6818258: Hydraulic Cylinder Seal Kit for Bobcat Excavator 337G / 337WG / 341G Swing
6818258 Swing Cylinder Seal Kit — Product Overview
The 6818258 Swing Cylinder Seal Kit is a precision aftermarket replacement for Bobcat 337G, 337WG, and 341G excavators. Designed for the swing (boom offset) cylinder, this kit is manufactured to OEM dimensional specifications using premium sealing materials etc.
The swing cylinder on the 337G/341G platform enables lateral boom offset — critical for trenching parallel to the tracks, working alongside structures, and maximizing reach in confined job sites. Unlike lift cylinders that see primarily axial loads, swing cylinders on heavy-class excavators endure complex combined loading: axial pressure during offset positioning plus significant lateral forces as the heavy boom and arm assembly pivots.
Seal failure causes swing drift (the boom creeps out of offset position), imprecise offset control during precision excavation, and hydraulic oil leaks at the cylinder gland. The 6818258 kit uses polyurethane rod seals for the sliding wear characteristic of swing cylinder operation and NBR static seals etc for reliable containment. DJF Seals supplies this kit at factory-direct wholesale pricing.
Technical Specifications
| Parameter | Specification |
| OEM Part Number | 6818258 |
| Compatible Brand | Bobcat |
| Cylinder Application | Swing Cylinder (Boom Offset) |
| Applicable Models | 337G, 337WG, 341G |
| Material | Polyurethane, NBR, PTFE etc |
| Condition | New, Aftermarket Replacement |
| Business Type | Factory Direct Wholesale |
Compatible Models
- Bobcat 337G — Swing Cylinder (Boom Offset)
- Bobcat 337WG — Swing Cylinder (Boom Offset)
- Bobcat 341G — Swing Cylinder (Boom Offset)
Key Features & Benefits
- Heavy-Class Swing Precision — Engineered for the combined axial and lateral loading unique to boom swing/offset cylinders on 30-40+ ton class excavators.
- Anti-Drift Performance — Polyurethane rod seal maintains cylinder position under sustained offset loading, preventing boom creep during precision excavation in confined spaces.
- Contamination Defense — Wiper seal protects the rod from dirt and debris ingress during offset positioning, extending seal service life in harsh job site conditions.
- Complete Reseal Kit — Rod seal, piston seal, wiper, O-rings, and backup rings included for a full swing cylinder rebuild.
- Factory-Direct Wholesale — Competitive pricing with flexible MOQ. Custom packaging and private labeling available for distributors.