Where do I get a manual for aToro 51412 trimmer

If you have the model number, go to Toro.com and click on Master Parts Viewer. Type in the model number, choose assembly drawings, find your part and the part number and bring it to a Toro dealer to order it. You can also order the part online through partstree.com.

ALM Manufacturing
Part number TR035
http://www.almmanufacturing.com/en/grasstrimmer/grass-trimmer-parts/toro/item/1845-alm-tr035-spool-and-line.html

it may have stretched and needs a new belt there is a spring tensioner that can only go so far

All I can do is refer you to the manufacturer's instructions. See page 5 after downloading your user manual. If you can not turn the cap off, then the cap is possibly cross threaded onto the shaft end and/or the threaded end if the driveshaft is stripped. See if the user instructions are of help to you.

http://www.toro.com/en-us/Homeowner/Yard-Tools/Trimmers/Pages/Model.aspx?pid=51347-11-Inch-Electric-Trimmer

Here is a parts and diagram breakdown on your machine. It also includes a list of any and all parts that you can purchase to repair it.

http://www.ereplacementparts.com/toro-51430-500000159999991985-trimmer-parts-c-121776_123781_124021.html

The timer SMART manuals that Toro has for the ECx models can be found here:

http://www.toro.com/home/customercare/interactivemanuals.html#6

If your manual is not on that page you will have to use the Toro "contact us" using this link:
https://homeownersolutions.toro.com/portal/server.pt/community/contact_us/223

Here are the 2 ECx manuals listed:

http://216.213.143.2/ProAuthor/ManProc.cfm?&sk=4253770A%2DE287%2D11DF%2D9262%2D00D0B789305D&&ProcID=8342&ManualID=222&ProductID=-1&Edit=No&Skill=1&Lang=-1

http://216.213.143.2/ProAuthor/ManProc.cfm?&sk=4253770C%2DE287%2D11DF%2D9262%2D00D0B789305D&&ProcID=8342&ManualID=256&ProductID=-1&Edit=No&Skill=1&Lang=-1

Thanks for choosing FixYa,

Kelly

Your Toro electric trimmer parts are readily available through www.partstree.com . However, to avoid having to pay $10 in shipping for a $5 part, you should try to find your local Toro dealer. They probably have the part in stock. Go to www.toro.com and search on the dealer/distributor locator to find your closest dealer.
You will need to know the model number (5 digit) and serial number for your trimmer. These can be located on a small sticker on the trimmer.
Good luck!

If you enter your model number on this site, you can get a complete parts list that should include the charger.
https://homeownersolutions.toro.com/portal/server.pt/community/product_center/225

If you use this link:

http://manuals.mtdproducts.com/mtd/Public.do?BrandCode=10001

Then type in your model and serial number, You can download your User's manual. Toro is pretty fussy about handing out manuals hence the model number AND serial number are required in their site.

Thanks for using FixYa,

Kelly

flooding out...change the air filter...