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Working On The 990


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#16 Sawdust OFFLINE  

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Posted May 26, 2014 - 12:12 AM

Could the wrong filter cause this? It's got a stp oil filter on it now(recently changed by the po)?

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Fram PH16 is recommended. 20W oil is recommended but hard to find. 30w or 10W-30W will work fine.


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#17 olcowhand OFFLINE  

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Posted May 26, 2014 - 02:21 AM

I like to use 15w40 in worn hydro's myself.


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#18 Sawdust OFFLINE  

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Posted May 26, 2014 - 08:02 AM

I like to use 15w40 in worn hydro's myself.

Kind of like a stronger cup of coffee when we get older right :D


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#19 olcowhand OFFLINE  

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Posted May 27, 2014 - 07:46 AM

Kind of like a stronger cup of coffee when we get older right :D

 

Right!  :thumbs:



#20 HALFSCALE ONLINE  

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Posted May 27, 2014 - 09:26 AM

"W" stands for winter , not weight. 15w40 means it will not get any thicker than 40 in the cold and no thinner than 15 in the heat. Most hydraulic oil is straight 30, including ATF. If you use a thicker oil , it will push and not get between were it has to go , it will run hotter and cause metal damage.



#21 TAHOE OFFLINE  

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Posted May 27, 2014 - 09:48 AM

Could the wrong filter cause this? It's got a stp oil filter on it now(recently changed by the po)?

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Could be. STP filters are made by Champion labs who makes Fram and those are junk too.



#22 olcowhand OFFLINE  

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Posted May 27, 2014 - 10:33 AM

"W" stands for winter , not weight. 15w40 means it will not get any thicker than 40 in the cold and no thinner than 15 in the heat. Most hydraulic oil is straight 30, including ATF. If you use a thicker oil , it will push and not get between were it has to go , it will run hotter and cause metal damage.

 

I'm pretty sure most ATF is 10W.


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#23 Texas Deere and Horse OFFLINE  

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Posted May 27, 2014 - 11:03 AM

I'm pretty sure most ATF is 10W.

most all Hydraulic fluids are either 10 or 15 wt.


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#24 BairleaFarm OFFLINE  

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Posted June 02, 2014 - 09:55 AM

Ive also noticed she rolls down hill when the engine is off.  Ive always had a hydro sit where I park it.  Is it hard parts that are worn or things like orings?



#25 olcowhand OFFLINE  

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Posted June 02, 2014 - 10:11 AM

Ive also noticed she rolls down hill when the engine is off.  Ive always had a hydro sit where I park it.  Is it hard parts that are worn or things like orings?

 

Most likely hard parts.



#26 BairleaFarm OFFLINE  

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Posted June 02, 2014 - 10:26 AM

Most likely hard parts.

SUPER



#27 olcowhand OFFLINE  

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Posted June 02, 2014 - 11:57 AM

When they go faster downhill, that's more or less the speed it should go at that setting on level ground.  On uphills with a worn hydro, the pressure rises, so with a worn hydro, oil is bypass in the worn areas.  Uphill slows down due to bypassing, then when you top the hill, the load falls off, allowing it to speed up to full capacity...or a tad faster even.


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#28 BairleaFarm OFFLINE  

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Posted June 04, 2014 - 07:02 PM

I know nothing about hydros but do they have a spring loaded bypass?

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#29 olcowhand OFFLINE  

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Posted June 04, 2014 - 08:56 PM

I know nothing about hydros but do they have a spring loaded bypass?

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They do have pressure reliefs, but the bypassing I'm speaking of is at the piston spool face where it mates to the housing.  I'm not familiar at all with the Eaton units though, having never been inside one to know.



#30 twostep OFFLINE  

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Posted July 11, 2014 - 09:47 AM

Selling this already?






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