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Re: Re: hydraulic oil for H ?
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Posted by Buttin in where I shouldn on February 04, 2004 at 09:28:42 from (199.46.199.233):
In Reply to: Re: hydraulic oil for H ? posted by Dave in CT on February 03, 2004 at 15:46:12:
Hy-trans is about 1/2 the viscosity rating of 30W at room temp. It is a combination transmission and hydraulic fluid. The good thing is that it's all weather; much better than 30W when cold and the bad thing is that wear on your gears is said (by whom?)to be slightly higher than the 80-90 Mineral Oils due to lower surface tension (when the gears are under heavy pressure it can squirt out more easily than the heavy oil will). As far as detergent or not, detergents (as I know them)were made to suspend products of combustion in internal combustion engines, which are light, whereas your hydraulic system probably is mostly sand and dirt (heavy....won't stay in suspension). Not sure it matters (detergent or non-detergent)..........except straight non-detergent 30W is all oil which is a lubricant; detergents are not and compete with your lubricant for space in the tight spots. Course the question we all have to ask ourselves is how much oil do you need between 2 gears under pressure to protect them? I'd answer that two ways: (1), one molecule of oil thickness would keep metal from touching metal, but if you were squeezing it that hard (2), it is going to get hot so it would need a cooler. Additionally the thinner oil doesn't dampen machinery vibration and noises so thin oil will be noisier. I have Fords, JD's and have had Massey's built in the early '60's and earlier IH. There was a mix of where what oil was used (tranny/hydraulics/differential). The JD used the HY/Tran type fluid in everything but there were 2 important additions: A massive fluid cooling radiator in front of the engine radiator and a huge externally removable filter for the fluid. Fords and Masseys didn't have an external cooler and some had filters and some didn't. Looks like you can make your own decisions here. The reason for the response to your Post is this. Hydraulic pressure, as you know, is 1200 to 2500 psig. I don't think you want that kind of pressure on any filtering system. Manufacturers either use a low pressure (150# with a big thick steel cover over the filter) circulation system for the fluid (JD) or put the filter in the low pressure side of the system (drain or intake). You could HAVE YOURSELF A BOMB if you put the filter you're talking about in the high pressure line (especially if it is a spin on like most are these days). Sorry for butting in. Mark
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