PC 7424 repair

Y

yachtfisher

New member
Hey guys



I was wondering if the PC 7424 is rebuildable ?



the head (pad holder) free spins with the machine turned off and turns with the motor running but no load can be applied or it just stops



Thanks
 
Thanks for the link



I am not really sure, if I had to guess it is like a pin or a one way sprag broke.



The motor runs full speed and the head spins, but soon as a load is applied to the pad it just stops spinning, even though the electic motor is still turning.
 
This doesn't sound like a brush problem as he said the motor is still running, just that the pad stops turning when pressure is applied.



The pad holder (backing plate) is designed to freewheel all the time. There is no direct or indirect connection with the driven motor spindle other than a free spinning bearing. With light to moderate pressure the pad should rotate as the eccentric shaft spins, providing you're using a polish to provide some lubricity. Too much pressure, too large of a pad or too dry of a pad and it will stop spinning and just "jiggle" with the movement of the eccentric.



What size and type of pad are you using?



What polish are you using and how much are you applying to the pad?



How long are you working the polish?



How much pressure are you applying (light, moderate or heavy)?



How much experience do you have using the PC 7424?



It sounds like it might be more technique/product related.



When I first got my PC I encountered similar problems and it turned out just to be my inexperience. I was applying too much pressure and using too little product. Once I learned to back off a little bit and used just a little more polish it started to work like I expected it to.
 
I'm not sure brushes are what you need. You say that the motor keeps running but the pad stops spinning. This just doesn't sound like bad brushes. If it was bad brushes the motor would slow down noticeably or stall. It could be as simple as using too much pressure or having your pad too dry. There is no forced rotation of the pad with the PC 7424. The pad/backing plate just freewheels by design. There is no sprague clutch or any other direct connection with the driven shaft. Start with the basics:



How old is the machine (hours of use - 10's, 100's, etc.)?



What type and size of pad are you using?



What polish are you using and how much?



How long are you working the polish?



How much pressure are you applying (light, moderate, heavy)?



Does the pad rotate with just the weight of the machine behind it? How about with light pressure? If you haven't already, mark the backing plate with a felt pen so you can see the rotation or lack thereof. Try to pin down under what conditions the pad stops rotating.
 
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