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Piston Pump Product Guide

Brands We Repair:

  • Denison
  • Oilgear
  • Racine
  • Rexroth
  • Vickers
  • and many more

What They Do:

Piston pumps, as used in hydraulic systems, and
they create a flow by pistons moving in and out of
cylinder bores as the latter pass over inlet and
outlet ports. The stroke is imparted to the pistons
either by having the cylinder barrel set at an angle
to the drive shaft or by means of a swashplate
mounted on the drive shaft.

Primary Types and How They Work:


Axial Piston Pump:

An axial piston pump is a positive displacement pump
that has a number of pistons in a circular arrangement
within the cylinder block. They can be used as a
stand-alone pump, a hydraulic motor or with a type
of compressor.


Radial Piston Pump:

Radial Piston Pumps can produce a very smooth
flow under extreme pressure. Generally they are
variable-displacement pumps. In variable pumps,
flow rate changes when the shaft holding the rotating
pistons is moved with relation to the casing (in different models either the shaft or the casing moves.) Output can also be varied by changing the rotation speed.


Combination Pump:

A Combination Pump consists of a external gear pump and a radial piston pump with constant pumping displacement. The radial piston pump is coupled with a flange and a coupling onto
the primary gear pump.


Repair Procedures:

  • Every piston pump is assembled from cylinder blocks, valve plates, and piston shoe subassemblies that have been checked and/or remanufactured to exact tolerance.
  • Every cylinder block has each bore diameter checked including its concentricity to ensure pump efficiency.
  • Every cylinder block face is machine lap polished to 12 millionths of flatness and is surface treated to allow a thin layer of oil to exist between mated parts.
  • Every valve plate is machine lap polished to 12 millionths of flatness.
  • Every metering and timing notch on the plate is checked and any found out of tolerance are cut to meet specifications.
  • The plate is surface treated to ensure no internal slippage.
  • Every piston shoe subassembly diameter is matched with cylinder bore diameters to ensure efficiency within manufacturer's tolerances.
  • Piston shoe height is checked on each shoe using a micrometer to ensure the component is within tolerance.


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Paragon Technologies
Paragon Canada
Paragon Atlantic
Paragon Pacific

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