Change Engine Oil - Gravely 911530 - Pro 21 SCH Owner's/Operator's Manual

Sharpen the Mower Blades
CAUTION: DO NOT sharpen
mower blades while on unit. An
unbalanced mower blade will
cause excessive vibration and
eventual damage to unit. Check
mower blade balance before
reinstalling blades.
NEVER weld or straighten bent
blades.
1. Remove mower blade from unit.
Discard mower blade if:
• More than 1/2 in. (1.27 cm) of metal is
removed.
• Air lifts become eroded.
• Blade is bent or broken.
2. Sharpen mower blade by removing an
equal amount of material from each end
of mower blade. DO NOT change angle
of cutting edge or round the corner of the
mower blade.
DO NOT Sharpen to This Pattern
1
3
DISCARD if More Than
1/2 in. (1.27 cm)
4
Sharpen to This Pattern
1. Square Corner
2. Cutting Edge
3. Air Lift
4. Air Lift Erosion
2
2
3
Figure 6
3. Check mower blade balance.
Slide mower blade on an unthreaded
bolt. A balanced blade should remain in a
horizontal position. If either end of mower
blade moves downward, sharpen the
heavy end until blade is balanced
(Figure 7).
4. Install mower blade on unit.
5. Tighten the bolts to a torque of 37.5 -
50 lbf-ft (51-68 N•m).
Bolt
CHECK DRIVE BELT
Check drive belt and replace if worn or
damaged. See Drive Belt Replacement on
page 17.
CHECK FASTENERS
Check all fasteners for proper tightness. Pay
special attention to blade hardware and all
guards, shields and safety devices.
CHECK AIR CLEANER
See engine manual for specific information.

CHANGE ENGINE OIL

IMPORTANT: Change engine crankcase oil
after first five (5) hours of operation. Then
change oil after every 25 hours of operation.
Refer to engine manual for instructions and
proper oil type.
IMPORTANT: Proper oil level must be
maintained at all times or engine damage will
result. DO NOT overfill. Be sure engine is level
when adding oil.
GENERAL LUBRICATION
NOTE: The LM21SC has lube fittings on drive
mount for use in commercial applications.
Lubricate as needed.
OT0792
GB - 15
Blade
Figure 7
OA0013