Great Plains 3P1006NT Operator Manual - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 53
2011-12-20 Table of Contents Index 151-144M
Bleeding Hydraulics (s/n A1058W-)
(applies to drills with serial numbers A1058W-
For serial number A1059W+, see page 52)
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. Fluid escaping from a very small hole can
be almost invisible. 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.
Check that tractor hydraulic reservoir is full.
Bleed pressurized lines only at:
JIC (Joint Industry Conference, 37
° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Avoid bleeding at:
ORB (O-Ring Boss)
Never bleed pressurized lines at:
QD (Quick Disconnect) fittings.
1. Check hydraulic fluid in tractor reservoir and fill
reservoir to proper level. Add fluid to system as
needed. A low reservoir level may introduce air into
the system, causing jerky or uneven cylinder
movements.
2. Hitch drill to tractor (page 14).
3. If lift-assist lock channels or stroke control spacers
are installed, raise drill and remove them.
4. Fully lower drill (page 21).
5. Set tractor lift circuit to Float and shut off tractor.
6. Crack (slightly loosen) JIC connection at tee fitting
(under walkboard).
7. Start tractor. Slowly Extend lift-assist circuit until oil
seeps at cracked fitting.
8. Set circuit to Neutral and shut off tractor.
9. Tighten JIC fittings to 18-20 ft-lbs (24-27 N-m).
10. With both sides bled and tightened, raise drill and
re-install removed lock channels or spacers.
Figure 48
Lift-Assist System Bleed
(s/n A1058W-)
28225
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