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Piston Motor Product Guide

Brands We Repair:

  • Bosch
  • Char-Lynn
  • Denison
  • Moog
  • Racine
  • Rexroth
  • Vickers
  • and many more

What They Do:

A Piston Motor converts hydraulic energy into
rotating motion by being pushed by hydraulic fluid.
Piston motors will product equal torque and speed in
either rotation, and can operate with high pressure
on either or both ports at the same time.

Primary Types and How They Work:

Construction of a piston motor is similar to that of
piston pumps. Some piston pumps will act as motors
without modifications. As a motor, the pistons push
against a circular ramp, (cam plate) to produce rotary
motion on the shaft.

Radial Piston Motor:

A radial piston motor operates just the opposite of the
radial piston pump. In a radial piston pump, the cylinder
block rotates, the pistons press against the rotors are
forced in and out of the cylinders, then receiving fluid
and pushing it into the system. In the radial motor, fluid
is forced into the cylinders and drives the pistons outward.
The pistons pushing against the rotor cause the cylinder block to rotate.


MHT Motor:

MHT motors provide variable power throughout their entire pressure and speed range, and perform efficiently in either direction of rotation.


Bent Axis Motor:

A bent axis pump having a port in the housing which the port is movable to vary the displacement of the pump and including leak-proof transfer sleeves extending between the port and the housing to effect flow of fluid between the pump housing and port.


Repair Procedures:

  • All depth of metering, timing notches, lubrication grooves and seal grooves are checked. Those that are not in tolerance are recut as needed.
  • The plate surface is treated with a nitrate coating that ensures low leakage, high torque capability, longer service life and even increased cycle times in many applications.
  • Every cam ring inside contour is refinished using a series of polishing wheels that follow the contour to smooth out even the slightest surface imperfections without changing the slope and dwell angles (that retain perfect vane stability).
  • The case hardened ring has more than enough surface treatment to withstand
    this polishing.
  • After the surface is polished a severe duty proprietary coating is applied to the inside ring contour to reduce ring wear and lengthen its service life.
  • All vanes are checked with a micrometer for thickness. Each set is refinished as a group to ensure they are all the same length.
  • Vane tip-to-ring surfaces are restored to provide a proper vane-to-tip wear pattern.
  • Every motor that Paragon remanufactures is assembled using new springs and rotors that ensure the proper load on the vanes as well as the proper vane slot dimensions.


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Paragon Technologies
Paragon Canada
Paragon Atlantic
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