4520 was the first Deere tractor with a factory-installed turbocharger.
Early versions suffered serious problems with the air cleaner and fuel
injectors. The John Deere 4520 actually refers to 2 different John Deere
tractors. The original is the first tractor model from John Deere that
came with a turbocharger as standard. This was needed as the JD 4520 was
(and still is) used primarily a workhorse, pulling tractor. The more modern
model is the 4520 compact tractor.
us at 866-737-4966 if
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the John Deere 4520 model tractor.