PC 7424xp burning up after second time using...

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HFDFyreFytr

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OK, got a PC7424xp from Autogeek with the Menzerna package a few months ago. I was studying for a promotional exam at work, so it sat for a few months before I even opened the box, but I finally did. I polished my one truck and had no issues and the truck turned out good.

Just started my other truck a day ago and it is burning up! It actually melted the backing plate and pad on the unit!!! I didn't notice anything until it was already burnt. When I took the pad off, half the pad stuck to the backing plate and the backing plate was soft and partly melted.

WHAT THE HELL!!! I was using an orange pad (CCS) with Menzerna SIP.

So, I just got off the phone with AG and they said....Wierd. Never heard of that...send it to Delta Porter Cable. Now I have a half polished truck that I am trying to get sold and I have nothing to finish it with and who knows how long this is going to take to get fixed.... :(

As far as never hearing of this, I did a search on this forum and found a number of cases of the same thing, including the front page of this forum I am on right now...

Anyway, really would have liked a better solution than this. I Kinda wanted to trade it for the flex or the GG model considering I no longer have faith in this unit any more. I kinda understand AG's take on it, but it just sux. I am probably going to end up having the truck for another payment cycle which sux. The reason I was polishing the truck was to hopefully get more money out of it and now I am going to end up with another payment and insurance payment.

Anyway, enought rambling....Very dissatisfied customer with a half polished truck, burned up backing plate and melted pad....:dunno:
 
I have had a backing plate do a similar thing and I chalked it up to a lousy backing plate. It was filled with a kind of foam rather than being one solid flexible piece and the stresses of detailing made it disintegrate. Symptoms I noticed before it went included pads feeling hot in the center and a smell of melting rubber. It turned out that the center of the plate was spinning inside of itself slighlty.

I thought the polisher was transferring heat to the pads because it was also feeling excessively warm, but it was actually the opposite that was occurring.
 
Now that is interesting... That is what happened on mine as far as the burning in the middle. My machine literally put a blister on me when I toughed it though. The shield part was HOT! The casing was HOT! The handle had no heat in it at that point though, so I did not feel it. I will have to check out my backing plate and see if that could be an issue though.

Thanks for the input. That is why these boards rule! Someone has had the same issue before and can usually point you in the right direction or at least give you options... :props:
 
Check the counter weight as well. Make sure it isn't making contact with the housing.
 
Well, I guess I coulda checked this before I responded. The backing plate is not spinning in itself. It has 4 rivet looking guys in there. I put the wrench on it and tried to turn it while holding the top and it would not turn at all. There was no flex at all...

Oh well. Any other suggestions?

Anyone in Houston wanna come finish my hood and front left quarter panel. That and the pillars are all I have left. I left the pillars because I was doing this at work and didn't have masking tape. I didn't want polish on the rubber... The hood I just cracked the hood and put towels between the hood and windshield....
 
Sounds like the spacer washer isn't on the BP.

There should be a washers (1/8" or so) goes on the threaded portion PRIOR to putting the plate on the spindle.

Without it, the BP CAN make contact with the housing, hence...no rotation.

Make sense?

Bill
 
BillE said:
Sounds like the spacer washer isn't on the BP.

There should be a washers (1/8" or so) goes on the threaded portion PRIOR to putting the plate on the spindle.

Without it, the BP CAN make contact with the housing, hence...no rotation.

Make sense?

Bill
Click to expand...

I agree. Double check this. The only time I've ever had any other issues with a DA is when I spaced out and didn't notice I had no spacer washer between the backing plate and the machine.
 
BillE said:
Sounds like the spacer washer isn't on the BP.

There should be a washers (1/8" or so) goes on the threaded portion PRIOR to putting the plate on the spindle.

Without it, the BP CAN make contact with the housing, hence...no rotation.

Make sense?

Bill
Click to expand...

The washer is in place. There is also no wear marks on the back of the backing plate at all. There is no signs of damage from the back side. This is not the issue.
 
Call Meghan up...I'm sure she'll do something about it.
 
BillE said:
Sounds like the spacer washer isn't on the BP.

There should be a washers (1/8" or so) goes on the threaded portion PRIOR to putting the plate on the spindle.

Without it, the BP CAN make contact with the housing, hence...no rotation.

Make sense?

Bill
Click to expand...

BINGO!!

I was waiting for someone to mention this! :props:
 
ok I did this the frist time I used the pc. I did was to use the backing plate a pad and a mf bonit to take off wax/sealer on setting 6 and in 10mins it got so hot it was over. but then I use the one they give you with the pc and black plastic backer and white foam pad glued to it with the mf bonit over it and all was good.
 
master detailer said:
ok I did this the frist time I used the pc. I did was to use the backing plate a pad and a mf bonit to take off wax/sealer on setting 6 and in 10mins it got so hot it was over. but then I use the one they give you with the pc and black plastic backer and white foam pad glued to it with the mf bonit over it and all was good.
Click to expand...

I have the backing pad that came with it, the washer installed, the counter weight that came with it, and I am using a 5.5" CCS orange pad with Menzerna's SIP. Nothing out of the ordinary....I don't think.... Speed is 5. I marked the backing plate like I read to do so I could easily tell when it quits rotating...
 
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