[AT] 7030 hydraulics

[Cecil R Bearden]

When I said it boils the fluid out, it will blow the filler/check 
dipstick out under the seat and fill the cab floor with oil.  We were 
pulling a hydro swing swather that had its own pump the hydraulics were 
only used for raising or turning, the power steering worked fine.  We 
also pulled a 15 ft bush hog with it and it would blow the fluid out the 
dipstick. The tractor has plenty of power, I never have loaded it enough 
to open the governor.

Cecil in OKla


On 2/9/2014 8:06 PM, Dennis Johnson wrote:
> In reading posts about overheating, I an not convinced that filters cause overheating. Suction filter can cause cavitation problems that tear up systems, but heat is generally not an issue.
> Most heat problems are caused by 2 things
> 1 - doing more WORK than the system was designed to cool
> 2 - dumping fluid across a relief valve or some similar valve.
> Only solution to problem #1 is either to do less hydraulic work, or to redesign the system somehow to handle the increased cooling needs. Fixes can include adding a cooler, increasing tank size, or possibly changing something like a motor to reduce the system pressure.
> Solutions to problem #2 is fixing valves, or changing the circuit. If you have closed circuit valves operating with a fix displacement pump, you just make heat.
>
> About the filters, years back I was working on various hydraulic systems, and after working with Parker (Denison) engineers, I was convinced that for most systems suction filters cause more problems than they solve. A course strainer can work to keep rocks and rags out of pumps, but a better solution is not to allow rocks and rags in the tank.
>
> Thanks
> Dennis
> Sent from my iPad
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