If there isn't anything in your owners manual(or you don't have one) go to the manual lookup webpage on Ariens Parts Radar site(see link below). You may also be able to locate a service manual using your Model#/Serial#. If that doesn't help, go to the Home page and click on Support. You can live chat with a CSR and they are very good at assisting with anything related to an Ariens or Gravely machine.