707-99-72090 Bucket Cylinder Seal Kit for Komatsu PC1250-8, PC1250LC-8

The SPARKLING MACHINERY NEW 707-99-72090 Seal Kit Photo:

Why Choose the SPARKLING 707-99-72090 Seal Kit?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •    - High-Tensile Materials: Uses premium Polyurethane and Viton components that resist tearing and deformation under high hydraulic pressures.

                                                                                                      •    - Contaminant Exclusion: Features a heavy-duty wiper seal designed to scrape away fine silica and rock dust before they can damage the primary rod seals.

                                                                                                      •    - Thermal Stability: Engineered to function reliably in extreme temperature fluctuations, preventing seal hardening in cold climates or softening in high-cycle mining operations.

                                                                                                      •    - Optimized Buffer Ring: Includes a specialized buffer seal to absorb hydraulic pressure spikes, protecting the main seal group from premature fatigue.

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Q&A Section

Q1: Is the 707-99-72090 kit used for the boom or arm cylinders?

A: Generally, no. While all cylinders on the PC1250-8 are massive, the bucket cylinder often has different dimensions or seal requirements due to the frequency of its motion. For the arm or boom cylinders, you typically require the 707-98-85320 or similar kits. Always check your machine's serial number in the parts manual.

Q2: What causes the bucket to "drift" or move slowly in a PC1250-8?

A: This is often caused by a failure of the internal piston seals included in the 707-99-72090 kit. When these seals wear out, hydraulic oil bypasses the piston, causing the bucket to lose its position and decreasing digging efficiency.

Q3: Can this seal kit be used on the earlier PC1250-7 models?

A: Yes, in many cases the bucket cylinder dimensions remained consistent between the Dash-7 and Dash-8 generations. However, because mining machines often have regional custom configurations (like SP or High-Reach), always verify the part number against your specific cylinder group.

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