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Use this guide to replace the chain brake assembly in your Echo Chain Saw CS-4910 (2020).
The chain brake assembly is essential for safe operation. If it's not installed properly, it could fail to prevent serious injury.
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Make sure you have the ignition switch turned off before starting your repair.
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Use your fingers to loosen the air filter cover knob.
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Remove the air filter cover.
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Remove the air filter
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Use your fingers to pull up and disconnect the spark plug boot.
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Use a 13 mm wrench to loosen and remove the two nuts securing the sprocket guard.
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Pull the sprocket guard straight off its two pegs and remove it.
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Pull the saw chain away from the tip of the guide bar to unclip it.
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Push the guide bar towards the back of the device to unclip the rest of the saw chain.
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Pull the guide bar away from the device to separate the saw chain from the clutch drum.
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Remove the guide bar and the saw chain.
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Use a T25 Torx driver to remove the two 17 mm-long screws securing the bumper spike.
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Pull the bumper spike away from the chassis and remove it.
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Remove the two screws securing the inner guide plate:
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Use a Phillips driver to remove the 8 mm-long screw.
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Use a T25 Torx driver to remove the 33 mm-long screw.
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Pull the inner guide plate straight off its two pegs and remove it.
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Use a 2.5 mm hex key to remove the three 14 mm-long screws securing the brake cover.
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Pull the brake cover straight off the chassis and remove it.
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Make sure the chain brake is in the disengaged position before continuing.
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Use a 4 mm hex key to remove the two screws securing the chain brake handle:
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One 19 mm-long screw
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One 23 mm-long screw
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Rotate the chain brake handle towards the guide bar recess to unhook the brake lever.
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Pull the handle away from the chassis to completely remove it.
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Use a Phillips driver to remove the 8 mm-long screw securing the chain brake assembly.
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While holding the spring with one hand, slowly push the brake lever out of its recess until the spring is fully extended.
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Remove the chain brake assembly.
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Pull the retaining off the chassis and remove it.
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Pull the torsion spring off the chassis and remove it.
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Use a flathead screwdriver to pry the collar out of its recess.
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Remove the collar.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
