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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Let's revisit the oil vs. hydraulic question???
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<blockquote data-quote="Land-Tech" data-source="post: 14501" data-attributes="member: 1679"><p>I'm changing hyd fluid in my Gehl today, going from Iso 32 to iso 46 which is reccomended.</p><p>I did a search to find out just what the grades mean. the numbers do reflect visocity but from what I understand,a more important referance for us is the viscocity index, which is the ability oil has to keep it properties at high or low temps.Muti wt oils have a higher VI than single wt oils they keep properties in extreme condition better.(anti-wear and lubrication along with the ability to flow) older hydralic systems with gear pumps can use just about anything with out a problem but all the info that I looked up reccomend that if you have piston pumps or low flow high pressure systems (newer minis) that you should use an oil that has a vi of over a 100.</p><p>The VI can be from 0 to 1000's The higher indexs are for extreme uses,(comppressors,turbines and space shuttles) Systems that have high hours or may be worn need either a multi- weight or bit higher viscocity to offset the internal leakage that comes from wear.</p><p>I'm with Tazza on the muti-grades, they work great. Warm you machine up to normal temps and notice what kind of sounds it makes when you run it, perferably after you changed the filters. Then work it hard and see if you notice a diff. If it makes a lot more noise maybe you can go to a better grade. again the iso or sae number is not the Vi. you will find the Vi in the fine print on the can.</p><p>There are other properties that oil needs that I could go into but I got to go to work. Will let you know if this makes a diff on my machine thanks scott</p></blockquote><p></p>
[QUOTE="Land-Tech, post: 14501, member: 1679"] I'm changing hyd fluid in my Gehl today, going from Iso 32 to iso 46 which is reccomended. I did a search to find out just what the grades mean. the numbers do reflect visocity but from what I understand,a more important referance for us is the viscocity index, which is the ability oil has to keep it properties at high or low temps.Muti wt oils have a higher VI than single wt oils they keep properties in extreme condition better.(anti-wear and lubrication along with the ability to flow) older hydralic systems with gear pumps can use just about anything with out a problem but all the info that I looked up reccomend that if you have piston pumps or low flow high pressure systems (newer minis) that you should use an oil that has a vi of over a 100. The VI can be from 0 to 1000's The higher indexs are for extreme uses,(comppressors,turbines and space shuttles) Systems that have high hours or may be worn need either a multi- weight or bit higher viscocity to offset the internal leakage that comes from wear. I'm with Tazza on the muti-grades, they work great. Warm you machine up to normal temps and notice what kind of sounds it makes when you run it, perferably after you changed the filters. Then work it hard and see if you notice a diff. If it makes a lot more noise maybe you can go to a better grade. again the iso or sae number is not the Vi. you will find the Vi in the fine print on the can. There are other properties that oil needs that I could go into but I got to go to work. Will let you know if this makes a diff on my machine thanks scott [/QUOTE]
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General Bobcat Skidsteer Forum
Let's revisit the oil vs. hydraulic question???
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