Posted by JD Seller on June 11, 2016 at 00:18:22 from (208.126.198.123):
In Reply to: hydaulic oils posted by taem on June 10, 2016 at 20:51:42:
The oil MIGHT have caused an issue but I would think it is more of a JD 2640 issue. The system in them really can be a nightmare to fix if you do not understand how they work. Also if one component goes south, running it after that can easily ruin other parts of the hydraulic system.
First thing is to get rid of the current fellow. You need to have pressure readings and flow rates to tell what/where the trouble is. Not guessing at the problems. It could be the transmission or charge pump. It also could easily be the PTO and or Hi-Lo lines if it has that option.
Also how is the loader plumbed??? IF your just running it out the rear SCVs or using a power beyond kit with out dumping the return oil back in to the charge circuit, you will have chattering loader operation and a starved main hydraulic pump. Which could have worked for a while but now has failed.
Here is the bad news. It almost never is a CHEAP repair on a JD 2640 hydraulic system.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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