PC7424 vibration

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don04

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I know this has been discussed here many times. I have been searching and have not really drawn conclusions.

I have a PC 7424 non XP. I bought a number of years ago from I don't remember where.

I am about ready to throw the darn thing out. The vibrations when using it are driving me nuts. After working one panel, my hands and arms itch/hurt.

I have an abundant supply of Lake Counter 6.5" pads, and the original backing plate. View attachment 54713

The 6" counter weight is installed on the machine.
I have learned that the backing plate is a good start to try and fix this. Suggestions i have read suggest 5" flex plate for 6.5" pads, some say the 6" backing for 6.5 inch pads.

What do you recommend to make this DA usable? different pads? new backing plate? different counterweight?

I am at my wits end and would rather not buy a new polisher. I certainly will if that is the recommendation.

TIA
Don Fitz
 
Definitely go to a 5.5 pad/plate, and if using the 6" set up, stay under speed 6.

I use one of those all the time - no vibration, unless I have the 6" set up on speed 6.
 
I have the PC and use it a few times a year. I generally stay under speed 6, but that speed also seems to work well with my technique and the products I use (speed 6 seems to dry polish out too quickly for me). I have heard that some people use padded work gloves as well. I haven't tried it, but it might be worth a shot.
 
That should be a 5" Backing Plate for 5.5" Pads.

And for Pads, choose the thinnest in the 5.5" size that can be found, either Microfiber, or LC Thin Flat, or LC Thinpro in the 5.5" size.
 
Anti-vibration Gloves are a
tremendous asset in reducing
the pain/agony of tool-induced
Vibration White Finger/Neuropathy.



Bob
 
I have the same machine and still use it after 4 years.

I find the pads are the variable.

Currently using the ThinPro 3.5 and 5.5 pads and they work great with this machine.
 
Thanks for all the help so far everybody...

Suggestions for backing plate? 5" or 6"? I see several suggestions on AG, is one better than the others? I usually choose LC pads, should is get their backing plate, or the GG backing plate with the vents?
 
don04 said:
Thanks for all the help so far everybody...

Suggestions for backing plate? 5" or 6"? I see several suggestions on AG, is one better than the others? I usually choose LC pads, should is get their backing plate, or the GG backing plate with the vents?
Click to expand...

LC backing pads are really good. The Meguiar's plate is my favorite. Thin and dense. Worked beautifully with my Hydrotech pads.
 
I just bought the 5" Griots vented because of the heat that seems to come from my Lake country backing plate.
 
I initially bought the 5" Lake Country Yellow Urethane Backing Plate for my PC7424XP when I bought it, but in more recent times when it became available also then bought the Griots Garage 5" Vented Backing Plate.

No problems with either, but feel the GG Plate might hold advantage with the Vented Holes, thus helping Plate and Pads stay a bit cooler.

Most here seem to say, that 5" Plate and 5.5" Pads is the way to go as the largest Pad-Plate combo, a larger Plate and Pads hampers reliable Pad rotation on the PC Machines.
 
don04 said:
I know this has been discussed here many times. I have been searching and have not really drawn conclusions.

I have a PC 7424 non XP. I bought a number of years ago from I don't remember where.

I am about ready to throw the darn thing out. The vibrations when using it are driving me nuts. After working one panel, my hands and arms itch/hurt.

I have an abundant supply of Lake Counter 6.5" pads, and the original backing plate. View attachment 54713

The 6" counter weight is installed on the machine.
I have learned that the backing plate is a good start to try and fix this. Suggestions i have read suggest 5" flex plate for 6.5" pads, some say the 6" backing for 6.5 inch pads.

What do you recommend to make this DA usable? different pads? new backing plate? different counterweight?

I am at my wits end and would rather not buy a new polisher. I certainly will if that is the recommendation.

TIA
Don Fitz
Click to expand...

Mine is the XP so maybe that is why mine is fine.

There was a post on here about a 3" DA that had bushes installed badley from new (they were not seated properly).

The other thing was lack of grease in the inner gear housing.

Don't know if worth it to take apart and inspect, but I would before I threw out.

There might be a "Tool Doctor" franchise near you that could do it for you, or call Porter Cable for authorized repair shop in your area.
 
Crispy said:
Mine is the XP so maybe that is why mine is fine.

There was a post on here about a 3" DA that had bushes installed badley from new (they were not seated properly).

The other thing was lack of grease in the inner gear housing.

Don't know if worth it to take apart and inspect, but I would before I threw out.

There might be a "Tool Doctor" franchise near you that could do it for you, or call Porter Cable for authorized repair shop in your area.
Click to expand...

Yeah, that was me Crispy who found the issue on my GG 3" with cracked Brushes with only about an hour of use on this machine.

And that probably most if not all of these machines over a period of time have internal grease lubricants slung away from their gear sets due to heat, and centrifugal force.

A machine like the PC7424 should not be too hard to take apart and put back together if you are careful, and pay strict attention and care to what you are doing.

There are places online where some of the parts for these older machines can be acquired. Parts such as the main motor though are not cheap, and probably in such instances the machine may have to be trashed if there are more serious problems. Doesn't make sense if one has to spend $50 or more dollars then to repair such an older machine.

To then just invest that money for a newer one of personal choice.
 
IMO your 6" counter weight and 6.5" BP and Pads are way to big for the PC7424XP. I have the PC7424XP and it is an awesome secondary DA. My Flex 3401 is my primary, however, I use the PC for applying sealant/wax and will use it for smaller corrections/polishings. I no longer go more than 4". I use it for the smaller challenges. I would suggest using smaller pads 5" max and a smaller BP. As for the counterweight I can't comment as I have mine set up from the factory.

Try the smaller pads and see the big difference.
 
I have the 7424XP and yes, there is some vibration with this machine, but not terrible. Ive stuck with a 5" backing plate and 5.5 pads though.
 
Crispy said:
Mine is the XP so maybe that is why mine is fine.

There was a post on here about a 3" DA that had bushes installed badley from new (they were not seated properly).

The other thing was lack of grease in the inner gear housing.

Don't know if worth it to take apart and inspect, but I would before I threw out.

There might be a "Tool Doctor" franchise near you that could do it for you, or call Porter Cable for authorized repair shop in your area.
Click to expand...

The tool is a breeze to disassemble/reassemble with just a little mechanical knowledge.

And I agree to always check the brushes, armature, and cord connections while the machine is disassembled. Just good practice.
 
Does anyone have an exploded view of the pollisher?

That would be very usefull if you were doing it the first time.
 
From Porter Cables site

1 - V1?

933f2776c6e6780b955262804d46b7b8.png


2 - V2?

f47d8937b55c41e7da5066868c128094.png


I think they are both the same pic.

Sent from my iPhone using Tapatalk
 
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