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What caused the air to be in the lines? Were you having problems with progressively harder steering prior to bleeding the system?

Please keep this thread updated on what you do. I'd like to learn from your experience of what it took to fix the problem. Good luck in your repairs!

Unfortunately, I have not had the time to work on this problem with my truck and it has been sitting for over a year without being driven. It got to the point the last time I drove it that I could hardly turn right at all. I had taken it somewhere and had to plan a route home using all left...

Fluid of Choice? Ok - one more question. What do you use for power steering fluid? The lubrication manual says either OE/HDO 10 or OEA. I don't know what either of those mean. What is a non-military substitute?

More Problems Today I had my truck out today for a project and developed some new problems. At first it was acting like previous - no power steering for left turns and right turns had power assist after a brief restriction. After driving for a bit I came up to an intersection where I had to...

Bleeding the System Can you give me a brief description of how to bleed the lines or tell me what TM to look at? The TM's I've looked at so far don't seem to be the same power steering system as mine.

Same Problem On M51 I am having this same steering problem on my Mack powered M51. On a right turn I get a little resistance and then the power steering kicks in. Left turn is difficult all the time now. The problem seems to have gotten worse since the weather got cold. I checked the fluid...