Great Plains NTA2007HD Operator Manual - Manual (Page 120)

116 Great Plains Manufacturing, Inc. Contents Index NTA607/2007HD
166-283M Contents Index 04/04/2011
Bleeding Fold/Lock/Down-Pressure Hydraulics
If the systems have sufficient fluid for safe operation,
prior to bleeding, perform an unfold (page 30) operation
and a lower (page 35) operation.
1. Review safety advisories and operational advice on
page 114, and on this page, before performing
bleed.
Note: A complete Fan/Fold system re-charge requires
about 20_liters (5.4_gallons) of oil.
Refer to Figure 102 and Figure 103
2.
Turn fan shut-off valve off (page 58).
Set fan circuit to Float.
3. Set both weight-transfer pressure control valves
three turns from fully open. Release lock rings. Turn
knobs fully counter-clockwise. Reverse 3 full turns.
4. Un-pin the wing fold rod ends . Un-pin the cart-
transfer cylinder rod ends . Un-pin the lock cylinder
base end . Block up or wire cylinders so that free
ends may extend without striking drill parts.
5. If extended, completely retract fold and cart transfer
cylinders. Fully extend center lock cylinder rod.
6. Loosen the JIC fittings at
the base end of both fold cylinders
,
the base end of both transfer cylinders , and at
the rod end of the lock cylinder .
7. Slowly extend the circuit (same direction as fan oper-
ation) until fluid appears at each loosened fitting. Set
circuit to Neutral and secure each fitting in turn.
Repeat until all five fittings are secured.
8. Continue to Extend circuit until the fold and transfer
cylinders are fully extended, and the lock cylinder is
fully retracted. Set circuit to Neutral.
9. Loosen the JIC fittings at
the rod end of both fold cylinders
,
the rod end of both cart transfer cylinders , and at
the base end of the lock cylinder .
10. Slowly retract the circuit until fluid appears at a fit-
ting. Set circuit to Neutral and secure fitting. Repeat
until all five fittings are secured.
11. Cycle cylinders full stroke several times.
12. Use tractor circuit to re-position rod ends and re-pin.
13. If no other bleeding is required, adjust the transfer
control valves back to their most recent settings (or
to the suggested default settings). See page 85.
Null4:
Figure 102
Fold Bleed Points
31225
1
5
2
8
1
2
3
4
5
6
7
Null4:
Figure 103
Lock Cylinder
31226
6
7
3
4
9
8
9
4