Great Plains NTA3007HD Operator Manual - Manual (Page 119)

Maintenance and Lubrication 115
04/04/2011 166-207M
Bleeding Down-Pressure Hydraulics
If the systems have sufficient fluid for safe operation,
prior to bleeding, perform unfold (page 25), tilt down
(page 28) and lower (page 32) operations. Set circuit to
Float.
1. Review safety advisories and operational advice on
page 112, and on this page, before performing
bleed.
Refer to Figure 119
2.
Fully close bypass valve and Transfer valve .
Fully open Wing and Center transfer valves.
Refer to Figure 120
3.
Un-pin six cylinder rod ends. Orient cylinders so that
rod ends may extend without striking drill parts.
4. Fully retract cylinders. Set circuit to Neutral.
5. Loosen the JIC fittings at the base end of all
down-pressure cylinders.
6. Slowly extend the circuit until fluid appears at a loos-
ened fittings. Set circuit to Neutral and secure fit-
tings. Repeat until all six fittings are secured.
7. Fully extend cylinders. Set circuit to Neutral.
8. Loosen the JIC fittings at the rod end of all down-
pressure cylinders.
9. Slowly retract the circuit until fluid appears at a fit-
ting. Set circuit to Neutral and secure fitting. Repeat
until all six fittings are secured.
10. Use tractor circuit to re-position rod ends and re-pin.
11. If bleeding is complete, restore bypass, down-pres-
sure and weight transfer valve settings per:
“Opener Down-Force (Hydraulic)” on page 85.
Null4:
Figure 119
Bleed: Down-Pressure Valves
29422
W
C
T
B
k
r
w
c
t
B T
W C
1
Null4:
Figure 120
Fold Bleed Points
29484
2
2
1
2
1
2
2
2
1
1
1
2
2