Inspecting Cutter Disk - Jacobsen 32251 Technical Manual

9 MAINTENANCE
9.7

INSPECTING CUTTER DISK _________________________________________________

A bent or unbalanced cutter disc can cause excessive vibration. Always mow with a flat and balanced cutter disc and
non worn blades. Make sure that the cutter disc insert nuts, blade bolts and blades are properly securely fastened to
the disc.
1. Stop the engine and wait for all moving parts to stop. Turn the fuel shut-off valve to the closed position and
disconnect the wire from the spark plug.
2. Rotate and tip the lawn mower onto its left edge with the carburetor and air cleaner facing up and away from the
ground.
3. Remove the blade attachment bolts and the blades.
4. Remove the engine shaft bolt and washer.
5. Remove blade disc from the mower and place on a flat level surface with the blade side facing down.
6. Inspect for a consistent gap at each of the three blade disc ends where blades are attached.
7. If an inconsistent gap is seen between the flat surface and the surface of the blade disc, or if the disc is warped or
damaged in any way, replace the blade disc.
Never operate the mower with a bent or damaged blade disc. A bent or damaged disc will cause excessive vibration
and unsafe operating conditions including loose components or thrown objects. Loose components can be thrown
causing serious injury or death.
8. Inspect the disc insert nuts to ensure they are properly secure and tight. If the insert nuts are loose or damaged,
the blade disk must be replaced. Do not attempt to tighten the insert nuts if they are loose.
9. Inspect the blade attachment bolts for excessive wear and to ensure they are properly tightened. Make sure the
correct blade bolts are used. Using incorrect blade bolts can result in injury or death. The blade bolts used with
the metal blades are black in color. The blade bolts used with the plastic blades are silver in color. Never use
incorrect blade bolts.
10. Tighten, blade bolts to 7 ft. lb. (9.5 Nm). Replace worn or damaged bolts. Loose or damaged bolts can cause
blades or blade bolts to be thrown into the operator mowing area causing serious injury or death.
11. Inspect the blades for wear or damage. Replace worn and damaged blades immediately. Worn or damaged
blades can cause objects be thrown into operator mowing area causing serious injury or death.
Always replace all three blades at the same time. Never replace only one or two blades. When you replace less than
all three blades at the same time can cause your mower to become unbalanced and can cause excessive vibration.
Excessive vibration can create unsafe operating conditions resulting in loose or thrown objects which can result in
serious injury or death.
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WARNING