BUSHING ASSEM. 1F8873 - Caterpillar

Illustration 1
Track In Full Tight Position
Never visually inspect the vent holes or valves to see if grease or oil is coming out of them. Make sure the vent holes are clean before the tension is released on the track. Watch the cylinder to see that it moves.
(1) (2) Torque for the valves 35 7 N m (25 5 lb. ft.)Do not make a track adjustment if the dimension (A) between the rear face of the yoke and the front face of the cylinder flange is more than the maximum permissible distance. (See the following chart for specific machine.)
Illustration 2
Front Idler Moved Back
Illustration 3
Correct Track AdjustmentFor correct track adjustment, use the procedure that follows: The track adjustment procedure should be performed under the same conditions in which the machine is used. Packing must NOT be removed from the track, if packing conditions exist on the job.1. Move the machine forward a distance of twice its length. Allow the machine to come to a stop without the use of the brakes.2. Use the hydraulic track adjuster and move the idler forward (toward the front of the machine) until the track is in the full tight position. Make a mark (B) on the track roller frame, even with the front face of the idler bearing assembly. See ILLUSTRATION 1.3. Make a mark (C) on the track roller frame 13.0 + 0.0, - (minus) 1.5 mm (.512 + 0.000, - (minus) .059 in.) behind mark (B).4. Open the relief valve, and allow the idler to move back, until the front face of the idler bearing assembly is behind mark (C). See ILLUSTRATION 2. It is necessary to move the machine in a back and forth motion to move the idler back.Close the relief valve.5. Use the hydraulic track adjuster, and move the idler forward again, until the front face of the idler bearing assembly is even with mark (C) on the track roller frame. See ILLUSTRATION 3.