The YNF16770 (S19017-21199) Pilot Seal Kit is designed for Kobelco SK025 excavators, providing a reliable sealing solution for the pilot control handle valve. Made with premium rubber and polymer materials, this kit ensures smooth control response, stable hydraulic performance, and long-lasting durability in daily operation.

• Compatible with Kobelco SK025 excavators

• Direct replacement for OEM part number S19017-21199

• Includes a full set of O-rings, seals, and backup rings for comprehensive pilot valve maintenance

• Made from high-quality NBR, PU, and PTFE materials resistant to hydraulic oil, heat, and pressure

• Ensures accurate pilot control and leak-free valve operation

• OEM-standard sizing for easy installation and reliable fitment

• Suitable for routine servicing or complete valve overhaul

• Improves the durability and responsiveness of the pilot control system

• Machine model: Kobelco SK025

• Component: Pilot Control Handle Valve / Pilot Valve

• Ideal for construction, landscaping, small-scale excavation, and utility equipment operations.

• Technical guidance for installation

• Packing photos and size confirmation before shipment

• Stable supply for long-term orders

• Custom seal kit production for other models

• Individual seals packed in protective bags

• Outer packaging: sturdy export carton

• Optional YNF branded or neutral packaging

Q1: Does this seal kit fit other Kobelco models?
A: It is designed for SK025. Please send us your part number or valve photos to confirm compatibility with other models.

Q2: What is the storage and service life?
A: Seals can be stored for 18–24 months and typically provide long-term use depending on operating conditions.

Q3: Can this be shipped together with other parts?
A: Yes, mixed orders are fully supported.