31Y1-28960 Boom Cylinder Seal Kit — Product Overview

The 31Y1-28960 Boom Cylinder Seal Kit is a precision-engineered aftermarket replacement for Hyundai R210LC-9, R215-9, R225-9, R235LC-9, and R220LC-9S excavators. Designed for the boom cylinder with 85mm rod diameter, this kit is manufactured to original OEM dimensional specifications using premium sealing materials etc.

The boom cylinder carries the full weight of the excavator’s front attachment — arm, bucket, and payload — through every lift cycle. Seal integrity is critical for maintaining lifting power, preventing boom drift, and avoiding hydraulic oil leaks that compromise jobsite safety and environmental compliance.

DJF Seals supplies the 31Y1-28960 kit at factory-direct wholesale pricing. Each kit undergoes dimensional inspection before shipment, ensuring consistent quality for Hyundai equipment dealers, independent repair centers, and construction fleet maintenance teams.

Technical Specifications

Compatible Models

• Hyundai R210LC-9 — Boom Cylinder
• Hyundai R215-9 — Boom Cylinder
• Hyundai R225-9 — Boom Cylinder
• Hyundai R235LC-9 — Boom Cylinder
• Hyundai R220LC-9S — Boom Cylinder

Key Features & Benefits

• 85mm Rod Precision — Manufactured to exact OEM dimensional tolerances. Direct drop-in replacement for Hyundai 31Y1-28960.
• Boom-Duty Durability — Polyurethane rod seal and buffer ring withstand the high-pressure lift cycles and shock loads characteristic of Hyundai 20-ton class excavator boom operation.
• 5-Model Coverage — One kit supports R210LC-9, R215-9, R225-9, R235LC-9, and R220LC-9S. Simplifies inventory for multi-model fleet owners and parts distributors.
• Premium Materials — Uses sealing compounds comparable to OE specifications. Superior resistance to Hyundai OEM hydraulic fluid and operating temperatures.
• Factory-Direct Supply — Wholesale pricing with flexible MOQ. Sample orders accepted for quality verification before bulk purchase.