707-98-85320 Hydraulic Cylinder Seal Kit for Komatsu PC1250-7, PC1250-8

The SPARKLING MACHINERY NEW 707-98-85320 Seal Kit Photo:

Why Choose the SPARKLING 707-98-85320 Seal Kit?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •    - Heavy-Duty Rod Seals: Features a primary seal lip designed to maintain contact even during high-frequency vibration and cylinder "chatter."

                                                                                                    •    - Advanced Buffer Rings: Includes specialized rings to absorb pressure spikes and protect the primary seal from "diesel effect" (combustion caused by air in the oil).

                                                                                                    •    - Contaminant Exclusion: The wiper seal is specifically designed to scrape away the fine, sharp particles found in quarries and open-pit mines.

                                                                                                    •    - Full System Integrity: Prevents internal "drifting" of the arm or boom, ensuring the operator maintains precise control over the load.

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Q&A Section

Q1: Is this kit the same for both the Boom and Arm cylinders?

A: On many PC1250 configurations, the boom and arm cylinders share the same bore and rod dimensions, making the 707-98-85320 versatile. However, you should always check the parts manual for your specific serial number to confirm if the bucket cylinder requires a different kit (such as the 707-99-72090).

Q2: What is the shelf life of these seals?

A: When stored in a cool, dry place away from UV light, these high-performance seals have a shelf life of approximately 5–10 years. Once installed in a mining machine, they are typically rated for 4,000 to 6,000 hours depending on the severity of the application.

Q3: Can I replace just the rod seal without removing the piston?

A: While technically possible for a "quick fix," it is not recommended for a machine of this size. If the rod seal is leaking, the internal piston seals and wear rings are likely nearing the end of their life as well. A full rebuild with the 707-98-85320 is the only way to guarantee performance.

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