Great Plains V-300F Operator Manual - Manual (Page 104)

100 V300 & V300F Great Plains Manufacturing, Inc.
148-057M-A 11/15/2007
Bleeding Down-Pressure Cylinder
Bleed (rephase) the lift cylinders before bleeding the
down-pressure cylinder.
Any jacks or stands under the hitch mainframe may be
left in place or removed.
12. Raise the drill and install transport locks on lift cylin-
ders only (not down-pressure cylinder). This is to
minimize drill movement during the bleed.
13. Set the lift circuit to Float. Shut off the tractor.
Refer to Figure 111
14. Set the down-pressure knob
to maximum (fully
clockwise). With the circuit in Float, there will be no
reading on the gauge. Leave the bypass valve
closed.
Refer to Figure 112
15. Disconnect both ends of the down-pressure cylinder,
and support it with the elbows on top, or with the
elbows on one side with hoses down.
16. Activate the lift circuit to fully extend the rod of the
down-pressure cylinder. Set the circuit to Float.
17. Crack (slightly loosen) the JIC fitting at the elbow
of the rod end of the cylinder.
18. Slowly reverse the lever for the hydraulic circuit until
oil seeps from the loose fitting. Set the circuit to Neu-
tral and secure the fitting.
19. Continue supplying oil and fully retract the cylinder.
Set the circuit to Neutral.
20. Crack (slightly loosen) the JIC fitting at the elbow
of the base end of the cylinder.
21. Slowly reverse the lever for the hydraulic circuit until
oil seeps from the loose fitting. Set the circuit to Neu-
tral and secure the fitting.
22. Set the circuit to Float. Shut off the tractor. Re-install
the cylinder.
23. Re-calibrate the down pressure (page 22), then
restore your preferred pressure setting (page 36).
Bleeding Tramline Lift Cylinders
Figure 111
Down-Pressure Valves
27267
5
5
Figure 112
Down-Pressure Cylinder
27160
6
7
6
7