Frustrating way to start with the PC

D

dshreter

New member
So I recently purchased a large porter cable 7424 polishing kit and I've been having a heck of a time with both the PC, and my polishes. Well I've finally figured out half of whats wrong. The rivets on my backing plate rub against the counterweight, making the pad unable to spin freely, instead it has to follow the path of the counterweight. Well, before I'd figured this out the PC was operating very loudly, and vibrating a lot, and was very frustrating. I'm sending the PC and backing plate back now. Anyone run into this problem before? Is my PC counterweight sitting too high? Is this a messed up backing plate? I'd really like to avoid running into this problem again.



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I think the PC isn't put together quite right which is the reason the backing plate hits the weight. If it makes any sense, it looks like the counterweight moves up and down within the plane of its rotation. Also, the spindle bolt looks a bit off axis. After having jammed it with the backing plate and all the loud clacking, even if there was nothing wrong with the PC when it arrived I couldn't be certain that its still fine at this point.



I'd rather avoid extra rounds of calls to customer service and shipping things across the country twice if its possible for me to take care of it in one step. I guess nobody's run into this issue before, and I couldn't find any other similar complaints on the forum, which makes me think its not a simple compatibility issue since I'm sure a number of people have ordered this combo from autogeek since they sell it in several of their kits.
 
Don't know about the other problems, but the spindle bolt is supposed to be off axis since it's a random orbital. I'm not sure exactly what the problem is from the pictures, but I'd try to make sure whether the PC really has a problem.
 
If you imagine three axes, x y and z, x and y are in the plane of the pad, and z is the direction of the backing plate spindle, i mean the z axis of the receiving bolt is tilted. I realize it's not supposed to be in the center of the tool.
 
There's supposed to be a fiber washer between the backing plate and the spindle; that will give you the clearance you're looking for. Sometimes they get lost, they seem to stay on some backing plates better than others. Look in your PC box for it; it's black.
 
There's supposed to be a fiber washer between the backing plate and the spindle;
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OHHHHH, that makes a lot of sense! They need some better QC on those washers.. I'll don't think I've got one in the box but I'll look.
 
I don't know if they are supposed to stay on the backing plates or what...most plates seem to come with one and they usually seem to be "threaded" on, but I have lost them before.
 
Yeah the backing plate is missing the washer ;) The one on my backing plate with rivets is about 2-3 mm thick. The one on my backing plate without rivets is about half as thin.
 
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