Arm Cylinder Seal Kit 707-99-68780 for Komatsu PC400 PC450 PC600 Excavator
Arm Cylinder Seal Kit 707-99-68780 for Komatsu PC400 PC450 PC600 Excavator
Available in stock
Product Description
Part Name: Arm Cylinder Seal Kit
Part Number(s): 707-99-68780
Brand Compatibility: Komatsu
Machine Type: Hydraulic Excavator
Component: Arm (Stick) Hydraulic Cylinder
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging and reliable international delivery within 2–7 business days.
The 707-99-68780 Arm Cylinder Seal Kit is manufactured to OEM specifications for the arm (stick) hydraulic cylinder fitted to selected Komatsu PC400-7, PC400LC-7, PC400-8, PC450-8, PC450LC-8, PC490LC-10, PC600-7 and PC600LC-7 excavators. This complete hydraulic cylinder overhaul kit includes precision-engineered rod seals, piston seals, wear rings, guide rings, backup rings, O-rings and dust seals engineered to restore hydraulic sealing performance, eliminate oil leakage and maintain optimum cylinder pressure. Manufactured from premium sealing materials, it provides dependable sealing performance under the severe operating conditions encountered in construction, mining, quarrying and heavy earthmoving.
The arm hydraulic cylinder controls the extension and retraction of the excavator stick, providing the reach, digging force and attachment control required for excavation, trenching, grading and loading operations. Continuous operation under high hydraulic pressures, heavy breakout forces and abrasive site conditions gradually wears the cylinder seals. Damaged seals can cause hydraulic oil leakage, stick drift, reduced digging force, slow cylinder response and internal hydraulic pressure bypass. Replacing the complete seal kit restores hydraulic efficiency, improves machine control, protects internal cylinder components and helps minimise costly downtime.
Typical Applications
Construction • Earthmoving • Mining • Quarrying • Civil Infrastructure • Road Construction • Heavy Excavation • Demolition • Material Handling
Common Symptoms
- Hydraulic oil leakage from the arm cylinder
- Stick drifting during operation
- Reduced digging force
- Slow arm extension or retraction
- Internal hydraulic pressure bypass
- Difficulty maintaining arm position
- Reduced hydraulic system efficiency
Cross-Reference Part Numbers
OEM Part Number: 707-99-68780
Compatible Models
Hydraulic Excavators: Komatsu PC400-7, PC400LC-7, PC400-8, PC450-8, PC450LC-8, PC490LC-10, PC600-7 and PC600LC-7.
Fitment Note
Please verify the OEM part number, machine model, serial number and arm hydraulic cylinder assembly before ordering. Komatsu may use different arm cylinder configurations depending on the machine model, production series and serial number. Contact Imara Engineering Supplies if you require assistance confirming compatibility.
Technical Specifications
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