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Re: 4420 auto header height

Do you have voltage at the lower solenoid when you are telling it to lower. If you do then the solenoid is bad or something in the valve, if not then the wire going to it is bad. You do have auto header height not DAM.
 

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Re: 4420 auto header height

There is a pressure regulating piston in the power beyond fitting in the main control valve block. If this is not working right you will haveonly low raising pressure when the electric valve is active and may not have enough pressure to evenpop the load check open to let itlower back down with the electrics.
Looking under the cab, on the main control valve, the fitting facing the front of the combine is the power beyond port. On these machines the PB fitting has a spring loader plunger in it. When the closed center type electric valve is not active the oil must push the plunger off its seat so the oil can circulate back out the Return port to the tank. When the electric valve is active the plunger should be pushed back down and the oil should flow thru the dilled passage thru the center of the plunger and on to the electric valve. If the spring is weak or broken then the plunger willfloat back far enough to allow some of the oil to escape out the Return port and so you have low pressure at the electric valve to try to raise or lower the head with.
A good way to find out would beto T a 3000psi pressure gage into the lift line. Check the pressure when holding the raise lever manually and then check it when the electric connecter is jumped and see if there is a big difference between them.
 

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Re: 4420 auto header height

I think you can still get shims to put behind the spring in the fitting. You might be able to replace just the spring if its bad. I don't remember what the pressure is supposed to be exactly. Have to ask a dealer to look that up for you.
Also on the lowering thing. There is a adjustment screw on the drop rate valve. This thing hangs in the steel lines under the cab. Adjusting the screw allowed for control of how fast the head dropped when the electric valve was in control. Makes a difference depending on how big and thereby heavy the head is.
 
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