Viking MB 756 GS Manuel D'utilisation page 56

Fault:
Engine does not start
Possible cause:
– Throttle lever set to Stop position
– Choke is not actuated
– No fuel in tank
– Inferior, dirty or old fuel in tank
– Insufficient flow of fuel
– Spark plug dirty or damaged
– Incorrect electrode gap
– Spark plug socket detached from the
spark plug
– Engine is flooded due to several
starting attempts
– Dirty air filter
– Throttle cable is damaged (e.g. kinked)
Remedy:
– Set throttle lever to the Choke or Start
position ( 10.1)
– Set throttle lever to the Choke position
( 10.1)
– Refill fuel tank ( 7.5)
– Clean fuel system and carburettor;
always use fresh, good quality fuel @,
, ( 7.5)
– Check fuel line @,
– Clean or replace spark plug @
– Adjust electrode gap
– Connect spark plug socket; check
connection between ignition lead and
socket
– Remove spark plug and dry; set throttle
lever to STOP position and pull recoil
starter rope several times with spark
plug removed; screw in spark plug and
connect spark plug socket @
– Clean/replace air filter @
– Repair throttle cable
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Fault:
Starting problems or deteriorating engine
power
Possible cause:
– Mowing at an excessively low cutting
height or fast speed
– Water in fuel tank and carburettor;
carburettor blocked
– Fuel tank contaminated
– Air filter dirty
– Spark plug dirty
Remedy:
– Adapt cutting height and reduce
mowing speed
– Empty fuel tank, clean fuel line and
carburettor
– Clean fuel tank
– Clean/replace air filter @,
– Clean spark plug
Fault:
Engine cuts out during operation
Possible cause:
– Fuel cock closed
– Tank ventilation screw closed
– Blade brake clutch overloaded
Remedy:
– Open the fuel cock (
– Open the tank ventilation screw
( 10.1)
– Clean the mowing channel, empty the
grass catcher bag (
Fault:
No drive when self-propulsion lever is
actuated
Possible cause:
– Self-propulsion cable incorrectly
adjusted
– Self-propulsion cable damaged
(e.g. kinked)
– V-belt worn
Remedy:
– Check the adjustment (
– Replace the cable
– Replace the V-belt
Fault:
Engine overheating
Possible cause:
– Oil level in engine too low
– Cooling ribs dirty
Remedy:
– Perform an engine oil change if
necessary @
– Clean cooling ribs (
Fault:
Poor cut, lawn turning yellow
Possible cause:
– Mowing blade is blunt or worn,
– Rate of feed is too high in relation to the
cutting height
– Engine speed is too low
Remedy:
– Re-sharpen or replace mowing blade
( 11.6)
10.1)
– Reduce rate of feed and/or select
correct cutting height (
– Set the throttle lever to the Start
position (
9.)
Fault:
Mowing channel blocked
Possible cause:
– Mowing blade is worn
– Mowing grass which is too long or too
wet
11.9)
11.3)
9.), ( 7.3)
10.1)
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