Great Plains YP1625 Operator Manual - Manual (Page 74)

70 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Bleeding Hydraulics
Bleeding Lift Hydraulics
Normally the lift hydraulics are bled at the factory before
shipping and bleeding should not be required other than
to raise fully and hold lever on for one minute or until all
cylinders extend fully.
Bleeding Fold Cylinder Hydraulics
Normally the fold hydraulics are bled at the factory before
shipping and bleeding should not be required other than
to fold fully and hold lever on for one minute or until all
cylinders reach the end of their stroke.
IMPORTANT !
Do not fold or unfold without first raising planter com-
pletely.
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of
air. If the markers fold in jerky, uneven motions, follow
these steps.
!
WARNING
Escaping fluid under pressure can have sufficient pressure to
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
leaks. Wear protective gloves and safety glasses or goggles
when working with hydraulic systems. If an accident occurs,
seek immediate medical attention from a physician familiar
with this type of injury.
!
WARNING
Only trained personnel should work on system hydraulics!
Check that tractor hydraulic reservoir is full.
1. Set the solenoid to marker operation.
2. With both markers lowered into field position, loosen
hydraulic-hose fittings at rod and base ends of
marker cylinders. If applicable, loosen fittings on
back side of sequence valve.
3. With tractor idling, activate tractor hydraulic valve
until oil seeps out around a loosened fitting. Tighten
that fitting.
4. Reactivate tractor hydraulic valve until oil seeps out
around another loosened fitting. Tighten that fitting.
Repeat process until all loosened fittings have been
bled and tightened.
!
CAUTION
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics
fail. Never allow anyone near the planter when folding or
unfolding the markers.
IMPORTANT !
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.
IMPORTANT !
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 fittings from over
tightening, and to keep tape fragments from clogging
filters, do not use plastic sealant tape.