re David Brown 990 64 model

noel martinz

New User
Hi,
after attaching grader blade at rear, it will not hold to the height required. It will just drop down to the ground scrapping too much soil. We have once drained completely all the old hydraulic oil, cleaned the filter and refilled new oil. Is the oil viscosity the issue, where is breathing value. I do not have power steering. Where can i get one.
Thanks,
Noel
 

Not sure I understand your issue, it won't hold the implement in position or it drops it too fast? If speed is the problem and the 990 is like the 885, there is knob on the front of the quadrant that lets you adjust the speed of lowering the lift arms, maybe giving it a turn will help. If it won't hold I can't help.
 

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