WASHER 2G3674 - Caterpillar

Track Roller Frames
Illustration 1 g03720946
(1) Single flange track rollers (2) Access panel (3) Track roller frame (4) Track carrier roller (5) Idler (6) Double flange track rollersThe two track roller frames are mirror images of each other. A front idler (5) and two carrier rollers (4) are fastened to each track roller frame (3). The access panels (2) for the recoil cylinder and the mechanism for track adjustment are located between the pivot shaft and the equalizer bar. The standard undercarriage has seven track rollers. Four of the rollers are single flange track rollers (1) and three of the rollers are double flange track rollers (6). The installation of the track rollers is arranged from the front of the machine in the following order:
Single flange
Double flange
Single flange
Double flange
Single flange
Double flange
Single flangeThe LGP arrangement has eight track rollers. The installation of the track rollers is arranged from the front of the machine in the following order:
Single flange
Double flange
Single flange
Double flange
Double flange
Single flange
Double flange
Single flange
Illustration 2 g03721059
(7) Idler assembly (8) Wear plates (9) Track adjusting cylinder (10) Burst fuse (11) Nitrogen cylinder (12) Nitrogen fill/relief valve (13) Grease fill/relief valveEach track roller frame has a track adjusting cylinder (9) that is filled with multipurpose grease or oil. When grease or oil is added through grease fill/relief valve (13), the pressure pushes the track adjuster piston forward. The forward movement of the track adjuster piston tightens the track.In order to loosen the track, loosen grease fill/relief valve (13). This releases grease or oil from the chamber in the track adjuster cylinder. When the grease or oil is allowed out of the chamber, the reduction in pressure allows the track adjuster piston to move to the rear which releases the tension on the track. The grease fill/relief valve (13) can be accessed through the front access panel (2) .Each track roller frame also has a recoil cylinder that is filled with nitrogen (11). The recoil cylinder protects the undercarriage and final drive from excess loading when foreign material gets between the track and the other parts of the undercarriage. Nitrogen fill/relief valve (12) is used to change the amount of nitrogen in the cylinder. The valve can be accessed through the rear access panel (2) in the track roller frame.The following events will occur when foreign material gets between the track and the other parts of the undercarriage:
The front idler and the track adjuster piston move toward the rear of the machine.
Since the grease or oil in track adjusting cylinder (9) cannot be compressed, recoil cylinder (11) is compressed.
The compression of recoil cylinder (11) allows the debris to pass between the track and the other parts of the undercarriage without stretching the track. When the foreign material has passed through the undercarriage, recoil cylinder (11) returns to the forward position.Each track roller frame also has a burst fuse (10). The burst fuse will rupture if the force that is applied to the recoil cylinder is too large. The rupture of burst fuse (10) will