14
Parker Hannifin
Pump and Motor Division
Trollhättan, Sweden
Service Manual
Series V14
Bulletin HY30-5510-M1/UK
EP control function
(solenoid current increasing)
Refer to the illustration below left:
At an increasing current (above the threshold
value), the solenoid spool pushes left on the
servo valve spool, and flow is directed to the
left hand setting chamber - the setting spool
moves to the right and the displacement de-
creases.
This means, that the shaft speed increases
while the output torque decreases correspon-
dingly (at a constant pump flow and system
pressure).
V14_EP_function_1.eps ny
Leif A./01-04-03
6,5
35
Max
Min
E
D
C
A
B
Solenoid
EP control function (displ. decrease at increasing
current).
HP control function
(decreasing pilot pressure)
Refer to the illustration below right:
When the pilot pressure decreases, the pilot
piston retracts, the servo valve spool moves
to the right and flow is directed to the right
hand setting chamber - the setting spool
moves to the left and the displacement in-
creases.
The shaft speed now decreases and the
available output torque increases corres-pon-
dingly (at a constant pump flow and system
pressure).
V14_HP_function.eps
Leif A./01-04-04
E
D
C
6,5
35
Max
Min
A
B
Pilot
port X5
HP control function (displ. increase at decreasing
pilot pressure).
EO/EP/HO/HP port and restrictor
locations
Port connections and restrictor posi-
tions
(EP control)
A.
Port A connection
B.
Port B connection
C.
Restrictor position, max-to-min
servo pressure
D.
Restrictor position, min-to-max
servo pressure
E.
Restrictor location, servo supply
(refer to cross section page 12)
V14_EP_module.eps
Leif A./01-03-13
A
B
O-ring groove
C
D
Facing motor housing
A
D
C
B
O-ring
Facing motor
