Storing Your Lawn Mower; Troubleshooting - Cub Cadet SC 621 Operator's Manual

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Pivot the baffle back to its original position and
secure with three hex screws earlier removed.
Lightly lubricate the inside of the blade adapter and
reinstall the spacer, wave washer, blade adapter
assembly, and blade in the correct order.
SECTION 8: STORING YOUR LAWN MOWER
The following steps should be taken to prepare your
lawn mower for storage.
Clean and lubricate mower thoroughly as described
in the lubrication instructions.
We do not recommend the use of a
IMPORTANT:
pressure washer or garden hose to clean your unit.
Refer to engine manual for correct engine storage
instructions.
SECTION 9: TROUBLESHOOTING
Problem
Engine fails to start
Engine runs erratic
Engine overheats
Idles poorly
Excessive vibration
Mower will not mulch grass 1. Engine speed too low.
Uneven cut
NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service dealer.
Cause
1. Blade control handle disengaged.
2. Spark plug wire disconnected.
3. Fuel tank empty or stale fuel.
4. Blocked fuel line.
5. Faulty spark plug.
1. Spark plug wire loose.
2. Blocked fuel line or stale fuel.
3. Vent in gas plugged.
4. Dirty air cleaner.
5. Carburetor out of adjustment.
1. Engine oil level low.
2. Air flow restricted.
3. Carburetor not adjusted properly.
1. Spark plug fouled, faulty or gap too
wide.
2. Carburetor improperly adjusted.
3. Dirty air cleaner.
1. Cutting blade loose or unbalanced.
2. Bent cutting blade.
2. Wet grass.
3. Excessively high grass.
4. Dull blade.
1. Wheels not positioned correctly.
2. Dull blade.
Tighten the hex bolt to secure the blade to torque:
450-600 in. lbs.
Coat mower's cutting blade with chassis grease to
prevent rusting.
Store mower in a dry, clean area. Do not store next
to corrosive materials, such as fertilizer.
NOTE: When storing any type of power equipment in a
poorly ventilated or metal storage shed, care should be
taken to rust-proof the equipment. Using a light oil or
silicone, coat the equipment, especially cables and all
moving parts.
1. Engage blade control handle.
2. Connect wire to spark plug.
3. Fill tank with clean, fresh gasoline.
4. Clean fuel line.
5. Clean, adjust gap, or replace.
1. Connect and tighten spark plug wire.
2. Clean fuel line; fill tank with clean, fresh
gasoline
3. Clear vent.
4. Clean air cleaner.
5. Adjust carburetor.
1. Fill crankcase with proper oil.
2. Remove blower housing and clean.
3. Adjust carburetor.
1. Reset gap to .030" or replace spark
plug.
2. Adjust carburetor.
3. Clean air cleaner.
1. Tighten blade and adapter. Balance
blade.
2. Replace blade.
1. Set throttle at full throttle.
2. Do not mow when grass is wet; wait
until later to cut.
3. Mow once at a high cutting height, then
mow again at desired height or make a
narrower cutting path.
4. Sharpen or replace blade.
1. Place all four wheels in same height
position.
2. Sharpen or replace blade.
17
Remedy

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