Jacobsen Bob-cat 933011, Setup, Parts & Maintenance Manual, Page: 13 / 44

11
Midsize
Classic
MAINTENANCE
BLADE SHARPENING
Blades may be sharpened by filing or grinding, but with either method the balance of the blades must be
maintained at 5/8 oz/in or less. Failure to maintain balance causes excess vibration, wear and shortened life
of not only the blades, but most all components of the machine. To balance a blade after sharpening: attach
1/8 oz of weight 5" from center on the light end. This should make the light end the heavy end. If it does not:
file or grind the heavy end until the addition of weight makes the light end the heavy end.
Cutterdeck Pulley Assembly
NOTE:
•
Do not overheat or weaken the blades.
• Do not straighten bent blades. Replace with new
Bob-Cat blades.
If lift portion of blade is worn thin replace with a
new Bob-Cat blade.
• ALWAYS replace with Bob-Cat blades—do not
use another manufacturer’s blades as this could
be dangerous.
• Replace cracked or bent blades.
BLADE REMOVAL
1.
Use a box wrench or socket with a long breaker
bar to remove spindle bolt under cutterdeck.
2. Slip tube over breaker bar or wrench if
necessary to gain leverage.
3. Keep hands clear as blades may rotate when
bolt releases.
4. When changing blades, wear thickly padded
gloves.
5. Block blades from turning by using a piece of
wood.
6. Follow these instructions to prevent injury when
bolt releases.
NOTE: To prevent blade from turning, place block
of wood at location A, with grain perpendicular to
blade.
BLADE RE-INSTALLATION
1.
Place the desired number of spacers (no more
than 2) on the spindle bolt below the cutterdeck
between the blade and spindle shaft.
2. Insert the cutter spindle bolt (from bottom)
complete with washer, blade and spacers.
3. Place remaining spacer(s) on the spindle bolt
above the cutterdeck between the conical
washer and nut (as shown). Replace nut and
tighten to 70 ft-lbs.