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Hitachi 4257129 is the brass coolant temperature sender with a single screw terminal. It is used on Hitachi excavators. 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 | Water Temperature Sensor |
| Replaces | Hitachi 4257129 |
| Sensor type | Coolant temperature sender |
| Body | Brass |
| Terminal | Single screw terminal |
| Fits | Hitachi EX200-2, EX200-3 and EX200-5 excavators with the Isuzu 6BD1 and 6BG1 engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 903289 |
| Country of Manufacture | China |
Hitachi machines
Check the part number on your old unit before ordering.
| Hitachi Part No.(SPM Part No.) | Fits |
|---|---|
| 4257129(SPM-HEP-4109) | Hitachi EX200-2, EX200-3 and EX200-5 excavators with the Isuzu 6BD1 and 6BG1 engines |
Gauge reads cold or wrong
If the temperature gauge stays low or jumps while the engine is warm, the sender is the usual cause. Check the wire and terminal first.
Overheat warning with a cool engine
A failed sender can trigger a false high temperature warning. Swapping the sender confirms it.
Fitting tips
Fit with the engine cold and the coolant drained below the sender, use thread sealant on the taper thread 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 |
|---|---|---|
| FridayParts | USD 14.18 | 23 Oct 2026 |
| eBay (6 aftermarket sellers) | USD 15.51 to 25.60 | 25 Oct 2026 |
| SINOCMP | USD 29.00 | 23 Oct 2026 |
| Mover Parts (Amazon) | USD 38.95 | 23 Oct 2026 |
| Spare Part Mart | USD 11.34 | Today |
Our price of USD 11.34 is 20% to 71% 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 Hitachi 4257129. It is not made by or affiliated with Hitachi; the Hitachi part number is used only to show what it replaces.
It fits Hitachi EX200-2, EX200-3 and EX200-5 excavators with the Isuzu 6BD1 and 6BG1 engines. 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.
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