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Re: Electric power steering for my 8N

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Author  [Modern View]
Ultradog MN

01-15-2020 07:18:07

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The crux of this conversation is input torque. Plastic gears or otherwise, input torque is important and as of yet we have no basis for comparison.
I have overhauled a bunch of twin arm Ford steering boxes, both manual and power assist. Here are a few of my observations.
To begin with they are all nearly identical - from the late 8N through 1983.
A manual box always shows more wear than a ps box. Sector bushings are worn, adjusting screws on the end caps are adjusted in deeper because the sector teeth are more worn, balls and the ball nut are more worn.
A power steering box uses the exact same bottom end as a non ps box. They do very little 'work'. The work is done in front of the ps box. Those always show very little wear on the internals. Basically you just need to replace the seals, go through the hydraulic control valve and you are done.
You can always tell a manual box that was used on a loader tractor. No more adjustment on the adjusting screws, sector teeth you could shave with, twisted sector shafts, non reuseable balls and ball nuts, bent steering arms and cracked housings.
These are all symptoms of too great of input torque and of course abuse and impacts.
The draglink in front of the steering cylinders is also much heavier than non ps draglinks. Going back to my numbers (100,150, 200) here if you guys do the experiments and can tell me what the comparative inputs are for the eps and assure me that the torque input (and torque resistance to an impact) is not over my hypothetical 150 I will stop arguing against this eps add on - at least on mechanical grounds.
In the mean time, I'm always up for a good debate.

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