Posted by BobW on February 29, 2012 at 10:32:52 from (50.96.105.75):
The 3 pt lift on my friend's 600 stopped working last year, someone else resolved this by replacing the lift cover O rings, but he had to double the pressure side to get the lift back. Recently the lift stopped working again which is where I signed on. We removed the cover and it looked like the double O rings were not sealing. I found some dimensions for the OEM O ring, located a replacement, but no improvement so we moved on to troubleshooting the pump. We cranked the tractor with the lift cover off. I understand we should have 1500-2000 psi, oil flowed out of the gallery, but did not "shoot" out. What should I see? I pulled the pump off, I believe it is a NCA600F (piston type). The pistons/cylinders are smooth no obvious signs of wear, pistons move freely in their cylinders, springs appear to be uniform strength. Before we drop significant bucks into a pump, is there a way to better diagnose the pump condition? There is also a problem with water getting into the hydraulic system as the oil was milky. I drained and replaced the reservoir, but are there locations where water typically enters the system?
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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