6805399 Arm Extendable Cylinder Seal Kit — Product Overview

The 6805399 Arm Extendable Cylinder Seal Kit is a precision aftermarket replacement for the Bobcat 430 excavator. Designed specifically for the extendable arm cylinder with 1-1/2″ rod and 2-1/4″ bore dimensions, this kit matches Bobcat OEM specification 6805399.

The Bobcat 430 is a 4-5 ton class compact excavator popular in urban construction, utility work, and landscaping. Its extendable arm feature allows the operator to hydraulically increase reach for deeper trenching without repositioning the machine. The extendable arm cylinder operates as a telescoping mechanism — extending and retracting the inner arm section inside the outer boom. Seal failure causes arm creep (the arm slowly retracts under load), loss of precise reach control, and hydraulic oil leakage at the cylinder gland.

The 6805399 kit uses polyurethane rod seals for the sliding wear pattern of telescoping mechanisms and NBR static seals etc for reliable containment. DJF Seals supplies this kit at factory-direct wholesale pricing.

Technical Specifications

Compatible Models

• Bobcat 430 — Arm Extendable Cylinder

Key Features & Benefits

• Telescoping-Specific Design — 1-1/2″ rod × 2-1/4″ bore. Engineered for the sliding wear pattern unique to extendable arm telescoping mechanisms.
• Reach-Precision Sealing — PU rod seal maintains cylinder position for precise arm extension control, preventing arm creep during trenching and deep excavation.
• Complete Reseal Kit — Rod seal, piston seal, wiper, O-rings, and backup rings included for a full extendable arm cylinder rebuild.
• 5-Ton Class Tough — Materials selected for the duty cycles and working pressures of the Bobcat 430 compact excavator platform.
• Factory-Direct Wholesale — Competitive pricing with flexible MOQ. Sample orders accepted for quality verification.