JCB Backhoe Loader Power Side Shift – Chain Adjustment

This article provides a detailed procedure for adjusting the chain tension on a JCB Backhoe Loader Power Side Shift.

JCB Heavy Duty Truck Diagnostic Tool JCB Electronic Service Tool with JCB ServiceMaster 4 V1.73.3 or V24.05

Inspection and Adjustment

The chain tension should be checked at the first service after 100 hours and then every 500 hours.

1. Park and Secure the Machine:
   • Park the machine on firm, level ground.
   • Engage the parking brake and put the transmission in neutral.
   • Lower the loader arms to the ground.
2. Prepare the Excavator:
   • Center the carriage.
   • Place the excavator on the ground.
   • Remove the ignition key.
3. Check Chain Tension:
   • Measure the center deflection (A). It should be between 5 to 10 mm (0.19 to 0.39 inches).
   • Ensure the tension is uniform across all chains.
4. Adjust Chain Tension if Necessary:
   • Loosen lock nut (C).
   • Adjust nut (B) as needed.
   • Tighten lock nut (C).
5. Repeat for Other Chains:
   • Perform steps 3 and 4 for the other pair of chains.

   Note: If there are no adjustment threads left, new chains must be installed.

6. Final Check:
   • Move the carriage side to side several times.
   • Recheck the deflection to ensure proper tension.

Removal and Installation of Chains

If chain replacement is required, follow these steps:

Removal

1. Park and Secure the Machine:
   • Park the machine on a firm, level surface.
   • Engage the parking brake and place the transmission in neutral.
   • Lower the loading arm to the ground.
2. Prepare the Excavator:
   • Center the loading wagon.
   • Place the excavator on the ground.
   • Remove the ignition key.
3. Remove the Chain:
   • Loosen and remove nut (B).
   • Remove cotter pin (D) and pin (E).
   • Pull the chain off the machine.

Assembly

1. Thread the Chain:
   • Thread the chain onto the pulleys.
   • Attach it to the carriage with pin (E).
   • Insert a new cotter pin (D).
2. Adjust the Chain Tension:
   • Attach the chain tensioner.
   • Tension the chain as necessary (refer to the “Inspection and Adjustment” section).

By following these steps, you can ensure proper chain tension and maintenance of the JCB Backhoe Loader Power Side Shift, enhancing the machine’s performance and longevity.