PRO Program members can receive tiered savings on this line—up to 20% more off for qualifying accounts.
Shipping estimate & delivery timing
Share this product on social media and get an exclusive discount code!
Click any platform below to share this product. After sharing, you'll receive a discount code!
Built to support repair shops, fleets, and equipment owners with dependable parts sourcing and responsive service.
Qualifying new parts include 1-year coverage. Review the Warranty Policy section for coverage details, claim steps, and exclusions.
Eligible orders may qualify for returns within 90 days. See the Easy Return Policy section for conditions and next steps.
Send a question through Ask a Product Question or the contact form. Our team reviews requests on business days and follows up as quickly as possible.
| Model Number | 304 C CR, 305 C CR, 303C CR, 304D CR, 303.5 D, 303.5C CR, 904B, 305D |
| Engine Number | S3Q2, S4Q, S4S, S6S, S4Q2T |
| Compatible Model Brand | For CAT |
| Compatible Engine Brand | For MITSUBISHI |
| original | 103-9766, 1039766, CA1039766, 235-4959, 2354959, CA2354959 |
No reviews yet. Be the first to review!
Official answers about compatibility, package contents, specifications, installation, shipping, and warranty for Thermostat 103-9766 With Gasket 235-4959 for Mitsubishi Engine S4Q S4S S6S S3Q2 S4Q2T Caterpillar CAT Excavator 303.5D 303.5C 303C 304 304D 305 305D Wheel Loader 904B (SKU: ESY41793).
No product questions yet. Ask us using the product question form.
Send us your product question and we'll reply by email.
Every new aftermarket part from us includes a 1-year warranty. Full terms, coverage, and how to make a claim: Warranty Assistance.
We ship to customers around the world. Orders are sent with our standard courier service—trackable, dependable, and easy to work with. On this product page, use Get Estimate under the price to see shipping cost and estimated delivery for your location. For destinations, rules, and full details, read our Shipping Policy Details.
We want you to be confident in your order. If you are not satisfied, you may qualify for a return or refund within 90 days, subject to conditions. See our Easy Return Policy for eligibility, steps, and exceptions.
