706/1006NT
Table of Contents
Setup
19
01/22/2018
Table of Contents
150-285Q
Hydraulic Charge and Bleed
Refer to Figure 18
The drill lifting system is equipped with rephasing type
hydraulic cylinders that require a special procedure for
bleeding air from the hydraulic circuits. Read and follow
this procedure carefully. Rephasing type cylinders will
not function properly with air in hydraulic circuit.
1.
Check hydraulic fluid in tractor reservoir and fill
reservoir to proper level. Drill-system capacity is
about one gallon (3.8 liters). Add fluid to system as
needed. A low reservoir level may draw air back into
the system, causing jerky or uneven cylinder
movements.
2.
With drill attached to tractor, jack drill up and support
frame at ends near gauge wheels.
3.
With drill raised and supported, un-pin cylinders from
gauge wheel arms and frame. Turn cylinders “rod
end up”. Wire or otherwise safely support rod ends
higher than base ends.
NOTE:
In order to prevent trapped air pockets, rod end must
be higher than any other part of cylinder during
bleeding operation.
4.
With tractor engine idling, engage tractor hydraulics
to extend cylinder rods. When cylinder rods are
completely extended, hold remote lever on for one
minute.
5.
Retract cylinders. Extend cylinders again and hold
remote lever on for one more minute. Repeat this
step two more times to completely charge and bleed
system.
6.
Re-pin cylinders to drill frame and gauge wheel arm
with transport cylinder locks in place. If any air still is
trapped in either cylinder, the cylinder will have a
spongy, erratic movement and drill will not raise
evenly. If necessary, repeat bleeding process.
7.
Refill tractor hydraulic fluid reservoir to its proper
level.
NOTE:
After the drill is raised, a slight settling occurs due to
the action of the rephasing cylinders.
Figure 18
Elevate Cylinder
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