Complete steering cylinder seal kit for CAT 416C/D, 424D, 428D, 430D loader series—leak-proof.
Premium-grade elastomer seals for high-pressure sealing
Includes rod seals, piston seals, O-rings, backup rings—full rebuild kit
Resistant to hydraulic fluids, heat, wear, and extrusion
Direct OEM replacement for CAT part numbers 1787189 / 178‑7189
The YNF04203 steering cylinder seal kit is engineered for use with CAT 416C, 416D, 424D, 428D, and 430D backhoe loaders. It contains precisely molded seals—piston, rod, O-rings, and back-up rings—made from high-performance material that resists hydraulic fluid exposure, high temperatures, and mechanical wear. Designed to prevent leaks and restore hydraulic pressure integrity, this kit matches OEM dimensions (1787189 / 178‑7189) for plug‑and‑play installation. Ideal for maintenance teams and parts buyers looking to reduce downtime and prolong cylinder service life.
| Specification | Details |
|---|---|
| Applicable Models | CAT 416C, 416D, 424D, 428D, 430D backhoe loaders |
| OEM Part Number | 1787189 / 178‑7189 |
| YNF Part Number | YNF04203 |
| Kit Includes | Piston seal, rod seal, O-rings, backup rings |
| Material | High-durability synthetic elastomer |
| Pressure Rating | Up to 250 bar |
| Temperature Range | –30 °C to 120 °C |
| Fluid Compatibility | Mineral & synthetic hydraulic oils |
| Documentation | Installation guide (PDF) |
| Installed On | Steering cylinder of loader hydraulic system |
| Origin | China — YNF Rubber |
| Brand | YNF |
| MOQ | 20 kits |
| Shipping Options | Sea / Air / Ground freight |
| Payment Terms | T/T, L/C, D/P |
Restore steering cylinder performance in your CAT loader with the YNF04203 seal kit—compatible with 416C/D, 424D, 428D, and 430D models. Equipped with OEM-identical seals, our kit ensures full hydraulic integrity, eliminates leaks, and supports pressure control under demanding conditions. With YNF quality and plug‑and‑play fit, your cylinders are rebuilt to perform like new. Request a quote now to minimize downtime and enhance loader reliability.
| Application Area | Description |
|---|---|
| Backhoe Loader Steering | Used in CAT 416C/416D and 400D series steering cylinders |
| Construction Equipment | Seals loader steering hydraulics under heavy load and frequent cycling |
| Heavy Machinery Maintenance | Used in preventive maintenance to restore hydraulic seal integrity |
| Equipment Overhaul | Essential component in cylinder rebuild kits for CAT loader series |
Related Products & FAQs
Related Kits: YNF also supplies cylinder seal kits for CAT 420D, 432D, and loader bucket cylinders.
FAQs:
Is YNF04203 a drop-in replacement for OEM 1787189?
Yes, seals match OEM specs for dimension and material.
Expected delivery time?
Typically 4–6 weeks for MOQ of 20 kits; expedited options available.
Are seals suitable for high-temperature environments?
Yes, the elastomer is rated up to 120 °C, suitable for loader service conditions.
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