Core Features
High-Pressure Sealing: The complete set of seals forms a triple seal between the piston, piston rod, and end cap, withstanding pressures ≥35 MPa. This prevents internal and external leakage of hydraulic oil, ensuring cylinder thrust and response speed.
Wear-Resistant Protection: Includes guide rings and support rings to withstand radial loads, preventing direct contact between the piston/piston rod and cylinder barrel, reducing wear, and extending cylinder life.
Adaptable to Operating Conditions: Suitable for dusty, bumpy, and temperature-varying environments such as mines and construction sites, preventing dust and mud intrusion and protecting the cylinder's internal structure.
Standardized Maintenance: All seals and wear-resistant parts are provided in a one-stop shop, avoiding mismatched models caused by piecemeal purchasing and shortening maintenance cycles.
Product Superiority
1. Material and Configuration Advantages
High-end Sealing Materials: The main oil seal uses fluororubber (FKM), which is oil-resistant, high-temperature resistant (-40~+120℃), and anti-aging, with a lifespan of ≥5000 hours; the dust seal is made of polyurethane (PU), with a dust scraping efficiency of ≥98%.
Precision Fit of Wear-Resistant Parts: The guide ring is made of cloth-reinforced phenolic resin, with a compressive strength of ≥280 MPa and a coefficient of friction of ≤0.15; the support ring is made of polytetrafluoroethylene (PTFE) + copper powder, adapting to piston rod movement without jamming.
Precise Original Factory Matching: All component dimensions are completely consistent with the D65/D85 cylinder bores and grooves, requiring no re-grinding during installation, and achieving a sealing fit of ≥99%.
Compatible with All Operating Conditions: Suitable for high-pressure (35 MPa) and high-frequency reciprocating (≤120 times/minute) operating conditions, resistant to extrusion and impact, eliminating seal failure caused by pressure shock.
2. Performance and Maintenance Advantages
High Sealing Reliability: Triple sealing structure, static seal leakage ≤0.05 mL/min, dynamic seal leakage ≤0.1 mL/min, meeting Komatsu original equipment manufacturer (OEM) standards.
Low Maintenance Costs: Fully pre-assembled, easy to disassemble and assemble, saving 40% in costs compared to piecemeal purchasing, and reducing maintenance time by 30%.
Long Service Life: The synergy between seals and wear-resistant components extends the cylinder overhaul interval to 8000 hours, reducing downtime frequency.
Installation and Maintenance Recommendations
Installation Points
Cleaning and Inspection: Clean the cylinder barrel and piston rod surfaces, ensuring no scratches or rust; inspect the repair kit components for damage or deformation.
Assembly Specifications: Apply hydraulic oil to the seals during installation and press them in with a special tool to avoid lip damage; ensure the guide ring and support ring are installed in the correct orientation and without twisting.
Clearance Control: Control the clearance between the guide ring and cylinder barrel to 0.10–0.15 mm to ensure smooth reciprocating motion without jamming.
Pressure Test: After assembly, perform a 35 MPa pressure test, holding the pressure for 5 minutes; no leakage indicates合格 (qualified).
Maintenance and Care
Daily Inspection: Check the cylinder for leaks, the piston rod for scratches, and the dust seal for damage every shift.
Periodic Replacement: It is recommended to replace the repair kit every 5000 hours or 3 years (whichever comes first) for preventative maintenance.
Troubleshooting: If cylinder leakage or insufficient thrust occurs, replace the repair kit first, check the cylinder barrel and piston rod for wear, and repair or replace as necessary.
Summary
The 707-99-52160 Repair Kit, featuring premium materials, precision engineering, and triple-seal technology, delivers reliable sealing and wear protection for D65/D85 bulldozer hydraulic cylinders. With factory-grade quality assurance, it ensures optimal sealing performance, compatibility, and longevity—effectively reducing maintenance costs while extending the interval between major overhauls. This is the ideal repair component to maintain peak operational efficiency. For specific parameters, refer to Komatsu's official technical manual. Installation should be performed by authorized dealers.
