SHAFT 2W0551 - Caterpillar

Illustration 1 g01731594
(A) Adjusting shims
(B) Dimension between the height of the front idler tread and the height of the roller treadThe height of the front idler tread should always be higher than the height of the roller tread. The dimension (B) is set approximately to 25 mm (1 inch) to 37 mm (1.5 inch) at the factory. Dimension (B) decreases as the undercarriage wears. If a rebuilt idler or a new idler is installed with track rollers that are worn, dimension (B) decreases.Adjustment of the front idler to the correct height can improve the ride of the tractor and the performance of the dozer. Use the following procedures to determine the best operating position.If the machine is operated on FIRM UNDERFOOT conditions and excess vibration occurs, shims can be added under the bogie pads to raise the front idler. Also, the adding of shims under the bogie pads lower the rollers.If the machine is operated in SOFT UNDERFOOT conditions, shims can be removed under the bogie pads to raise the rollers. Also, the removal of shims under the bogie pads lowers the idlers. Lowering the front idler can improve dozing performance.If ground rippling by the dozer or excess vibration occur in soft material, shims can be installed to raise the front idler.Consult your Caterpillar dealer for detailed information about checking the idler and about adjustments to the idler.