The Tecumseh carburetor used in the Mastercraft model 314420515 snowblower is likely the Tecumseh 640084B carburetor. This carburetor is commonly found in Tecumseh snowblower engines and is used in various snowblower models.
This manual is available at managemyhome.com http://www.managemyhome.com/mmh/products/ManualSearch.action?sid=MMHMxSearsx00019&product.modelNumber=31AS6HEG799&product.brandName=MTD
http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0909323.pdf
You probably won't. They were never published separately, only with the tool.
Craftsman recommends using SAE 5W-30 oil in the 536.88150 snowblower model. It is important to check the manual for the specific requirements and instructions for oil maintenance.
You can download it here: http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0502196.pdf
try the MTD website, they are most likely the manufacturer of this equipment. Revision: Actually, these were made by Ariens. Go to Ariens.com. Click on Customer service then on Owner Manual Downloads. Click on "click here to find the correct manual for your equipment" (step 4). Enter the model no and S/N form your snowblower (or enter 938400 for model no and 111111111 for S/N) and select owner manual.
You can download manuals for some Craftsman equipment on Sears website. You will need the model number. Go to: http://www.searspartsdirect.com/partsdirect/index.action?sid=PSHx20080114x00001aand put in the model number. If there is a manual available you can download it there.
There doesn't seem to be a model like that at all. Double check your numbers. To look at the manual, go to Sears.com and just search Parts. That'll take you to the Part Direct page. Enter your correct model number there and it will give you the manual as well as an exploded view of your snowthrower.
The Jacobson snowblower model 420 and the Jacobson snowburst model are slightly different. They have different names because they are not exactly the same, but they are very similar.Ê
If you go to the MTD website, their is a customer service tab you should click. After that you could fill out the search criteria for your snowblower, or click on the summary section #5 "Can I download a manual and/or part list?" You will need both the model and serial number which should be easily found on you equipment. Hope this helps!!
Model 526, snowblower, Serial number 005754M