TM 5-6675-348-13&P
BLADE BACKLASH ADJUSTMENT.
a.
Measure.
(1)
Roll blade (1) to vertical position (2) and
sideshift blade to area of greatest wear on
slide rails (3).
(2)
Let right side blade (1) hang in air while left
side blade (1) is placed firmly on ground.
NOTE
When taking vertical distance measure-
ment, ensure blade roll backlash does
not cause errors in your reading.
During grading, blade roll backlash is
usually loaded one way and does not
have much effect on cross-slope accuracy.
It will, however, affect elevation accuracy.
(3)
Using a straightedge, measure vertical
distance (4) from bottom of circle to top of
slide rail (3) on right side.
(4)
Place right side blade (1) firmly on
ground while left side blade (1) hangs in
air and repeat vertical distance
measurements on right side.
(5)
Difference between two measurements is
backlash [Step (3) - Step (4) = backlash].
(6)
Repeat Steps (2) through (5) on left side.
(7)
Side shift blade (1) to area of least wear
on slide rails (3) and repeat Steps (2)
through (6) above.
(8)
If vertical distance measurements taken
in Steps (5) for either left or right side are
over 1/8 in. (0.32 mm) greater than
vertical distance measurements from
Step (7), slide rails (3) should be repaired
or replaced. Notify Direct Support
Maintenance.
