GREAT PLAINS 3P1006NT-1575, Operator'S Manual, Page: 36 / 80

Great Plains | 151-144U | 2019/03/14 30
3P1006NT Table of Contents Index Maintenance
To check chain slack:
1. Measure the span (1) for allowable slack. Locate
the longest span of each chain.
2. Measure the current slack (2). At the center of
the span, deflect the chain at a right angle in both
directions. The slack is the distance of the
movement.
3. Determine the ideal slack:

Long chains (over 91cm) - 21 mm/m

Vertical short chains - 21 mm/m

Horizontal short chains - 42 mm/m
4. Adjust the idlers for ideal slack.
Whenever mounting a chain, make sure the clip at
the removable link is positioned to minimize snags.
Install the clip with the open end facing away from the
direction of chain travel (1).

Lift-Assist Adjustment
It may be necessary to make adjustments to the
eyebolts (1) at the top of the lift-assist, for example, if
the lowered position is too high even with no spacers
on the cylinder rod.
The factory setting is 88.9 mm (A).
To make adjustments:
1. Determine what change in drill height is required.
2. Hitch the drill to the tractor’s 3-point lift arms.
Raise the drill, and support the rear tool bar on
jack stands.
3. Loosen the jam nut (2).
4. Rotate the adjuster nut (3) by the height change
required.

Moving the eyebolt lower increases height.

Moving the eyebolt higher decreases height.
5. Tighten the jam nut.
6. Lower the drill and check the setting.

Bleed Hydraulics
High Pressure Fluid Hazard
Escaping fluid under pressure can have
sufficient pressure to penetrate the skin.
Check all hydraulic lines and fittings before
applying pressure. Use paper or cardboard,
not body parts, and wear heavy gloves to
check for suspected leaks. If injured, seek
immediate medical attention from a
physician familiar with this type of injury.
Bleed pressurized lines only at JIC or NPT fittings.
Avoid bleeding at ORB. Never bleed pressurized
lines at QD fittings.
1. Check hydraulic fluid in the tractor reservoir and
fill the reservoir to the proper level. A low
reservoir level may introduce air into the system,
causing jerky or uneven cylinder movements.
2. Hitch the drill to the tractor.
3. Raise the drill and remove lift-assist lock channel
or stroke control spacers if installed.
4. Fully lower the drill.
5. Set the tractor lift circuit to float and shut off the
tractor.
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1
27264
26482
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1
2
A
71018B
3
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