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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Michigan 75A steering

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Tony Berenz

06-05-2007 18:17:54




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This is an early Michigan 75A solid frame loader. I bought it with the steering cylinder and integral valve out of the machine. Steering is built with tie rod from steering gear connected to slider on valve which is bolted to the end of the cylinder. It looks like the valve has been taken apart previously for the "no steering" prob. When i took it apart, found small pieces of nylon/teflon jambing what I assume is the relief valve. Cleaned everything thoroughly and pressurized cyl with 120psi air w/ no piston leaks bypassing. Still didn't work when installed. Removed again w/ nothing found in valve. It seems like it is pressurizing the cyl somewhat in both dir, but not enough to move wheels. Pump has LOTS of flow, haven't been able to check pressure. I have no manuals on this, any advise on setting the valve up or troubleshooting? What other equip had this type setup, been told old trucks had similar. I can send pics if needed... HELP!

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AJK

06-10-2007 15:34:26




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 Re: Michigan 75A steering in reply to Tony Berenz, 06-05-2007 18:17:54  
That type of PAS was common on trucks and tractors in the 60s/70s,did you remove the rod to check the piston seals as its the only place that the bits you found in the valve could come from,the cylinder may not leak externally but can leak internally and result in no steering,that type valve is very sensitive but it usually would work one way better than the other if it is out of adjustment,as best as I can remember that the ball joint should have no play but should not be too tight either,if it has play take out the cotter pin and screw the ring in to get rid of the play.
Good luck
AJ

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