Troubleshooting Guide - Stihl Fs 251 R Notice D'emploi

21 Troubleshooting Guide

NOTICE
■ Overly long trimmer line increases the load on
the motor and reduces its operating speed.
This may result in overheating and damage to
important components.
Watch a video on how to replace trim‐
mer line on an AutoCut 25-2 mowing
head at bit.ly/Autocut25-2. Click here
or type this address into your browser.
20.5 Sharpening and Balancing a
Metal Cutting Attachment
WARNING
■ Never use a dull or damaged metal cutting
attachment. Working with a dull blade leads to
increased physical strain, increased vibration
load, unsatisfactory cutting results and
increased wear, which can result in loss of
control and injury to the operator or bystand‐
ers. A damaged cutting attachment may
vibrate, crack, break or come off the trimmer /
brushcutter, which may result in serious or
fatal injury or property damage. Make sure the
cutting attachment is sharp and in good condi‐
tion before starting work.
WARNING
■ An improperly sharpened metal cutting attach‐
ment can increase the risk of kickout (blade
thrust) and other reactive forces, resulting in
severe personal injury or death. STIHL recom‐
mends having your metal cutting attachment
sharpened and balanced by an authorized
STIHL servicing dealer to reduce the risk of
severe or fatal injury.
21 Troubleshooting Guide
21.1 Trimmer / Brushcutter
Many performance issues can be resolved with a few simple steps. When troubleshooting, STIHL rec‐
ommends that you start with the following measures:
► Replace the air filter,
► Clean or replace the spark plug,
► As appropriate for conditions, set the trimmer's "shutter" for winter or summer operation,
15.2.
► Adjust the trimmer's / brushcutter's idle speed,
► If these measures do not resolve the issue, continue to the steps described below.
Always shut off the engine before carrying out any inspection, cleaning or maintenance.
Condition
The engine does not
start.
0458-853-8201-A
21.2.
21.3.
Possible Cause
There is insufficient fuel in the fuel
tank.
To sharpen the metal cutting attachment:
► Use a flat file to sharpen dull cutting attach‐
ments. In case of more serious wear or nicks,
resharpen with a grinder or have it sharpened
by an authorized STIHL servicing dealer.
► Sharpen frequently and take away as little
metal as necessary to create a sharp edge.
Two or three strokes of the file are usually
enough.
► Resharpen the cutting edges uniformly. Take
care not to alter the contour of the blade body.
► See cutting attachment packaging for addi‐
tional sharpening instructions. Keep the pack‐
aging for future reference.
To balance the metal cutting attachment:
► After resharpening about 5 times, check the
cutting tool for out-of-balance on a STIHL bal‐
ancer (special accessory) or have it checked
and rebalanced by an authorized STIHL serv‐
icing dealer as necessary.
21.4.
Remedy
► Refuel the trimmer / brushcutter,
10.2.
English
15.1 or
33