Great Plains YP4025F-1670 Operator Manual - Manual (Page 100)

96 YP4010HD/YP4025/F Table of Contents Index Great Plains Manufacturing, Inc.
401-571M Table of Contents Index 2014-09-08
Bleeding Hydraulics
Machine Damage Risk:
Do not fold or unfold without first raising planter completely.
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.
If it is necessary to further bleed lift system, see “Lift
Cylinder Bleeding” on page 96.
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.
Erratic gage wheel behavior, such as wandering back
and forth in the field, or failing to rotate fully into place
while folding, are signs that the fold cylinders need to be
bled.
If it is necessary to further bleed fold system, see “Fold
Cylinder Bleeding” on page 97.
Lift Cylinder Bleeding
Refer to Figure 121
1. Unfold and lower planter.
2. Un-pin rod ends of all lift cylinders. Position cylinders
so that rod ends may extend without striking
machine parts.
3. Loosen the JIC fittings at the base end of each
master lift cylinder.
4. Extend the circuit until fluid appears at the loosened
fittings. Set circuit to Neutral and secure fittings.
5. Loosen the JIC fittings at the base end of each
slave lift cylinder.
6. Extend the circuit until fluid appears at the loosened
fittings. Set circuit to Neutral and secure fittings.
7. Re-pin rod ends.
Figure 121
Lift Bleed
25227
1
2
1
2
JIC Torque Chart
Over-Torque Leak Risk:
JIC fittings do not require high torque. Excess torque causes
leaks. JIC and ORB fitting do not require sealant.
Bleed lines only at:
JIC (Joint Industry Conference, 37
° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Never bleed at:
QD (Quick Disconnect) fittings or
ORB (O-Ring Boss) fittings, the O-ring is likely to be torn if
any pressure remains in the circuit.
Size Foot-Pounds N-m
7 ⁄
16
-20 11-12 15-16
1 ⁄
2
-20 15-16 20-22
9 ⁄
16
-18 18-20 24-28
3 ⁄
4
-16 38-42 52-58
7 ⁄
8
-14 57-62 77-85
11 ⁄
16
-12 79-87 108-119
1
2