CORE AS 1188629 - Caterpillar

Procedure To Measure And Adjust Belt Tension
Spring force can cause personal injury or death. See your Caterpillar dealer for disassembly instructions.
Measure The Cylinder Extension1. Check and make sure that idlers and bogie suspension springs are correctly inflated.2. Clean the undercarriage. Move the machine forward and allow it to stop without using the brake pedal.3. Stop the engine. Move the transmission control lever to NEUTRAL and engage the parking brake.4. Measure the length of the tensioner cylinder from the centerline of one pin hole to the centerline of the other pin hole to get Dimension (A). Dimension (A) should be 1243 11 mm (48.94 .43 in). Check dimension (A) on both cylinders.5. If dimension (A) is not correct, record them for later use and perform the Procedure to Adjust Belt Tension. When dimension (A) (tension cylinder pin to pin dimension) is 1243 mm (48.94 in), dimension (B) (cylinder rod extension) should be 130 mm (5.12 in). Dimension (B) may be used to measure and adjust belt tension, but the use of dimension (A) will give a more accurate adjustment. Adjust Belt Tension This procedure uses the machine hydraulics to relieve the belt tensioning. An auxiliary pump, such as the Caterpillar service press, can be used. If an auxiliary pump is used, the procedure of extending both cylinders at the same time should still be followed.1. Remove lock assembly (1).2. Slowly loosen the head end of the hose that runs from the head end to the rod end of the each cylinder. After any pressure has been released, remove the head end of the hose from both cylinders. Place the head end of the hoses in a suitable container to catch any oil.3. Remove the elbow and seal from both cylinders.4. Install the FT2228 Hose Assembly. Connect the adapters to the tensioner cylinders. Connect the 2.4 m (8 ft) hose between the adapters at the tensioner cylinders and connect the 8.8 m (29 ft) hose to the No. 1 RAISE implement quick disconnect coupler at the rear of the machine.
DO NOT exceed a maximum pressure of 11 000 kPa (1600 psi) when pressurizing the belt tensioner cylinders or machine damage can result. When pressurizing the belt tensioner cylinders, extend the cylinders only far enough to install lock assemblies (1).
5. Start the engine. Using the implement control lever that corresponds to the implement line coupler connected in Step 4, slowly pressurize and extend both tensioner cylinders. Extend the cylinders only far enough to install lock assembly (1).6. Position a lock assembly over each cylinder rod and secure with the bolts provided.7. Use the implement control lever to slowly vent the hydraulic pressure from the belt tensioner cylinders.8. Position a floor jack under the tensioner cylinder and remove bolt (2) and retainer pin (3). Lower the rod end of the tensioner cylinder.9. Remove six bolts (not shown), bracket (5), and shims (4) from the front axle.10. Remove or add shims (4) to bring dimension (A) within tolerance. Dimension (A)