Posted by Bob on September 17, 2016 at 20:27:59 from (64.255.159.192):
In Reply to: new holland haybine posted by rldck20 on September 17, 2016 at 19:22:14:
This is NOT NH specific, but typically, a "wobble box" at either end is driven by a cog belt or a roller chain and the knives are timed by resetting the belt or the chain so that the both knives reach the outer end of their stroke and the inner end of their stroke simultaneously, cancelling out the vibration each produces.
Sometimes, it's not possible to get them set EXACTLY, but they still operate pretty well if they are a LITTLE off.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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