Great Plains 3S-3000F Operator Manual v2 - Manual (Page 22)

20
Section 1 Drill Preparation and Setup
3S-3000 Three-Section Folding Drill 195-110M-A 11/9/07
Great Plains Mfg., Inc.
Bleeding the Opener Lift Hydraulic System
Refer to Figure 1-15:
1. Check that opener frames are locked in ROAD posi-
tion.
2. Turn knobs on pressure-control valves completely
counterclockwise, then turn knobs clockwise three
turns.
3. Turn knob on bypass valve completely clockwise for
no oil flow.
4. Loosen six hose-end fittings at three locations on
opener-lift circuit:
•
both JIC fittings on the two 3/8" opener lift hoses ex-
tending from the end of each wing toolbar,
•
the JIC fittings on the two 3/8" opener lift hoses
feeding the center opener lift cylinders, and
•
the end where these center two hoses tee at the
middle of the center box frame.
5. Slowly supply oil to top side of pressure-control
valves. As oil begins to appear at a fitting, tighten that
fitting. Continue supplying oil until one of the two fit-
tings is tightened at each of the three locations.
6. Slowly supply oil to bottom side of pressure-control
valves. As oil begins to appear at a fitting, tighten that
fitting until all hose fittings are tight. Continue to supply
oil to bottom side of pressure-control valves until
openers are raised completely.
7. Move opener transport hooks to FIELD position and
cycle openers up and down about ten times. Each time
you pressure openers down, hold tractor remote lever
until opener circuit builds up to pressure you have set
at control valves. Turn knobs on pressure-control
valves clockwise far enough to build up at least 1000
psi on pressure gauges when cycling openers.
8. Once openers have been cycled, return transport hooks
to ROAD position and lock openers up.
Bleeding the Opener Lift Hydraulics
Figure 1-15
20009