OEM replacement hydraulic cylinder for EQ Systems AJ and CJ series tube-in-tube jack legs. 24" stroke. SAE fittings. Direct drop-in replacement for the AJ/CJ series.
The EQ Systems 2505 is the OEM replacement hydraulic cylinder for AJ and CJ series tube-in-tube jack legs with a 24" stroke. When internal cylinder seals wear out — causing a jack leg to drift from position, lose lifting force, or fail to hold under load — replacing the cylinder restores the jack to full operating condition without replacing the entire assembly.
The AJ series is EQ Systems' hydraulic trailer jack platform, designed for bumper pull, horse, livestock, and equipment trailer applications. The 2505 uses SAE straight thread O-ring fittings throughout, consistent with the AJ/CJ series hydraulic plumbing standard. At 39 lbs, this is a substantial cylinder suited to the heavy-duty demands of the AJ/CJ jack platform.
The 2505 is a direct replacement for AJ and CJ series jack legs with a 24" stroke. AJ/CJ cylinders are not interchangeable with AM, SM, or CT series cylinders — series differ in bore size, dimensions, and fitting configuration. Use the Hydraulic Cylinder Identification Chart for Tube-in-Tube Jacks available through EQ Systems service and support documentation to confirm the correct cylinder for your jack, or contact EQ Systems technical support with your jack model number.
The 2505 cylinder uses SAE straight thread O-ring fittings exclusively. This is consistent with the AJ and CJ series hydraulic plumbing standard. When reconnecting hydraulic hoses after cylinder replacement, ensure all SAE fittings are properly seated with undamaged O-rings to prevent leaks. Replace any O-rings that show signs of wear, cracking, or deformation during reassembly.
Have your jack model number ready when contacting EQ Systems support. EQ Systems provides a Hydraulic Cylinder Identification Chart for Tube-in-Tube Jacks and an AJ 7500 identification chart through their service and support documentation to help confirm the correct part. Technical Support: EQ Systems Toll Free: 1-800-846-9659 Local: 574-264-3437 Hours: Monday–Friday, 7AM–4PM EST Manufacturer: EQ Systems — 19300 Grange St, Cassopolis, MI 49031