Maintenance And Care - Stihl SR 420 Instruction Manual

18 Maintenance and Care

17.1 If not used for periods of about
30 days or longer
► Drain and clean the fuel tank in a well ventila‐
ted area.
► Dispose of fuel properly in accordance with
local environmental requirements.
► If a manual fuel pump is fitted: Press the man‐
ual fuel pump at least 5 times.
18 Maintenance and Care
The following intervals apply for normal operating
conditions. The specified intervals must be short‐
ened accordingly when working for longer than nor‐
mal or under difficult cutting conditions (extensive
dust, etc.).
Complete machine
Control handle
Air filter
Manual fuel pump (if
present)
Fuel pickup body in fuel
tank
Fuel tank
Carburetor
Spark plug
Intake port for cooling air Visual inspection
Spark arresting screen
in muffler
All accessible screws,
nuts and bolts (not
adjusting screws)
Solution container with
hose
Strainer in solution con‐
tainer
0458-372-0121-C
Visual inspection (condi‐
tion, leaks)
Clean
Function test
Clean
replace
check
Have repaired by a spe‐
2)
cialist dealer
check
replace
Clean
Check idle speed
Readjust idle speed
Adjust electrode gap
Replace after every 100
hours of operation
Clean
Check if installed
1)
Check or replace
Tighten
Visual inspection (condi‐
tion, leaks)
Clean
Clean or replace
► Start the engine and run it at idling speed until
it stops
► Thoroughly clean the machine, especially the
cylinder fins and air filter
► Do not expose the solution container to direct
sunlight for unnecessarily long periods. UV
rays can make the container material brittle,
which could result in leaks or breakage.
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