Hydraulic Motor Repair: A Quick Run-Down

Here at Rush we can take in and repair a variety of hydraulic motors. We’re familiar fixing and maintaining hydraulic motors from companies like Bosch Hydraulics and SKF Lubrication.

And our expertise and knowledge of hydraulic products is fully tapped into when it comes to the repair of hydraulic motors.Hydraulic Motor

A brief introduction to hydraulic motors

Hydraulic motors operate using pressurized hydraulic fluid. This fluid is vital for the operation of a hydraulic motor, as it transfers power between the motor’s pistons and turns the motor, giving it a greater output of force as well as taking less power to start the motor up. Think of the fluid as a replacement for levers and gears – in fact, the process by which fluid acts in place of these hard pieces of equipment is called, simply enough, mechanical replacement.

Your basic type of hydraulic motor consists of a pair of pistons that are separated by tubes containing hydraulic fluid. This means that when one of the pistons moves or shifts, the fluid is displaced, and the pressure from that piston along with the pressure from the hydraulic fluid is then transferred to the second piston, making it turn as well and bringing the motor to life.

All hydraulic motors are recognizable by their common features:

  • Their surface area is affected by the pressure differential (i.e., two separate but related pressures from the hydraulic fluid)
  • Some way of controlling how the hydraulic fluid interacts with the motor surface
  • A link between the surface and output shaft

What’s more, hydraulic motors also have shared factors that dictate how well they perform:

  • How well the surface area stands up to force
  • Leakage of hydraulic fluid
  • How sturdy and reliable the link between the output shaft and pressure surface is

Ok, so that’s a basic rundown of hydraulic motors, and how they should work. But what are some common problems and the way they’re repaired here at Rush Hydraulic?

Seal leakage

Seals are used to keep the hydraulic fluid pressure contained. They’re a key part of a hydraulic motor. But they can leak. At Rush, we’ll determine how tight each seal is under pressure. If they’re not performing as they should, we’ll find a high-quality replacementthat is a perfect fit.

Pressure fittings

A hydraulic motor has two pressure fittings – one for each hydraulic line that has fluid entering and then leaving the motor. But while built from strong stainless steel alloy, these fittings can degrade at their attachment points. We can replace weakened fittings, and advise you on whether your hydraulic line may also need replacement.


The most easily spotted part of a hydraulic motor, pistons must operate within the cylinder with precise levels of tolerance, as any wavering will bring a loss of hydraulic pressure. Depending on the level of damage, Rush may be able to physically repair a damaged piston or cylinder. However, given the high level of precision such items need, it’s almost always better to replace them outright – something Rush can service you with.