Bleeding opener lift hydraulics – Great Plains 800 Operator Manual User Manual
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38
800
Great Plains Manufacturing, Inc.
175-057M
2011-10-25
Bleeding Opener Lift Hydraulics
To function properly, the hydraulics must be free of air.
With air in the system, the hydraulics will move in jerky,
uneven motions. If you install or replace a hydraulic
component, follow these steps.
1.
Check the fluid level in the tractor hydraulic reservoir.
Bleeding the hydraulics with a low fluid level will draw
air into the system.
2.
Lower the openers to the ground. Unpin the rod end
of the cylinder from the floating lug. Wire, block up, or
otherwise safely support the cylinder so the rod will
not contact anything when fully extended.
3.
Loosen a JIC connection between the hose and rod-
end cylinder fitting.
4.
With the tractor idling, slowly work the tractor remote
lever as if retracting the cylinder. Continue working
the lever until oil seeps from the fitting. Tighten the
hose connection.
5.
Continue working the lever until the cylinder rod is
completely retracted.
6.
Loosen a JIC connection between the hose and
base-end fitting.
7.
With the tractor idling, slowly work the tractor remote
lever in the opposite direction as if extending the
cylinder. Continue working the lever until oil seeps
from the fitting. Tighten the hose connection.
8.
Continue working the lever until the cylinder is
completely extended. Re-pin the cylinder to the
floating lug.