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Ships within 48 hours · Estimated delivery Aug 12 - Aug 17
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Description
Thermostat 3864178 3925473 for Cummins 6BT 4B3.9 6B5.9 EnginesReplacement part number: 3864178, 3925473, CT40663, J925473 Fit For Cummins Engine: 5. 9L ISB, QSB, 6BT, 4B3. 9, 6B5. 9, B4. 5, B4. 5S, ISC8. 3 CM2250, QSB3. 9 30 CM550, QSB5. 9 30 CM550 Application: Fit For Hyundai Forklift: HDF35AII, HDF45AII, HDF35A 2, HDF45A 2 Fit For Hyundai Excavator: R140LC 7, R140LC 9S, R140W 7, R140W 9S, R200W 7, R210LC 7, R210NLC 7, R210W 9S, R220LC 7, R220LC 9, R220LC 9S, R250LC 7, R260LC 9S, R140LC9S, R140W7, R140W9S,
Replacement part number:
3864178, 3925473, CT40663, J925473Fit For Cummins Engine:
5.9L ISB, QSB, 6BT, 4B3.9, 6B5.9, B4.5, B4.5S, ISC8.3 CM2250, QSB3.9 30 CM550, QSB5.9 30 CM550
Application:
Fit For Hyundai Forklift:
HDF35AII, HDF45AII, HDF35A-2, HDF45A-2
Fit For Hyundai Excavator:
R140LC-7, R140LC-9S, R140W-7, R140W-9S, R200W-7, R210LC-7, R210NLC-7, R210W-9S, R220LC-7, R220LC-9, R220LC-9S, R250LC-7, R260LC-9S, R140LC9S, R140W7, R140W9S, R200W7, R210LC7, R210LC9BC, R210NLC7, R210W9S, R250LC7, R260LC9S, RC215C7, RD220-7, RD220LC9
Fit For Dodge Pickup Truck: Ram 2500, Ram 3500
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 4
Very good Value for replacement part and reliable
Style: with Pre-Filter
Very good product for the price - the front brushes wear fast compared to the original Eufy’s but for the value you do get a lot of product. So only 4 stars but just for the brushes “appearing to not last as long and bend but the buy is worth the extras. The filters look and work identical to the OEM. Good stuff - thanks!
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Reviewed in the United States on December 25, 2025
★★★★★ 5
Perfect fit, 11s running like new!
Style: with Pre-Filter
All parts fit perfectly. My vacuum lasts about 20 min longer since the filter isn’t clogging it. Also, replacing the spinning brush quieted it down significantly, it sounds like new again.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Replacement parts
Style: with Pre-Filter
Was so happy to find the replacement parts for my eufy robovac. Really makes a big difference in vac performance.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
Everything you need to do full maintence of your robot vaccum
Style: C20 Parts * 19pcs
this kit truly includes everything you need to do full maintenance of your eufy C20 vacuum. From replacement brushes and filters to cleaning tools and essential spare parts, it covers all the basics to keep your vacuum running like new.
The components are well-made and fit perfectly, making installation quick and hassle-free. Regular maintenance becomes much easier when everything you need is in one convenient package. It saves time, extends the life of your vacuum, and helps maintain strong suction and cleaning performance.
Highly recommended for routine upkeep and long-term performance.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Muy bueno
Style: C20 Parts * 19pcs
Muy bueno lo recomiendo
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Reviewed in the United States on May 11, 2026