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Discussion Forum

When to Change Hydraulic Oil?

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Bob

04-14-2001 21:17:40




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I bought a 40 year old IHC farm truck to use to haul crushed rock to my place. I doubt if the hydraulic oil has ever been changed. I plan to change it shortly. My question is, does hydraulic oil break down over time or do you change it just to keep the system clean? How often should you change it when it is only used to raise the box once and awhile. The box seems to raise fine now. There is nothing in the owners manual about it.

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Jon Hagen

04-15-2001 22:40:14




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 Re: When to Change Hydraulic Oil? in reply to Bob, 04-14-2001 21:17:40  
Most truck hoist of that age do not have a hyd filter, so any dirt or metal in the oil endlessly circulates through the pump. Also if it has a single acting hoist then a gallon or more of moisture laden air is pulled into the oil tank every time you raise the hoist. The anti corrosion and water dispersant additives are long gone if the oil is years old. I think the oil is by far the cheapest part of that hoist to replace.

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Greg D.

04-15-2001 20:18:06




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 Re: When to Change Hydraulic Oil? in reply to Bob, 04-14-2001 21:17:40  
For the age of vehicle you describe, to have never changed the oil, I really don`t think it would be a waste of $$$$ to change it. Every manufacturer will have a spec for change interval. While I don`t know what the AG type machines caLL for, Hitachi uses an OEM oil speced for 4,000 hour change IF you don`t dilute it with a standard 46 type hydraulic oil. In an occasional use application, I would consider at least a filter change on a scheduled service interval.

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Ray,IN

04-14-2001 23:01:01




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 Re: When to Change Hydraulic Oil? in reply to Bob, 04-14-2001 21:17:40  
As long as the oil is dirt/water free you should'nt need to change it. Hyd. oil doesn't need changing the way crankcase oil does because it's in a closed system, it's the blowby that causes the formation of acid and fuel dilution that prompts the 2X yearly oil changes recommended for seldom used engines. That's my spin on the subject.



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