Great Plains NP30A 30-foot Predelivery Manual - Manual (Page 18)

14 NP30 or NP40 Table of Contents Index Great Plains Manufacturing, Inc.
407-313Q Table of Contents Index 08/30/2011
Pull-Type Hydraulics
Charge PT Lift System
Charge the lift system prior to the fold system, so that lift-
assist is available prior to first fold or unfold.
Refer to Figure 17
37. Disconnect rod ends of lift cylinders. Point rods so
they cannot strike implement parts during exten-
sion. If possible, orient cylinders horizontally, with
re-phasing orifices facing up.
Note: Rod ends of the front (gauge wheel) cylinders are
already disconnected for shipment.
38. Slowly supply oil to the circuit to extend the cylin-
ders.
39. If the cylinders are horizontal, hold at extended for
several seconds to pass oil at the re-phasing ori-
fices.
If the cylinders are not horizontal, hold at extended,
at low flow, for several minutes.
40. Retract the cylinders. Do not hold.
41. Extend and hold.
42. Repeat step 38 through step 41 until cylinder exten-
sion and retraction is synchronized and smooth.
43. Re-connect rod ends of lift-assist cylinders (only, do
not install gauge wheels at this time).
Charge PT Fold System
Refer to Figure 18
Note: On 40-foot models delivered cross-folded
(no transport rest), the rod ends of the fold cylin-
ders are disconnected for shipment.
44. Disconnect the rod ends of the fold cylinders.
45. Elevate the rod ends relative to the cylinder bodies.
Point and support them so that they cannot strike
implement parts during extension.
Note: This may be a slow operation. There are flow re-
stricting orifice plates at each cylinder port.
46. Fully retract the cylinders. Make sure fold locks do
not engage. Set circuit to Float.
47. Slightly loosen (crack) the JIC fittings at the base
end of the cylinders.
48. Slowly extend cylinders. As oil appears at a cracked
fitting, set the circuit to Neutral and secure the fitting.
49. Fully extend, then fully retract several times. Make
sure fold locks do not engage.
50. When the last fitting has been secured, if this is:
• an unfolded implement, or
• a 30-foot implement folded to transport rest,
operate circuit to position rods for re-attachment.
Do not attempt, at this time, to connect rod ends on
cross-folded wings.
Continue at section “Install Components” on page 15.
Figure 17
Pull-Type Lift
31575
Figure 18
Pull-Type Fold
31581
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2
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2
2
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