Toro provides a manual for the Toro 521 snow blower on its website for download. Toro also has a customer care line customers can call to request a mailed printed copy.
To find the manual online, go to toro.com/en/parts, and enter the model number of the snow blower into the search box. Choose the correct year and serial number of the snow blower. The operator manual as well as the service manual are available for download on the next page.
To request a printed copy of the manual, call Toro's toll-free customer care line at 1-888-384-9939 in the United States. You must provide the model number and serial number of the snow blower.