TSE DPT60, Owner'S Manual

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5
Series 90 Functional Description
Functional Description
This section describes the operation of pumps, motors, and their various serviceable features. It is a useful reference for
readers unfamiliar with the functioning of a specific system.
General Description and Cross Sectional Views
P001 413E
Series 90 Variable Displacement Pump (PV)
Series 90 Fixed Displacement Motor (MF)
90000347
F000 539
Series 90 PV Cross Section
Variable Displacement Pumps
The Variable Displacement Pump (PV) is designed to
convert an input torque into hydraulic power. The input
shaft turns the pump cylinder which contains a ring of
pistons. The pistons run against a tilted plate, called the
swashplate. This causes the pistons to compress the
hydraulic fluid which imparts the input energy into the
hydraulic fluid. The high pressure fluid is then ported out
to provide power to a remote function.
The swashplate angle can be varied by the control piston.
Altering the swashplate angle varies the displacement of
fluid in a given revolution of the input shaft.
Fixed Displacement Motor
The Fixed Displacement Motor (MF) is designed to
convert an input of hydraulic power into an output torque.
It operates in the reverse manner of the pump. The high
pressure hydraulic fluid enters through the input port. The
fluid pressure builds behind the pistons causing them to
move down the swashplate (the path of least resistance).
As the piston returns up the swashplate again, the fluid is
allowed to exit through the exit port. The spinning pistons
are housed in a cylinder which is connected to the output
shaft. The output torque can be applied to a mechanical
function.
Slider Block
Servo Piston
Servo Arm
Servo Valve
Cradle Bearing
Cradle Hold Down
Charge Pump
Cradle Leveler
Cradle
Cradle Guide
Feed Back