Parker Series V14 - HPC, HP control with pressure cut off; Cut off pressure setting procedure

16
Parker Hannin
Pump and Motor Division
Trollhättan, Sweden
Service Manual
Series V14
Bulletin HY30-5510-M1/UK
HPC, HP control with pressure cut off
- The pressure cut off overlays the
HP control.
- If the system pressure increase, due
to the load or reduced motor displacement,
to the setting of the pressure cut off valve,
the control increases displacement.
When displacement increases, the available
torque increases as well but the system
pressure remains constant.
- Pressure cut off range is 75 - 400 bar
(1100 - 5800 psi)
- Threshold pressure is preset from factory
to 10 bar (145 psi) but is adjustable between
5 and 50 bar (70 - 700 psi).
Cut off pressure setting procedure:
Untie the locking nut. One turn of the setting screw corre-
sponds to 48 bar. When desired pressure level is reached,
tighten the locking nut.
1. Install 0 - 600 bar (0 - 8500 psi) gauges in port X1 and X4
and a 0 - 60 bar (0 - 850 psi) gauge in port X5.
2. Set the cut off pressure to minimum by turning the
setting screw counter-clockwise until a distinct stop is
reached.
3. Set the motor displacement to minimum by applying
required pressure to port X5.
4. Increase the pressure in one of the main ports A/B (e.g. by
blocking the motor shaft) to desired cut off pressure level.
5. Turn the setting screw clockwise, until the pressure in
port X1 reaches the same pressure level as in X4.
Desired cut off pressure has been reached.
HPC schematic (shown: port X5 not pressurized;
control moving towards max displacement).
V14_HPC_schematic.eps
Leif A./ 10-08-11
A
B
X1
X4
(1/4" BSP)
E
C
F
D
Min
Max
X5
Max 100 bar
Cut off setting screw