John deere 420 lawn tractor has trouble starting and is getting gas and cranks but won't fire.
The engine needs air, so be sure the air filter is clean. If it is not, replace it.
The engine needs spark. Replace the spark plug and be sure that the battery has a complete charge.
The engine needs good fuel so be sure the gas is newly purchased, not gas that has been sitting around for months.
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I am getting the error code 57 and the tractor engine will not start. The error code states the HST controller has timed out. What is the HST controller and can it prevent the tractor to start?
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