Stihl

MANUEL TEST TO CHECK TENSION ON CHAIN SAW
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It is relatively easy. Once the chain is on, and the brake disengaged, pull the chain with two fingers (don’t pull too hard) from the middle of the bar. You should be able to see most of the drive tooth. Be sure to check it regularly.

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Generally speaking, the chain should be a little loose on the chain saw guide bar, but not loose enough that the drive links come out of the bar nose. The bar links should feel like they are raising up, but not actually come out of the guide bar.
To determine whether the chainsaw chain is stretched, pull the chain away from the chainsaw`s guide bar to see if there`s space between the two. If there`s space between the chain and the chainsaw`s guide bar, then the chainsaw chain is stretched.
If you are replacing a Stihl® chain, you can look at the numbers on the side of the chain to determine pitch, gauge, and other characteristics of the chain. Example: Your chain has the number 33RM2 stamped in the side of it. The last three numbers (or letters) denote characteristics of the chain.
Force, which in this case is chain tension (since that is how the pedal force is transferred to the rear wheel), is torque divided by radius (i.e., force = torque/radius).
Good Tension-

A properly-tensioned chainsaw chain should still be just a little loose on the chainsaw guide bar, but the chain needs to be tight enough that you can`t pull the drive links out of the bar nose.

There is a tension screw located near the base of the bar on the chainsaw. To tighten the chain, turn it clockwise, and to loosen turn it counterclockwise. Don`t over-tighten the chain as this could cause it to break.
A simple way to check for low compression is to place the chainsaw on the ground and use the starter rope to lift it. Good compression will prevent the rope from pulling out. You should be able to carefully lift the weight of the chainsaw by the starting cord.
The number most commonly agreed on for a worn chain is one per cent elongation between links. In reality though, you should replace the chain before this point. So, therefore, anything past 12 1/16in (0.5 per cent) would be the time to replace a chain.
There is a tension screw located near the base of the bar on the chainsaw. To tighten the chain, turn it clockwise, and to loosen turn it counterclockwise. Don`t over-tighten the chain as this could cause it to break.
Check for any debris around the bar and make sure it`s not worn down. If it is, you`ll notice that the rails are shallow. If that`s the case, it will need to be replaced. You will also want to make sure your chain oiler is in good order and that the chain itself does not have any broken teeth.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Lost tension screw on Husqavarna 51. What is size of screw for replacement?
ANSWER : I think its 6.0×1.0 metric

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MS310 CHAIN ADJUSTER REPLACMENT
ANSWER : Http://www.mediafire.com/view/e354e1u6fb081x3
hope this helps

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Cannot tighten the chain bar
ANSWER : Make sure the bar is positioned on the bar adjusting pin before you tighten cover. Adjust tension with bar adjusting screw, then tighten bar bolts.

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The chain popped off and I can’t get it to fit back on.
ANSWER : Losen the bar mounting nut, then losen the chain tension adjustment screw until the chain can be reinstalled, then tighten the tension screw until the chain just sags 1/8″ or so at the center of the bar then retighten the bar mounting nut.

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I just bought a Poulan 16” chain saw with quick adjust chain tensioning. The chain seems to loosen after a short time of use and the chain comes off. Quite disturbing.
ANSWER : 1. It is common for a new chain to stretch. that is probably what occurred
2. I’d hold the tip of the bar 2-3″ above a stump or even a news paper, rev it up for a few seconds and look for a line of bar oil. If none is visible your bar oil reservoir is empty or saw isn’t oiling. If you added oil and it’s not oiling return it to where you purchased it.
HTH
Lou

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How to replace the chain tensioner on a stihl ms391 chainsaw?
ANSWER : Heres the breakdownhttp://www.mediafire.com/view/yuf2qaqm4aeyh1d

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How do I reattach chain after it slipped off – Husqvarna "Chain Saw – 16" Bar, 3 Hp
ANSWER : Normal
0

This will be the basic instruction for most
common saws. Check that the chain brake is in disengaged position by moving the
front hand guard towards the front handle if the saw is equipped with a chain
brake on the handle. Loosen the bar nuts on the clutch cover. Loosen tension
screw or other adjuster (thumbscrew) to allow the bar to be moved toward the
engine. Some saws have this tension adjustment built into the bar. This will
provide enough slack in the chain to able to reinstall it. It may be necessary
to remove the side cover to gain access to the clutch/gear assembly on the side
of the engine if the chain also jumped the gear here. Remove the cover, inspect
for any debris or other obstructions in this area. If none, replace the chain
back over the drive gear and in the bar groove all the way around the bar. It
may be necessary to turn the bar adjuster screw more to provide enough slack in
the chain to do this. Once the chain is in place reinstall the cover and bar
lock nuts. Snug up the nuts but do not tighten these. Turn the bar/chain
adjuster screw to tighten the chain on the bar (take up slack). I usually
tighten to a point where there is no slack between the chain and the bottom of
the bar and I can still turn the chain easily around the bar by hand. With
experience you will get the feel for this chain tension. Once the chain is
properly tensioned, tighten the bar lock bolts/ nuts on the side cover. I hope
this helps you out.

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HOW DO YOU ADJUST TENSION ON CHAIN FOR HOMELITE UT10519
ANSWER : Hi,Turn the tightener till the chain in the center of the bar at the bottom just hangs down about a 1/8″….this will be good… too tight and the chain will not turn…too loose and it will come off…that 1/8″ is usually great for any saw…heatman101

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