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OPERATION
6.
7.
8.
9.
Operate control levers, swinging boom several
times to practice control.
Do
not operate swing
more than
45'
each way the first few times.
Gradually increase arc.
After becoming familiar with the backhoe
operation, practice coordinated use of the
controls in a safe open area at reduced engine
speed. Gradually increase engine speed as the
technique is mastered.
Operate backhoe gently and smoothly. Avoid
swinging boom into mainframe. Sudden
stopping
or
jerking could result in serious
damage to tractor and backhoe.
Strive to develop a smooth digging cycle. Avoid
abrupt
or
jerky movements. This is
accomplished by operating two
or
more
controls at the same time and not allowing the
cylinders to reach the limit
of
travel.
10.
Should
you
become confused
or
lose your
control orientation during operation, simplyturn
loose of the controls and reorient yourself.
Starting the Excavation (Figure
19)
Consult local utilities before
digging.
Know location
of
and avoid contacting
all underground cables, pipelines, overhead
wires and other hazards
In
digging
area.
1.
To start the excavation, position backhoe as
shown for maximum breakout force.
2.
Actuate the dipperstickcylinder to start digging.
Approximately halfway through digging cycle,
start bucket curl while continuing crowding
dipperstick
in.
Should bucket stall, raise boom
slightly.
3.
Do
not use down pressure on the boom when
starting to dig,
as
this will
lift
machine and move
it out of alignment with the work.
Filling the Bucket (Figure
20)
1.
Control bucket attitude throughout digging
cycle to keep teeth parallel to bottom
of
excavation. This will provide best penetration
angle and minimize dragging and scraping
bucket through the ground.
2.
Penetration depth is determined by soil
condition and type.
3.
4.
5.
Figure
19.
Starting Excavation
Only use dipperstick and bucket during the
digging cycle. As the dipperstick moves the
bucket through the soil, curl bucket to maintain
proper bucket position.
At the end of the pass,
or
when bucket is full,
curl bucket completely, lift bucket from
excavation and swing boom to dump site at
least
two
feet away from opening.
To obtain a cleaner trench and avoid material
buildup directly in front of backhoe, extend
dipperstick and curl bucket completely while
starting to lift it out
of
the excavation. This will
allow excess material to fall back into the
excavation.
Figure
20.
Filling
Bucket
29
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