Repairing; Troubleshooting - Stihl MS 400 C-M Instruction Manual

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► File down the depth gauges with a flat file so
that they are level with the STIHL filing gauge

18 Troubleshooting

18.1 Troubleshooting Chainsaw
Most malfunctions have the same causes.
► Perform the following operations:
► Clean the air filter.
► Clean or replace the spark plug.
► Adjust saw for winter or summer operation.
► If the malfunction still exists: Take the action described in the following table.
Condition
Engine does not
start.
Engine idles errati‐
cally.
Engine stops while
idling
Poor acceleration
Engine does not
reach maximum
RPM.
Saw chain does not
rotate when throttle is
opened.
Smoke or burning
smell while cutting.
26
Cause
Insufficient fuel in the
tank.
Engine is flooded.
Carburetor is too hot. ► Allow chainsaw to cool down.
Carburetor is iced up. ► Allow saw to warm up to +10°C.
Carburetor is iced up. ► Allow saw to warm up to +10°C.
Carburetor is iced up. ► Allow saw to warm up to +10°C.
The chain is over-ten‐
sioned.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
Saw is not correctly
tuned to ambient con‐
ditions.
The chain brake is
engaged.
The chain is over-ten‐
sioned.
Bar nose sprocket is
blocked.
Chain is not properly
sharpened.
Insufficient chain oil
in the tank.
and parallel to the service mark. The STIHL fil‐
ing gauge must match the chain pitch.
► If you have any queries: Contact your STIHL
servicing dealer for assistance.

17 Repairing

17.1 Repairing the Chain Saw,
Guide Bar and Saw Chain
The chain saw, guide bar and saw chain cannot
be repaired by the user.
► If the saw, guide bar or saw chain is damaged:
Do not use your saw, guide bar or saw chain,
and contact your STIHL servicing dealer.
Remedy
► Mix fuel and refuel the chainsaw.
► Clear the combustion chamber.
► Tension chain properly.
► Increase oil feed rate.
► Calibrate the saw.
► Disengage the chain brake.
► Tension chain properly.
► Clean the bar nose sprocket with STIHL resin solvent.
► Sharpen the chain properly.
► Fill up with chain oil.
17 Repairing
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