Operation Manual

27BR 420
English / USA
1) STIHL recommends that this work
be done by a STIHL servicing dealer
Maintenance Chart
The following maintenance intervals apply to normal operating conditions only.
If your daily working time is longer than normal or operating conditions are
difficult (very dusty work area etc.), shorten the specified intervals accordingly.
before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required
Complete machine
Visual inspection (conditon, leaks)
xx
Clean
x
Control handle Check operation
xx
Air filter
Clean
x
Replace
x
Pick up body in fuel tank
Check
x
Replace
xx
Fuel tank Clean
x
Carburetor
Check idle setting
xx
Readjust idle
x
Spark plug
Readjust electrode gap
x
Replace after about
100 operating hours
Cooling air intakes Clean
x
Spark arresting screen in muffler
Check
x
Clean or replace
x
All accessible screws and nuts (not
adjusting screws)
Tighten
x
Anti-vibration elements
Check
x
Have replaced by servicing
dealer
1)
xx
Blower air intake screen
Check
xx
Clean
x
Safety label Replace
x