Arm Boom Cylinder Seal Kit 707-99-67090 for Komatsu PC300 PC400
Arm Boom Cylinder Seal Kit 707-99-67090 for Komatsu PC300 PC400
Available in stock
Product Description
Part Name: Arm & Boom Cylinder Seal Kit
Part Number(s): 707-99-67090
Brand Compatibility: Komatsu
Machine Type: Hydraulic Excavator
Component: Arm (Stick) Hydraulic Cylinder / Boom Hydraulic Cylinder
Rod Diameter: 110 mm
Cylinder Bore: 160 mm
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging and reliable international delivery within 2–7 business days.
The 707-99-67090 Arm & Boom Cylinder Seal Kit is manufactured to OEM specifications for selected Komatsu PC300-7, PC300-8, PC300LC-7, PC300LC-8, PC340LC-7, PC400-7 and PC400LC-7 excavators. This complete overhaul kit contains the seals, wear rings, backup rings, guide rings and O-rings required to restore the sealing performance of compatible arm (stick) cylinders and boom cylinders, depending on the hydraulic cylinder assembly fitted to the machine. Designed for cylinders with a 110 mm piston rod and 160 mm bore, it restores hydraulic efficiency, prevents internal and external oil leakage and extends cylinder service life.
On PC300-series excavators, this seal kit is commonly used for arm (stick) cylinders, which control stick extension and retraction during digging, trenching and loading. On selected PC400-series machines, the same OEM seal kit is used in boom cylinders, which raise and lower the excavator's main boom during heavy lifting and excavation. This shared application is possible because the cylinders use the same sealing profile and dimensions, although compatibility depends on the cylinder assembly and machine serial number.
Typical Applications
Construction • Earthmoving • Mining • Quarrying • Demolition • Civil Infrastructure • Road Construction • Heavy Excavation • Material Handling
Common Symptoms
- Hydraulic oil leakage from the arm or boom cylinder
- Arm or boom drifting under load
- Reduced digging or lifting performance
- Slow cylinder extension or retraction
- Internal hydraulic pressure bypass
- Reduced holding force
- Premature cylinder wear due to damaged seals
Cross-Reference Part Numbers
OEM Part Number: 707-99-67090
Compatible Models
Hydraulic Excavators: Komatsu PC300-7, PC300-8, PC300LC-7, PC300LC-8, PC340LC-7, PC400-7 and PC400LC-7.
Fitment Note
Please verify the OEM part number, machine model, serial number and hydraulic cylinder assembly before ordering. 707-99-67090 is used on both arm (stick) cylinders and boom cylinders depending on the excavator model and cylinder configuration. Confirm the cylinder assembly or contact Imara Engineering Supplies for assistance before purchase.
Technical Specifications
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