Husqvarna 395XP Chain Tensioner Screw

This Husqvarna 395XP chain tensioner screw replaces the adjusting screw that moves the bar to set chain tension. When the threads strip or the screw bends, you cannot hold proper tension, which is a problem on a saw running a long bar.

Why tension matters

A loose chain can jump the bar, and a chain that is too tight wears the bar and sprocket fast. The tensioner screw is the small part that lets you set it right. If turning it does nothing, or the bar walks loose during a cut, the screw or tensioner nut may be stripped.

On a big saw like the 395XP running a long bar, holding tension is even more important, because a thrown chain does real damage.

Big saws vibrate a lot, and over time the tensioner threads can wear, especially if the bar nuts are not tightened fully before cutting. Overtightening the screw against a stuck bar can also strip it.

Replacing it

Pull the side cover and bar, inspect the tensioner screw and the pin that rides in the bar, and replace worn parts together. Match part numbers in Husqvarna's parts list. Related parts are in power equipment parts.

Work on a cool saw with the chain brake on. Set tension so the chain pulls freely by hand but does not sag from the bottom of the bar, and recheck after the first few cuts.

Tighten bar nuts firmly after setting tension, and do not crank the screw if the bar will not move. Loosen the nuts first, then adjust.