I too, rebuilt a Weaver lift a few years ago, 9000 lb capacity symmetrical, from the ground up. I have an AFH 90. Mine doesn't have the plastic blocks but has bearing rollers on each lift carriage for guidance. I too replaced all of the chain guide roller bearings while I was at it. At the time I bought mine, my son worked at a small local company doing powdercoating. I had bought my Weaver in Oct., and tarped it over for winter safekeeping. Well as it turned out I needed my trailer as I started a new job and had to empty my trailer to move my tool chest (Matco 4S top and bottom) there.
I asked my son if he could ask the boss if he could offload the lift there for just a few days. (they had forklift, this thing was HEAVY)
I went to pick up my lift like a week later and they had it buried to where I could not get at it.... but they weren't worried about it sitting there
When I did get my lift back all the pieces were freshly powdercoated, the columns were Petty Blue, as are the lift carriages... the arms and the hydro fluid reservoir are Chrysler Orange, the lift adapters themselves are also Petty Blue.
I rebuilt the cylinders while it was apart and rattle canned those black, along with the motor. Mine came with 2 new-in-package oil pumps, which are housed within that fluid reservoir. The PO had bought those back in the day "just in case". Upon getting it back operational I noticed how noisey the pump was, though it seemed to work fine. I put one of the new pumps in, and wow what a difference in sound.... much quieter.
I like the symmetrical design, because i can pull in or back in and lift the same, either way... I don't like having to try and open the car doors while the lift is in contact with the underside. The floor plate has never bene a problem.
I don't remember the issue but there was one with the safetys. I had my cousin take those to work while it was apart and remachine the center hole in the "pork chop" that engages the locks and bush them to clean up the slop, the safetys work much better now. My Weaver was built in 1986 I found out, Weaver was bought out by Rotary in '88 or 89.
This thing is HEAVY! I had to borrow a tractor and took off the bucket, used a chain off the bucket arm to stand mu posts up and set them. I also cut templates to the shape of the base, from some scrap Luan to help in layout and positioning.
We have $~1100 into it, the only thing that comes close to the heft of this lift, would be a Mohawk. Most shops I have been in have had Rotary lifts, the older ones are fine, the newer ones are like toilet paper, compared to the thickness of the columns on this one!
And yes, most common parts can be had for MUCH cheaper than SVI wanted, and I don't have to deal with a company that won't sell to a "little guy" SVI said I had to find a damn "authorized dealer" to buy ANYTHING that they could offer me..... screw that.
A little bit of work, yeah but WELL worth it!!!! I would do it again in a second.
(and if my son gets the house he is trying for, I have a feeling that I will be doing just that.... ) If I can work off a lift at work why should I work off a jack and tripods at home, even on my own cars?