These machines are loud and can eject "kickback" chips. Always wear safety goggles and heavy-duty gloves.
The best place to find a digital copy is the MacKissic website under their "Product Manuals" section. mighty-mac-chipper-owners-manual
If your model is self-propelled or uses a belt drive, check the belt tension frequently. A loose belt is the #1 cause of lost power. These machines are loud and can eject "kickback" chips