Troubleshooting - MTD Series 600 Operator's Manual

Troubleshooting
Problem
Engine fails to start
Engine runs erratic
Cause
1. PTO!Blade Engage knob engaged.
2. Parking brake notengaged.
3. Spark plug wire disconnected.
4. Throttle control lever not in correct starting
position.
S. Choke notactivated
6. Fuel tankempty, or stale fuel.
Remedy
1. Place knob in disengaged (OFF) position.
2. Engage parking brake.
3. Connect wire to spark plug.
4. Place throttle lever to FAST position.
5. Put throttle lever up into the CHOKE position.
6. Fill tankwith clean, fresh (less than 30 days
old) gas.
7. Blocked fuel line.
8. Faulty spark plug.
7. Clean fuel line and replace fuel filter.
8. Clean, adjust gap or replace plug.
Engine overheats
Engine hesitates at high
RPM
Engine Idles rough
Excessive vibration
Mower will not mulch grass
Uneven cut
9.
1.
2.
3.
4,
5.
6,
1.
2.
1,
2.
1.
2.
1.
Engine flooded. 9.
Unit running with CHOKE activated. 1.
Spark plug wires loose. 2.
Blocked fuel line or stale fuel.
Vent in gas cap plugged.
3,
4,
Water or dirt in fuel system. 5.
Dirty air cleaner. 6.
Engine oil level low. 1.
Air flow restricted. 2.
Spark plug gap too close. 1.
Spark plug fouled, faulty or gap too wide. 1.
Dirty air cleaner. 2.
Cutting blade loose or unbalanced. 1.
Damaged or bent cutting blade. 2.
Engine speed too low. 1.
2. Wet grass. 2.
Excessively high grass. 3.
4. Dull blade.
1. Deck not leveled properly.
2. Dull blade.
3. Uneven tire pressure.
4.
1.
2.
3.
Crank engine with throttle in FAST position.
Deactivate the CHOKE.
Connect and tighten spark plug wires.
Clean fuel line; fill tank with clean, fresh
gasoline and replace fuel filter.
Clear vent or replace cap if damaged.
Drain fuel tank. Refill with clean, fresh
gasoline.
Replace air cleaner paper element.
Fill crankcase with proper amount and
weight of oil.
Clean grass clippings and debris from around
the engine's cooling fins and blower housing.
Remove spark plug and reset the gap.
Replace spark plug. Set plug gap.
Replace air cleaner element.
Tighten blade and spindle.
Replace blade.
Place throttle in FAST (rabbit) position.
Do not mulch when grass is wet.
Mow once at a high cutting height, then
mow again at desired height or make a
narrower cutting swath.
Sharpen or replace blade.
Perform side-to-side deck adjustment.
Sharpen or replace blade.
Check tire pressure in all four tires.
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