John Deere 3029 Engine Temperature Sensor

When the operator turns the key to start some 5000 series John Deere utility tractors the fuel solenoid fuse blows and the engine will not start.

The John Deere 3029 series engine is a three-cylinder 2.9-liter inline diesel engine found on the model 5200, 5300, 5400, 5210, 5310, 5220, 5320, 5203 and 5303 utility tractors. The engine has a cold-start temperature sensor (thermistor) used to advance the engine timing during engine starts. If this sensor fails it can short out, causing a failure of the fuel solenoid fuse.

3029 engine cold start advance sensor


By unplugging the cold-start sensor and replacing any blown fuses, the engine should start (although it may be a rough start because the advance is disabled). If the engine starts with the sensor unplugged then a failed sensor may be the problem and replacing it might correct the issue. The temperature sensor for some engines in this series is John Deere part number RE503242, although a manual should be consulted to confirm all parts.

This article is provided as general trouble-shooting guidance and may not apply to all tractors and situations. Consult your owner's manual and tractor service manual before attempting any repair.

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