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Need to replace sprocket on 930 trek singletrack

The gears on the big outside sprocket are stripped can I do it myself or would I need to bring it to a local bike shop.

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You can try it yourself, it isn't difficult.

Posted on Dec 03, 2014


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How to line the camshaft gears on 2004 dodge stratus to replace timming belt 2.4 duel overhead motor

Hi Darryl, I'm AL the owner of Big As Auto Repair in St Charles Mo

Boy, have I done a few of these, in fact about 400 through the years.

FIRST: Bring your number one piston to top dead center, if you haven't already done so. NOTE: When you have lined everything up you will notice that the crankshaft alignment mark is just a little off, this is OK. The Camshaft marks on the sprockets or cut-out across the sprocket, there will be 2 cut-outs on each sprocket, you will need to line this cut-outs all the way across both sprockets with a straight edge, I always used a ruler. If you need a picture I can send one through your email, go to my website and give me your email through contact us. click here: Auto Repair

Mar 22, 2015 | 2004 Dodge Stratus

1 Answer

The chain sprocket does not move but the moter runs

I think you need to replace the drive gear. look inside the main housing. if you see white plastic shavings that would confirm the gears are stripped.

kits are available for under $25.00. don't buy the one with just the gears, get the new shaft sprocket etc.

Not a difficult repair. However, be sure to follow the instructions carefully. the position of the chain & sprocket when you put it back together do matter.

Good Luck


Mar 02, 2015 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Pedaling bike but wont move

Perhaps there is a gear with stripped thread where it attaches to the sprocket or the sprocket itself with stripped thread? In any of these cases, the whole sprocket should be replaced and in the second case the sprocket and hub. This accounts only for 6 or 7 gear sprockets.

Apr 19, 2014 | Huffy Cycling

1 Answer

My gear will turn without having the chain on . When chain is attached it the motor just works. No chain movement

I wasn't familiar with your saw but I looked at the parts diagram for it in the link below thinking there may be a replaceable drive pin or something like it that would possibly have sheared.
I didn't see any. That would indicate that the sprocket may be stripped out on the inside and would require replacement, or, that there is something stripped inside the gearcase. If you look at the diagram, the motor shaft is parallel with the handle. So to drive the sprocket gear that drives the chain, they use gears inside the housing to turn the sprocket that's at a right angle to the motor shaft. Do you follow me? It would appear from the parts diagram that if it is those internal gears, that it would require replacement of the whole motor/gear assembly ...... probably as expensive as a whole new saw!

The reason that the sprocket turns without the chain on is that there is evidently enough friction between the shaft that the sprocket mounts on, and, the sprocket. But not enough of a connection to drive the chain.

To check further, leave the saw unplugged, and use your finger to try to turn the sprocket. If it turns by hand like that, it would indicate that something is stripped out as I said. To see if it is the sprocket, remove the "Retaining Ring, 5/16" that is shown in the diagram, and inspect the inside of the sprocket. If that appears good, then it would be an internal problem and probably not worth fixing.
Good luck!

Oct 31, 2013 | Remington 111409 - 01 6" Branch Wizard...

2 Answers

Skipping when applying pressure to pedals

needs a gear adjustment hopefully. it might have a stretched chain along with worn cassette teeth. if you have ridden alot of miles in the smaller gears in the rear you might have worn them out. you would have to replace chain and rear sprockets/cassette

Dec 09, 2012 | Trek 4300 Disc

1 Answer

Car began shaking and running badly. Seems like timing

Just started doing it? Had a similar problem with a 90 park ave., When I took the upper timing chain cover off the plastic gears on the cam sprocket had all stripped off. BIG problem. Also my cam was seized. that one went to the salvagers.

Oct 01, 2011 | 1998 Buick Park Avenue

1 Answer

Main gear in door opener striped, model #41A30339.

With stripped gear, you definitely need to look at your garage door hardware! Openers are designed to 'guide' the door up and down, not push or pull. If you have a stripped gear, most likely the opener has been working overtime.

You can check the balance of your door, by disconnecting it from the opener and raising it manually up to about knee level. If it slides down on its own, your springs are fatigued and need to be replaced by a PROFESSIONAL (DO NOT WORK ON THE SPRINGS YOURSELF!)
You can view a how-to video at

You can replace the gear and sprocket yourself if you have a few hours.. a professional will probably charge $150-$200 to replace, which- you can replace the whole opener for not too much more.

If the opener is more than 7 years old, I would recommend replacing the whole thing because all of the other parts will be worn as well, otherwise you can get away with just replacing the gear/sprocket.

Good Luck!

Mar 08, 2011 | Chamberlain 1/2-HP Whisper Drive Belt...

2 Answers

I can hear the motor "working" but the chain is not moving and so door will not open?

Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and I'm sure you will find it is stripped. The part number is 41A2817 and is available at any door opener service company. It comes with instructions.

Mar 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Trek 6500 Shimano deraileur adjustment issues

Derailleur adjustment takes time to master. Try this out:
First, wash your drive train out really thoroughly and use a degreaser (Simple Green works really well) and a chain brush on the derailleur and chain. Rinse it off and let it dry, then relubricate the chain (and ONLY the chain - never lubricate your derailleur). Now flip your bike onto the bars and saddle so you can crank while you shift manually. Use the middle chainring up front to adjust the rear gears. Okay, shift into your highest gear in the back and then release the derailleur cable. Use this opportunity to make certain your "H" setting is good; the derailleur's jockey wheel should be perfectly aligned over the small cog. Now manually push the derailleur to the lowest gear (while pedaling) and set the "L" so the jockey wheel is immediately outside the last cog. crank back to the high gear. Turn the barrel adjuster for the cable tension to its half-way point (figured by unscrewing it all the way and then counting revolutions as you screw it back in). Pull the cable taut and reattach it. Shift into your middle gear (or if it is an even number of gears, pick one of the two middle gears). Use the barrel adjuster to get the jockey wheel exactly over the correct cog. Pedal and shift through the gears. In each gear, back-pedal to make sure the chain is not skipping. You should be able to free-wheel without problem in every gear on a properly adjusted drive train. If the gears are requiring much adjustment on the barrel adjuster, then you may have a bent derailleur hanger. This can be straightened manually without tools if you have a good eye and patience. If it goe that far, come back and repost "bent derailleur hanger".

i hope this helps

Oct 28, 2009 | Cycling

2 Answers

Replace liftmaster 1245R drive/worm gear

I have a 1265 and took the cover off (unplug first).
There are screws securing the cover: 2 on each side at top, 2 at either end bottom.
Then I disconnected the chain.
There are 3 hex head screws securing the drive gear assembly (of course they thread from the inside out which makes taking them out a bit time consuming). Take care not to damage the circuit board or other electronic connections.
Then at the bottom of the shaft is the "limit switch assembly" that is clipped into the metal housing. Squeeze the 2 on the outside and it should swing free.
Then at the very end of the shaft there is another plastic gear. It is secured by a 3 prong plastic clip. Pull the outside clips away from the shaft while pushing the center piece back through the shaft. The gear should come off and you can now remove the gear and sprocket assembly up through the assembly.
call 800 528 2817 and order the "Gear and Sprocket Assembly".
I am waiting for the part and assume we reverse the order above to reinstall.

Oct 23, 2008 | Sears Craftsman LiftMaster Chamberlain...

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