HARNESS AS-REAR CHASSIS 1792187 - Caterpillar

Procedure to Measure and Adjust Belt Tension
Spring force can cause personal injury or death. Contact your Caterpillar dealer for disassembly instructions.
Measure Cylinder Extension
1. Check and make sure that 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 retainer pin hole to the centerline of the other retainer pin hole to get dimension (A). Dimension (A) should be 1238.0 11.0 mm (48.74 .43 in). Check dimension (A) on both cylinders.5. If dimension (A) is not correct, record them for later use and perform Procedure to Adjust Belt Tension. When dimension (A) (tension cylinder pin to pin dimension) is 1238.0 11.0 mm (48.74 .43 in), dimension (B) (cylinder rod extension) should be 143 mm (5.63 in). Dimension (B) may be used to measure and adjust belt tension, but the use of dimension (A) gives 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 the 4T-4273 Relief Valve Group (slowly, to relieve any pressure within the cylinder) from both cylinders.2. Install one 6L-9952 Adapter with one 3D-2824 Seal to each tensioner cylinder. Install FT2228 Hose Group. Connect the 2.4 m (8 ft) hose between the adapters at the tensioner cylinders. Connect the 8.8 m (29 ft) hose to the No. 1 RAISE implement quick disconnect coupler at the rear of the tractor.
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 locks and bolts (3).
3. Start the engine. Using the implement control lever that corresponds to the implement line coupler connected in Step 2, slowly pressurize and extend both tensioner cylinders. Extend the tensioner cylinder only far enough to install locks and bolts (3). The 9U-4270 Lock and two 8T-9379 Bolts are available from parts service.4. Position locks and bolts (3) over the cylinder rods and secure.5. Use the implement control lever to slowly vent the hydraulic pressure from the belt tensioner cylinder.6. Position a floor jack under the tensioner cylinder and remove bolt (2) and retainer pin (1). Lower the rod end of the tensioner cylinder.7. Remove six bolts (not shown), bracket (5), and shims (4) from the front axle.8. Remove or add shims (4) to bring dimension (A) within tolerance. Dimension (A) is the measured distance from pin centerline to pin centerline and is 1238.0 11.0 mm (48.74 .43 in). Each shim is 3 mm (.120 in) thick. Add shims to reduce dimension