Echo 74065S - Manual (Page 12)

10
a) Broken or damaged belts.
b) Broken spindle.
c) Failed bearings.
a) Cutting string too weak.
b) Growth is too thick or heavy.
c) Engine not running at full RPM.
a) Cutting string too weak.
b) Drive belts are loose or worn.
c) Growth is too thick or heavy.
d) Belts too tight.
a) Drive belts are loose or worn.
b) Worn or damage pulley.
a) Gas tank is empty.
b) Spark plug wire is disconnected.
c) Spark plug is defective.
d) Gas line is obstructed.
(bail disconnected)
e) Dirty, stale, water-contaminated gas.
f) Flooded engine.
g) Dirty or plugged air cleaner or engine
cooling fins.
h) Engine brake control broken.
a) Pulley not aligned.
b) Belt not tensioned properly.
c) Spindle bearing failed.
a) Loose chain.
b) Worn chain.
c) Worn sprocket.
d) Sprocket not aligned.
a) Replace belts.
b) Repair spindle.
c) Repair bearings.
a) Replace with heavier cutting string
(155 mil).
b) Reduce trimming area to 1/2 size or
raise the trimmer head off the ground
slightly to trim top portion of growth.
Follow with trimmer head on the ground
again.
c) Speed up engine to full throttle.
a) Replace with heavier cutting string
(155 mil).
b) Replace drive belts.
c) Reduce size of trimming area in half.
Raise the trimmer head off the ground
slightly to trim top portion of growth.
Follow with trimmer head on the ground
again.
d) Move spindle hub assembly towards
rear of trimmer.
a) Replace drive belts.
b) Replace pulley.
a) Fill gas tank.
b) Connect loose wire to spark plug.
c) Replace spark plug.
d) Remove gas line at carburetor and
check for obstruction. Drain gas tank
and refill with fresh, clean gasoline.
e) Drain tank and fill with fresh, clean
unleaded gasoline.
f) Put throttle control in run position and
crank engine several times to clear out
excess gas.
g) Clean air cleaner and replace. Clean
cooling fins and shroud area of engine.
h) Replace engine brake control.
a) Align pulleys.
b) Tension belt with 70 lbs. of force.
c) Replace bearing.
a) Tighten chain.
b) Replace chain.
c) Replace sprocket
d) Align drive sprocket and wheel clutch
assembly with washers.
1. Cutting strings do not turn.
2. Cutting is slow or rough.
3. Trimmer requires excessive power
or stalls.
4. Drive belts squealing or smoking.
5. Engine won't start or is hard to
start.
6. Drive belt rolling or falling off
pulleys.
7. Chain falling off Self Propelled
model
Problem Probable Cause
Suggested Remedies
Troubleshooting