Re: Hyd. pump noise
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Posted by Alton on December 10, 2002 at 14:49:21 from (220.127.116.11):
In Reply to: Hyd. pump noise posted by Joe on December 08, 2002 at 12:11:55:
It could be cold oil bypassing the pressure relief if it is in the pump. You can tell this by plumbing in a pressure gauge on the outlet side of the pump. A lot of equipment manufacturers recommend a 3 to 5 minute warm up at low engine speeds in cold regions. If it operates normal after warm up it shouldn't be anything wrong with the pump. Any good quality Universal Tractor Hydraulic Fluid should be ok. I don't recommend thinning but use a different weight for cold weather than hot weather. Vane pumps tend to be a little noiser the gear pumps. I don't know what kind of pump you have.
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