RIM A. 2D2569 - Caterpillar

The boom can fall if a control is moved or if a hydraulic component fails. This can cause personal injury or death. Support the boom with stands. Do not rely on the cylinder to hold the boom up.
Illustration 1 g00569909
Raise the boom to the horizontal position and fully extend the boom. Install a suitable stand under the first section in order to prevent the boom from falling unexpectedly. Do not support the second and third sections. Stop the engine.
Illustration 2 g00721670
Measure clearances (1) between the wear pads and the side of the boom sections at each side.
Measure clearances (2) between the wear pads and the top of the boom sections.
Illustration 3 g00658212
Raise the boom and remove the stand. Fully retract the boom and support the boom in the horizontal position. In order to support the boom, install a stand under the third section or cribbing under the quick coupler.
Illustration 4 g00658214
Remove the cover from the rear of the boom and measure clearances (3) between the rear wear pads and the side of the boom sections at each side.
Measure clearances (4) between the rear wear pads and the top of the boom sections.
The clearance at each location must not exceed 3 mm (0.12 inch). If the clearances are excessive, adjustments must be made. Adjustment
It is necessary to remove the plastic chain and the enclosed rolling hoses in order to perform the necessary adjustments to the boom wear pads. Refer to Disassembly and Assembly, RENR3437, "Machine Systems" for additional information.Note: The bolts that secure different wear pads are not identical lengths. Do not mix the bolts.
Illustration 5 g00658668
Loosen bolts (5) that secure the rear top wear pads. Install sufficient shims in order to reduce the clearance to 0.75 mm (0.030 inch). Tighten the bolts to a torque of 70 N m (52 lb ft).
Remove bolts (6) that secure the rear side wear pads. Install sufficient shims in order to reduce the clearance to 0.75 mm (0.030 inch) at each side. Install sufficient shims in order to produce an equal clearance between the boom sections at each side. It may be necessary to install more shims at one side than the other side. Tighten the bolts to a torque of 70 N m (52 lb ft).
Illustration 6 g00658669
Raise the boom sufficiently above the stand. Fully extend the boom and lower the boom to the horizontal position. Support the boom under the third section.
Illustration 7 g00658672
Remove bolts (7) that secure the bottom wear pads. Install sufficient shims in order to reduce the clearance to 0.75 mm (0.030 inch). Tighten the bolts to a torque of 70 N m (52 lb ft).
Remove bolts (8) that secure the side wear pads. Install sufficient shims in order to reduce the clearance to 0.75 mm (0.030 inch) at each side. Install sufficient shims in order to produce an equal clearance between the wear pads and the boom sections at each side. It may be necessary to install more shims at one side than the other side. Tighten the bolts to a torque of