Instructions / Assembly
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© 1/2017 ECHO Inc.
CS-400 OPERATION
◆ Do not let the tip of the bar 
touch anything while the 
engine is running. At cutting 
speed the chain is moving at a 
high rate of speed. Should the 
tip contact a limb or log while 
the chain is moving, the tip 
will be pushed upward with 
considerable force. This is 
known as kickback. Avoid it!
In all circumstances the operation of the chain saw is a one-man job. It is 
difficult at times to take care for your own safety, so don’t assume the 
responsibility for a helper as well. After you have learned the basic techniques 
of using the saw, your best aid will be your own good common sense.
The accepted way to hold the saw is to 
stand to the left of the saw with your left 
hand on the front handlebar and your 
right hand on the rear handle so you can 
operate the throttle trigger with your right 
index finger. Before attempting to fell a 
tree, cut some small logs or limbs. 
Become thoroughly familiar with the 
controls and the responses of the saw.
Start the engine, see that it is running 
properly. Squeeze the trigger to open the 
throttle wide open and start the cut. If the 
chain is properly sharpened, the cutting 
should be relatively effortless. It is not 
necessary to press down hard to make 
the saw cut. Pushing the saw too hard will 
slow the engine and cutting will actually 
be more difficult.
Sap from palm trees may corrode metal parts unless proper saw 
maintenance is performed. Make sure to clean metal parts from palm 
sap immediately after use.
• Remove sprocket cover. Clean wood chips and sawdust from cover and 
engine crankcase. 
• Never use metal tools for cleaning which may scratch the metal paint and 
allow corrosion to develop. 
• Clean sap accumulation from metal parts with cloth and warm water with 
soap. 
Kickback










