n2deep Posted April 10, 2009 Share Posted April 10, 2009 What kind of oil goes in my mack power steering. Someone put ATF or something in it, smells like Dexron to me. Quote Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/ Share on other sites More sharing options...
maxidyne237 Posted April 10, 2009 Share Posted April 10, 2009 15w-40 diesel engine oil Quote Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/#findComment-33564 Share on other sites More sharing options...
n2deep Posted April 11, 2009 Author Share Posted April 11, 2009 Seals in steering box swelled twice the size they are supposed to be. Wonder if the atf has worked on the pump too. Quote Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/#findComment-33565 Share on other sites More sharing options...
HK Trucking Posted April 11, 2009 Share Posted April 11, 2009 May I suggest you read this entire thread:http://www.bigmacktrucks.com/index.php?showtopic=8761 Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/#findComment-33568 Share on other sites More sharing options...
Rob Posted April 13, 2009 Share Posted April 13, 2009 Seals in steering box swelled twice the size they are supposed to be. Wonder if the atf has worked on the pump too.It sounds to me like someone down the line added some "snake oil" to get a seal to stop leaking and what you have is a byproduct of not fixing something correctly. This late at night I cannot remember the chemical composition of the stuff that is added to oils to swell neoprene seals to get them to quit leaking. Brand name companies advertise these items for what I consider a miracle cure that seldom works long if at all.The Ross Gear steering gears are well known for leaking around the pitman, (sector) shaft seal, and the input shaft seal. Both of these seals are relatively easy to change on the truck.If your shaft seals have ballooned out it is probably because someone added much more of this stuff than recommended. Feel the sealing material, is is soft and supple and bend/conform easily? If it does, that is exactly what happened. Seals should be stiff and the annular garter spring should hold very noticable pressure against the shaft the sealing lips ride against.I don't believe in the additives. If a seal is leaking, it needs replaced. That's just my opinion. If there is a groove worn into the sealing area, use a speedy sleeve to repair the area.I'm sure you have a vane pump on that engine as there were very few gear pumps used on motive power applications. If the pump is not leaking I wouldn't worry about it unless it does not meet pressure/flow checks.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/#findComment-33660 Share on other sites More sharing options...
greendog32 Posted July 29, 2009 Share Posted July 29, 2009 It sounds to me like someone down the line added some "snake oil" to get a seal to stop leaking and what you have is a byproduct of not fixing something correctly. This late at night I cannot remember the chemical composition of the stuff that is added to oils to swell neoprene seals to get them to quit leaking. Brand name companies advertise these items for what I consider a miracle cure that seldom works long if at all.The Ross Gear steering gears are well known for leaking around the pitman, (sector) shaft seal, and the input shaft seal. Both of these seals are relatively easy to change on the truck.If your shaft seals have ballooned out it is probably because someone added much more of this stuff than recommended. Feel the sealing material, is is soft and supple and bend/conform easily? If it does, that is exactly what happened. Seals should be stiff and the annular garter spring should hold very noticable pressure against the shaft the sealing lips ride against.I don't believe in the additives. If a seal is leaking, it needs replaced. That's just my opinion. If there is a groove worn into the sealing area, use a speedy sleeve to repair the area.I'm sure you have a vane pump on that engine as there were very few gear pumps used on motive power applications. If the pump is not leaking I wouldn't worry about it unless it does not meet pressure/flow checks.Robyep they all used reg engine oil till a few years ago.all the new ones are using atf Quote Link to comment https://www.bigmacktrucks.com/topic/8992-power-steering-fluid/#findComment-38574 Share on other sites More sharing options...
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