Usage:
AP-1055B (8BM, ABB),
BG-2455C (6TN, ACM) Asphalt Pavers
The procedure in this article will be used to correctly align the belts.
1. Raise the machine so the tracks are not contacting the ground.
2. Run the machine, in the travel mode, at full speed in the forward direction for 15 minutes to warm the belts.
3. Run the machine in 5 minute increments and adjust the alignment arm between each run until the track is at the "hard out" (2) position and then at the "hard in" position (1). Note the number of turns to the jacking bolts to reach the "hard out" and "hard in" positions.
4. If the adjustment to the "hard out" and "hard in" positions are present, perform the following steps:
a.) Position the jacking bolts to the halfway point of the two positions (half the number of turns in Step 3).
b.) Run the machine in 5 to 10 minute increments at full travel speed. Between runs take temperature differential measurements between the inside surfaces of the front two 120-7027 Idler Wheels on the metal rim (3). Adjust either of the jacking bolts in 1/8 to 1/4 turn increments until the temperature differential is less than 30°F.
c.) After the track is aligned properly, tighten two 6V8182 Nuts on threaded rod. Then run the threaded bolt against the alignment bar and torque to 40 ft. lbs. Once this is completed, tighten nut 6V8190 and torque 250 ft. lbs.
5. If adjustment to the "hard out" and "hard in" positions are not present, perform the following:
a.) Loosen both the front mounting bolt and the stub shaft mounting plate bolts.
b.) Inspect the space between the contacting face of the front axle and track frame.
c.) If a gap is present, add an adequate number of shims until the gap is eliminated and the shims are tight. Use one or a combination of the following shims: 142-0345 Shim (1/4 in), 142-0036 Shim (1/8 in), or 166-1334 Shim (1/16 in).
d.) If there is not a gap present, but the track is running at the "hard in" position, pull the frame out slightly and add one 142-0036 Shim (1/8 in).
e.) If the track is running at the "hard out" position, remove one 1/8 in worth of shims and perform Step f.
f.) Tighten both the front mounting plate bolts and the stub shaft mounting plate bolts.
g.) Run the machine after completing Steps B through E and see if the ability to adjust the track to the "hard in" and "hard out" positions is gained. If the adjustment is not gained, repeat steps A through E. ( Note: Adding too many shims may cause the frame to fall off the front axle. Make sure there is adequate contact between the milled surface of the front axle and the track frame, approximately 3/4 in. See Figure 3.) If the belt is unable to be aligned, an inspection of the track components through Step 6 may need to be performed.
h.) Align belt according to Step 4.
6.
NOTE: The following steps may be performed to correct the tracking problem, as well as other structural problems. However, these changes are preliminary and may be changed after further testing is completed.
a.) Remove the belt from the track frame.
b.) Run a string line from the middle of the drive wheel to the alignment pivot pin.
c.) Run a straight edge along the inside of the mid-rollers making sure the straight edge contacts all the wheels.
d.) Measure the distances between the straight edge and the string line.
e.) If the front of the track frame appears to "toe-in", loosen the front mounting bolt and the stub shaft cover, assemble an adequate amount of shims between the face of the front axle and the track frame until the frame is straight.
NOTE: Make sure there is still an adequate amount of material remaining in contact between the milled shoulder of the front axle and the track frame (approximately 3/4 in). See Figure 3.
f.) If the track frame appears to "toe-out", loosen the front mounting bolt and remove shims until the frame is straight. If shims are not present, inspect the track frame, stub shaft, and front axle to see if they are bent or located incorrectly. If they are incorrect, take steps to correct the problem.
g.) If the alignment arm is bent, inspect the inside of the track frame where the front axle is inserted. Make sure the front axle is not protruding past the track frame material. If the front axle is protruding, check to see if the alignment arm was in contact with it. If contact was present, note the severity and determine if that was the cause of the bend in the arm. If this is the case, take measures (add shims) to correct the problem. If it appears that this is not the problem, then replace the alignment arm with a new one.
h.) Reassemble the belt to the track frame. Follow the procedure in Step 4 to align the belt.