CS-400 DESCRIPTION
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© 08/2020 ECHO Incorporated
Guide Bar and Saw Chain Installation / Removal
Note:  Align the brake connector (B) of the sprocket guard to the 
groove on the side of the brake lever (Front hand guard). 
1. Remove air cleaner cover and 
disconnect spark plug lead.
2. Move the chain brake lever (A) 
(Front hand guard) fully 
REARWARD (UNLOCK chain 
brake) to remove or install the 
sprocket guard (C).
3. Remove sprocket guard nuts (D) 
and remove sprocket guard (C).
4. Remove guide bar and saw 
chain if necessary. 
Note:  See “Maintenance and 
Care” section for guide bar 
/ saw chain maintenance 
procedures.
5. Mount guide bar on studs (E) and 
slide toward clutch drum (F) to 
make saw chain installation 
easier. Install saw chain around 
sprocket and guide bar as 
shown, with cutters on top of 
guide bar facing forward.
6. Install sprocket guard over guide 
bar studs. Ensure chain tension 
adjuster pin (H) fits into the guide 
bar adjuster hole (G), brake band 
(J) is positioned around clutch 
drum (F). Tighten sprocket guard 
nuts finger tight.