Bucket Cylinder Seal Kit 087-6654 for CAT 322B Excavator | Hydraulic Repair Set 0876654

Restore Digging Breakout Force & Stop Bucket Cylinder Drift

Continuous heavy loading during quarrying, trenching, and earthmoving accelerates wear on internal bucket cylinder seals. When dynamic seal lips degrade, high-pressure hydraulic oil bypasses the piston head—resulting in uncommanded bucket drift, sluggish curl cycles, reduced breakout force, and messy external fluid leaks.

This heavy-duty 087-6654 hydraulic seal kit restores full internal pressure containment and structural holding force for Caterpillar 322B excavators. Precision-molded to match original OEM dimensional profiles, every seal in this pack ensures a seamless, zero-leak drop-in fitment to minimize equipment downtime.

Material & Severe-Duty Engineering

• High-Pressure Rod & Piston Seals: Precision-molded Polyurethane (PU) resists extrusion, dynamic deformation, and hydraulic shock pressure spikes up to 35+ MPa.

• Anti-Extrusion PTFE Backing Rings: Reinforced bronze-filled PTFE buffer rings safeguard primary seals against sudden pressure surges during severe digging cycles.

• Thermal-Stable Static Seals & O-Rings: High-durometer Nitrile Rubber (NBR 70°/80° Durometer) maintains constant elastic memory across broad temperature variations while resisting fluid oxidation.

• Heavy-Duty Scraper Wiper: Aggressively repels abrasive quartz sand, mud, and slurry from entering past the cylinder gland and scoring the chrome piston rod.

Target Equipment & Component Compatibility

• Machine Model: CAT 322B / 322B L Excavator

• Target Component: Bucket Cylinder Assembly

• Part Number Cross-Reference: 087-6654 / 0876654 / 087 6654

Technical Specifications

• Kit Type: Hydraulic Bucket Cylinder Overhaul / Repair Packing Pack

• Primary Materials: Polyurethane (PU), Nitrile Rubber (NBR), Industrial PTFE

• Operating Temperature Range: -30°C to 110°C (-22°F to 230°F)

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

• Installation Target: Direct replacement drop-in fit for job-site field service or shop overhauls

Fitment Verification Notice

Caterpillar 322B excavators may feature variations in bucket cylinder barrel sizes depending on linkage configuration (e.g., Reach vs. Mass Excavation linkage) and serial prefixes. Prior to ordering, verify the part number stamped on your cylinder head gland or cross-reference 087-6654 / 0876654 in your CAT parts manual.