Filter
Top Products
14 Operation
MAN0450 (10/28/2005)
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.
Should you become confused during operation, simply
let go of the controls. The valve control handles will
automatically return to neutral.
BH80-X SWING SPEED CONTROL
The swing speed control valve is located on the back
side of the console on BH80-X backhoes only. This
controls the speed of the swing cylinders and allows for
easier operation in tight areas. Turn knob to the right to
Decrease swing speed and to the left to increase swing
speed.
START EXCAVATION
Consult local utilities before working. Know
location of all underground cables, pipelines, over-
head wires, and other hazards in working area and
avoid contact.
Figure 3. Starting Position
To start the excavation, position backhoe as shown in
Figure 3 for maximum breakout force.
Actuate the dipper cylinder to start digging. Approxi-
mately halfway through digging cycle, start bucket curl
while continuing crowding dipper in. Should bucket
stall, raise boom slightly.
Do not use down pressure on the boom when starting
to dig, as this will lift the machine and move it out of
alignment with the work.
FILL BUCKET
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.
Penetration depth is determined by soil condition and
type.
Only use dipper and bucket during the digging cycle.
As the dipper 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.
To obtain a cleaner trench and avoid material buildup
directly in front of backhoe, extend dipper and curl
bucket completely while starting to lift it out of the exca-
vation. This will allow excess material to fall back into
the excavation.
Figure 4. Fill Bucket
DUMP AND RETURN CYCLE
Keep the swing-dump-return cycle as brief as possible.
Keep dipper moving outward and start boom swing as
soon as the bucket clears the excavation. Continue
extending dipper and, as you approach the spoil pile,
start to dump bucket.
When bucket is empty, dipper and bucket are in posi-
tion to resume digging upon return to the excavation.
TRENCHING AND EXCAVATING
Refer to Figure 5.
Trenching is the most basic backhoe digging operation.
Other operations are variations of this basic function.
To maintain a level trench bottom, set bucket at proper
approach angle and while crowding dipper-stick in,
continually move bucket curl lever to maintain correct
cutting angle. At the same time, place boom control in
the full forward (float) position and keep the bucket in
the same plane.
When handle is placed in the float position, pressure
on both sides of boom cylinder is released.