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1968 Ford 3400 power steering problem

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Tractor Guru

Joined: 10 Aug 1998
Posts: 10912

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PostPosted: Wed Nov 07, 2007 12:16 pm    Post subject: 1968 Ford 3400 power steering problem Reply to specific post Reply with quote

I have an old friend who owns a 68 Ford 3400 with power steering. It keeps blowing the seal at the bottom of the steering shaft the way I understand what he is telling me and caused it to push oil out the top of the steering shaft jacket. He says it actually pushes the seal out of the housing.

What is the cause and what is needed to fix it so the pressure won't push the seal out?

Thanks, Zane
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Tractor Expert

Joined: 05 Mar 2009
Posts: 1825
Location: Jefferson Maine

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PostPosted: Wed Nov 07, 2007 4:39 pm    Post subject: Re: 1968 Ford 3400 power steering problem Reply to specific post Reply with quote

That seal should not be able to push out of the shaft housing as it bottoms out on a machined surface. The pressure needs to be checked as it only runs 600-700 psi. The most common causes of repeated failure is a grove worn in the shaft were the seal rides and rolling the lip of the seal during assembly. A machine shop can build up the shaft and turn it back down to it's original size. Using grease on the shaft can help prevent rolling the seal during assembly. The valve assembly also has a check valve that must binstalled in the proper position and there is adustment required to set the load on the spring washers with the nut on top of the valve.

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