6661051 Boom Cylinder Seal Kit — Product Overview

The 6661051 Boom Cylinder Seal Kit is a precision aftermarket replacement for the Bobcat 231 compact excavator. Designed specifically for the boom cylinder — the primary lifting mechanism — this kit features 1-3/4″ rod and 3-1/4″ bore dimensions, matching Bobcat OEM part number 6661051.

The boom cylinder supports the full weight of the excavator’s arm, bucket, and payload through every lift cycle. Seal degradation leads to boom drift, reduced lifting capacity, and hydraulic fluid contamination. The 6661051 kit uses high-grade polyurethane for the rod seal (maximum abrasion resistance), PTFE for the backup rings (extrusion prevention), and NBR for static seals etc — materials selected for the demanding duty cycles of compact excavator operation.

DJF Seals supplies this kit at factory-direct wholesale pricing. Each kit undergoes dimensional inspection before shipment, ensuring consistent quality for equipment rental fleets, independent Bobcat repair specialists, and international parts distributors.

Technical Specifications

Compatible Models

• Bobcat 231 — Boom Cylinder

Key Features & Benefits

• Boom-Specific Engineering — 1-3/4″ rod × 3-1/4″ bore, matched to the 231’s boom cylinder dimensions. Direct drop-in replacement for 6661051.
• Lift-Cycle Durability — PU rod seal and buffer ring withstand repetitive high-pressure lift cycles and shock loads during excavation and material handling.
• Complete Kit — Rod seal, piston seal, wiper, O-rings, and backup rings included. Everything needed for one full boom cylinder reseal.
• Leak Prevention — PTFE backup rings protect against extrusion under maximum boom lift pressure; NBR O-rings maintain consistent compression set over extended service intervals.
• Factory-Direct Value — Wholesale pricing with flexible MOQ. Sample orders accepted for quality verification before bulk purchase.