Great Plains NP4000 40-foot Operator Manual - Manual (Page 114)

407-776M Table of Contents Index 2012-03-28
110 NP4000 Table of Contents Index Great Plains Manufacturing, Inc.
Appendix B - Option Setup
Hydraulic Pump Setup
Pump Fittings and Needle Valve
Equipment Performance Risk:
Prior to first use, the pump fittings must be configured for the
type of hydraulic system provided by the tractor. If the system
is Open Center, the needle valve must also be adjusted.
As delivered, the hydraulic pump includes all fitting
necessary for use with any hydraulic system, but the
as-shipped pump configuration is suitable for use with no
system. Configure the pump before first use.
1. Have the Ace Pump Instruction manual (HYD-MAN)
at hand for fitting use and adjustment details.
Refer to Figure 64 and table at right
2.
Determine the tractor hydraulic system type. Consult
the tractor operator manual.
3. Remove one or both fittings ( or ), and as
necessary, adjust the needle valve , based on the
system type.
Follow the instructions in the Ace manual.
For needle valve adjustment, obtain “dead head”
pressure by using the controller console to command the
flow control valve to closed (rate zero).
.eps
100%
Figure 64
Pump Configuration
31965
Tractor Hydraulic
System Type
Pump Configuration
Required
Closed Center,
Load Sensing
(LS Closed)
Restrictor Orifice OUT
Flow Limiter IN
Needle Valve closed
Closed Center,
Pressure Compensating
(PC Closed)
Restrictor Orifice IN
Flow Limiter OUT
Needle Valve closed
Open Center
Restrictor Orifice OUT
Flow Limiter OUT
Needle Valve adjusted
1
2
3
1
2
3
1
2
3
1
3
2
1 2
3