
2019-04-12
417-459M
NP2540
Appendix B - Initial and Option Setup
174
Lift-Assist Valve Setup
1. Locate the one-way restrictor valve at the tee that
supplies the rear cylinder base ends.
2. Turn the knob fully counterclockwise.
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 103 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).
Figure 102
Lift-Assist Valve
31612
1
1
Figure 103
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