boom-cylinder-seal-kit-707-99-67120-komatsu-pc400-pc450-excavator
boom-cylinder-seal-kit-707-99-67120-komatsu-pc400-pc450-excavator
Available in stock
Product Description
Part Name: Boom Cylinder Seal Kit
Part Number(s): 707-99-67120
Brand Compatibility: Komatsu
Machine Type: Hydraulic Excavator
Component: Boom Hydraulic Cylinder
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging, reliable international logistics and estimated delivery within 2–7 business days.
The 707-99-67120 Boom Cylinder Seal Kit is manufactured to OEM specifications for the boom hydraulic cylinder fitted to selected Komatsu PC400-5, PC400LC-5, PC450-6 and PC450LC-6 excavators. Designed for hydraulic cylinders with a 110 mm piston rod and 160 mm bore, this complete overhaul kit contains the seals, wear rings, backup rings, guide rings and O-rings required to restore hydraulic sealing, maintain operating pressure and eliminate internal and external oil leakage. It is engineered to withstand the high hydraulic pressures and heavy-duty operating conditions encountered in large excavators.
The boom cylinder is responsible for raising and lowering the excavator's main boom, supporting heavy lifting, deep excavation, rock handling and loading operations. Continuous exposure to shock loads, high system pressures and contaminated hydraulic oil gradually wears the sealing elements, resulting in hydraulic leakage, boom drift and reduced lifting performance. Replacing the complete seal kit restores cylinder efficiency, protects internal cylinder components and helps maximise machine productivity while reducing costly downtime.
Typical Applications
Construction • Earthmoving • Mining • Quarrying • Civil Infrastructure • Road Construction • Demolition • Heavy Excavation • Material Handling
Common Symptoms
- Hydraulic oil leakage from the boom cylinder
- Boom drifting while raised
- Reduced boom lifting capacity
- Slow boom raising or lowering
- Internal hydraulic pressure bypass
- Difficulty holding boom position
- Reduced excavation productivity
Cross-Reference Part Numbers
OEM Part Number: 707-99-67120
Compatible Models
Hydraulic Excavators: Komatsu PC400-5, PC400LC-5, PC450-6 and PC450LC-6.
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 serial number, production series and regional specification. 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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