Komatsu D65/D85 Tilting Cylinder Repair Kit-707-99-25890

Core Features

Complete Seal Reconstruction: Replaces all seals in one go, preventing internal/external leakage in both directions, ensuring cylinder tilting accuracy and thrust stability.

Wear Resistance and Guiding: Replaces guide rings and wear-resistant rings to withstand radial loads, preventing uneven wear on the piston/piston rod and extending cylinder life.

Enhanced Protection: Dust seals + O-rings combination prevents dust and mud intrusion, suitable for dusty and humid working conditions.

Standardized Overhaul: Original factory fasteners and installation tools ensure assembly accuracy, avoiding incorrect or missing parts, restoring the cylinder to its factory performance.

Product Superiority

1. Kit Completeness and Compatibility

Complete Original Kit Configuration: Includes piston seal (Glydring), piston rod seal (Step seal), guide ring, wear ring, dust ring, O-ring, retaining ring, and fasteners. No additional purchases required. Compatible with all sealing positions of D65/D85 tilting cylinders.

High-End and Durable Materials: The main seal is made of PTFE + carbon fiber + FKM fluororubber, oil-resistant and high-temperature resistant (-40~+120℃), with a lifespan ≥6000 hours; the guide ring is made of copper alloy/filled nylon, with a low wear coefficient and strong resistance to lateral loads.

Precise Matching: All component dimensions are completely consistent with the cylinder grooves and mounting positions, requiring no re-grinding during installation, with a fit ≥99%.

Compatible with All Operating Conditions: Adaptable to 35 MPa high pressure and ≤1.0 m/s reciprocating speed, resistant to extrusion and impact, preventing seal failure caused by pressure fluctuations.

2. Performance and Maintenance Advantages

High Sealing Reliability: The complete seal life is ≥6000 hours, 80% longer than purchasing aftermarket parts piecemeal.

Improved Maintenance Efficiency: One-stop overhaul eliminates the need for multiple downtimes to purchase parts, reducing maintenance time by 50% and minimizing downtime losses.

Controllable Costs: The kit price is 20% lower than purchasing individual parts, avoiding the risk of mismatch.

Warranty Guarantee: Original factory quality, providing a 12-month/2000-hour warranty with traceable fault coverage.

Installation and Maintenance Points

1. Installation Points

Cleaning and Inspection: Clean the cylinder, piston, and piston rod, ensuring no scratches or rust. Inspect all kit components for damage or deformation.

Assembly Specifications: Install the seals using specialized tools, with the lip facing the pressure side. Apply hydraulic oil to the elastomer to prevent the lip from turning over. Tighten the bolts to the original torque (end cap bolt torque 80~100 N·m).

Clearance Control: Maintain a clearance of 0.10–0.15 mm between the guide ring and cylinder to ensure smooth reciprocating motion without jamming.

Pressure Test: After assembly, hold the pressure at 35 MPa for 5 minutes. No leakage indicates合格 (qualified).

2. Maintenance and Care

Daily Inspection: Check the cylinder for leaks and ensure smooth tilting motion every shift. Stop the machine immediately if any abnormalities are found.

Periodic Replacement: A major overhaul is recommended every 6000 hours or 3 years (whichever comes first), replacing all seals and wear parts with this kit.

Troubleshooting: When the hydraulic cylinder tilts weakly or leaks, use this kit for overhaul first, check the wear of the cylinder barrel/piston/piston rod, and repair or replace it if necessary.

Fit scenarios and value

707-99-25890 provides a complete overhaul solution for D65/D85 bulldozer tilting cylinders, featuring original factory parts, premium materials, and precision fit. This OEM-grade maintenance kit ensures low friction, long service life, and zero leakage, effectively reducing maintenance frequency and costs while maintaining operational efficiency. Refer to Komatsu's official technical manual for specific parameters. For installation, contact authorized dealers.