CS-400 MAINTENANCE
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© 08/2020 ECHO Incorporated
For information about maintenance kits.
Maintenance Intervals
Units equipped with a Momentary STOP Switch automatically 
return to RUN position. Engine can start unintentionally. Always 
remove spark plug lead from spark plug before assembling or 
performing maintenance procedures, otherwise serious 
personal injury can result.
COMPONENT / SYSTEM MAINTENANCE PROCEDURE
REQ’D 
SKILL 
LEVEL
Daily or Before Use
Air Filter Inspect / Clean * 1
Automatic Oiler Inspect / Adjust 1
Oil Filter Inspect 1
Fuel System Inspect  1
Guide Bar & Sprocket Nose Inspect / Clean * 1
Saw Chain Inspect / Sharpen / Replace / Ten-
sioning *
2
Sprocket Inspect / Replace * 2
Cooling System Inspect / Clean 2
Recoil Starter Rope Inspect / Clean * 1
Screws / Nuts / Bolts Inspect / Tighten / Replace * 1
Every Refuel
Fuel System Inspect  1
Guide Bar & Sprocket Nose Inspect 1
3 Months
Air Filter Replace * 1
Oil Filter Inspect / Replace * 1
Fuel Filter Inspect * 1
Fuel Cap Gasket Inspect * 1
Spark Plug Inspect / Clean / Replace * 1
Muffler Spark Arrestor Inspect/Clean/Replace * 2