SystemOne Undercarriage and SALT Undercarriage (Sealed and Lubricated Track)
The following check and adjustment procedure is for both the Caterpillar SystemOne undercarriages that have the center tread idler and SALT undercarriages that have conventional idlers.
The SystemOne undercarriage and the SALT undercarriage will require periodic shim adjustment. This adjustment is dependant upon the wear rate of the link and the roller system.
- Park the machine on a hard, flat surface.
Note: Parking the machine properly is important. Make sure the surface that the machine is on is level and flat.
- Raise the blade to 3 inches off the ground.
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Illustration 2 g02589156 Some components are removed for clarity. Make sure that the following conditions are met when measuring dimension (A).
Rails (1) must contact all rollers (2) the length of the machine. Grouser (3) must be directly under the center of front idler (4) before measuring the grouser raise height (A). Track (5) must be smooth and level between the front idler and the front bottom roller. Grousers (6) under bottom rollers must contact the smooth and level floor.Note: Before measuring grouser raise height (A), make sure that all lower grouser tips are contacting the surface AND all bottom rollers are contacting undercarriage rails.
- Move the machine in reverse until a track shoe grouser is directly below the center of the front idler shaft.
Note: Moving the machine in reverse before measuring the grouser raise height is important. This action prevents undercarriage back bending between the idler and front bottom roller.
- Measure grouser height (A) from the flat ground surface to the grouser tip that is centered below the track idler shaft.
- Maintain the grouser height (rise) to the following dimensions.
- Grouser height (A) at the front Idlers
Minimum -
8 mm (0.31 inch) Maximum -
12 mm (0.47 inch) - Tip. Measure rise height with a shim or plate of a known thickness underneath the track shoe. (An example is an allen wrench.) If you measure with a tape measure from the ground to the edge of the grouser tip (3), the measurement will be less accurate. The rise height will often appear higher than the height really is.
- Grouser height (A) at the front Idlers
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| Illustration 1 | g02647556 |
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Some components are removed for clarity. | |
- If the grouser height is not acceptable, replace the shims with a new set of replacement shims or reverse the shims above and below the idler bearing block. Shim position and block orientation are designed to allow for switching or inverting during the life of the undercarriage.
Note: The factory shims are
6 mm (0.24 inch) and14 mm (0.55 inch) . The service shims are9 mm (0.35 inch) and11 mm (0.43 inch) .Note: Flipping the idler bearing blocks provides
8 mm (0.31 inch) of idler height adjustment.- Top factory shim
14 mm (0.55 inch) - Bottom factory shim
6 mm (0.24 inch) - Top replacement service shim
11 mm (0.44 inch) - Bottom replacement service shim
9 mm (0.35 inch) Note: The shims around each idler must be balanced so that the idler is centered without much freeplay. This action allows the idler to remain centered in the track roller frame. Shimming of the right idler and the left idler is done independently.
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Illustration 4 g03800067 - The sum of the thicknesses of the top shim (A) and bottom shim (B) is to total
20 mm (0.79 inch) . That sum is6 mm +14 mm (0.24 inch + 0.55 inch) or9 mm + 11 mm (0.35 inch + 0.44 inch) .
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Illustration 3 g03732928 - Top factory shim
Note: The idler block centerline and the shaft bore centerline are offset. At factory install or a new undercarriage install, the idler block is assembled to the yoke with the large portion of the idler block facing downward. The large portion of the idler block is
If the machine performance remains unacceptable after the shim adjustments, try the following steps.
- If the ride is unsatisfactory, resulting in a short
152 mm (6 inch) chop of the blade, the idler should be adjusted UPWARD. - If the ride is unsatisfactory, resulting in a longer
1524 mm (5 feet) dip of the blade, the idler should be adjusted DOWNWARD.
- Remove rock guard (7) from the front track idler.
Note: To perform this procedure, digging material away from the area of the grouser, idler yoke, bearing block, and idler guard may be necessary.
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Illustration 6 g03802105 - Loosen the side bolts to the bearing block to accommodate the new replacement service shims.
Note: Two bolts (10) hold the idler yoke to the bearing block.
- Remove top shim (8).
- Raise the machine so the idler is off the ground.
- Lower the machine so the idler rests on a block.
- Remove bottom shim (9).
- Install the replacement service shims into the top and bottom position.
Note: Keep replacement service shims together as one set.
- Use the proper replacement shims to maintain the grouser height between
6 mm (0.24 inch) and10 mm (0.40 inch) , as needed. 476-0370 Kit contains the four following replacement shims: - 475-8402 Shim
11 mm (0.44 inch) thick - 475-8403 Shim
9 mm (0.35 inch) thick - 475-8404 Shim
11 mm (0.44 inch) thick - 475-8405 Shim
9 mm (0.35 inch) thickNote: Slide the bearing block up or down to adjust the height.
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Illustration 7 g03805223 - Maintain distance (D) between the bottom of the yoke and the bottom machine surface of the track roller frame to approximately
20.5 mm (0.81 inch) . This distance is the same for each configuration of the shim and bearing block.Note: This distance allows the sliding movement of the yoke into the track roller frame to remain free. This action keeps the yoke shaft horizontal.
- Use the proper replacement shims to maintain the grouser height between
- Torque the bolts that hold the bearing block. Torque the three M12 bolts to
100 ± 20 N·m (75 ± 15 lb ft) . - Replace rock guard (7). Torque the M16 bolts to
240 ± 40 N·m (175 ± 30 lb ft) . - Raise the machine so the idler is off the ground.
- Remove the block from under the idler and lower the machine.
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| Illustration 5 | g03802082 |
