LINER 3312081 - Caterpillar

Illustration 1.
Typical pinion wear pattern expected with proper circle adjustment. Refer to Table 1 for callout identification.
Illustration 2.
Typical improper pinion wear pattern. Refer to Table 1 for callout identification.Circle adjustment is made, as needed, based on application. If the circle is frequently cycled under load, the circle shoe wear strips will wear at a faster rate. Therefore, the need to adjust the circle will be more frequent.
It is important to keep the circle shoes in contact with the circle at all times.Work environment and experience should be considered when choosing a lubricant. There are examples of successful use of grease, dry film lubricant or nothing at all. If frequently cycling under load, grease is the preferred lubricant. Caterpillar recommends a lubricant be used every 10 hours or daily. Before clean lubricant is applied, the circle drive pinion teeth should be cleaned of dirt and old lubricant.
With the exception of the 24H Motor Graders, Caterpillar now uses nonmetallic wear strips in production of all of the Motor Grader's circle assemblies. With the use of the nonmetallic material, the circle may be adjusted tighter and turn easier. Both metallic and nonmetallic wear strips are serviced. Refer to Service Magazine articles dated March 10, 1997 and August 3,1998 that are referenced above
Circle Adjustment Procedure:
It is now recommended that all of the circle shoes (front, side and rear) are set to contact the circle. This will remove the 0.76 to 2.00 mm (.030 to .079 inch) clearance between the circle shoes and the circle.
1. Refer to Table 2 to set the circle (Item 5) and pinion (Item 6) to dimension (A) shown in Illustration 3.2. Holding the dimension between the circle and pinion, place the front shoes in contact with the circle and adjust the set screws.3. Tighten the nuts while holding the set screws.4. While the front shoes are in contact with the circle, adjust the set screws on the remaining shoes to contact the circle.5. Tighten the remaining nuts while holding the set screws.6. Refer to the appropriate Specifications referenced above for the proper torque.
Illustration 3.
Typical circle (Item 5) and pinion (Item 6). Refer to Table 2 for Dimension (A).