English
Operating Manual – Snowthrower
25
Troubleshooting
Risk of injury from starting the
machine by mistake
Before doing any work on this
machine
– Turn off the engine.
– Remove the ignition key and the
spark-plug connector.
– Wait until the engine has cooled
down.
Caution
Faults encountered when operating
the machine sometimes have simple
causes which you can remedy
yourself. If you are in any doubt, or if
expressly instructed to do so, seek
the help of a specialist workshop.
Have repair work carried out only by
a specialist workshop which will use
original replacement parts.
!
Fault
Possible cause
Action to take
Engine does not start.
Fuel tank empty.
Fill fuel tank.
Fuel has gone stale.
Drain out stale fuel into a suitable container in
the open air
1
). Fill up tank with clean, fresh
fuel.
Engine is cold.
Choke lever is not set to “
”/“ON”.
Set choke lever to “
”/“ON”.
Throttle lever is not set to “
”
(STH 5.56, STH 8.66, STH 10.66 C)
.
Set throttle lever to “
”.
Spark-plug connector not connected.
Put spark-plug connector on the spark plug.
Air filter dirty.
Clean air filter
1
).
Spark plug dirty or defective.
Clean spark plug
1
).
Have defective spark plug replaced
2
).
Carburettor flooded.
Set choke lever to “OFF” and start engine.
Engine runs unevenly
(stutters).
Choke lever set to “
”/“ON”.
Set choke lever to “OFF”.
Spark-plug connector loosely connected.
Connect spark-plug connector firmly.
Stale fuel.
Water or dirt in the fuel system.
Drain off stale fuel into a suitable container in
the open air
1
).
Fill up tank with clean, fresh fuel.
Vent hole in fuel filler cap blocked.
Clean fuel filler cap and vent hole.
Air filter dirty.
Clean air filter
1
).
Carburettor altered.
Have carburettor reset
2
).
Machine does not clear snow.
Shear bolts broken off.
Put in new shear bolts (see “Replacing a shear
bolt”).
Worm or throw-out chute blocked.
Stop engine, disconnect spark-plug connector.
Eliminate blockage.
Coupling cable for worm drive not correctly
adjusted.
Adjust coupling cable (see “Adjust coupling
for the worm drive”).
V-belt slack or torn
(STH 953)
.
Tighten slack V-belt (see “Tightening the V-
belt”). Have torn V-belt replaced
2
).
V-belt slack or torn
(STH 5.56, STH 8.66,
STH 10.66 C)
.
Have slack V-belt tightened
2
).
Have torn V-belt replaced
2
).
Summary of Contents for STH 953
Page 2: ...STH 5 56 1 335 101 STH 8 66 1 335 201 STH 10 66 C 1 335 302 STH 953 1 332 101...
Page 4: ......
Page 5: ......
Page 128: ...130 STH 953 STH 5 56 STH 8 66 STH 10 66 C 16 o 1 2 1 2 2 1 STH 953...
Page 133: ...135 10 25 50 1 3 9 3 4 1 2 1 2 2 1 2 3 5 4 25...
Page 136: ...138 2 3 4 1 y...
Page 137: ...139 1 Choke ON Choke ON STH 5 56 STH 8 66 STH 10 66 C 1 1 2 Choke OFF Choke ON Choke OFF 1 1 2...
Page 160: ...STH 953 162 1 2 1 2 3 A B 2x 1x 1x C 1x D...
Page 161: ...STH 953 163 1 2 D A B 2x 1x 1x 1x C D A B B C...
Page 162: ...STH 5 56 164...
Page 163: ...STH 5 56 165...
Page 164: ...STH 5 56 166...
Page 165: ...STH 5 56 167 A A B B C C D D D E F 2x 6x 6x 4x 2x 2x...
Page 169: ...STH 8 66 STH 10 66 C 171 1 2...
Page 170: ...STH 8 66 STH 10 66 C 172 A A B B C C D D D E F 2x 6x 6x 4x 2x 2x...
