Posted by Andy R on August 30, 2017 at 19:00:46 from (166.181.83.232):
Been trouble shooting my John Deere 6620 combine Dial-a-matic header control. When using a jumper wire on the round pin electrical connector at the combine throat the throat will raise without the header attached. Put the John Deere 220 platform on and then jump it the hydraulic system will not raise. It tries some, flexing the floating head some, but it will not lift it. When I use the hydraulic lever in the cab it will raise right up. Does the hydraulic lever in the cab work on a open system and the auto header control maybe work on a closed system with a relief valve???? Maybe the closed system of the auto header has a weak pressure relief valve?????? Hydraulic system would get hot off and on when doing soybeans last year. Slowly getting this narrowed down. Thanks for your ideas.
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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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