CONTROL GP-UNPROGRAMMED 2115228 - Caterpillar

Illustration 27 g01142493
Remove adjustment shim (18) from each side of each idler. This is done for the front idlers and the rear idlers at 50% undercarriage wear.
Center Tread Idlers are mounted slightly higher when new undercarriage is installed, increasing the initial grouser rise height.
An idler height adjustment shim (18) must be removed at approximately 50% undercarriage wear. This increases grouser rise height by raising the Center Tread Idlers back up, halfway through the undercarriage life.Note: Factor 2 above is the only interim maintenance required for SystemOne with Center Tread Idlers. It is critical for this height adjustment shim to be removed (at approximately 50% SystemOne undercarriage wear). This will maintain proper idler rise height and will avoid tractor ride problems.As discussed previously, Center Tread Idlers will generally wear through 2 to 3 SystemOne undercarriages. However, CTI sealing and lubrication compartment is designed to be serviced/renewed at SystemOne undercarriage replacement. The individual parts of the Center Tread Idler are parts serviced. Therefore, it is imperative that Center Tread Idlers be resealed and lubricated when the SystemOne undercarriage is replaced. This is also a good time to swap the Center Tread Idlers from front to rear, and from right side to left side. This will help even out any :
Front to rear idler wear differences
Inner vs outer side flange wear differencesAs with conventional idlers, Center Tread Idlers can be weld rebuilt when worn to the wear limit. However, with the extended life of these idlers (two to three undercarriages), hub and/or idler sidewall wear may be the limiting life factor. The requirement for idler weld rebuild be much lower.Conventional Idler
Wear Characteristics
As discussed previously, conventional idlers used with a SystemOne undercarriage must be the improved, latest version (improved tread) idlers. These idlers are designed with more tread wear material to have balanced wear life with SystemOne track. Also, the center flange is taller for improved SystemOne track guiding. The latest version idlers also have a wider tread to accommodate the wider SystemOne track. Also, these idlers have the latest version, symmetrical Duo-cone seals for superior sealing. Service Magazine 12 August and IRM UC02-11, PELJ1079 give additional details on the improved, latest version conventional idlers. This information is also listed in Section ""SystemOne Literature Reference"".Wear characteristics for conventional idlers with a SystemOne track will be similar to a conventional track, including tread wear patterns. Heavy side sloping and turning will increase idler center flange wear, just as with conventional track. Wear limits for conventional idlers are the same when used with SystemOne track. A wider outside link assembly spread has been designed into the SystemOne track. Because of this, the SystemOne links may slightly overhang conventional idler treads. This is cosmetic only, and does not affect the idler function or track function. Good Custom Track Service (CTS) inspections and recommendations are essential in maximizing SystemOne undercarriage life. Current CTS wear charts are used for D4H improved conventional idlers, and are in the 15th Edition CTS Handbook and in software program CTS 5.5.Serviceability
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