HEAD AS-CYL -UTN 0R4883 - Caterpillar

1. Remove four bolts (1) and remove cover (2).
The adjuster cylinder for the track is under high hydraulic pressure. Do not visually inspect the relief valve to see if grease is released when it is open. Look to see that the track has loosened. Use this warning any time the tracks are loosened or tightened.
2. Loosen the track as follows:a. Turn the relief valve (2) one turn counterclockwise to permit grease to be released from the vent hole below the relief valve. If the track does not loosen, go to Step b.b. Turn fill valve one turn counterclockwise to permit grease to be released from the vent hole below the fill valve. If the track still does not loosen, start the machine and move it forward and backward. If grease is still not released, go to Step c.c. Install a slug that is 76.2 mm (3 in) in diameter 63.5 mm (2.5 in) long between the track and sprocket segment. Move the machine to the rear so the track will be pushed up by the bar. This will put tension on the track and move the front idler and track adjuster to the rear against the force of the recoil spring. This will push grease out of the vent holes. 3. Lift the machine until the track rollers are off the track. Put wood blocks under the machine. 4. Remove four bolts and lockwashers (4). Remove track roller (5). Weight is 34 kg (75 lbs) using tooling (A). The following steps are for installation of track rollers.
Remove all paint from the surfaces of the track roller and track roller frame that make contact. If there is paint between the track roller and track roller frame, the bolts that hold the track roller in place can loosen.
5. Put track roller (5) in position using tool (A). Install the bolts and lock washers that hold the roller in position. For rollers that use 5/8 inch bolts, tighten the bolts to a torque of 270 25 N m (199 18 lb ft). For rollers that use 1/2 inch bolts, tighten the bolts to a torque of 135 5 N m (100 4 lb ft).6. Remove tooling (A) or wood blocks from under the machine.7 Make an adjustment to the track. See the Topic, Track Adjustment.8. Put cover (2) in position and install bolts (1) that hold it in position.Disassemble Track Rollers
Start By:a. remove track rollers 1. Use a hammer and punch to drive the plug out of stopper (2). Removal of the plug and stopper (2) requires damaging stopper (2).2. Use a slow speed drill and 12.7 mm (.50 in.) drill bit to remove stopper (2) from the shaft.3. Remove bolts (3) and retainer (1) from both sides of the track roller. 4. Remove O-ring seal (5) from retainer (1). If the Duo-Cone seals are to be reused, put identification marks on the seals to assure that they are installed in their original positions.5. Remove seals