Important Parts of a Chainsaw

Chainsaw Parts Essential for Operation and Safety

Chainsaw with numbered parts

OSHA 

There are 10 typical parts of a chainsaw identified and illustrated. Occupational Safety and Health Administration (OSHA) requires that the chainsaw ​have the parts identified in ​bold italic text. Chainsaws placed into service after February 9, 1995, must also meet the requirements of ANSI B175.1-1991, safety requirements for gasoline-powered chainsaws.

01
of 10

Chain Catcher

The chain catcher (figure 1) is a metal or plastic guard designed to prevent a broken or derailed chainsaw from striking the operator.

02
of 10

Flywheel

The flywheel (figure 2) is a weighted wheel that controls engine speed and assists in cooling the engine.

03
of 10

Clutch

The clutch (figure 3) attached to the chain sprocket, is the connector that controls the driving part of a chainsaw.

04
of 10

Decompression Valve

The important decompression valve (figure 4) releases saw compression which allows easier starting.

05
of 10

Anti-vibration Handle System

The anti-vibration handle system (figures 5 and 7) handles shocks is recommended by OSHA to limit ergonomic stress to the operator's hands, arms and joints.

06
of 10

Handguard

The handguard (figure 6) is a defensive plastic shield that protects a user's hands from kickback.

07
of 10

Muffler

The muffler (figure 8) is a hearing protection device used on chainsaws to reduce engine noise.

08
of 10

Chain Brake

Adding a chain brake (figure 9) to all chainsaws was a safety requirement enabled in February 1995. The function of the chain brake is to stop the chain if kickback occurs to prevent user injury.

09
of 10

Throttle

The throttle (figure 10) regulates a saw's RPMs by increasing or decreasing the volume of fuel to the cylinders. The chainsaw will stop the chain when pressure on the throttle is released.

10
of 10

Throttle Interlock

The throttle interlock (figure 11) locking mechanism prevents the throttle from activating until the interlock is depressed.