Bleeding marker hydraulics – Great Plains 2510HDP Operator Manual User Manual
Page 118
114
1510HDP/2010HDP/2510HDP
Great Plains Manufacturing, Inc.
118-245M
2013-10-21
Bleeding Marker Hydraulics
To function properly, the hydraulics must be free of air. If
hydraulics have not been bled, they will operate with
jerky, uneven motions and could cause wings to drop
rapidly during folding or unfolding. If hydraulics were not
bled during initial implement setup or if you replace a
part in hydraulic system during the life of the drill,
complete the following procedures.
Escaping fluid under pressure can penetrate the skin causing
serious injury. Avoid the hazard by relieving pressure before
disconnecting hydraulic lines. Use a piece of paper or
cardboard, NOT BODY PARTS, to check for suspected leaks.
Wear protective gloves and safety glasses or goggles when
working with hydraulic systems. If an accident occurs, see a
doctor immediately. Hydraulic fluid injected under the skin is
an extremely serious matter. If such an accident occurs, seek
urgent medical attention from a physician familiar with this
type of injury.
Bleed only at:
JIC (Joint Industry Conference, 37
°
flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Never bleed at:
ORB (O-Ring Boss) or
QD (Quick Disconnect) fittings.
JIC fittings do not require high torque. JIC and ORB
fittings do not require sealant. Always use liquid pipe
sealant when adding or replacing (NPT) pipe-thread
fittings. To avoid cracking hydraulic fittings from over
tightening, and to keep tape fragments from clogging
filters, do not use plastic sealant tape.
Refer to Figure 123
1.
Extend a marker on one side.
2.
Disconnect the rod end at the marker arm.
3.
Support the cylinder so that the rod cannot strike
anything over its full range of travel.
4.
Supply oil until the rod is fully retracted.
5.
Set circuit to neutral.
6.
Carefully crack the JIC fitting at the base end inlet.
7.
Supply oil to Extend until the fitting seeps. Set circuit
to neutral and tighten fitting.
8.
Supply oil until the rod is fully extended. Set circuit to
neutral.
9.
Carefully crack JIC fitting at rod end of cylinder.
10. Supply oil to Retract until fitting seeps. Set circuit to
neutral and tighten fitting.
11. Adjust rod extension and re-pin.
12. Repeat bleeding for other marker side.
Figure 123
Marker Cylinder Bleed
18942