I've been looking for the service manual for the Viking Husqvarna Classica 120 with no luck. I've tried E-Bay. Any help would be much appreciated.

Question edited for clarity and correct order of make model.
Question moved for Cars and Trucks category.

Unfortunately there isn't one. Owner manual only. Service agents are factory trained, and have online resources, but generally they already know their way around inside all machines.

https://www.google.com/search?q=Husqvarna+Viking+Classica+100+service+manual

If it is stuck in reverse, there is help on Fixya from 2012.
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Owner's Manual only.

https://www.google.com/search?q=Husqvarna+Viking+Classica+100+Service+manual

Check out videos 3 and 4.

https://www.google.com/search?q=Husqvarna+Viking+Classica+100+reverse+not+working

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try this link
http://www.sewingmachinemanual.net/Sewing_Machine_Manuals/viking/Viking_5530_6030_6430_Instruction_Manual.htm

I have a white 666. I can email a copy of the manual that came with it. Tattered and old but complete. I would LOVE to get my hands on a service manual. No one around seems to know anything about them and I'm afraid to let just anyone touch it. I love that machine. It has outlived two portables.

Try [email protected] or www.sewing-machine-manuals.com look for Viking with the same model number

I have a copy. If you still need it, I can e-mail you a copy.

sounds like it needs servicing and cleaned. Suggest only using authorized husqvarna viking dealer for service. You can find your local dealer at the Husqvarna Viking website http://www.husqvarnaviking.com and selecting "dealers" link.

Yes, these parts should be replaced. Original parts are only available from an authorized Husqvarna Viking Dealer. The service/repair is very intense and should be performed by a certified Husqvarna Viking service technician through the Dealer. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.

Call Husqvarna at: 1-800-474-6437. They may be able to get you a photo copy of the original owners manual.

Suggest you contact an authorized Husqvarna Viking dealer. They can order you a user manual. Authorized dealers can be found at the Husqvarna Viking website - http://www.husqvarnaviking.com/us

Brief description of probably how to thread from looking at a picture of a Classica 90 machine which should be similar -

Thread sits on spindle on backside. Pull thread straight across to upper left backside and fit in the metal guide. It should pull easily with only a little resistance. Pull thread forward across top toward you. Let thread fall between the metal disks (doesn't matter which one if more than one) and pull thread straight down. Pull thread slightly to the left to fit under a hook of some type and back up to fit through the large hook that moves up and down when the handwheel is turned. Come straight back down to needle and thread through eye of the needle. Just above the needle should be a thread guide (sideways hooking looking metal piece), slip the thread through it to hold thread close to needle. Hope this helps. Otherwise a local authorized Husqvarna Viking dealer will be glad to help you. Good luck.