Section 3
OPERATION
3-23
785 Motor Grader
3. Spread windrows by putting blade at an angle
of 10° - 25° toward center.
4. Keep blade above level of undisturbed surface
so as to avoid collision with solid objects such
as rocks in roadbed.
5. Perform crowning operation at relatively high
speed. High speed causes loose material to be
thrown from the blade, which feathers the
material and blends it at the top.
NOTE: Any ridge that is left in the center can
then be spread out at high speed with
a straight blade.
Bank Cutting
1. The first pass should be at the base of the
bank to level and smooth a platform for the
grader.
2. Locate heel of blade in front of center of rear
wheel.
3. Shift toe of blade forward.
4. Tilt blade forward.
5. Lean wheels slightly toward bank.
6. Position grader frame straight with all wheels at
base of bank, or if more reach is needed,
articulate slightly to position front inside wheel
on bank.
Three methods can be used to vary depth of cut
these are;
1. Leaning wheels away or toward the bank.
2. Maneuvering lift cylinders.
3. Changing blade pitch.
NOTE: After first bank cut, it may be
necessary to clean loose material away
from bottom of bank.
Slope Work
1. The first pass should be made from above the
slope, if possible, to establish angle.
2. Side-shift the circle and the blade toward slope.
3. Set blade angle slightly toward rear of machine
with a slight forward tilt.
4. Reach the blade as far down slope as possible
and make first pass.
NOTE: The grader can be in straight frame
position or articulated for extra reach.
5. Lean front wheels toward slope on second
pass.
6. To help prevent front end from drifting down,
position upper front wheel above windrow.
7. To increase stability of machine, articulate
tandems down slope.
8. Position toe of blade forward and angled so
material is spilled off heel of blade slightly
between or under tandems. Set blade pitch
ahead of vertical plane and side-shift circle
toward the upside.
9. Repeat the procedure until dirt is deposited at
toe of slope. Establish toe of slope by cleaning
windrow away from bottom.
10. When working on steep slopes, the differential
may be locked or unlocked at the operator's
preference.
CAUTION: A rollover with the grader
articulated is very unlikely;
however, extreme caution should
always be used when working on
slopes steeper than three to one.
Cul-De-Sacs
1. Shift circle to outside.
2. Articulate grader to inside.
3. Tilt blade forward about 5° - 10°.
4. Travel in 1st gear, fast idle with front wheels
leaning toward direction of turn.
NOTE: After curb is poured, back fill against
the outside of curb to give support.
To finish grading, as the turns become shorter on
each succeeding pass, the circle and moldboard
are shifted toward the center. Then any excess
material left in the middle can be moved out of the
cul-de-sac.
LOADING GRADER ON A TRAILER
1. Place chocks against truck wheels.
CAUTION: Ramps must be strong enough to
carry the weight of the grader. Also
the ramp must have a low angle,
and correct height.
2. Use a ramp or loading dock. Load and unload
grader on a level surface.
Courtesy of Machine.Market
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