Nylon gear has several of its teeth. 2 gears are

I would if I were you. The use of nylon gears help to quiet the operation of the unit., Putting a thin coat or grease will extend the life of the gears. Don't put too much on, or it will collect dust and dirt and possible wear out the gears quicker.

will be difficult to get unless the manufacturer sells spares
the cost of the part (if available ) and labor chargers will exceed a replacement unit cost

Maybe, without knowing what your are working on it is nearly impossible to help you.

contact the local service agent or consider a new unit as the cost of repair may exceed a new unit

yes its inside the unit

Best bet is to look at eBay ...
often see "faulty" Dymo Labelmakers going cheap
cannibalise it for what you need.

My Sony CDX-636 has a mechanisim to lift and lower the CD reading carriage. It consists of a small motor and two nylon gears. the smaller of the gears has stripped a number of teeth which makes the carriage move up and then slip back. I need a new gear wheel. where can I buy a new gear? I am living in Palmdale, california

You can buy one on ebay for about 40 US dollars and use the gear or just replaced the whold thing for 40.00 dollars.You choice

Good luck

http://search.ebay.com/px110mx-shredder_Shredders_W0QQcatrefZC6QQfsooZ1QQfsopZ1QQftrtZ1QQftrvZ1QQsabfmtsZ1QQsacatZ67095QQsaobfmtsZinsifQQssPageNameZRC0021QQ_trksidZp1638Q2em120

go to the shop and buy a drive gear