John Deere 3029 Engine Temperature Sensor

Issue:
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.

Background:
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.

Diagnosis:

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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