Thread Number: 499
Fluctuating motor speeds 		[Down to Last]

Vacuumland's exclusive eBay Watch:
scroll >>> for more items --- [As an eBay Partner, eBay may compensate vacuumland.org if you make a purchase using any link to eBay on this page]
Post# 4804   11/28/2006 at 10:35 (6,358 days old) by 74simon ()        

I have a couple of machines that have a disconcerting habit of having motors that will suddenly change pitch (sounding like they're slowing down or being strained), even though the motor bearings seem fine and no undue strain is being put on the motor. I suspect that both machines are the kind that hadn't seen much if any use for years, until I got my mitts on them. I'm never sure whether to keep them running in the hope that they smooth out, or whether they need attention lest they burn out or worse! although I'm more worried about injury happening to me than to the machine...

Post# 4806 , Reply# 1   11/28/2006 at 10:56 (6,358 days old) by hoovercelebrity (Germany)        
My guess...

 Is that the carbon brushes in the motor are worn out... That's usually what it is if a machine speeds up and slows down on its own.

What kind(s) of machines are they?

~Fred

Post# 4807 , Reply# 2   11/28/2006 at 11:13 (6,358 days old) by 74simon ()        
Thanks Fred,

 One is a Hoover Junior 1354A. I've just compared the free-ness of the drive pulley with my smoothest Junior, and it seems very stiff in comparison, although it does turn evenly, and there's no wobble from worn motor bearings.

The other is a Hoover 652 which has been in storage for a couple of months. Again, there's no bearing wobble on the agitator drive shaft, but this time the motor turns freely. However, when I spin it by hand, there's a distinct clicking/rattling sound, almost like a stick being dragged along a picket fence or something. So I guess that that is dodgy carbons on that one. I've had this sound on this type of machine before, but as I'm not clued up on motor repair i've never known quite what to do about it!

Post# 5203 , Reply# 3   12/3/2006 at 19:46 (6,352 days old) by centralvacman ()        
check the comutator ,armature& fields

 worn brushes,weak springs,brushes sticking in the holders
open or shorting of armature can cause that.along with loose field coil assembly causing dragging on armature will cause erratic operation,one or 2 severly burned comm bars usually an open armature wire,


Forum Index:       Other Forums:                      


Comes to the Rescue!

Woops, Time to Check the Bag!!!
Either you need to change your vacuum bag or you forgot to LOG-IN?

Discuss-O-MAT Log-In



New Members Click Here To Sign Up.



                     

automaticwasher.org home
Discuss-o-Mat Forums
Vintage Brochures, Service and Owners Manuals
Fun Vintage Washer Ephemera
See It Wash!
Video Downloads
 Audio Downloads
Picture of the Day
Patent of the Day
Photos of our Collections
The Old Aberdeen Farm
Vintage Service Manuals 		Vintage washer/dryer/dishwasher to sell?
Technical/service questions?
Looking for Parts?
Website related questions?
Digital Millennium Copyright Act Policy
Our Privacy Policy