Excessive vibration normal w/ 7424?

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inssane3gt

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Hello,
I bought a 7424 package from AG this month. I got a great deal and service was superb. Thanks AG.

I used my 7424 today. When I first began using it at speed 5, vibration was definitely noticeable but not excessive. After a few hours, the vibration was excessive to the point that I couldn't hold on to the side handle at speed 5. I was examining the 7424 and noticed that I was able to tip the backing plate back and forth quite a bit. When I did this, the backing plate was not perpendicular to the machine.

Is my 7424 defective or is this normal?

Marty

I forgot to mention that I'm using a 5" backing plate w/ a 5.5" pad and the correct counterweight. The backing plate is tightened and there is a spacer.
 
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That doesn't sound normal. The PC does vibrate quite a bit, but the backing plate shouldn't have any play in it...at least mine doesn't. I'd double-check to make sure it's attached correctly. If it is and the problem persists contact AG, I'm sure they'll make it right.
 
Thank you for your reply sir. I've got the 7424 in front of me right now. I took the backing plate off. I'm able to rock the nut where the backing plate screws into back and forth quite a bit. The entire part with the counterweight is shifting. I'll contact AG.

Thanks,
Marty
 
You may also want to consider removing the side handle. I haven't used it, but I've heard mention that the machine seems to vibrate more, or be harder to handle using the handle. I like just having my hand directly over the pad. I feel more in control.
 
GearHead_1 said:
I don't know whether your PC is under warranty or not. If it isn't here's a link that discusses in detail how to replace the bearings in the head of the PC. Mods, if this link isn't allowed please delete. I've also included a parts diagram and parts price list.

http://www.detailcity.org/forums/car-polishers-buffing-pads-accessories/20054-how-replace-bearings-w-pics.html?highlight=porter+cable+bearing

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/portercable/7424/
Click to expand...

Thanks for the reply. I bought the machine this month and only used it for one day. I don't think there will be a problem getting it replaced. But thank you for the links, I did read the diy bearing removal as it will come in handy down the road.

Marty
 
Grimm said:
You may also want to consider removing the side handle. I haven't used it, but I've heard mention that the machine seems to vibrate more, or be harder to handle using the handle. I like just having my hand directly over the pad. I feel more in control.
Click to expand...

When I first began polishing I had the handle on with moderate vibration. As hours passed I had to take the side handle off and place my other hand directly on top as you mentioned due to the vibration. I was able to finish the polishing. I waxed by hand afterwards.

Marty
 
I took another look at the machine. I don't think the bearings are faulty because if I hold the housing (where the counterweight screws into) down, there is no play when shifting the nut (where the backing plate screws into). But if shift the nut without holding anything down there is about 1/8" play vertically and horizontally.

Happy Holidays,
Marty
 
inssane3gt said:
I took another look at the machine. I don't think the bearings are faulty because if I hold the housing (where the counterweight screws into) down, there is no play when shifting the nut (where the backing plate screws into). But if shift the nut without holding anything down there is about 1/8" play vertically and horizontally.

Happy Holidays,
Marty
Click to expand...
I'll be interested to see what you find out with this machine. Keep us posted.
 
Insane3Gt
I am familiar with this machine use been using one for years as a sanding machine.
Remove pad, take out the to screaws with washers, that hold the weight.
Now you should be able to pull out the bearing. Under this bearing is a philips screaw that holds a hub to the shaft.
Had to replace this hub once. You might be able to take the woble out by tightening this screaw.
lol
 
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Ritchie Lee said:
Insane3Gt
I am familiar with this machine use been using one for years as a sanding machine.
Remove pad, take out the to screaws with washers, that hold the weight.
Now you should be able to pull out the bearing. Under this bearing is a philips screaw that holds a hub to the shaft.
Had to replace this hub once. You might be able to take the woble out by tightening this screaw.
lol
Click to expand...

You know I was thinking about that. I saw that bolt in ony of the diy bearing replacement photos from the link posted above. But it wouldn't make sense to start taking things apart when the machine is less than 30 days old and I should be able to get it replaced.

I'll keep you posted.
Marty
 
insane3gt
In the exploded veiw #128 eccentric hsg kit. This thing started to woble one day took it apart tightened the screaw, fixed the woble. I then ordered new #128, felt that it did not fit tightly onthe shaft, the shaft was also steel, and the eccentric hsg #128 a softer metal. This machine was several years old, still going 15+ years.
Oh Hell Yea seems to me should have some kind of warrenty coverage. What do you want to bet they just tight this screaw? Then again your problem could be differant. Last time I went to a tool repair shop they charged me $75 for labor 1 hr & 15 min, $1 a minute.
Again Lots Of Luck!
Merry Christmas
 
Sevenrd said:
That doesn't sound normal. The PC does vibrate quite a bit, but the backing plate shouldn't have any play in it...at least mine doesn't. I'd double-check to make sure it's attached correctly. If it is and the problem persists contact AG, I'm sure they'll make it right.
Click to expand...


I agree......why mess with it....send it back...........;)
 
The new pc is on the way. AG provided a return shipping label for the defective pc. Thanks AG and everyone for your help.
 
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