MTD Series 521 - Manual (Page 13)

13
8
Troubleshooting
Guide
Problem
Engine fails to start
Engine runs erratic
Engine Overheats
Corrective Action
Refer to the Engine Manual packed with your unit.
Push primer bulb two or three times.
Fill tank with clean, fresh gasoline.
Drain gasoline and refill tank with clean, fresh gasoline.
Connect the spark plug wire to the spark plug.
Clean, adjust gap or replace spark plug.
Refer to the Engine Manual packed with your unit.
Connect and tighten spark plug wire.
Drain gasoline & refill tank with clean, fresh gasoline.
Clear vent of any debris.
Drain fuel tank. Refill with fresh fuel.
Refer to the Engine Manual packed with your unit.
Refer to the Engine Manual packed with your unit.
Fill crankcase with proper oil.
Clean the area around the engine’s cooling fins.
Replace the engine’s air filter.
Refer to the Engine Manual packed with your unit.
Possible Cause(s)
Dirty air cleaner
Engine needs to be primed
Fuel tank empty
Stale fuel in gasoline tank
Spark plug wire disconnected.
Spark plug fouled
Engine flooded
Spark plug wire loose
Stale fuel in gasoline tank
Vent in gas cap plugged
Water or dirt in fuel system
Dirty air cleaner
Carburetor out of adjustment
Engine oil level low
Air flow restricted
Dirty air filter
Carburetor not adjusted properly
Excessive Vibration Replace edger blade.
Contact an authorized MTD service dealer. Edger blade bent or damaged
Blade spindle bent or damaged
Drivebelt Slips Replace drive belt. Belt worn or stretched
Troubleshooting Guide
NOTE: Specifications are
subject to change without
notification or obligation.
Images my not reflect your
exact model and are for
reference purposes only.
For parts and/or
accessories please
call 1-330-220-4683,
or 1-800-800-7310
or visit
www.mtdproducts.
com