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John Deere 790 Tractor Loader Lift Problems

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freonkid
Join Date: Jun 2010
Posts: 4 Williamsportmd
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2010-06-13          171521

Iam experiencing lift problems with 419 loader. Problems started immediately after I performed an agressive plunge into a three foot high pile of moist red clay. Loader works ok when in tilt position.Will not raise bucket nor drive bucket down. Please help.

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John Deere 790 Tractor Loader Lift Problems

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2010-06-13          171522

Don't understand works OK when tilted. ....

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John Deere 790 Tractor Loader Lift Problems

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freonkid
Join Date: Jun 2010
Posts: 4 Williamsportmd
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2010-06-14          171523

Clarification"works ok when tilted", I mean the tilt hydraulic cylinders work but the lift cylinders do not.This indicates either select controller problems or lift cylinder problems. I have removed the lift cylinders from the frame,leaving the hoses connected and the cylinder will not drive. ....

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John Deere 790 Tractor Loader Lift Problems

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jdgreen
Join Date: Jul 2003
Posts: 232 Maryland
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2010-06-14          171544

Have you checked the hydraulic quick couplers to be sure they are still plugged in tight? Try disconnecting and reconnecting them. Do you hear the engine labor when you try raising the loader? Does the joystick feel normal? No disconnected linkage? There is very little to go wrong with the selective control valve itself. If the lever is moving the spool valve, the oil should flow. As a test, you could disconnect the hoses to the tilt cylinders and plug in the lift cylinders to those couplers. Then see if the loader will lift. ....

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