Shooting Guide - MTD Yard-Man 993 Series Operator's Manual

SECTION 11: 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
Unit running on CHOKE.
Blocked fuel line or stale fuel.
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 packed with your unit.
Open fuel shut-off valve.
Engine runs erratic 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.
Water or dirt in fuel system. Drain fuel tank. Refill with fresh fuel.
Carburetor out of adjustment. Refer to the engine manual packed with your unit or have
carburetor adjusted by an authorized service dealer.
Loss of power Spark plug wire loose. Connect and tighten spark plug wire.
Gas cap vent hole plugged. Remove ice and snow from cap. Be certain vent hole is clear.
Exhaust port plugged. Clean-see Maintenance section of engine manual.
Engine overheats Carburetor not adjusted Refer to the engine manual packed with your unit or have
properly, carburetor adjusted by an authorized service dealer.
Excessive vibration Loose parts or damaged Stop engine immediately and disconnect spark plug wire. Tighten
auger, all bolts and nuts. Make all necessary repairs. If vibration
continues, have unit serviced by an authorized service dealer.
Unit fails to propel incorrect adjustment of drive Adjust drive cable. Refer to Adjustment section of this manual.
itself cable. Replace drive belt. Refer to Belt Replacement in Maintenance
Drive belt loose or damaged, section of this manual.
Unit fails to Discharge chute clogged. Stop engine immediately and disconnect spark plug wire. Clean
discharge snow discharge chute and inside of auger housing.
Foreign object lodged in Stop engine immediately and disconnect spark plug wire.
auger. Remove object from auger.
incorrect adjustment of drive Adjust drive cable. Refer to Adjustment section of this manual.
cable. Replace drive belt. Refer to Belt Replacement in Maintenance
Drive belt loose or damaged, section of this manual.
Note:
For repairs beyond the minor adjustments above, contact your local authorized service dealer.
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