Sauer Danfoss 51 Series Service Manual page 7

Bent Axis Variable Displacement Motors
Functional Description (Continued)
Displacement Limiters
All Series 51 motors incorporate mechanical dis-
placement limiters. The minimum displacement of
the motor can be limited within the standard range by
a set screw in the motor housing. The maximum
displacement can be limited with spacers installed on
the servo piston.
Controls - General
A wide range of control options is available for the
Series 51 motors. These include pilot operated
Electrohydraulic 2-Position Controls, Hydraulic Pro-
portional Controls (single or two [2] connection), and
Electrohydraulic Proportional Controls. A directly op-
erated Hydraulic 2-Position Control and a Pressure
Compensator regulator are also available.
The Series 51 variable motor servo piston (except
when equipped with N2 control or the PC regulator)
may be operated either by servo pressure oil supplied
internally from the main ports of the motor, or by servo
pressure oil supplied from an external source. (The
N2 control uses servo pressure supplied by an exter-
nal control valve. The PC regulator obtains servo
pressure from the main ports of the motor.)
Orifice plugs are installed in the control spool sleeve
in the end cap to regulate the flow of oil from the servo
piston to the motor housing. Orifice plugs may be
installed in the end cap to regulate the flow of servo
pressure supply oil to the control valve, and to regu-
late the flow of oil from the control valve to the servo
piston.
10 - 3
Fig. 10-4 - Minimum Displacement Limiter
with Tamper Resistant Cap (Cartridge
Motor Configuration Shown)
Fig. 10-5 - Maximum Displacement Limiter
Screw
Fig. 10-6 - Internal Servo Pressure Supply
Screen with Multi-function Block and/or
Control Removed (Plug for External
Supply)
Fig. 10-7 - External Servo Pressure Supply
Fitting (Plug for Internal Supply)
Series 51
51000005
51000006
5100007
51000008
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