The chain brake on the Husqvarna 455 chainsaw is put under a lot of pressure by the spring that it's attached to, which sits just above the clutch. This spring activates a lever that immediately stops the clutch from spinning. This spring or lever can either get locked in place or won't engage the clutch properly. To reset the chain brake you will need to reset this spring and lever. Because this spring is under so much tension you should always wear safety glasses and gloves when removing it.
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Things you need
- Small punch
Disengage the chain brake (if possible) by pulling back on the plastic handle that runs across the top of the saw. Loosen the bar tensioner screw to remove the tension on the chain. Turn the screw counterclockwise until the chain sags lightly under the bar.
Remove the bar cover nuts with the wrench. Pull off the bar cover, bar and chain. Set them aside in a safe place. Engage the chain brake by pushing the handle forward.
Unscrew the hand guard retaining screw. Push the screw back into the pivot sleeve and rethread it two rotations. Use your thumb to push down on the screw and push out the pivot sleeve halfway.
Turn the cover over. Pound the pivot sleeves all the way out with the punch and mallet. Separate the hand guard from the cover.
Remove the five screws above the clutch that hold the cover in place over the chain brake spring. Take off the cover plate.
Wiggle the flat-bladed tip of the screwdriver carefully underneath the spring. Slowly lift the spring out of the cover.
Punch out the pin that holds the linkage to the brake with the mallet and punch. Turn the cover over and punch out the retaining pin that holds the brake band to the cover.
Check the brake band and assembly parts for any damage or heavy wear. Replace parts as needed. Lubricate the linkage and pivot sleeves with a thin engine lubrication.
Reinstall the brake band and its connecting pin. Insert the band and the linkage into the cover. Secure the cover to the band and linkage with its retaining pin. Slide the end of the spring around the post on the linkage.
Depress the spring with the flat-bladed screwdriver. Push it into place inside the cover. Reinstall the cover plate's five screws. Put the front hand guard back into place and reset the pivot sleeves and their screw. Pull the hand guard back to disengage the chain brake.
Tips and warnings
- Test that the chain brake works properly before operating the chainsaw.
- Never operate a chainsaw if the chain brake doesn't work properly.
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