TUBE AS 4287254 - Caterpillar

1. Remove both guards (1) from the idler.2. Remove bolts (4), spacers (3), shims, guide (2) and strips from each side of the idler. Keep the shims with their respective guides to prevent a mix at assembly.3. Install a hoist on the idler as shown. 4. Remove bolts (5) from each side of the idler.5. Remove bolts (6) from each side of the idler.6. Move the idler forward until the collars are free of the track roller frame.7. Remove the front idler. Weight is 750 lb. (340 kg).Install Front Idlers
1. Fasten a hoist to the front idler (1). Put the idler in position on the track roller frame. 2. Install bolts (4) on each side of the idler.3. Install bolts (2) on each side of the idler. Shims (3) are to make the idler shaft parallel to the roller shafts and to keep the clearance between the yoke and plate assemblies at .045 .015 in. (1.14 0.38 mm). Tighten bolts (2) to a torque of 350 35 lb.ft. (474.5 47.5 N m). 4. Put guide (9) in position on each side of the idler. Install spacers (8), shims (7), bolts (6), and strips (5) on each side of the idler. Tighten bolts (6) to a torque of 350 35 lb.ft. (474.5 47.5 N m).5. Install both guards on the idler. Shims (7) are to keep dimension (B) a distance of .032 .016 in. (0.81 0.41 mm).Disassemble Front Idlers
start by: a) remove front idler 1. Remove plug (2). Remove oil from idler. Install plug to prevent dirt from getting into the shaft.2. Remove bolt (3). Remove collar (1) and shims (4).
Put identification on the shims as to their location on the idler to prevent a mix at assembly.
3. Remove bolt (5). Remove the lock that holds the bearing on the idler with a hammer and punch.4. Install tooling (A) on the bearing (6). Remove the bearing from the idler shaft. 5. Remove two Duo-Cone seals (7).
Put identification on the seals as to their location on the idler to prevent a mix at assembly.
6. Remove bolts (10).7. Follow the procedure in Steps 2 through 6 and remove the collar, shims, bearing, and Duo-Cone seals from the opposite side of the idler.8. Remove the bushing assemblies (8) and shaft (9) with a press. 9. Remove the bearings (11) from bushings (13) with a press. Cut pins (12) even with the face of the bushing. Make the face of the bushing smooth with a file.Assemble Front Idlers
1. Put the oil holes in bearing (1) in alignment with the oil holes in bushing (3). Install the bearing in the bushing with a press. Drill two .297 in. (7.54 mm) diameter holes 180° apart through the bearing and into the bushing. Drill the holes .75 in. (19.0 mm) deep.
Do not drill the holes through the lubrication grooves in the face of the bearing flange.
2. Install two new pins (2) even with the outside face of the