CYLINDER GP-TILT 3596691 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.Problem
On certain 623H Wheel Tractor-Scrapers, the initial elevator chain slack is not sufficient, causing early hour failures of the lower 215-4459 Elevator Chain Roller Gp .Solution
The elevator assemblies are being built at the factory with an extra 3G-3393 Offset Link Assembly in each of the chains. The extra offset link assembly will lengthen and correct the chain slack and is effective with the following machines:
623H (S/N: EJD106-UP; DBF140-UP)Special attention will be required the first time the chain tension is adjusted on the elevator assembly.As the chain stretches with use of the elevator over time, the extra 3G-3393 Offset Link Assembly will need removed. The slack adjustment idlers will also need adjusted to provide the necessary slack adjustment. Refer to Operation and Maintenance Manual, SEBU8493, "Elevator Chain - Inspect/Adjust" and Operation and Maintenance Manual, SEBU8474, "Elevator Chain - Inspect/Adjust".
Illustration 1 g03370320
If the elevator assembly is outfitted with new parts: sprockets, rollers, and chains, then the chain slack may again be too tight. This requires 3G-3393 Offset Link Assemblies to be installed in each elevator chain to lengthen them in order to achieve adequate chain slack.