Craftsman 917.77341 - Manual (Page 15)

TROUBLESHOOTING CHART
PROBLEM CAUSE CORRECTION
Does not start 1. Dirty air filter.
2. Out of fuel.
3. Stale fuel.
4. Water in fuel.
5. Sparkplug wire is
disconnected.
6. Bad spark plug.
7. Throttle control lever not
in correct position
(if equipped).
1. Clean/replace air filter.
2. Fill fuel tank.
3. Drain tank and refill with
fresh clean fuel.
4. Dram fuel tank and
carburetor and refill tank
with fresh gasoline.
5. Connect wire to plug.
6. Replace spark plug.
7. Move throttle lever to FAST
position.
Loss of power 1. Dirty air filter.
2. Buildup of grass, leaves,
and trash under trimmer.
3 Too much oil in engine.
4. Walking speed too fast.
1. Clean/replace air filter.
2. Clean underside of trimmer
and trimmer head.
3. Check oil level.
4. Trim at slower walking
speed.
Excessive
Vibration
1. Lines uneven or broken.
2. Loose nuts or bolts.
3. Damaged trimmer head.
1. Check trimmer lines.
2. Check all hardware,
including engine bolts.
3. Check/repair trimmer head.
Starter rope hard
to pull
1. Bent engine crankshaft. 1. Contact a Sears or other
qualified service center.
Loss of head
drive 1. Belt not driving. 1. Put belt on pulleys or
replace belt if broken.
Poor trimming
performance 1. Trimmer line length is
too short.
2. Throttle control lever not
in correct position
(if equipped).
1. If line is worn or broken to
half original length,
replace line.
2. Move throttle lever to FAST
position.
Trimmer head
does not
retain line
1. Trimmer line not
properly installed.
2. Broken line retainer clip.
3. Incorrect size of
trimmer line.
1. Follow instructions in
Maintenance section.
2. Replace string carrier plate
assembly.
3. Use .130 diameter
trimmer line.
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