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Hydraulic drift problem

V

vista2016

Member
I need some hydraulic help. I've got a Deere 440ICD with simple outside mount 602 blade. Power up/down, manual angle.
I've been fighting a problem where the blade won't stay up. It started as a slow drift but now it's to the point where it goes down so fast now that I have to hold the valve so there's constant pressure holding it in the up direction.
What makes no sense is that I can put the blade down and lift the front of the machine and it'll hold and not drift at all.
I just spent about 2 hours putting a new valve on and it didn't help a bit. Fluid level is full, pump seems to be making good pressure. I'm stumped and disgusted at this point.
 
Hey Vista. Let me get this right so you have replaced the spool valve so next it has to be leaking seal in the ram or rams. So clean them take apart and get seals from a local hydraulics shop and should be problem solved. Check the cylinders to see they are not scored so they will not damage
new seals.

Regards

Matt
 
Thanks Matt. I agree, that's the only thing left to replace at this point. Just seems crazythat both cylinders would go bad at close to the same time. I would think if it was only one cylinder then I wouldn't notice the problem because the other cylinder would be doing all the work but I could be wrong.
 
Those hydraulic cylinders probably have two seals per cylinder, one for each direction of movement. The cylinders are also cross connected so both have the same pressure on them for lifting. If one seal comes apart on one, the other will not have pressure to do the lifting. Replace the seals on both cylinders as they have the same amount of hours of use and if one is worn out the other probably is too.
 
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