Bleeding marker hydraulics – Great Plains 2510HDF Operator Manual User Manual
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52
1510HDF/2010HDF/2510HDF
Great Plains Manufacturing, Inc.
288-340M
2013-11-11
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 markers 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.
High Pressure Fluid Hazard: 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 acci-
dent occurs, see a doctor immediately. If an accident occurs,
seek immediate medical treatment 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.
Machine Damage Risk: JIC fittings do not require high
torque. JIC and O-ring fittings do not require sealant.
Always use liquid pipe sealant when adding or replacing
(NPT) pipe-thread fittings. To avoid cracking hydraulic fit-
tings from over tightening, and to keep tape fragments from
clogging filters, do not use plastic sealant tape.
Refer to Figure 49
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 49
Marker Cylinder Bleed
18942