Boom Cylinder Seal Kit 707-99-67870 for Komatsu PC300LL PC400 PC550 Excavator
Boom Cylinder Seal Kit 707-99-67870 for Komatsu PC300LL PC400 PC550 Excavator
Available in stock
Product Description
Part Name: Boom Cylinder Seal Kit
Part Number(s): 707-99-67870
Brand Compatibility: Komatsu
Machine Type: Hydraulic Excavator
Component: Boom Hydraulic Cylinder
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging and reliable international delivery within 2–7 business days.
The 707-99-67870 Boom Cylinder Seal Kit is manufactured to OEM specifications for the boom hydraulic cylinder fitted to selected Komatsu PC300LL, PC350LL, PC390LL, PC400, PC450 and PC550 excavators. This complete hydraulic cylinder overhaul kit contains precision-engineered rod seals, piston seals, wear rings, guide rings, backup rings, O-rings and dust seals required to restore hydraulic sealing performance, eliminate hydraulic oil leakage and maintain optimum operating pressure. Manufactured from premium sealing materials, it is designed to withstand the demanding operating conditions encountered in construction, forestry, quarrying, mining and heavy earthmoving applications.
The boom hydraulic cylinder raises and lowers the excavator boom, allowing the machine to perform heavy lifting, trenching, loading and excavation operations efficiently. Continuous operation under high hydraulic pressures, heavy structural loads and harsh working environments gradually wears the cylinder seals. Damaged seals can result in hydraulic oil leakage, boom drift, reduced lifting capacity, slower hydraulic response and internal pressure bypass. Replacing the complete seal kit restores sealing integrity, improves hydraulic efficiency and helps maximise machine uptime while protecting internal cylinder components.
Typical Applications
Construction • Earthmoving • Forestry • Logging • Mining • Quarrying • Civil Infrastructure • Heavy Excavation • Material Handling
Common Symptoms
- Hydraulic oil leakage from the boom cylinder
- Boom drifting while raised
- Reduced boom lifting capacity
- Slow boom lifting or lowering
- Internal hydraulic pressure bypass
- Difficulty maintaining boom position
- Reduced hydraulic efficiency and productivity
Cross-Reference Part Numbers
OEM Part Number: 707-99-67870
Compatible Models
Hydraulic Excavators: Komatsu PC300LL, PC350LL, PC390LL, PC400, PC450 and PC550.
Fitment Note
Please verify the OEM part number, machine model, serial number and boom hydraulic cylinder assembly before ordering. Komatsu may use different boom 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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Does IMARA Engineering Supplies offer international shipping?
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