An essential component of the cooling system, the 716/30128 coolant temperature sensor by NEXGEN. It is a precision sensor, typically screwed into the thermostat housing, designed for JCB machines (incl. Fastrac, Loaders) equipped with Perkins 1000 Series (AK) and Cummins QSB-6.7 TIER 3 engines. It features a 2-pin connector and an M20x1.5 thread, providing an accurate coolant temperature reading for the gauges or ECU.
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| Brand | Type / Series / Model |
|---|---|
| JCB | Telehandlers: 520S LE, 524-50, 525-50 LE, 525-50S, 525 LE, 526 LE, 528-70, 530, 530 FS PLUS, 530 LE, 530 LE SWAY, 532, 532 SWAY, 532H, 532LE SWAY, 535-140, 535-95 FS, 535-95 SWAY, 537, 537H LE, 537LE, 540 LE, 540 SUPER AG, 540S XL |
| JCB | Wheel Loaders |
| JCB | FASTRAC |
| JCB | Dumptrucks |
The list above is for reference. The key compatibility criteria are the engine type (Perkins 1000 AK or Cummins QSB-6.7) and the sensor specification (M20, 2-pin).
When diagnosing temperature issues, we also recommend checking the condition of the thermostat, thermostat housing (for cracks), the radiator, and the temperature gauge itself.
A failed water temperature sensor is very dangerous. A false reading (showing a cold engine when it is overheating) provides no warning to the operator, which can lead to a cracked cylinder head, blown head gasket, or complete engine seizure. The repair costs will far exceed the cost of the sensor.
The 716/30128 sensor is a thermistor – a resistor whose resistance changes with the temperature of the coolant. Screwed into the thermostat housing, it is immersed in the coolant. It sends an electrical signal (variable resistance) to the dashboard gauge or the ECU, informing the operator of the operating or critical (overheat) temperature.
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In some JCB machines (like Fastrac), sensors with this part number (or 716/28800) are used interchangeably for water or oil. However, you should always verify the part number in the parts catalog for the specific function, as they may have different resistance ranges.
The most common cause is a failure of the sensor itself (burnout or short circuit). It could also be a damaged wiring harness (broken wire), a blown fuse, or a faulty gauge on the dashboard.
In most Perkins 1000 AK and Cummins QSB 6.7 engines, this sensor is screwed directly into the thermostat housing or nearby, allowing it to measure the temperature of the coolant exiting the engine.
Do you have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you select the right part to get your equipment back to work as quickly as possible.
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