Great Plains NP30A 30-foot Predelivery Manual - Manual (Page 15)

08/30/2011 Table of Contents Index 407-313Q
Great Plains Manufacturing, Inc. Table of Contents Index 11
Prepare Hydraulics
Crushing Hazards / Equipment Damage Risk:
Do not operate the hydraulic systems until charged. If there is
air in any part of the systems, wings could fall suddenly, and
sections could lift unevenly, or fall suddenly. Anyone in the
path of movement could be seriously injured or killed. Major
equipment damage is possible.
High Pressure Fluid Hazard:
Relieve pressure before disconnecting hydraulic lines.Wear
protective gloves and safety glasses or goggles when working
with hydraulic systems. Use a piece of paper or cardboard,
NOT BODY PARTS, to check for suspected leaks. Escaping
fluid under pressure can penetrate the skin, causing serious
injury. If an accident occurs, seek immediate medical assis-
tance from a physician familiar with this type of injury.
Hydraulic systems may not be pre-charged at the factory.
Systems also vary by hitch type.
Disable Weight Transfer
Do this for all hitch types.
Refer to Figure 14 (depicting an NP3000, which has an
identical weight transfer control system)
17. Close the weight-transfer shut-off valve
(shown
closed in Figure).
18. Release the locking discs ( , ) on both valves.
19. Close the bypass valve (the valve without the
pressure gauge ) by turning the control knob
fully clockwise.
20. Open the pressure reducing valve by turning the
control knob fully counter-clockwise.
These settings are for hydraulic charge only. Initial field
values are set later at “Set Rough Weight Transfer” on
page 32.
Continue at the page for the implement configuration:
2-Point Hydraulics ....................................................12
3-Point Hydraulics ....................................................13
Pull-Type Hydraulics.................................................14
JIC Torque Chart
Bleed only at JIC and NPT fittings.
Never try to bleed a QD (Quick Disconnect) fitting.
Avoid bleeding at ORB fittings. The O-ring is likely to be
torn if any pressure remains in the circuit.
Over-Torque and Leak Risks:
JIC (Joint Industry Conference 37
° Flare) fittings do not
require high torque. Excess torque causes leaks. JIC and
ORB (O-Ring Boss) fittings do not require sealant.
Size Foot-Pounds N-m
7 ⁄
16
-20 11-12 15-16
1 ⁄
2
-20 15-16 20-22
5 ⁄
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
Figure 14
Weight Transfer Adjustment
32041
7
4
3
6 2
8
5
1
1
2 3
4
5 6
7
8