The 4-way spool valve shifts the servo supply pressure to change the motor displacement. The servo
supply pressure can be external or internal.
Series 51 motor cross section
Servo
piston
Charge pressure relief valve
Piston
Synchronizing shaft
Tapered roller bearings
Bearing
plate
Valve segment
Hydraulic proportional
control
Minimum displacement
liter
P101 173E
Speed pickup ring
SAE-Flange
Speed sensor
4-way
valve
Series 51-1 motors
Series 51-1 motors feature simplified end cap and control components. The servo piston in the Series
51-1 has a differential area of 2 to 1. The connecting joint is designed to decrease the overall length of the
motor.
The Series 51-1 control feeds servo pressure directly to the servo piston. Low system loop pressure for
two-position controls, and high system loop pressure for pressure compensating controls actuates the
servo piston.
Rotating hardware and housing components are common between Series 51 and Series 51-1.
Service Manual
Series 51 and 51-1 Motors
Introduction
8 |
©
Danfoss | March 2016 11008567 | AX00000013en-US0202
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