If you want a direct replacement for your modern CAT D3K, D4K, or D5K tractor fleet with stable performance and ease of installation, choose XYohykai Radiator 253-1218; if you need heavy-duty cooling capacity with a larger core surface area for older C-series models like the D3C-III or D4C-III, choose Leyuncot Radiator 139-6887.
• XYohykai Radiator 253-1218: Strengths include high reliability and fast response designed specifically for newer K-series tractors; its trade-off is that it lacks detailed core dimension data in the sheet, limiting side-by-side thermal comparisons without physical measurement. Best for fleet managers upgrading or maintaining D3K through D5K units who prioritize plug-and-play compatibility.
• Leyuncot Radiator 139-6887: Strengths lie in its premium all-aluminum construction, four-row core design, and precise dimensions (27.17" x 21.65") offering rapid heat dissipation; its trade-off is that it requires careful verification of part numbers to ensure it fits only specific older C-series and track loader engines. Best for operators running legacy 933C, 939C, or D3C-III machinery where corrosion resistance and cooling efficiency are paramount.
This unit is built for the operator who runs the newer generation of Caterpillar compact tractors. The XYohykai Radiator 253-1218 is engineered specifically to fit the CAT D3K, D4K, and D5K Tractor models. When managing a fleet of these machines, time is money, and this radiator addresses that need by emphasizing easy installation and fast response. The manufacturer highlights stable performance as a key feature, which suggests that for daily operations involving consistent workloads, this component is designed to integrate seamlessly without requiring complex modifications or extensive downtime.
The product information confirms a single-unit count, indicating a straightforward replacement scenario. For a fleet manager dealing with the K-series line, the primary appeal here is certainty. You do not need to hunt for alternative mounting brackets or worry about obscure engine variants because the application list is tight and specific. If your maintenance schedule involves swapping out radiators on D3K, D4K, or D5K units, this part aligns directly with the original equipment requirements. It is a "worth choice" for those who value a solution that promises stability and minimizes the risk of compatibility errors during the swap process.
However, this product is not for everyone. If you are working with older machinery from the C-series era or track loaders like the 933C and 939C, this part simply will not fit. The lack of detailed dimensional specifications in the provided data sheet means you cannot verify clearance or core depth against an existing setup unless you have the physical unit in hand. Therefore, skip this option entirely if your fleet consists of anything other than the specified K-series tractors. It is a specialized tool for a specific job, and while it excels in that narrow lane, it offers no utility outside of the CAT D3K/D4K/D5K ecosystem.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-11-05 · 6 min read · Independent comparison
The Leyuncot Radiator 139-6887 targets a different segment of the heavy equipment market, focusing on durability and advanced cooling architecture for older, yet still heavily used, models. This radiator is compatible with the Caterpillar D3C-III, D4C-III, and D5C-III tractors, as well as the 933C and 939C Track Loaders. What sets this unit apart immediately is its construction material and design philosophy. It features an all-aluminum core rather than traditional copper-soldered units, which makes it significantly lighter while providing superior corrosion resistance. In a harsh job-site environment where chemicals, mud, and moisture are constant threats, this aluminum build ensures an extended service life compared to older manufacturing methods.
The core dimensions are explicitly listed as 27.17 inches by 21.65 inches, with a four-row configuration. This four-row core design provides a large surface area, facilitating rapid and continuous heat dissipation. For a machine like the D3C-III or the 939C Track Loader, which often operates under significant thermal stress, this increased surface area translates to better temperature regulation. The inlet diameter of 1.77 inches and outlet diameter of 1.97 inches are specific measurements that buyers must match to their hoses and connections. This precision is crucial for ensuring proper flow rates within the engine cooling system.
This radiator is ideal for fleets maintaining legacy equipment that demands more than just a basic replacement. If your operation relies on the 3046 engine or the C-series tractors, the Leyuncot unit offers a premium upgrade path. The manufacturer also notes a hassle-free return policy and expert support, which adds a layer of security for buyers verifying compatibility with specific serial numbers. However, this product is strictly for those older models. It will not fit the newer K-series tractors mentioned earlier. If you are looking to replace a radiator on a D3K or D4K, this part is irrelevant. It is a high-specification solution for a specific set of older machines that require robust, lightweight, and efficient cooling systems to keep running smoothly in demanding conditions.
• Best for newer K-series tractors → XYohykai Radiator 253-1218 (Specifically designed for D3K, D4K, D5K).
• Best for older C-series and track loaders → Leyuncot Radiator 139-6887 (Compatible with D3C-III, D4C-III, 933C, 939C).
• Best for lightweight and corrosion-resistant build → Leyuncot Radiator 139-6887 (All-aluminum core vs. standard construction).
• Best for high surface-area cooling → Leyuncot Radiator 139-6887 (Four-row core design with 27.17" x 21.65" dimensions).
• Best for simple, direct replacement → XYohykai Radiator 253-1218 (Emphasizes easy installation and fast response).
• Best for verified thermal specs → Leyuncot Radiator 139-6887 (Provides exact inlet/outlet diameters and core size).
• Best for minimizing compatibility guesswork → XYohykai Radiator 253-1218 (Clear application list for K-series).
• Best for harsh environment longevity → Leyuncot Radiator 139-6887 (Corrosion-resistant aluminum withstands tough job sites).
For a fleet vehicle context, I would recommend the Leyuncot Radiator 139-6887 if your operation relies on the C-series tractors or 933C/939C loaders. The explicit details regarding its four-row aluminum core and precise dimensions give me confidence that it offers superior thermal management and durability in a harsh environment. While the XYohykai model is excellent for the newer K-series, the Leyuncot unit's engineering specifics—particularly the corrosion resistance and large surface area—represent a more robust solution for keeping older, high-mileage machines running efficiently. I believe the added clarity on construction and dimensions makes it the safer bet for long-term fleet reliability where cooling efficiency is critical.
No, the Leyuncot Radiator 139-6887 is designed for older C-series models and track loaders like the D3C-III and 933C. You should use the XYohykai Radiator 253-1218 for any D3K, D4K, or D5K tractor.
The Leyuncot unit features an all-aluminum core that is lighter than copper-soldered units and highly resistant to corrosion, making it better suited for harsh job-site environments and extending service life.
You must verify that your machine is a Caterpillar D3C-III, D4C-III, D5C-III, 933C, or 939C with a 3046 engine. Check that your part numbers match 139-6887 or 187-8392 before purchasing.
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