GREAT PLAINS NTA3007HD, Operator'S Manual

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Great Plains | 166-207M | 02/26/2019 Table of Contents Index 114
NTA907HD and NTA3007HD Table of Contents Index Maintenance and Lubrication
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 111, and on this page, before performing bleed.
Refer to Figure 117
2. Fully close bypass valve and Transfer valve .
Fully open Wing and Center transfer valves.
Refer to Figure 118
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
loosened fittings. Set circuit to Neutral and secure
fittings. 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 fitting.
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-
pressure and weight transfer valve settings per:
“
Opener Down-Force (Hydraulic) ” on page 84.
Figure 117
Bleed: Down-Pressure Valves
29422
W
C
T
B
k
r
w
c
t
B T
W C
1
Figure 118
Fold Bleed Points
29484
2
2
1
2
1
2
2
2
1
1
1
2
2