(ET) Steering problem identified.

[Christopher Zach <czach computer org>]

Ok, I think I figured out what is going on here.

The trick is that the sector gear and pinion both ride in the same 
block. It's a cast steel block that is attached to the E20 frame by two 
bolts.

Over time these bolts have allowed the block to "migrate" forward. Not 
much, maybe a 1/20th of an inch. But that is enough to get dirt behind 
the block (where it keeps it from going back) and more importantly it 
changes the lash angle between the sector gear and pinion. Thus the 
pinion loses contact and it slips.

Solution right now involves moving it as far back as possible, 
tightening the bolts, then reassembling the system. Should be able to 
finish it tomorrow.

What a pain. But at least I know I'm not insane.

Chris