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520 power steering

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Lucas

04-14-2003 18:11:31




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I have a 520 and the powersteering acts a little weak when we got it it turned hard to the right but I followed the book and the adjustments so it steers with equal effort. It seems to have a hard time keeping up with the turnning of the wheel. I put a gauge on to test the pump and relief valve. when you turn all the way one way the pressure will rise to 1400 slowly like 10 to 15 seconds. could this be in the pump.

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Clooney

04-14-2003 18:56:31




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 Re: 520 power steering in reply to Lucas, 04-14-2003 18:11:31  
Lucas, it sounds like you might not have enough flow from the flow control valve. Try taking the cap nut off the flow control valve adjusting screw & turning the adjusting screw in a little at a time until it either steers easier or the wheels start fluttering. If you get into flutter back the screw off a little until it stops.



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lucas

04-15-2003 06:12:35




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 Re: Re: 520 power steering in reply to Clooney , 04-14-2003 18:56:31  
We tried the flow valve ,,,, had it turned in so far that we could no longer put the cap on tight and saw very little difference in steering , never got to where it would flutter



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Clooney

04-15-2003 06:56:14




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 Re: Re: Re: 520 power steering in reply to lucas, 04-15-2003 06:12:35  
Lucas, if the flow control didn't have any effect that probably means the flow is already higher then the flow control can effect, or the flow is so low it can't be effected. So that leaves either a weak pump, improper worm/sleeve adjustment, or internal leakage. Unless something is plugging the pump intake or you have a restricted return pipe, your problem is more than likely in the steering vanes. ~Probably your next test would be to do a vane leakage test. That test is in the manual, if you don�t have access to the test procedure post back�.
~If the vane leakage is high, or you have a broken vane pivot or stop pin, or the vane housing is scored, some of the oil could be by-passing the steering vanes & returning to the sump. Leaking vanes could also give you that slow pressure build as the vanes slowly try to seal with pressure & flow over time.
~If you pass the vane leakage test you might want to look at pump flow, or if it has always acted this way maybe someone at one time has set the worm cam spring too tight [they don�t wear to a tight spring, someone would have had to set it too tight]�
~It�s OK to keep the questions coming as that is a rather difficult system to understand but actually quite simple in operation�.

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