Typical Operation - Case 845B VHP Operator's Manual

Cutting a "V" Ditch
Keep the frame straight if the ditch is being cut in solid
material.
If the dirt is loose, articulate the machine so that the rear
frame and tandems are maintained on the most firm
ground.
With the circle directly under the frame, position the blade
end bit slightly outside the front wheel. Incline the blade
forward so that the top edge of it is in line with the center
of the front tire.
Position the blade in such a way that the discharge of the
material is in the center of the machine, between the tan-
dems, lean the front wheels in the direction of discharge.
From the first pass, in 1st or 2nd gear, cut only the mate-
rial necessary to maintain the ditch line. For the second
pass, position the wheels inside the ditch and with a spe-
ed slightly higher than first pass maintain 3:1 ratio betwe-
en the ditch walls and depth.
The material discharge should be maintained between
the tandems. A cleaning pass is necessary.
Move the circle and the blade in the direction of the ditch
with the blade extended well behind the column of mate-
rial, in such a way that the dirt cannot fall into the ditch.
The blade end bits should be positioned between the rear
wheels with the blade tilted slightly forward, to make ma-
terial rolling easier. All the ditches should be cut with the
differential locked, in 2nd or 3rd gear.
To cut ditches with walls with a 1,5:1 and 2:1 slope, shift
the circle and blade against the bank.
Align the top of the moldboard with the center of the rear
tire. Position the end of the blade outside of the front tire
and pitch the blade slightly toward the front. Turn the whe-
els toward the "U" ditch in such a way that material from
the bank is deposited inside the ditch.
CHAPTER 4 – OPERATING INSTRUCTIONS

TYPICAL OPERATION

Make a cleaning pass to remove material from the ditch,
pushing it on the road and spreading it out when neces-
sary.
Terracing – level Curves
One of the most important applications for motor graders
in agriculture is terracing level curves that provide for the
retention and distribution of water in the fields, permitting
an increase in productivity and preventing soil erosion on
hill sides.
This work consists of "V" ditches following the level curves
of the ground with a distance between them of 10 to 100
meters (34 – 338 ft), with the greater distance for small
slopes and the smaller distance for steeper slopes.
Ditch Cutting on flat Plain
The opening of a ditch on a flat plain is a continuation of
"V" ditching.
With the circle centered on the frame in a straight posi-
tion, position the blade end bit behind the outside edge of
the front tire. Angle the blade in such a way that the other
end reaches the width and depth of the ditch desired (with
front scarifiers it is possible to position the blade at 90° if
necessary).
Tilt the blade slightly toward the front, so that material is
spread along the sides of ditch.
This pass should be done in 1st or 2nd gear (with the
differential locked if available on the machine).
On the following pass, push the material outside the ditch
and on the road side. For this, move the circle and blade
outside the pile and angle the blade in such a way that the
material does not return into the ditch.
Maintain the edge of the blade near the front tire, to keep
small mounds of material from returning into the ditch. For
the next pass, spread the material lightly from the road
shoulder toward the center of the road.
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