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Caterpillar 125-4812 is the temperature sender (brass screw-in body with lead and connector). It is used on Caterpillar 320B to 325B excavators (3116 and 3126 engines). This aftermarket version has the same mounting and electrical connector as the original, so it plugs in and bolts on where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Temperature Sender |
| Replaces | Caterpillar 125-4812 |
| Type | Screw-in temperature sender with lead and connector |
| Fits | Caterpillar 320B; Caterpillar 322B; Caterpillar 322C; Caterpillar 325B |
| Condition | New, aftermarket |
| Stat. HS-Code | 903289 |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 125-4812(SPM-HEP-3018) | Caterpillar 320B, Caterpillar 322B, Caterpillar 322C, Caterpillar 325B |
Wrong gauge reading
A failed temperature sender shows a cold engine that is hot, a hot engine that is cold, or no reading at all. Compare with an infrared thermometer before replacing.
Overheat warning
A sender that reads high can trigger a false overheat warning or derate. Check the coolant level and the wiring first.
Corroded terminals
Water and coolant get into the plug and the sender reads erratically. Replacing it is cheaper than chasing the fault.
Fitting tips
Fit it with the engine cold and the cooling system depressurised, use a new sealing washer or thread sealant as the original, and top up the coolant afterwards.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (12 aftermarket sellers) | USD 29.99 to 46.53 | 6 Oct 2026 |
| SINOCMP | USD 79.00 | 6 Oct 2026 |
| MyMROmarts | USD 146.05 | 6 Oct 2026 |
| Spare Part Mart | USD 23.99 | Today |
Our price of USD 23.99 is 20% to 84% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of Caterpillar 125-4812. It is not made by or affiliated with Caterpillar; the Caterpillar part number is used only to show what it replaces.
It fits Caterpillar 320B; Caterpillar 322B; Caterpillar 322C; Caterpillar 325B. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It has the same mounting and electrical connector as the original. Check the plug and terminals match your old part, and test it before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your postcode.
In USD for the quantity selected. The exact cost is confirmed at checkout.
