Go BottomHydraulics on B7500
 | Duane Pearl
Join Date: Posts: 1 
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2001-05-16 28271
Is it normal for hydraulics in general to become less effecient as the fluid gets warmer? I noticed after using my B7500 for a few hours moving dirt with the fel, that the hyraulics which power the loader, lift arms, and power steering started to become a little weaker. I realize the hydraulics of this little tractor are not all that powerful to begin with, but after everything got hot even the power steering got a little stiff when I had a load in the bucket. The loader was not powerful enough lift the front of the tractor off the ground either, when normally it will do it... slowly, but it will do it. And don't get me wrong,I am not complaining about the strength of the hydraulics... If it had too much more power it would be dangerous with such a small tractor.
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| Paul Fox
Join Date: Posts: 1
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2001-05-16 28272
Yes, it is normal for hydraulics to lose some power when the fluid gets hot. That's one reason for large reservoirs. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-05-18 28323
There was discussion on another board. Somebody was running a new backhoe off a PTO pump, and had extreme heat problems. My solution was that he was working the hoe too hard and stalling the hydraulics too often. True! Work the hydraulics less and the oil runs cooler. Somebody else pointed out the reservoir issue. PTO pumps usually have smaller reservoirs than the tractor hydraulics. He mentioned that there is an ideal ratio between pump capacity and reservoir size for heat dissipation, but I forgot the ratio. That also is undoubtedly true. I run a multi-season petro hydraulic oil. I think of the multi-season oil is advantage in my cold climate. For all I know, multi-season oils may also thin out less single-weights at higher temperatures. Synthetic oils reportedly run cooler and also might provide an advantage (if the break-in period is past). ....
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