Hydraulic signal pressure range*
a 3 ± 0.5 bar [43 ± 6 psi]
b 11 ± 0.5 bar [160 ± 6 psi]
Pump output flow direction vs. control pressure
Pump output flow direction vs. control pressure
Input shaft rotation CW CCW
Control pressure to port X1 X2 X1 X2
Port A flow (M1) Out In In Out
Port B flow (M2) In Out Out In
Servo cylinder (side) M5 (2) M4 (1) M5 (2) M4 (1)
Refer to Installation Drawings on page 50, for port locations.
Manual Displacement Control (MDC), Options MA, MB
Warning
Avoid designing a system which puts swashplate into full stroke when control operation is blocked by
contamination.
The manual displacement control converts a mechanical input signal to a hydraulic signal that tilts the
cradle swashplate through an angular rotation varying the pump's displacement from full displacement
in one direction to full displacement in the opposite direction.
The manual displacement control has a mechanical feedback mechanism which moves a servo valve in
the proper relationship to the input signal and the angular position of the swashplate. The control is
designed so that the angular rotation of the swashplate is proportional to the mechanical input signal.
The control is designed with an internal override mechanism which allows the mechanical input to be
moved at a faster rate than the movement of the swashplate without damage to the control.
Features and benefits
•
Precision parts provide repeatable, accurate displacement settings with a given input signal.
Technical Information
Series 90 Axial Piston Pumps
Control Options
34 520L0603 • Rev 0804 • March 2016
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