GGP Mountfield SV-150, Workshop Manual, Page: 12 / 35

Environmental problems
The engine is used at a high
altitude
Carburation problems
Air seeps into the carburettor
The governor malfunctions or
there is a problem with the
rods
Starting problems
The coil air gap has been
poorly adjusted
Carburation problems
Governor blocked
Lawnmower problems
The engine brake cable is bent
or jammed
The rarefaction of air in the mountains causes a
drop in power of approx. 10-12% every 1000
metres of altitude.
If air seeps through the gaskets, it can cause the
lawnmower to function poorly and make it diffi-
cult to maintain the minimum speed (2200-2500
rpm).
The pneumatic governor fin disc is broken or
does not move freely and therefore fails to work
the carburettor correctly.
The governor rods are bent, deformed or do not
move freely, preventing the governor from reach-
ing its end-of-stroke.
The air gap adjustment between the flywheel
and coil must be 0.25-0.40 mm.
Excess dirt or a broken spring can impede the
movements of the governor or impede return.
When the lever is released, the earth
microswitch is not pressed.
Advise your client to
adapt the strain of the
lawnmower to the lim-
ited power available.
Replace the carburet-
tor gaskets
[ 6.4.A]
Check the entire gov-
ernor system
[ 6.5]
Adjust the air gap [
6.6.B] and if the prob-
lem persists, replace
the coil
[ 6.6.C]
Check the governor
[ 6.5.B]
Check and/or adjust
the cable
[ 6.7.A]
01/2005
SV 150
5.1 .
0
TROUBLESHOOTING
4 / 5
WORKSHOP MANUAL
page
from
2004
to
••••
F) The engine runs irregularly
Probable cause Comment Solution
G) The engine overreved
Probable cause Comment Solution
H) The engine does not turn off
Probable cause Comment Solution
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