lift pistons not lowering

[river-bottom tree farmer 0]

Was pleased to recently bring home a nice D 200, as my D 160's B/S re-power engine gave out.  Everything works, except for 3 point hitch lowering only when weight is applied, and then jerkily.  10W-30 in hydro looks clean.  Might this be a valving issue?  If so, I have two good lift pistons in the D 160 that I could swap.  If I were to do that, how would I take the pistons off?

 

[bc.gold 3,403]

IMO you're using the wrong type of oil, should call for Hydraulic fluid or type "A" atf or Dexron III

 

The probable cause for the jerking is that the 10W-30 is being aerated.

Edited April 24, 2020 by bcgold

[WVHillbilly520H 10,374]

5 hours ago, bcgold said:

IMO you're using the wrong type of oil, should call for Hydraulic fluid or type "A" atf or Dexron III

 

The probable cause for the jerking is that the 10W-30 is being aerated.

After 1973 Wheel Horse went 10w30 in all of is Hydrostatic transmissions whether Sundstrand or Eaton.

[peter lena 8,721]

in addition to using the correct hydraulic fluid . i would  set up a ground level heavy weight  to "  work or heat up this oil "  , that would give it a chance to flow / flush the fresh fluid . making a hydraulic system work with weight is best for it.  pete

[bc.gold 3,403]

Again IMO 10/30 is to heavy when cold, entrapped air will cause the bounce.

 

Just because the manufacture in later years recommended changing over from atf to 10/30 does not necessary mean they had  your best interests in mind.

 

The heavier oil may have corrected oil by passing lift cylinder o'rings, but the question remains what did Eaton or Sunstrand recommend for their product.

 

 

[pfrederi 17,867]

Well I run 10w30 in my D200 and do not have any issues and she is used year round.  The three point doesn't generate down pressure the weight of the implement lowers it.  What kind of implement do you have hanging on it.  If I want to get mine all the way down with no implement I stand on it.

 

If you are not sure when last time the fluid was changed I would start with that ans a new filter

 

Getting the rear lift cylinder off is a job. (Especially getting the hydraulic plumbing on and off)  If it lifts things OK I would leave well enough alone.

Edited April 24, 2020 by pfrederi

[bc.gold 3,403]

How to determine the best choice of hydraulic fluid to use for your equipment or system.

Although many manufactures of hydraulic fluid provide various grades of detergents and oxidation stability in the fluids they produce, the single factor that should weight the heaviest in determining the best choice of fluid to use is viscosity, otherwise known as the fluid's weight. Viscosity is also most often expressed as the fluids ISO number or grade.
 

Common ISO grades for use with hydraulic systems include 32, 46 and 68. Sometimes, 10, or 10 weight is mentioned as well. I would like to point out that for basic operation of any hydraulic system without concern to long-term effects of the systems life, 10W-40 automotive engine may be used, providing it does not contain detergent additives, and these additives used in engine oil can cause corrosion and cavitation. This occurs because the detergents can cause water that has condensed into the system to emulsify, preventing it from being separated from the oil.
 

It is recommended however, that a proper hydraulic fluid be used, and chosen based on its ISO grade. These fluids do not contain harmful additives that can cause damage to components, and are designed to work within a specific temperature range.

Higher viscosity hydraulic fluid tend to reduce the system's operating temperature by increasing the volumetric efficiency of the pump. If the viscosity is too high, however, will cause poor mechanical efficiency by increased friction during startup, and may lead to cavitation. Finding the right ISO grade that balances the benefits of volumetric efficiency against the drawbacks of mechanical efficiency is the key to a good long term oil choice. Ultimately the manufacturer of the equipment knows this value and is always best to consult the manufacturer to try to obtain the answer.
 

When it is not possible to do this, the age of the machinery may be taken into consideration, as the effects of heat and friction may affect the decision process. The following charts, provided by Paul Michael, Fluid Power Institute; Steven Herzog, Rohmax Oil Additives; Thelma Marougy, Eaton Hydraulics Operations, "Determining Hydraulic Fluid Viscosity Requirements". Machinery Lubrication Magazine. January 2007 may be helpful in determining the correct ISO grade for your hydraulic system.

Edited April 24, 2020 by bcgold