15
General Information
ALIGNMENT
Bow
Similar to toe-in and toe-out, but roller
frame is bent and curves in or out with
respect to tractor.
CAUSE: bent roller frame
EFFECT: similar to toe-in and toe-out
except rear rollers are not affected
REMEDY: straighten roller frame
Twist
When viewed from the front, the roller
frame is twisted, with the front end of the
roller frame tilted out.
CAUSE: roller frame twisted around a
horizontal axis parallel to the tractor
EFFECT: similar to effect of tilt except
that rear rollers should not be affected
REMEDY: straighten roller frame
Idler Mounting
Toe-in or Toe-out
When viewed from top, idler is not parallel
to center line of roller frame.
CAUSE: bent idler support box sections or
bent idler yoke
EFFECT: wears inner rail sides and idler
flanges most — may affect wear on front
roller flanges
REMEDY: straighten idler support box
sections or yoke
Idler Height
The distance that the tread of the track
idler is above the tread of the adjacent
track roller.
CAUSE: insufficient or excessive idler
height
EFFECT: as track roller tread wear and
damage, deterioration or loss of bogie pads
occur, and excessive machine vibration
may result. Vibration is the result of insuf-
ficient idler height. Excessive idler height
results in poor dozing control, particularly
while performing finish dozing operations.
REMEDY: correct shimming