JOHN DEERE TRACTORS:
• John Deere 5210/5310/5410/5420/5520 4045/6068 PowerTech 4.5L/6.8L Diesel (1998-2007)
• John Deere 6020/6120/6220/6320/6420 4045/6068 PowerTech 4.5L/6.8L Diesel (1998-2007)
• John Deere 7210/7410/7510 4045/6068 PowerTech 4.5L/6.8L Diesel (1998-2007)
JOHN DEERE COMBINES:
• John Deere 9560/9660 6068 PowerTech 6.8L Diesel (2003-2007)
JOHN DEERE SKID STEERS:
• John Deere 320/325/328 4045 PowerTech 4.5L Diesel (2005-2010)
IMPORTANT:
Coolant temperature sensor for 4045/6068 PowerTech engines (1998-2007). 2-pin NTC resistance with 3/8 NPT thread. Do NOT confuse with the later M12x1.5 metric coolant sensor (RE522823) for 2006+ engines. The #1 ordering mistake is thread size — 3/8 NPT is tapered pipe thread, NOT the same as M12x1.5 metric straight thread.
Failure symptoms: erratic temp gauge, fan running constantly or not at all, poor cold-start, limp mode. The ECU uses coolant temp for fuel timing, glow plug duration, and fan engagement — a failed sensor causes cascading performance issues. Apply Teflon tape to NPT threads and torque to spec.
⚠️ Confirm 3/8 NPT thread and 2-pin connector.
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