Troy-Bilt 494 - Manual (Page 11)

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make sure to remove an equal amount from each
blade and torque to 250 - 300 in. lbs.
NOTE: Make certain blades are reassembled with the
sharp edge facing upward.
Shredder Blade
• Disconnect the spark plug wire and ground against
the engine.
• Lower the hopper assembly and block up the
housing.
• Remove the six hex lock nuts and flat washers from
the weld studs on the flail housing.
• Separate the hopper assembly from the impeller
assembly and remove the support plate.
NOTE: When reassembling the support plate, the
embossed tab must face inward towards the impeller.
• Remove the two wing knobs and cupped washers
that secure the discharge chute and raise the
chute.
• Insert a 1/2” or 3/4” diameter pipe through the flail
screen into the impeller to keep it from turning or
remove the flail screen and insert a piece of wood
into the chute opening.
• Remove the two outside screws on the blade, using
a 3/16” allen wrench and a 1/2” wrench.
See Figure 10.
• Remove the blade by removing the center bolt, lock
washer, and flat washer.
NOTE: Use caution when removing the blade to avoid
contacting the weld studs on the housing.
• When sharpening the blade, follow the original
angle of grind as a guide. It is extremely important
that each cutting edge receives an equal amount of
grinding to prevent an unbalanced blade.
Figure 10
• An unbalanced blade will cause excessive vibration
when rotating at high speeds and may cause
damage to the unit. The blade can be tested by
balancing it on a screwdriver or nail. Remove metal
from the heavy side until it is balanced evenly.
• When reassembling the blade, tighten center bolt to
between 550 and 700 in.-lbs. and the two out bolts
to between 250 and 350 in.-lbs.
Storing Your Chipper Shredder
• Clean the equipment thoroughly.
• Wipe equipment with an oiled rag to prevent rust.
• Refer to engine manual for correct engine storage
instructions
• Store unit in a clean, dry area. Do not store next to
corrosive materials such as fertilizer.
Discharge Chute
Blade
Flat Screw
Hex Bolt
Weld Stud