Parts & Service

If you’re dealing with a critical situation and a unit that’s down, we’ll share your sense of urgency and do whatever it takes to get your equipment up and running as fast as possible. We’ll also help troubleshoot the problem with you to find out why it occurred and help you prevent it from happening again. If you’re looking for a dependable parts supplier, we’ll partner with you to develop and maintain a cost-effective stocking inventory to support the ongoing maintenance of your compression equipment.

TrueRock supports these product lines:

  • Ajax
  • Ariel
  • Caterpillar
  • Chicago Pneumatic
  • Dresser Rand
  • Energy Industries
  • Gardner Denver
  • GE HSR
  • Gemini
  • Joy
  • Superior
  • Waukesha
  • Worthington

TrueRock takes great pride in every part we manufacture and sell. We design and build parts to OEM specifications; inspect and field-test parts before we authorize production; support our products in the unlikely event a problem occurs; and work with you to redesign parts for improved life. TrueRock’s inventory of OEM parts is one of the largest available anywhere and now includes GE high-speed reciprocating compressor parts.

Design, Engineering & Manufacturing

TrueRock parts are engineered for retrofittable fit and function. While most of our competitors use simple sketches, our team creates precise mechanical engineering drawings that guide the manufacture of every TrueRock part. We use Geometric Dimensioning & Tolerancing (GD&T) language on each drawing and identify every critical dimension to ensure the highest quality outcome, often improving upon the original design thereby increasing longevity and reliability. GD&T ensures effective and accurate communication throughout the process, from design and engineering all the way through manufacturing and inspection.

Inspection & Shipping

Our Quality Control Center inspects the parts a second time on a precision granite surface table using calibrated gauges and tools. Every TrueRock part is stamped with the proper part number and all other appropriate markings.

All parts are properly labeled, packaged and shipped along with our own custom installation instructions where appropriate.


TrueRock honors and processes all warranty claims in a timely manner. We warranty all of our parts for 18 months from the date of shipment or one year from the date of installation, whichever occurs first. We warranty that our parts are “free of defects in materials and workmanship under normal use”. For commonly purchased vendor parts, we pass the supplier’s warranty through to our customers.

Technical Support

Need to know the torque value on your connecting rod bolts? Or, the acceptable tolerance range on your crosshead pin and connecting rod bushing? Or, what parts are included in a valve kit? Answers are a phone call away. Our technical support team is available 24/7. Call 855.598.7625.

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