Usage:
789B (2BW),
793B (1HL),
793C (4AR, 4GZ) OFF-HIGHWAY TRUCKS
Problem:
From June 1996 through May 1998, 106-1801 Rear Suspension Cylinder Groups and 106-3722 Rear Suspension Cylinder Groups were produced using an incorrect dimensional design change. The bore for the rod eye bearing and the bore for the cylinder eye bearing were incorrectly machined to a diameter of 203.19 ± 0.05 mm (8.000 ± .002 in). Previously the bores were machined to a diameter of 203.12 ± 0.05 mm (7.997 ± .002 in).
Some machines, equipped with rear suspension cylinders that have oversize eye bearing bores, have experienced failure due to the eye bearings spinning in the oversized bores.
The design change was corrected and the previous dimension, 203.12 ± 0.05 mm (7.997 ± .002 in), went back into effect for 106-1801 Rear Suspension Cylinder Groups and 106-3722 Rear Suspension Cylinder Groups produced after the beginning of May 1998. However, it is suspected that remanufactured rod assemblies and remanufactured cylinder assemblies were not machined to the corrected design change dimension until April, 1999.
Solution:
Rear suspension cylinder groups and components that are in inventory should be inspected before use. It is necessary to measure the eye bearing bores of both new and Reman cylinder groups and components. Refer to the chart for the part numbers of affected cylinder groups and components. If the eye bearing bore is not within the specification, do not install the suspension cylinder on the machine. Remove the rod and/or cylinder assembly from usable inventory. Either rework the component to the correct dimension, or return the component to Caterpillar, including an explanation for the cause for rejection.
Typical Rear Suspension Cylinder
COPYRIGHT 1999 CATERPILLAR ALL RIGHTS RESERVED