Posted by Andy R on August 31, 2017 at 20:56:46 from (166.181.80.218):
First, thanks for the ideas you have given on this issue. Ok,start the combine and increase engine RPM to near wide open. Drop the JD 220 platform with the hand control and about 18" off of the ground the Dial-a-matic takes over and continues to lower the head. Head is 3 wire toggle switch(s) system and combine is DAM. Header and combine connected with John Deere adapter. Everything seems to work. As you move across the barnyard the header raises and lowers and you can hear the clicking of the solenoids.
Well, I walked around to the right side of the platform with the engine still at high rpm and the Dial-a-matic still on the second spot. Reach in and pull on the "red ball rod" and the header raises, release and the header drops. It will do this up and down manually pulling and releasing the rod maybe 10 times over maybe 2 to 3 minutes just as it should. After a couple minutes it is getting slower and slower to lift the head and eventually it WILL NOT LIFT THE HEAD!!!!!!! All of this in 2 - 3 minutes. The auger swing still works just fine and the manual lever in the cab can still easily lift the head. All other hydraulic operations are OK as well. Shut it off for an hour and the header auto height control works just fine again for 2 - 3 minutes and eventually develops the exact same problem.
Now were do I go????? Sounds like as the oil warms it is bypassing somewhere easier then eventually bypasses entirely verse the weight of the head. The manual cab lever still easily raises the head even after Dial-a-matic has quit. Surely not the raising solenoid getting too hot. Hydraulic temperature light would come on last fall and eventually go off if you stopped combining for a while. It would stay off for sometime.
Appears to be a hydraulic issue. What are your ideas. Thanks Andy
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