0458-713-8221-A
9
English 
5 IMPORTANT SAFETY INSTRUCTIONS
components may no longer function properly and safety 
devices may be inoperative. To reduce the risk of personal 
injury and property damage:
– Take the trimmer and battery to your authorized 
STIHL servicing dealer to be checked before further 
operation.
■ Genuine STIHL replacement parts are specifically 
designed to match your trimmer and meet safety and 
performance requirements. Use of parts that are not 
authorized or approved by STIHL may cause serious or 
fatal injury or property damage.
– STIHL recommends that only identical STIHL 
replacement parts be used.
5.6 Using the Trimmer
5.6.1 Before Operation
WARNING
■ Misuse or unauthorized use may result in personal injury 
and property damage.
– Use the trimmer only as described in this instruction 
manual.
■ For proper assembly of the cutting attachment, deflector 
and handle:
– Read and follow the instructions on mounting the 
cutting attachment, deflector and handle, @ 12.
■ The cutting attachment and deflector must be an 
approved combination. Before replacing:
– Read and follow the instructions on selecting the 
proper cutting attachment and deflector, @ 25.1.
■ The cutting attachment must be properly installed and 
tightened before starting work. Failure to use the proper 
parts to mount the cutting attachment may cause the head 
to fly off and seriously injure the operator or bystanders.
– Never mount a cutting attachment to the trimmer 
without the proper installation of all required parts 
(e.g., nuts, screws, thrust washer, thrust plate, etc.).
– Before starting work, inspect for loose parts (nuts, 
screws, etc.) and for cracked or damaged heads.
– Replace damaged heads before using the power 
tool.
■ Using only the approved combination of cutting 
attachment and deflector is extremely important to 
maximize cutting performance and reduce the risk of 
personal injury from thrown objects or contact with the 
cutting attachment:
– To reduce the risk of serious injury, never use wire 
or metal-reinforced line or other material in place of 
the recommended nylon cutting line. Pieces of wire 
could break off and be thrown at high speed toward 
the operator or bystanders.
■ Using a trimmer that is modified, damaged, improperly 
adjusted or not completely and securely assembled can 
lead to a malfunction and increase the risk of serious 
personal injury or death.
– Never operate a trimmer that is modified, damaged, 
improperly maintained or not completely and 
securely assembled.
– Always check your trimmer for proper condition and 
operation, particularly the retaining latch, trigger 
switch lockout, trigger switch, deflector and cutting 
attachment.
– Ensure that the retaining latch, trigger switch lockout 
and trigger switch move freely and always spring 
back to the stop position when released. The trigger 
switch must not engage until the retaining latch is 
unlocked and the trigger switch lockout is 
depressed.
– Never attempt to modify or override the controls or 
safety devices.
– The cutting attachment must engage only when the 
battery is inserted, the retaining latch is unlocked 
and the trigger switch lockout and trigger switch are 
depressed.
– If your trimmer or any part is damaged or does not 
function properly, take it to your authorized STIHL 
servicing dealer. Do not use the trimmer until the 
problem has been corrected.