Stihl RT 4097 S Instruction Manual page 52

– Mowing grass which is too long or too
wet.
Remedy:
– Empty fuel tank, clean fuel tank, fuel
line and carburettor. ( )
– Clean fuel tank. ( )
– Clean/replace air filter. (@)
– Clean spark plug. (@)
– Adapt cutting level and driving speed to
the mowing conditions.
Fault:
Engine overheating.
Possible cause:
– Dirty cooling ribs.
– Engine oil level too low.
– V-belt worn.
Remedy:
– Clean cooling ribs. (@)
– Check the engine oil level and top up
the engine oil if necessary. (
– Replace the V-belt. ( )
Fault:
Machine does not drive.
Possible cause:
– Gearbox disengaged.
– V-belt (gearbox) detached.
– V-belt (gearbox) worn or defective.
– Missing feather key between rear axle
and rear wheels.
Remedy:
– Engage the gearbox (freewheel lever).
( 8.14)
– Fit V-belt (gearbox). ( )
– Replace V-belt (gearbox). ( )
– Install feather key. ( 14.10)
50
Fault:
Excessive vibration during operation.
Possible cause:
– The mowing blades are imbalanced
due to incorrect sharpening or damage.
– The blade fastening screws are not
securely tightened.
– The engine mounting is not securely
tightened.
– V-belt is damaged.
Remedy:
– Re-sharpen the mowing blade and
balance or replace the mowing blade.
( 14.6)
– Tighten the blade fastening screws to
the specified torque. (
– Tighten the engine mounting. ( )
– Replace the V-belt. ( )
Fault:
14.12)
Poor cut, lawn turns yellow after mowing.
Possible cause:
– Mowing blade blunt or worn.
– The driving speed is too fast in relation
to the mowing conditions (cutting level,
lawn condition).
– Maximum engine speed not set (throttle
lever not in MAX position)
– Mowing deck adjustment not OK.
– Mowing deck discharge opening
blocked.
– The mowing deck is soiled with grass
residues (deposits on inside of mowing
deck housing).
Remedy:
– Sharpen or replace the mowing blade
(observe wear limits). (
– Reduce the driving speed and select a
higher cutting level.
– Set the throttle lever to the MAX
position. (
14.6)
14.6)
8.2)
– Check the mowing deck adjustment
and re-adjust the mowing deck if
necessary. ( 14.7)
– Remove grass residues from the
mowing deck discharge opening.
– Clean the inside of the mowing deck.
Fault:
Mowing deck discharge opening blocked.
Possible cause:
– Mowing blade wing worn or damaged.
– Mowing grass which is too long or too
wet.
– The driving speed is too high in relation
to the set cutting level.
– Maximum engine speed not set (throttle
lever not in MAX position)
– Wrong driving direction during mowing
operation.
Remedy:
– Replace the mowing blade. (
– Mow the lawn in two stages: 1. Mowing
at the highest cutting level,
2. Mowing at the desired cutting level.
– Reduce the driving speed and select a
higher cutting level.
– Set the throttle lever to the MAX
position. ( 8.2)( 8.3)
– Select correct driving direction during
mowing operation.
Fault:
Machine does not eject clippings evenly.
Possible cause:
– Grass is too damp and therefore too
heavy.
– The driving speed is too fast in relation
to the mowing conditions (cutting level,
lawn condition).
– Grass is too high.
– Cutting level set too low.
– Mowing blades are blunt or worn.
0478 192 9810 A - EN
14.6)