Echo Chain Saw CS4910 2020 Clutch Assembly Replacement

Written By: Alex Diaz-Kokaisl

Comments: 4

Echo Chain Saw CS4910 2020 Clutch Assembly Replacement

Difficulty

Moderate

Steps

Time Required

1 - 2 hours

Introduction

Use this guide to replace the clutch assembly in your Echo Chain Saw CS-4910 (2020).

Although it's not necessary to remove the guide bar, it's highly recommended you do so to minimize any damage to the chain and to yourself.

Tools

Parts

Step 1

Make sure you have the ignition switch turned off before starting your repair.
The chainsaw should be cool to the touch before continuing.

Step 2

Use your fingers to loosen the air filter cover knob.

Step 3

Remove the air filter cover.

Step 4

Remove the air filter
During reassembly, clean the air filter with compressed air or with light brushing before reinstalling it.

Step 5

Use your fingers to pull up and disconnect the spark plug boot.

Step 6

Use a 13 mm wrench to loosen and remove the two nuts securing the sprocket guard.

Step 7

Pull the sprocket guard straight off its two pegs and remove it.

Step 8

Put on gloves before performing the next two steps.
Pull the saw chain away from the tip of the guide bar to unclip it.

Step 9

Push the guide bar towards the back of the device to unclip the rest of the saw chain.
Pull the guide bar away from the device to separate the saw chain from the clutch drum.
Remove the guide bar and the saw chain.

Step 10

Use a T25 Torx driver to remove the two 17 mm-long screws securing the bumper spike.

Step 11

Pull the bumper spike away from the chassis and remove it.

Step 12

Remove the two screws securing the inner guide plate:
Use a Phillips driver to remove the 8 mm-long screw.
Use a T25 Torx driver to remove the 33 mm-long screw.

Step 13

Pull the inner guide plate straight off its two pegs and remove it.

Step 14

Use a 2.5 mm hex key to remove the three 14 mm-long screws securing the brake cover.

Step 15

Pull the brake cover straight off the chassis and remove it.
Make sure the chain brake is in the disengaged position before continuing.

Step 16

Use a 4 mm hex key to remove the two screws securing the chain brake handle:
One 19 mm-long screw
One 23 mm-long screw

Step 17

Rotate the chain brake handle towards the guide bar recess to unhook the brake lever.
Pull the handle away from the chassis to completely remove it.

Step 18

Use a Phillips driver to remove the 8 mm-long screw securing the chain brake assembly.

Step 19

Be careful with this step, as there's tension within the spring. Work slowly to avoid the spring from ejecting.
While holding the spring with one hand, slowly push the brake lever out of its recess until the spring is fully extended.
Remove the chain brake assembly.
During reassembly, insert the spring into its recess first and compress it enough to reinsert the brake lever.

Step 20

Pull the retaining off the chassis and remove it.

Step 21

Pull the torsion spring off the chassis and remove it.

Step 22

Use a flathead screwdriver to pry the collar out of its recess.
Remove the collar.

Step 23

Use a flathead screwdriver, or a 3 mm hex key, to remove the three 18 mm screws securing the engine cover.

Step 24

Pull the engine cover straight up off the engine.
Remove the engine cover.

Step 25

Use a spark plug socket to loosen the spark plug.

Step 26

Remove the spark plug.

Step 27

Insert a piston stopping cord or rope through the cylinder head into the combustion chamber until the crankshaft can no longer turn over.
Do not insert the entire cord into the combustion chamber.