Troubleshooting - MTD 644E Operator's Manual

• Run engine until fuel tank is empty and engine
stops due to lack of fuel.
• Drain carburetor by pressing upward on bowl drain,
located below the carburetor cover.
NOTE:
Fuel stabilizer, or "Sta-Bil" (Included with
certain units), is an acceptable alternative in minimizing
the formation of fuel gum deposits during storage. Do
not drain carburetor if using fuel stabilizer.
• Wipe equipment with an oiled rag to prevent rust.
SECTION 9: TROUBLE SHOOTING GUIDE
Trouble Possible Cause(s)
Engine fails to start Fuel tank empty, or stale fuel.
Blocked fuel line.
Choke not in ON position
Faulty spark plug.
Key not in switch on engine.
Spark plug wire disconnected.
Primer button not depressed.
Fuel shut-off valve closed
(if so equipped).
Engine runs erratic Unit running on CHOKE.
Blocked fuel line or stale fuel.
Water or dirt in fuel system.
Carburetor out of adjustment.
Loss of power Spark plug wire loose.
Gas cap vent hole plugged.
Exhaust port plugged.
Engine overheats Carburetor not adjusted
properly.
Incorrect fuel mixture.
Excessive vibration Loose parts or damaged auger.
Unit fails to propel itself Incorrect adjustment of drive
cable.
Drive belt loose or damaged.
Unit fails to Discharge chute clogged.
discharge snow
Foreign object lodged in auger.
Incorrect adjustment of drive
cable.
Drive belt loose or damaged.
NOTE:
For repairs beyond the minor adjustments above, contact your local authorized service dealer.
• Remove spark plug and pour one ounce of engine
oil through spark plug hole into cylinder. Cover
spark plug hole with rag. Crank engine several
times to distribute oil. Replace spark plug.
• Follow the lubrication recommendations found in
the Maintenance Section.
• Always store the snow thrower in a clean, dry area.
When storing any type of power equipment in an
unventilated or metal storage shed, care should be
taken to rust proof the equipment. Using a light oil or
silicone, coat the equipment, especially any chains,
springs, bearings and cables.
Corrective Action
Fill tank with clean, fresh gasoline. Fuel will not last over thirty days
unless a fuel stabilizer is used.
Clean fuel line.
Move switch to ON position
Clean, adjust gap or replace.
Insert key.
Connect spark plug wire.
Refer to the engine manual.
Open fuel shut-off valve.
Move choke lever to OFF position.
Clean fuel line; fill tank with clean fresh gasoline. Fuel will not last
over thirty days unless a fuel stabilizer is used.
Drain fuel tank. Refill with fresh fuel.
Refer to the engine manual.
Connect and tighten spark plug wire.
Remove ice and snow from cap. Be certain vent hole is clear.
Clean following the engine manual.
Refer to the engine manual packed with your unit or have
carburetor adjusted by an authorized service dealer.
Drain fuel tank. Refill with proper fuel mixture.
Stop engine immediately and disconnect spark plug wire. Tighten
all bolts and nuts. Make all necessary repairs. If vibration
continues, have unit serviced by an authorized service dealer.
Adjust drive cable.
Replace drive belt.
Stop engine immediately and disconnect spark plug wire. Clean
discharge chute and inside of auger housing.
Stop engine immediately and disconnect spark plug wire. Remove
object from auger.
Adjust drive cable.
Replace drive belt.
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