Technical Power Steering Humming Noise

Hi All,

I installed a Monroe power steering actuator in a 1949 Packard.

The PS system works nicely and there is no leaks. The problem is that there is a "humming" sound and odd vibration when the steering system is in moderate load such as when the car is stopped and the steering wheel is moved left or right. Driving down the street it is smooth and quite.

The pump I used is a 1953 Chrysler 6 volt generator with a power steering pump mounted on the back.

I purged the system of air by running the PS actuator to its full length of travel with the steering gear disconnected and ran it for about 30 minutes and no reduction in noise. The belt is tight and is not slipping.

Are there any power steering guys out there that can leand some suggestions???


THANKS!!!

Bill

 

It is the byp*** valve fluctuating

 

Are you using a high quality power steering fluid? I've purged transmission fluid out of too many power steering units to count because it doesn't have the proper stuff to help keep a power steering pump from making a bit of noise. It might also be worth a trip to the GM dealer and get some genuine GM power steering fluid rather than the stuff at the parts house. It's not cheap but I've had a lot better luck with it helping quiet down a pump that is in good shape but still makes noise.

 

>It is the byp*** valve fluctuating

How does one stop the byp*** valve from fluctuating? Do you increase hydraulic pressure to make it stop (like adding more washers below the spring)?

Does anyone know the PSI output of the Chrysler pump and/or the PSI requirement of the Monroe external PS actuator?

 

Does one simply add a washer to the byp***i valve to increase the line pressure and that will stop the humming sound?

 

Does anyone know the PSI output of the 1953 Chrysler PS pump and/or the PSI requirement of the Monroe external PS actuator?

 

Then there is the old saw about why it hums,-- "It doesn't know the words."