We Are the North American Distributor of DO Engineering Vacuum Pump

CSR Suspension is the official North American distributor for DO Engineering vacuum pumps and oil filling machines! If you are looking to take your business to the next level, consider investing in one of these essential tools!

Filling a shock absorber (damper) with oil is a messy and time consuming job, and in the end of all that effort, the shock absorber still has quite some air left in it. Specialists fine-tune their shock absorbers constantly, changing shim settings or adjusters to achieve the maximum performance. However they tend to forget that they already started with a badly filled shock absorber in the first place, highly limiting the shock absorber performance and durability. Filling a shock absorber by hand will always leave air inside the shock absorber, the air gets stuck within little corners and confined areas inside the shock absorber, moreover the oil itself that is poured into the shock absorber contains air.

The effects of air inside a shock absorber should not be underestimated, air is compressible and because of this heavily effects damping. On top of this problem, air also causes damper fading (air expands when damper is heating up), foaming, cavitation, damper noise and oxidation (ageing) of the oil. To tackle these problems all together, DO Engineering has developed the oil filling machines XP and LT that use cycles of high vacuum and pressure, that allows you to fill a shock absorber and other suspension related products quickly, without spilling oil, and most important : without large amounts of air trapped inside the shock absorber! The oil filling process with the DO Engineering oil filling machines is fully reproducible, so no need to wonder if the change in damping is from the amount of air left in your shock absorber or the changes you made to the shim stack. The DO Engineering oil filling machines are designed to be fully compatible with virtually all shock absorber brands and shock absorber types. DO Engineering develops and builds the oil filling machines in house and sells the oil filling machines worldwide. The DO Engineering oil filling machines are used in all major racing classes including F1, Moto GP, WRC, MX1 etc.

Key advantages using the DO Engineering oil filling machines:

  • Saves a lot of time (filling process only ±3 min. for medium size shock absorber)
  • Increases shock absorber performance
  • Increases shock absorber durability
  • Decreases damper noise
  • More constant damping (less damping loss under high temperatures)
  • Reproducible oil filling quality
  • No messing around with oil
  • Professional appearance

Key features of the DO Engineering oil filling machines:

  • Highest quality
  • Excellent performance
  • Compact / Low weight
  • Portable
  • Versatile/flexible
  • Suitable for virtually all shock absorber types and brands
  • Safe to use
  • Simple to operate
  • Fully maintainable / Oil reservoir cleanable
  • Comes with extensive owners manual, full color, in English, (±120 pages!)
  • Expandable with options
  • Custom developments possible

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CSR Suspension has provided the finest motorcycle suspension services for more than 20 years. Check out our catalog!