CS-3900 Echo Chainsaw - Overview

This flanged hex nut is a genuine OEM steel fastener specifically designed for use in chainsaws and chop saws, serving the purpose of securing various components in these outdoor power equipment devices. It features a flange base that acts as a built-in washer for extra stability and security. The hex nut has a diameter of 6mm, and its th...Read morereaded shaft has a pitch of 20, ensuring a secure and reliable connection. Over time, the bolt can be susceptible to corrosion, cracks, or worn threads, which may result in the loosening or detachment of the connected parts. Detectable signs of such issues include excessive noise, vibrations, and equipment instability. To address this, it is recommended to inspect all bolts within your equipment and replace any that are no longer functioning properly. To replace the bolt, simply use a wrench or socket to loosen and remove the old one, position the new bolt on the mounting surface, and securely tighten it until the flange is flush against the surface. Please note that each flanged hex nut is sold individually.

The Fuel Filter is a white and silver, individually sold, steel part. It reuires pliers to install and its installation is rated as Easy. The part attaches inside of the fuel tank and is used to clean the fuel of debris. It should be changed regularly. Check your owners manual for the recommended replacement schedule for your engine. ...Read moreIf the fuel is leaking or their is a blockage, you will know the part is broken and will likely need to be replaced. To check for small leaks, feel around for dampness and the smell of fuel.

This is a genuine manufacturer sourced replacement part designed for use with trimmers/edgers. This screw is a standard hardware which has multiple applications based on your tool. It is made out of metal and it is sold individually. Requires a hex key/allen wrench to tighten/loosen this screw.

This replacement tensioner is specially designed for use with Echo pole pruners/chainsaws. This part is a crucial component of chain tensioning mechanism. If the bar doesn't adjust when you turn the tension screw usually the tensioner pin or the adjustment bolt is worn or damaged. This part is made out of metal and it is sold individually.

Genuine OEM replacement part used on Echo chainsaws. This part keeps the fuel tank sealed and prevent gasoline from leaking. This item includes a retainer that remains in the tank to keep the fuel cap from being lost or falling on the ground. It also has an o-ring supplied with it to seal the cap. After time this o-ring will deteriorate a...Read morend become brittle causing fuel to leak from the tank. It will then have to be replaced.

Used in over 150 models of outdoor power equipment, this clip is commonly used to clip fuel lines or other hoses/tubes in place. It is sold individually, not as part of a kit or assembly, made of metal, and is silver in color. When this clip becomes damaged or worn, it can no longer support the fuel line, which may cause a fuel leak and...Read more/or smell. This wear will occur as part of regular use of your equipment. To complete this repair, you will need a wrench, screwdriver, and pliers. It is found in a variety of locations depending on your model; please refer to your owners manual for the exact location. Customers rated this repair as Easy.

This spark plug wire, also known as a spark plug coil or spark plug cap coil, is compatible with various makes and models of hand-held outdoor power equipment and is sold individually. This wire is installed within the spark plug boot and attaches to the spark plug for the ignition of your equipment. The spark plug wire is often exposed t...Read moreo extreme heat and excessive vibrations, so through normal wear and tear, it will likely break down. If your equipment is having difficulty starting or has general performance issues, the wire may be the reason why. To replace this wire, make sure your equipment is off before removing the wire and boot from the spark plug. Remove the boot from the wire and install the new wire within the boot before re-installing the boot back to the spark plug.

This OEM metal washer is commonly used on a variety of different small engine/lawn equipment models and is sold individually. This washer is used to help evenly distribute pressure from the securing bolt or screw with the cylinder cover, to reduce any effects of vibration from the engine. If the connection between the securing fastener be...Read morecomes loose, or if you are replacing the fastener itself, it is recommended that you replace this washer as well.

This replacement spark plug cap is a genuine OEM sourced item designed for use on handheld lawn and garden equipment. It is used to insulate the plug and wire terminal. Over time rubber material can dry out and crack requiring replacement. Please note, this item is sold individually.

This authentic item is supplied directly from the original equipment manufacturer for use with chainsaws and engines made by Echo. The stud attaches to the crankcase. A wrench may be necessary during the installation of this part. It is made out of metal and will need to be replaced if it breaks or strips. This part is available as an individual replacement.