Center Joint Seal Kit 8U5852 2922771 2501047 for CAT M313C M315C M316C M318C Wheeled Excavators

Restore Travel Power & Eliminate Swivel Joint Fluid Bypass

The center joint (swivelmanifold / turning joint) transfers high-pressure hydraulic fluid from the upper structure to the lower chassis, driving the travel motors, steering cylinders, and outriggers. When internal rotary seals wear down under continuous upperhouse turning, fluid bypasses internal ports—causing sluggish wheel drive, steering power loss, brake delay, and external chassis leaks.

This heavy-duty center joint seal kit delivers exact pressure containment and fluid port isolation for Caterpillar C-Series wheeled excavators. Precision-molded to match original factory tolerances, every seal in this pack ensures zero-leak, drop-in performance for field overhauls or shop servicing.

Multi-Port Rotary Seal Engineering

• Low-Friction PTFE Step Seals & Glyd Rings: High-spec bronze-filled PTFE seals provide smooth, low-torque 360-degree continuous rotation without stick-slip friction, preventing port-to-port pressure loss.

• High-Durometer NBR Energizers & O-Rings: Premium Nitrile Rubber O-rings maintain constant radial force against the inner rotor stem across broad operating temperature shifts (-30°C to 110°C).

• Polyurethane (PU) Casing & Wiper Seals: Outer scraper elements and casing rings block road grit, washdown slurry, and dust from entering the swivel housing and scoring internal port journals.

• Fluid Isolation Protection: Isolates individual supply lines (steering, travel forward/reverse, outriggers, blade) to maintain full working pressure at the wheels.

Target Equipment & Component Compatibility

• Machine Models: CAT M313C, CAT M315C, CAT M316C, CAT M318C Wheeled Excavators

• Target Assembly: Center Joint / Swivel Joint / Turning Joint Group

• Part Number Cross-Reference: 8U5852 / 2922771 / 2501047 / 8U7966 (8U-5852, 292-2771, 250-1047, 8U-7966)

Technical Specifications

• Kit Type: Center Joint / Rotary Swivel Overhaul Seal Pack

• Primary Materials: Bronze-Filled PTFE, Premium Polyurethane (PU), Industrial NBR Rubber

• Fluid Compatibility: ISO VG 32/46/68 mineral-based hydraulic oils and synthetic fluids

• Application Target: Direct-fit replacement for field servicing or full shop swivel rebuilds

Fitment Verification Notice

Caterpillar wheeled excavators use various center joint configurations depending on outrigger, dozer blade, and steering options. Before ordering, verify the part number stamped on your center joint housing or cross-reference 8U5852, 2922771, 2501047, or 8U7966 in your CAT parts manual.