The CAT 266-8016 Arm Cylinder Seal Kit provides a complete hydraulic cylinder repair solution for Caterpillar 325D and 329D series excavators. Precision-matched for a 150mm bore and 105mm rod diameter, this kit combines TPU, PTFE, carbon-filled PTFE, and nitrile (NBR) components for reliable high-pressure performance in demanding digging operations.

Technical Specifications

Seal Kit Composition

Compatible Caterpillar Models

• 325D / 325D L / 325D LN
• 329D / 329D L
• Compatible with Standard Arm and Long Reach Arm configurations

FAQ

Q: Can I use this kit for a CAT 325C arm cylinder?
A: No. The 266-8016 kit is specifically engineered for the 325D and 329D series which use a 105mm rod. Older 325C models typically utilize different cylinder dimensions (often 95mm or 100mm rods). Always cross-reference the machine serial number before purchase.

Q: What is the benefit of the carbon-filled PTFE guide rings in this kit?
A: Arm cylinders are prone to heat buildup due to constant movement. Carbon-filled PTFE guide rings offer superior thermal stability and self-lubrication compared to standard nylon rings, preventing stick-slip behavior and extending the intervals between maintenance.