Posted by Howard H. on July 04, 2016 at 21:38:15 from (75.117.255.96):
Bought a really nice old Ford 1973 F700 grain truck a while back - and everything is great, except the cable to the hydraulic bed lift was broken. The widow lady said it worked fine, "you just have to crawl under there and tap it with a hammer..."... And was she ever right about that!
I guess the broken control cable was a symptom, not the problem, because the spool valve shaft in the box is really tight... It takes either some light taps with a hammer - or a pry with a 2 ft lever...
I pulled the shaft out expecting to find it scored, but it wasn't. I put it in the drill press and polished it till it gleams with various grits of body sandpaper (1000, 1500, 2000, 2500). Trying to keep from making it TOO loose - I sanded and polished 7-8 times, cleaning & refitting it each time and was really surprise to see that after all that it still just about as tight as when I started.
I then took a brake hone and honed the cast iron block, thinking maybe a burr or something was hanging, but it didn't help either. As close as I can feel - and as close as I can see - both the housing & the shaft are perfectly smooth...
So my questions are - can a machine shop polish down this shaft a couple of thousandths or so, if the body putty sandpaper wouldn't touch it?? Any guesses as to if it was just made tight - or can they seize up or warp over time?? The ends of the shaft are not super hard, because a file will easily smooth up the very ends of the outer part of the shaft...
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