707‑99‑68780 Arm Cylinder Seal Kit for Komatsu PC400‑7 PC400‑8 PC450‑7 Excavator Hydraulic Repair Kit

Keywords: 707‑99‑68780, Arm Cylinder Seal Kit, Komatsu PC400‑7 Seal Kit, PC400‑8 PC450‑7 Hydraulic Repair Kit, Excavator Bucket Arm Cylinder Seal, Hydraulic Cylinder O‑ring Gasket Set, Construction Machinery Sealing Parts, Aftermarket Cylinder Overhaul Seal Kit

Product Overview

Arm Cylinder Seal Kit Part No.707‑99‑68780 is a complete hydraulic overhaul sealing kit specially developed for Komatsu PC400‑7, PC400‑8, PC450‑7 excavator arm cylinder. This repair kit includes piston seals, rod seals, wear rings, buffer seals, O‑rings and backup rings for stick cylinder assembly. It delivers reliable sealing performance for high‑pressure hydraulic oil circuit, prevents external oil leakage, internal bypass pressure loss and cylinder pressure dropping. Our aftermarket seal kit adopts high‑quality oil‑resistant rubber and PTFE composite materials, strictly manufactured and inspected according to OEM dimensional standards. It features outstanding compression set resistance, high‑pressure resistance and anti‑aging performance, suitable for heavy‑load excavation, mining and earth‑moving working conditions. It is reliable aftermarket spare part for excavator stick cylinder maintenance and complete hydraulic overhaul.

Detailed Specifications

Key Features & Advantages

• Complete Full‑Set Repair Accessories Contains all required seals for one arm cylinder overhaul, no need to source separate individual sealing parts, greatly improve on‑site repair efficiency.
• Strict OEM Dimension Compliance Every seal, wear ring and backup ring matches original groove size perfectly, direct installation without cutting, grinding or secondary modification.
• Heavy‑Duty Composite Sealing Materials Blend of high‑grade nitrile rubber and PTFE material, excellent resistance against high‑pressure hydraulic oil, wear and temperature variation.
• Superior High‑Pressure & Anti‑Aging Performance Adapt to heavy‑load continuous excavation operation, effectively reduce seal cracking, hardening and deformation, extend cylinder service cycle.
• Economical Hydraulic Repair Solution Repair leaking arm cylinder instead of purchasing expensive whole cylinder assembly, solve arm slow movement, insufficient digging force and oil spill faults, lower maintenance expense and equipment downtime.

Application Scope

Compatible Equipment List: ‑ Komatsu Excavator PC400‑7, PC400‑8, PC450‑7 using 707‑99‑68780 arm cylinder seal kit ‑ Widely used in mining site, quarry, earth‑moving project for hydraulic stick cylinder leakage troubleshooting and overhaul

Our Company Advantage

We are professional supplier of full‑range Komatsu excavator replacement spare parts. Our product range covers hydraulic seal kits, cylinder parts, engine overhaul kits, sensors, solenoid valves and other construction machinery components. ‑ Large ready stock for various Komatsu hydraulic cylinder seal repair kits ‑ Factory direct wholesale competitive price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service

Packaging & Shipping ‑

Inner waterproof sealed plastic bag to protect rubber seals away from dust, moisture and ultraviolet damage ‑ Outer reinforced export carton for long‑distance sea and land transportation ‑ Multiple shipping selections: sea freight, air freight, international express for small trial orders ‑ Export documents including Commercial Invoice, Packing List can be provided

Contact Us

If you need more Komatsu excavator seal kits, hydraulic spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.