Great Plains 3S-5000HDF Operator Manual - Manual (Page 65)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 61
2012-08-14 Table of Contents Index 195-325M
Bleeding Opener Lift Hydraulics
Refer to Figure 56
1.
Check hydraulic fluid level in tractor reservoir and fill
to proper level. Add fluid to system as needed.
System capacity for entire drill is about
4
1 ⁄
2
gallons (17 liters).
2. Make sure opener frames are locked up in road
position. See “Opener Lock Up” on page 32.
3. Turn knob on both pressure-control valves
completely counterclockwise, then turn valves
clockwise far enough to build up 1000 psi (about
three turns).
4. Turn knob on bypass valve completely clockwise
for no oil flow.
5. Loosen four top hose-end fittings at the locations
shown.
Note: Do not loosen an O-ring fitting for bleeding.
Bleeding air from an O-ring fitting will damage the
seal.
6. Slowly supply oil to top side of pressure-control
valves until oil begins to appear at a loosened hose
fitting. As oil begins to appear at a fitting, tighten that
fitting.
7. Slowly supply oil to bottom side of pressure-control
valves until oil begins to appear at remaining
loosened hose fitting. As oil begins to appear at the
fitting, tighten fitting. Continue to supply oil to bottom
side of pressure-control valves until all openers are
raised completely.
8. Move opener transport locks to field position and
cycle openers up and down ten times. Each time you
lower openers, hold tractor remote lever until opener
circuit builds up to pressure set at control valves.
9. After cycling openers, return opener transport locks
to road position.
Figure 56
Bleeding Opener Lift Hydraulics
34348
1
2
2
2
2
1
2