Bad Boy MZ Magnum 54, Owner'S, Service & Parts Manual, Page: 31 / 52

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Blade Removal:
To change blades, it may be easier to use a piece of wood to
keep the blade from turning so that the bolt can be loosened.
Use a 15/16" socket and impact drill, or a wrench and an
extension to gain more leverage. You might need to put a 3/4"
wrench on top of the pulley bolt to keep the blade from
spinning. Bolts used have right-handed threads.
Re-torque the blade bolts to 90-110 lbs.
The blade spindles contain a sealed ball earing inside the top
and bottom of the spindle. The bearings are replaceable for a
more cost effective repair.