Control
Direct Displacement Control
The LDU20 features Direct Displacement Control (DDC) .The swashplate angle is set directly by a control
lever or linkage attached directly to the swashplate trunnion. Control lever movement changes the speed
and rotating direction of the motor by increasing or decreasing the swashplate angle.
The control input shaft is configurable on both of left and right hand side of the LDU20.
Control Handle Requirements
Maximum allowable trunnion torque is 79.1 N•m [700 lbf•in]. The approximate torque necessary to rotate
the control per 300 bar and 3000 rpm of system operating pressure is 25 N•m with standard valveplate.
The actual value will vary due to the influence of pump operating conditions. For mating dimensions, see
Installation drawings in LDU20 Technical Information Manual 11071631.
W
Warning
With no external forces applied to the swashplate trunnion, internal hydraulic forces may not return the
swashplate to the neutral position under all conditions of operation.
Service Manual
LDU 20 Closed Circuit Axial Piston Transmission
Operation
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©
Danfoss | July 2017
11071687 | AX00000049en-US0202
