Posted by valiant farmer on September 11, 2018 at 01:40:31 from (122.57.141.156):
Hi all,
I have a David Brown 850 that the hydraulics aren't working on. My uncle bought it from a scrap metal yard, fixed it up and got it running. The hydraulics always were terribly slow going up, and it took two of us to jump it down (as the shaft end by the TCU was seized. I have pulled that apart and cleaned it up and it moves smoothly now.) One day it decided to quit working (just when we were needing it desperately!). He always ran 80-90 gear oil in it, but now I am wondering, is that to heavy a grade oil to run the hydraulics? The pump is giving next to no pressure, and the pump bushings are done for. I have seen a video where someone fixed the hydraulics on their 880 (same hydraulic system as mine) and they said that it ran 100% better and faster when they put 30 or 40 weight motor oil in the gearbox.
Does anyone have any experience with this DB hydraulic system?
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