Troy-Bilt 721 Snow Blower User Manual


 
11
SECTION 8: TROUBLESHOOTING GUIDE
NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service
representative or call 1-866-840-6483 for the Customer Support Center. Refer to the engine manual for more
engine related information.
Problem Cause Remedy
Engine fails to start 1. Fuel tank empty, or stale fuel
2. Blocked fuel line
3. Key not in ON position
4. Spark plug wire disconnected
5. Faulty spark plug
6. Engine not primed
7. Engine flooded with excessive priming
1. Fill tank with clean fresh gasoline.
2. Clean fuel line
3. Insert key and turn to ON position
4. Connect wire to spark plug.
5. Clean spark plug, readjust gap, or
replace.
6. Prime engine four times.
7. Wait at least ten minutes before
starting.
Engine runs erratic 1. Unit running on choke
2. Fuel line blocked, or stale fuel
3. Water or dirt in fuel system
4. Carburetor out of adjustment
1. Move choke lever to OFF position.
2. Clean fuel line and fill tank with fresh,
clean gasoline.
3. Refer to engine manual for remedy.
4. Refer to engine manual for remedy.
Engine overheats 1. Carburetor out of adjustment 1. Refer to engine manual for instruction.
Loss of power 1. Spark plug wire loose
2. Vent in gas cap plugged
1. Connect and tighten spark plug wire.
2. Clear vent.
Excessive vibration 1. Loose parts or damaged auger 1. Stop engine immediately and
disconnect spark plug wire. Check for
possible damage. Tighten all bolts
and nuts. Repair as needed. If the
problem persists, take unit to an
authorized service dealer.
Unit fails to self-
propel
1. Drive cable out of adjustment
2. Drive belt loose or damaged
1. Adjust drive cable following
instructions on page 9 of this manual.
2. Replace drive cable.
Unit fails to
discharge snow
1. Discharge chute clogged
2. Foreign object lodged in auger
3. Drive cable not adjusted properly
4. Drive belt loose or damaged
1. Stop engine immediately and
disconnect spark plug wire. Clean
discharge chute and the auger
housing.
2. Stop engine immediately and
disconnect spark plug wire. Remove
object .
3. Adjust drive cable following
instructions on page 9 of this manual.
4. Replace drive belt.