Hydraulic Main Pump Seal Kit 200-3366 for CAT 322C Excavator | Repair Set 2003366

Eliminate Main Pump Pressure Drops & Stop External Oil Leaks

The hydraulic main pump is the core power unit of your CAT 322C excavator. When internal dynamic seals and casing gaskets degrade under constant high system pressure, fluid bypass occurs—resulting in slow hydraulic cycles, overheating oil, loss of digging breakout force, and external housing leaks.

This heavy-duty 200-3366 main pump seal kit delivers exact pressure containment and fluid isolation for Caterpillar 322C main hydraulic pump groups. Engineered to exact factory tolerances, every seal in this overhaul set guarantees a precise, zero-leak drop-in fitment to minimize equipment downtime.

High-Velocity & Thermal Engineering Materials

• High-Temperature FKM (Viton) Rotary Shaft Seals: Spring-loaded fluorocarbon seal lips maintain continuous radial pressure against the rotating drive shaft, preventing oil blow-by and resisting lip carbonization at continuous high operating temperatures exceeding 120°C.

• High-Modulus Polyurethane (PU) Dynamic Rings: Formulated to withstand sudden hydraulic pressure spikes and intense cyclic fatigue without structural extrusion or deformation.

• Static Housing & Swashplate O-Rings: Premium-grade Nitrile Rubber (NBR 70°/80° Durometer) seals prevent internal fluid cross-contamination and ensure tight static sealing across pump body split lines and control valve blocks.

• Contamination Defense: Secondary wiper and backup elements isolate internal swashplate bearings, pistons, and valve plates from external dust, moisture, and fine metal debris.

Target Equipment & Component Compatibility

• Machine Model: CAT 322C Hydraulic Excavator

• Target Assembly: Hydraulic Main Pump / Primary Rotary Group

• Part Number Cross-Reference: 200-3366 / 2003366 / 200 3366

Technical Specifications

• Kit Type: Hydraulic Main Pump Overhaul / Rebuild Seal Pack

• Primary Materials: High-Spec Fluorocarbon (FKM / Viton), 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 pump servicing or full shop rebuilds

Fitment Verification Notice

Caterpillar 322C main pumps may vary depending on equipment serial prefixes and pump manufacturer sub-assemblies. Prior to ordering, check the serial tag or part number stamped directly on your main pump housing, or cross-reference 200-3366 / 2003366 in your CAT parts manual.