Brian, I use mine for pushing snow, and also a bit at work moving dirt but mine isn't making me any $$$ till I go to sell it if it's not junk when that time comes. I picked my 621C up for $15,000 it was used for logging in MS and they BEAT it BAD with a grapple on it. The lover pivot bearing grease zerk was broken off so that tells how often it was greased. When I replaced that and started greasing it the excess came out pure orange from rust. I am sure one of the 2 bearings on the bottom is gone which is allowing the machine to pretty much support it's self on the upper bearing and the pin slides up and down in the inner bearing races on the top almost 1/4" all that movement has caused the fixed holes in the front half to become oval I am sure (when I pressure wash it nice and clean I can see some small signs on the edges of that bore being mushroomed from the pin movement). The more I think about it, what Ray is saying as that pin moving up and down in the upper bearings it's almost for sure transferring that rocking force into the bearings and making the cup that holds them become a bit of a oval to match the outer bore that holds the pin.
Fast ST. I guess what I have concluded on mine is that if the lower bearing is worn out that's the area that's designed to support the loads so when there is play there it allows the machine to go up and down in the pivot and the more of that that happens the more it wears the fore aft bore of at least the upper pin bore and maybe the bearing cup.On the Case they use a plate that bolts on the bottom of the lower pivot that in turn pushes the very bottom bearing into the race and there's also 3 bolts that go into the lower pin that pulls it down pulling tension down on the upper bearing into the race thus supporting the loads. Mine likes to snap off those 3 bolts in the pin when you bang it around too much because of all the play. I now find myself looking at EVERY other brand of wheel loader and how the center pivot works Kawasaki looks to use the upper bearing to support the load force and the bottom one looks to be just the idle one so to speak.
I guess my biggest question is at work we need to move 3000-5000 yrds of material VERY soon I have already moved that much with it since I have know of the problem trying to be cautious with it. Do they rent a loader and save mine the wear and tear, Or if I use mine and they put the $2000 or so for a rental towards fixing my bore then I can at least get most of my repair paid for. I have removed my lower pin and had the bolts extracted and replaced a couple times now that helps a lil also took off the bottom plate and removed the shims and flipped it over since there is a large grove worn in it from the lower spacer hammering on it. I might have removed 1/8" of play but I don't thing there is much you can do to shim the lower bearings when they are worn because of how close to each other they sit I doubt you even have 1/4" of a space between the inner races before they bottom out into each other. ANYONE who know's anything about this area PLEASE correct me if I am wrong and I know how bad it feels in my butt with it banging in the center. Do I need to park it till I get it fixed am I just going to make the loader into scrap by running it longer as it is? Rough guess from a visual stand point that play looks to be 1/2" to an inch of movement the loader arms move for and aft from the cab at the pin that looks like 1/4" up and down movement on the pin. I am sure one of the lower bearings is GONE it recently spewed out the spring from the grease seal on the top seal of the lower pivot.
