Figure 12-24. - Aligning track roller frame with sprocket.

The center guiding guards or track roller guards are available as attachments and are a continuation of the "hold the line" safeguard so important to extending track life. These center guards keep the track in line between the rollers when operating in rocky, uneven, or steep-sloped terrain, thereby reducing wear on the roller flanges and track links.

When aligning the track roller frame with the sprocket and adjusting the front idler, you must follow the manufacturer's procedures. The following procedure is an example of what is involved in these adjustments.

TRACK ROLLER FRAME ALIGNMENT WITH SPROCKET

1. For the following example, refer to figure 12-24. For the track to lead straight off of the rear roller (5) onto the drive sprocket (8) and not rub against either the sides of the sprocket or the rims of the track roller, the center of the roller should be centered with the sprocket.

2. The drive sprocket (8) should be centered with the rear roller (5) so the area (10) and (12) between the

Figure 12-25. - Aligning idler with track rollers.

outer face of the sprocket and the inner edge of the track roller rim are equal.

3. In the recess in the steering clutch case (15), check the clearance of the diagonal brace (13) at points (14) and (16).

4. To make this adjustment, remove the cap (1) from the outer bearing assembly (4) and take off the lock ring (7), nut (2), and retainer assembly (9).

5. To move the roller frame out, you add shims (3) between the retainer assembly (9) and the holder assembly (11). This will decrease the clearance (12) at the roller and at the diagonal brace ( 14) and increase the clearance at (10) and ( 16).

6. To move the roller frame closer to the tractor, you remove shims (3). This decreases the clearance at (10) and (16) and increases the clearance at (12) and (14).

ADJUSTMENT OF THE FRONT IDLER

For the adjustment of the front idler, refer to figure 12-25. To align the idler with the track rollers and keep the clearance between the yoke and the plate within specifications for dimension (B), you install shims (1) and (3) between collars (2) and bearings (8).