Question about Homelite ZR10926 16" Chain Saw

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Chain drive sprocket is not moving. Motor still drives axle so may be a clutch problem

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If the shaft is turning, then you have likely hit the nail on the head. But, make sure that the safety brake isn't on. If you are able to open the throttle, and engine doesn't sound like it is bogging down, then your clutch is likely at issue. But, if it does sound like it is bogging down (heavily), then the brake may still be on as well (perhaps bent / broken shaft from grip guard on top).

A place I often use for ordering obscure parts is at

They may be able to provide (fax email?) a diagram to help you identify part numbers of what you need.

Check your clutch for heat damage, as well as signs of contamination. The heat damage will show up as extreme bluing of the drum assembly, and perhaps the springs. There may be a glaze on the pads. If contaminated, there will likely be a black glazing on the drum and pads.

Posted on Sep 10, 2010


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WEN 6014: Motor is running, but chain doesn't move. Chain sprocket seems fine, cogs are only slightly worn, sprocket fits perfectly, no wear. Is there an internal clutch or connector? Motor worn out?

There is a clutch behind the metal housing where the chain sprocket at the engine end attaches to the chain . There are wear parts with springs on them that have to be changed. ChainSaw Shed Chain Saw Parts for Wen Wagner Brand Chain Saws Chains Bars... You can get parts here.

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1 Answer

Engine runs but wheels do not move

This could be a few things:
1) Your clutch plates may have worn out so that even when the bike is in gear, it will just rev, but no power will be transmitted to the drive shaft (smaller front chain sprocket is the driving gear, larger rear sprocket on the back wheel is the driven gear)
2) The front chain drive sprocket has come off under the cover on the motor - if the chain is really slack, have a look.
3) The front chain drive sprocket SHAFT has sheared. (basically, meaning that the shaft has broken into two parts as it couldn't handle the drive power (torque) being delivered through it to the chain drive) With the motor on, listen for grinding noises internally
when you rev, from the vicinity of the front chain drive cover. If its rough and grindy, the shaft may be sheared. Then with the motor off, take the cover off and leverage the small chain drive sprocket away from the motor with a screwdriver, and see if the shaft can just be pulled out of its sealed opening. Unfortunately with these bikes, the metals used in drive shafts and motors are not always heat-treated or hardened to the standard they should be, so shearing and premature failure can happen.
4) The gearbox or something in it has blown, unfortunately for the same reason above, quality related.
Its fair to say that these great little bikes are here for a good time, but not for a long time.

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1 Answer

Chain does not move on the ms170 stihl chainsaw

I assume you have the correct chain for the bar and that the sprocket on the end of the chain bar goes around. Check the bar for any defects like pinches where the bar has been caught. Check the chain drive cogs for any burs on the edges - often happens if the chain has been run too slack and then come off!

Check the chain drive teeth thickness which should be the same as the chain bar can accept. Check also you have the right pitch chain for the drive teeth on the clutch sprocket. Assuming the chain brake is not on then you should be able to move the chain around the bar when all the slack has been taken out. If the chain and bar checks are all ok then there is a problem with the clutch. With the chain brake off the clutch with the chain drive sprocket on should spin reasonably freely. If not then you need to remove the 'E' shaped circlip in the centre of the clutch drum , remove the washer behind it and slide off the clutch drum. Then remove the roller bearing and be prepared to replace it if it will not run freely. Clean out all the muck in the clutch housing and check for anything obviously broken. If all appears ok then put a few drops of 2 stroke oil on the roller bearing and replace it on the shaft. Clean the clutch drum and replace it on the shaft. Then the washer and 'E' clip and re-fit the bar and chain. Re-fit the cover and tension the chain and try again. If that does not do it then there has to be a problem with the chain bar.

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1 Answer

Mini moto chain jumps off

Sounds like either the chain is loose (adjust tension by moving rear wheel/axle further to the rear), rear chain sprocket is worn, front (transmission end) drive sprocket is worn, or rear wheel is severely out of alignment with the bike.

Oct 07, 2013 | Bell Moto 9 Stunt Helmets, Bell

1 Answer

ST724 drive chain repair

chech to see that the chain has not stretched too much

Jan 25, 2012 | Garden

1 Answer

Chain doesn't move

Sounds like the clutch is slipping due to oil collected on the inside of the clutch drum. Wash out the entire clutch assembly with spray carburetor cleaner and let dry. Make sure the chain can be turned freely by hand, but the chain doesn't droop from the lower bar edge. Hope this helps!

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2 Answers

My electric chainsaw used to carve ice, chain stops while motor still spins when cutting ice

Is there some form of tensioner for the chain or do you believe it's the drive sprocket?Gas chainsaws have a bolt you can tighten which takes up the play in the chain.The drive sprocket is either on a key-way or clutch.I would remove the chain and check the drive sprocket.There must be a clutch to allow the motor to free spin until a given RPM would drive the chain.That clutch is suspect.You didn't give any information(make or model of chainsaw)that I could use to search for an answer for you.Try to work on that clutch,re-post if you need more help.

Jan 13, 2010 | Garden

1 Answer

Motor runs but chain does not move?

Check the chain drive sprocket to see if it moves when the motor runs. If not, there may be a sheared key between the shaft and sprocket or the teeth on the sprocket are badly worn off. Hope this helps!

Dec 22, 2009 | Garden

3 Answers

Mccullough chain saw pm610 chain slips -- maybe clutch issue

have you greased your clutch bearing ever.some times they get dirty and tighten up after running a while.pull your clutch off and clean and grease bearing with a little alex grease,and I mean just a few drops.not meant to have a lot of it,too much will burn the crank shaft and you will have more problems then you started with

Jan 01, 2009 | Garden

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