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Re: HYDROLIC OILS
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Posted by Ronald on January 24, 1999 at 15:46:41:
In Reply to: HYDROLIC OILS posted by PAT LEWIS on January 24, 1999 at 11:20:36:
I noticed the other guys never gave you any reasons why not.
There are some systems that do use standard motor oil and in some area's where the temp. is extremly high a heavy viscosity oil. However the normal practice is to use a 10w or 20w or 5w-20w if the unit uses motor oil, other than that a 33 or 45 hydrolic oil sould be used.
As motor oil has some diferent aditives they act diferently on some types of seals and will cause leaks if not through the flang of the seal(seqling serfice) then by actualy deteriating the seal or gasket.
If the unit calls for hydrolic oil that is what should be used, even if you have a barrel of oil you have no use for or got a real deal on some oil. Vice versa if it calls for motor oil then that is what should be used as hydrolic oil does not have the lubricating values that motor oils do.
Remember Pumps, Valves and cylinders cost a lot more that oil.
The reason for the thiner oils is of course for fluid transfer as the one felow said 40w at -30 would be unable to get to the pump therefor cavitate in which case sevier damage to the pump.
Fluid transfer would be so slow even in +5 weather that you would be 3 min to raise a bucket on a loader. However if this unit you are talking about is say on drive system and you could heat the oil up or it is inside and it calls for motor oil you posibly could use it if you were haveing overheating probles which cause a loss of power do to bypass.
Hope this helps
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