Power steering 841

William Fissell · Dec 16, 2014

Hi, All,

while tooling around in my 841, I turned the steering wheel all the way to the right lock. The power steering pump screamed a little like a pressure relief valve was opening, and normal driving followed just fine.

Later, I noticed the R power steering cylinder had a lengthwise split on the bottom and fluid was leaking out.

I can but a new cylinder (don;t think theres a rebuild part for just the cylinder), but is there a problem with the pump? I've never heard of a pressure relief valve not opening and bursting a cylinder.

thanks in advance.

Bill

Sean in PA · Dec 16, 2014

Lots of possibilities.

High pitched squeal could have been the relief valve or it could have been the pump itself squealing from being dead headed.

Relief valve could have been stuck and didn't open at all, or could have opened at a higher than designed pressure.

Cylinder could have already been cracked, just not enough to leak yet, and the relief valve might have opened at the correct pressure, but since normal operation without hitting full stop never reaches full relief pressure, that one time hitting full stop and obtaining full relief pressure may have been the straw that broke the camels back.

Probably never know for sure. Before you replace the cylinder and put everything back together, you might consider making a loopback line with a test port and shutoff valve between the pressure and return ports on the pump, and put a gauge on the test port and see what pressure you get when you shut the valve. That'll tell you if the relief valve is opening and at what pressure.

William Fissell · Dec 17, 2014

thanks! Didn;t know it was a sin to turn the PS all the way to the
lock!

Ultradog MN · Dec 17, 2014

I have never heard of a cylinder splitting before but there have been other posts here about guys bending the cylinder rod on these tractors. No one ever came up with a difinitive reason why but I have learned to never hold the wheel hard against the lock. I will turn the wheel till it bumps the lock but then back it off about 1/6 of a turn. 1/6 more turn doesn't get you turned around much faster anyway.
It takes a while to remember but you learn.
Now I don't even hold the wheel on my Chevy against the lock any more though it probably doesn't hurt anything on that.

NoNewParts · Dec 17, 2014

age
old stuff, big pressures......something/everything will eventually fail. PR valve, hose, cylinder....given enough time, that pressure will find it's way out somewhere.

ps, Machinery, Man, or Beast......in most cases, if they start to scream....it means.....'don't do that'....

Sean in PA · Dec 17, 2014

(quoted from post at 09:57:59 12/17/14) thanks! Didn;t know it was a sin to turn the PS all the way to the
lock!

I didn't say it was, at least when everything is working properly and not already damaged.

I gave you several possibilities of what might have happened if things weren't working properly or if things were already damaged.

Power steering 841

William Fissell

Member

Sean in PA

Well-known Member

William Fissell

Member

Ultradog MN

Well-known Member

NoNewParts

Member

Sean in PA

Well-known Member

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