HOSE BK 4568522 - Caterpillar

Remove Front Idlers
start by:a) separation of track 1. Loosen bolts (1) and (2) on both sides of front idler.2. Remove four bolts (3) from the arm.3. Pull the front idler forward and remove two spacers (4).4. Fasten a hoist to the front idler. Remove the front idler (5). The weight of the front idler is 200 lb. (90 kg). 5. Remove the plates (6) and plate assemblies from the right hand and left hand bearings.Install Front Idlers
1. Install the plate assembly (2) on the front idler. Fasten a hoist to the front idler. Put the front idler (1) in position on the track roller frame. 2. Install the spacers (3) between the arm and front idler. Install the four bolts that hold them. 3. Use a hammer and hit lock pin bolt (5) until the lock pin makes a seat in the correct position. Tighten the bolt to a torque of 50 10 lb.ft. (70 14 N m).4. Tighten bolts (4) and (7).5. Put the plates (8) and shims (6) in position on the front idler. Install the bolts and tighten to a torque of 90 10 lb.ft. (120 14 N m). Check the clearance between the plates and the track roller frame with a thickness gauge. The clearance must be .060 in. (1.52 mm). Add or remove shims to get the correct clearance.Disassemble Front Idlers
start by:a) remove front idlers 1. Remove bolt and washer (1) from lock. 2. Install a 7/16-14 NC bolt (2) two inches long in the lock. Hit the bolt with a hammer to remove the lock from the bearing (3). 3. Use tooling (A) to remove the bearing from the shaft. 4. Remove the Duo-Cone seal (4) from the bearing and the bushing. Put identification on the seals so they will not be mixed at assembly.5. Do the procedure in Steps 1 through 4 again on the opposite side of the front idler.6. Remove the bolts that hold the bushings to the front idler. 7. Remove the shaft (5) and bushings from the front idler with a press. Remove the O-ring seals from the shaft. 8. Remove bushing (6) from bushing (8) with a press.9. Cut pins (7) off even with the face of the bushings. Make the surface of the bushings smooth with a file.Assemble Front Idlers
1. Install bushing (1) in bushing (3) as follows: a) Put the oil holes in the bushings in alignment. Install bushing (1) into bushing (3) with a press.b) Drill two .297 in. (7.54 mm) holes 180° apart .75 in. (19.05 mm) deep through bushings (1) and into bushings (3). Do not drill the holes through the lubrication grooves on bushing (1).c) Install two new pins (2) in each bushing even with the surface of bushing (1).2. Install the O-ring seals on the bushings. 3. Install one of the bushings (4) in the idler with tooling (A) and a press. Install the bolts in the bushing. 4. Turn the idler over. Install shaft