This is a new Genuine Replacement Non-Foaming 1 Quart Hydraulic Oil for a GREENLEE 975 Hydraulic Pump!  These hyrdraulic pumps always seem to run low on oil when you are not expecting it and need to finish a job!  Or a hose breaks, or the pump seals start leaking, putting you in a bind.  If you don't need it now, it's good to have a quart or a gallon for a back up! (We have gallons available in another listing)  They are not usually in stock at your local Greenlee Dealer!  

You can't just use any Hydraulic Oil on the Greenlee 975 Hydraulic Pump, or you shouldn't!  Just look at these comments from actual users, when doing a search for this question...

Anyone know what the generic equivalent is for Greenlee?s Hydraulic Fluid (4017GB)? AW-32 (~10 weight) maybe? Thanks in advance

1)  I don't know the equivalent but do not mix oils of this grade even if they seem to match. The proprietary additives sometimes react with one another and can damage your tools.  

2)  Hydraulic fluids are NOT oils, at least not in the "10W40" sense. Indeed, many of them are not oils at all.  I work with hydraulic oils every day. Some are mineral-oil based, some are glycol based, and some are even ammonia based. The only thing these oils have in common is that they all are very resistant to foaming under vacuum.  Using the wrong oil will FUBAR your seals. Introducing dirt when you change the oil will FUBAR your seals.  Considering the price of the equipment, a few extra dollars for the recommended oil isn't a bad deal. I do suggest, though, that you pass it through a 5-micron filter before you add it.

3)  My father is replacing seals & etc in a Greenlee 767 manual hydraulic unit. Figured we could save some money safely by using a generic equivalent hydraulic fluid. Did not anticipate the recommendations against that.  

4)  A lot of people have used hydraulic jack oil, and it's good for three months, then you get to buy seals for your pump and ram.  Use their oil, or something that THEY list as equal.....