Designed to Perform. Built to Last.

Gresen pumps have been a hydraulics industry workhorse for many years and are built to stand up to the toughest operating environments. With displacements ranging from .577 to 4.62 cubic inch per revolution and continuous operating pressures up to 1500 pounds per square inch, Gresen pumps are ideal for a wide variety of applications.

TC Cam-Ring

One of the secrets to this pump’s toughness lies in its special cam-ring. The cam-ring is one of the most critical components in a vane pump – the life of the pump is directly related to how well the cam-ring handles wear, heat and contamination.

A proprietary mix of materials in combination with special heat treatment procedures makes the most durable cam-ring available. This special mix, in the words of the metallurgist, creates an extremely uniform metalurgical microstructure resulting in excellent wear characteristics.

SINCE 1968

A lot of years have passed since we began servicing the hydraulic industry, and we’ve amassed an impressive amount of knowledge since that time.


We maintain a huge inventory, and offer same-day shipping on in-stock orders up to 5:00 p.m. EST, with expedited delivery at no extra charge.

Highest Quality

Our components are always engineered to your precise specifications, resulting in productive machine uptime and much longer meantime between failures.


CRS Service, Inc. has been a manufacturer and distributor of high quality replacement pumps and components for the global hydraulic industry since 1968.

Contact Us


Rochester Hills, MI
800-277-8830  |  248-652-9940


Harrison, OH
800-277-8840  |  513-367-3800


Fort Worth, TX
800-277-8842  |  817-590-2236