Great Plains 3P1006NT Assembly Instructions - Manual (Page 13)

Install Hydraulics Front Page Part Lists Great Plains Manufacturing, Inc. 13
05/05/2011 Front Page Part Lists 151-181M
Charge and Bleed
Refer to Figure 16
Perform this bleed only with the hydraulic system empty or in
Float. Cracking an ORB fitting on a pressurized system will
damage the O-ring.
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.
Bleed pressurized lines only at:
JIC (Joint Industry Conference, 37 ° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Never bleed pressurized lines at:
ORB (O-Ring Boss) or
QD (Quick Disconnect) fittings.
55. Check hydraulic fluid in tractor reservoir and fill res-
ervoir to proper level. Add fluid to system as needed.
A low reservoir level may introduce air into the sys-
tem, causing jerky or uneven cylinder movements.
56. Hitch drill to tractor.
57. If lift-assist lock channel or stroke control spacers are
installed, raise drill and remove them.
58. Fully lower drill.
59. Set tractor lift circuit to Float and shut off tractor.
60. Crack (slightly loosen) JIC connection at elbow fit-
ting.
61. Start tractor. Slowly Extend lift-assist circuit until oil
seeps at cracked fitting.
62. Set circuit to Neutral and shut off tractor.
63. Tighten JIC fittings to 18-20 ft-lbs (24-27 N-m).
64. With the hydraulics bled and tightened, raise drill and
re-install removed lock channel or spacers.
Figure 16
Hydraulic Cylinder
32056
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