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Operation 17
MAN0450 (10/28/2005)
NOTE: Circuit must be complete to prevent damage to
tractor hydraulic system.
Figure 9. Tractors with Open-Center Valves
MECHANICAL THUMB (OPTIONAL)
The mechanical thumb is used for grabbing objects
and securing them between the thumb and the bucket.
Become familiar with the geometry and extra weight
the thumb adds to the backhoe before operating. Large
heavy objects such as rocks and logs can increase
momentum when pivoting backhoe to the side. DO
NOT make sudden stops and starts. Be extremely
careful lifting and moving long items such as poles or
tree limbs which may extend beyond the normal back-
hoe operating area.
Improper usage can also damage the thumb or back-
hoe. DO NOT use the thumb to rake material, push or
pull material, use the side of the thumb to move mate-
rial, use as a lifting devise with chain or rope, or as a
pry bar to dislodge objects.
Place thumb in operating position by selecting an
appropriate pin location on the telescoping tube.
Rotate the bucket to hold material against the thumb.
When normal backhoe operation is required, place
thumb in storage position. Remove pin, rotate thumb
up against dipper, and insert pin to lock thumb into
position.
PRE-OPERATION CHECK LIST
(OWNER'S RESPONSIBILITY)
The operator should perform the following check list
before operating backhoe.
___ Check that backhoe is properly and securely
attached to tractor.
___ Make sure all hydraulic connections are tight
and all hydraulic lines and hoses are in good
condition before engaging tractor PTO.
___ Check that there are no leaks in the hydraulic
system. Before operating, all hydraulic hoses
must be routed properly and not be twisted,
bent sharply, kinked, pulled tight or frayed.
___ During inspection, check that all nuts and bolts
are secure and clevis pins are properly cotter
pinned.
___ Be sure special heavy-duty top link, provided
with backhoe, is installed.
___ Make sure only original equipment high-
strength top link pin, provided with tractor, is
used to attach top link to tractor.
___ Use a 3/4" x 3-1/2" grade 5 bolt to mount top
link to backhoe.
___ Make sure tractor lower lift arm stabilizers
(blocks or chains) are positioned to prevent lift
arms and backhoe from swaying.
___ Place all backhoe controls in neutral position
before starting tractor engine.
___ Check hydraulic reservoir level.