carbon brushes - graphite blocks which transfer mains power to the copper segments of the motor - located at the other end of the motor from the drive pulley. Theyre probably worn down. They're quite cheap parts and easy to replace - the holders are plastic or bakelite and are generally held in with screws or plastic clips. Also, look at the copper segments they run on to check for burning or pitting. If the segments are burnt or damaged you need a replacement motor or a replacement armature (motor part) if you can source one. Occasionally may be a fault in the motor drive circuit board - in which case replacement of board only real option.
If youre frail, you really need someone to help as the machine will need pulled out and the covers removed. switch off at mains first!!
Check out my site for info: www.2ndwave.co.uk/manual.html
Check out these sites for spares : www.4directelectricals.co.uk
http://www.ukwhitegoods.co.uk
http://www.domesticspares.co.uk
washerman, March 2008