Stihl RT 4082 Instruction Manual page 117

– 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)
0478 193 9905 C - EN
Fault:
Excessive vibration during operation.
Possible cause:
– Mowing blade imbalance due to
incorrect sharpening or damage.
– Blade fastening screw not fastened
tightly.
– Engine mounting not securely
tightened.
– V-belt damaged.
– Discharge chute blocked.
Remedy:
– Re-sharpen mowing blade and balance
or replace mowing blade. (
– Tighten blade fastening screw to the
specified torque. (
– Tighten engine mounting. ( )
– Replace V-belt. ( )
– Clean discharge chute. ( )
14.13)
Fault:
Poor cut, lawn turns yellow after mowing.
Possible cause:
– Mowing blade blunt or worn.
– Driving speed too fast in relation to
mowing conditions (cutting height, lawn
condition).
– Maximum engine speed not set (throttle
lever not in MAX position).
– Mowing deck adjustment not OK.
– Discharge chute blocked.
– Mowing deck soiled with grass residues
(deposits on inside of mowing deck
housing).
Remedy:
– Sharpen or replace mowing blade
(observe wear limits). (
– Reduce driving speed and select a
higher cutting height.
– Set throttle lever to the MAX position.
( 8.2)
– Check mowing deck adjustment and re-
adjust mowing deck if necessary.
(
– Remove grass catcher box and free
discharge chute from grass residues.
– Clean inside of mowing deck.
Fault:
Discharge chute blocked.
Possible cause:
– Mowing blade wing worn or damaged.
– Mowing grass which is too long or too
wet.
– Driving speed too high in relation to set
14.7) cutting height.
– Maximum engine speed not set (throttle
14.7) lever not in MAX position).
– Level sensor adjusted incorrectly.
Remedy:
– Replace mowing blade. (
– Mow lawn in two stages: 1. Mowing at
highest cutting level.
2. Mowing at desired cutting height.
– Reduce driving speed and select a
higher cutting height.
– Set throttle lever to the MAX position.
(
– Adjust level sensor (pull slide out fully).
(
Fault:
Grass catcher box not being completely
filled.
Possible cause:
– Level sensor incorrectly adjusted.
– Cutting height set too low.
– Grass is excessively damp and
14.7) consequently too heavy to be
transported through the discharge
chute in the grass catcher box.
– Mowing blade is blunt or worn.
– Grass is too high.
14.8)
14.7)
8.2)
8.15)
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