ENGINE AR 4W7477 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 439-5575 Hydraulic Jack 1
Start the engine. Park the machine on a hard, level surface. Shut off the engine.
Personal injury or death can result from grease and oil coming out of the relief valve.Grease and oil are under high pressure coming out of the relief valve and can penetrate the body.Do not watch the relief valve to see if grease is escaping. Watch the track or track adjustment cylinder to see if the track is being loosened. Make sure the vent holes are clean before the tension is released on the track.
Illustration 1 g00489342
Release the tension on the track.
Loosen relief valve (1) by one turn only. If the track does not loosen after opening the relief valve, move the machine forward and backward until the tension is released.
Illustration 2 g00693935
Loosen bolt (2) that holds track carrier roller (3) to the mounting bracket on the undercarriage.
Illustration 3 g00489356
Position Tooling (A) and suitable cribbing under the track assembly, as shown.
Use Tooling (A) to lift the track assembly off the track carrier roller.
Remove track carrier roller (3). The weight of track carrier roller (3) is 17 kg (38 lb).Reference: Refer to Undercarriage Reconditioning Bulletin, SEBF8568, "Hydraulic Excavator Roller Disassemble and Assembly Procedures" for the Disassembly and Assembly procedures for the track carrier roller.Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 439-5575 Hydraulic Jack 1
Make sure that the shaft of the track carrier roller and the bore in the mounting bracket on the undercarriage are clean and free of dirt.
Illustration 4 g00652868
(x) Mounting bracket
Place the track carrier roller in position in the mounting bracket. The weight of track carrier roller is 17 kg (38 lb). Adjust the carrier roller until Distance (a), the distance between the outside face of the mounting bracket and the carrier roller is 6.5 0.5 mm (0.28 0.02 inch).
Illustration 5 g00693935
After you adjust the position of track carrier roller (3) in the mounting bracket, tighten bolt (2).
Illustration 6 g00489356
Make sure that track carrier roller (3) rotates smoothly by manually turning the carrier roller.
Slowly lower the track assembly onto the carrier roller with Tooling (A).
Tighten the tension of the track. Refer to Operation and Maintenance Manual, "Track Adjustment - Adjust" for the correct procedure.