Use the ten bolts (S) and the ten hard washers (T) that were retained. See Illustration 2.

   Note: Remove any gasket material that remains on the mating surfaces. Apply new silicone sealant to the mating surfaces before reinstalling cover plate R.

8. Install the VTS suspended rubber track. Follow the manufacturer's procedure for installing the VTS.

9. Repeat the procedure for the other side of the machine.

   Note: In order to again use tires, the inboard drive chains must be repositioned from the rear axle sprockets to the front axle sprockets.

Appendix

Referenced Parts