User Manual

0478 216 9906 B - EN
70
Fault:
Engine not starting
Possible cause:
– On / Off switch not operated
– Feed chute not properly closed - safety
cut-off switch actuated (safety interlock)
– Blocked blade disc
– No fuel in tank; blocked fuel line
– GH 460 C: Tank ventilation screw
closed
– Inferior, dirty or old fuel in tank
– Spark plug socket detached from spark
plug; ignition lead not properly fastened
to socket
– Dirty air filter
– Dirty or damaged spark plug; incorrect
electrode gap
Remedy:
– Operate On / Off switch (Ö 8.1)
– Close feed chute properly and fasten
(tighten On / Off switch) (Ö 7.5)
– Remove shredder deposits from
housing (IMPORTANT: Detach spark
plug socket)
– Top up fuel; clean fuel line (Ö 7.8)
– Start machine in accordance with
instructions (GH 460 C: open tank
ventilation screw) (Ö 11.1)
– Always use fresh, good quality fuel,
normal unleaded petrol; clean
carburettor (Ö 7.8)
– Connect spark plug socket; check
connection between ignition lead and
socket  #
– Clean air filter  #
– Clean or replace spark plug; adjust
electrode gap  #
Fault:
Engine overheating
Possible cause:
– Dirty cooling ribs
– Oil level in engine too low
– Surface of engine covered with
shredded material
Remedy:
– Clean cooling ribs (Ö 12.1)
– Top up engine oil (Ö 7.8)
– Remove shredded material from the
engine
Fault:
Excessive vibration during operation
Possible cause:
– Faulty blade disc or blades
– Loose engine mounting
Remedy:
– Check blade discs, blades, blade shaft,
screws, nuts, washers and bearings of
cutting unit, repair if necessary #
– Tighten engine mounting bolts #
Fault:
Starting problems or deteriorating engine
power
Possible cause:
– Shredding material in housing
– Water in fuel tank and carburettor;
carburettor blocked
– GH 460 C: Tank ventilation screw
closed or not fully open
– Contaminated fuel tank
– Dirty air filter
– Dirty spark plug
Remedy:
– Remove shredder deposits from
housing (detach spark plug socket)
(Ö 12.1)
– Empty fuel tank, # clean fuel line and
carburettor
– GH 460 C: Start machine in
accordance with instructions (open tank
ventilation screw) (Ö 11.1)
– Clean fuel tank  #
– Clean air filter  #
– Clean spark plug  #
Fault:
Reduced shredding performance
Possible cause:
– Blunt blades
– Incorrectly ground blades
– Bent blade disc
Remedy:
– Re-sharpen or replace blades (Ö 12.8)
#
– Sharpen blades correctly (Ö 12.8)#
– Visually inspect blade disc and replace
if necessary (Ö 12.3)
Fault:
Shredding material is not drawn in
Possible cause:
– Blunt or incorrectly ground blades
– Gap between the two blades (hard
material blade disc)
– Blade cover not removed
Remedy:
– Regrind blade and ensure sharpening
angle is exactly correct # (Ö 12.8)
– Install blades onto the hard material
blade disc without a gap (Ö 12.7)
– Remove blade cover (Ö 7.3)
19. Troubleshooting
@ See engine instruction manual.
# If necessary, contact a specialist
dealer; STIHL recommends STIHL
specialist dealers.