The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Chainsawr, The Worlds Largest Inventory of Chainsaw Parts

Smith Sawmill Service

Dynamic Green Products Inc.





Author Topic: Stihl MS250: wingnut in sprocket cover keeps coming loose  (Read 5332 times)

0 Members and 1 Guest are viewing this topic.

Offline buckthorn

  • member
  • *
  • Posts: 30
  • Age: 62
  • Location: Black Earth, Wisconsin, USA
  • Gender: Male
    • Share Post
Stihl MS250: wingnut in sprocket cover keeps coming loose
« on: November 04, 2013, 08:48:11 AM »
I just replaced the tensioning gear and the sprocket cover for this unit (which has a quick tensioner), which is only 3-4 years old (the first was defective; the second was worn, perhaps as a result of the first). Now when I'm cutting, I can see the darned wingnut slowly turning bit by bit and coming loose. The first couple of times I ran it with the new tensioner, the chain popped off; probably (I now think) because of the wingnut, which kind of freaked me out. After that I started watching it yesterday, I had to keep tightening it because it kept coming loose. Does this need to be replaced too? Has anyone ever had to replace one of these? I don't get it; I have a MS 270 that's more than 10 years old, and I've never had to replaced either the tensioner or the wingnut (or anything, for that matter).

Offline turnkey

  • Full Member
  • **
  • Posts: 78
  • Location: The Palouse in E Washington
  • Gender: Male
  • I'm new!
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #1 on: November 04, 2013, 01:17:21 PM »
I just replaced the tensioning gear and the sprocket cover for this unit (which has a quick tensioner), which is only 3-4 years old (the first was defective; the second was worn, perhaps as a result of the first). Now when I'm cutting, I can see the darned wingnut slowly turning bit by bit and coming loose. The first couple of times I ran it with the new tensioner, the chain popped off; probably (I now think) because of the wingnut, which kind of freaked me out. After that I started watching it yesterday, I had to keep tightening it because it kept coming loose. Does this need to be replaced too? Has anyone ever had to replace one of these? I don't get it; I have a MS 270 that's more than 10 years old, and I've never had to replaced either the tensioner or the wingnut (or anything, for that matter).

Can't help with that problem.  I have much the same with my MS361. It likes toloosen both bar cover nuts.  I have had the cover, the chain and the bar drop off while I am cutting a few times.  One would think I'd learn to tighten them occasionally but apparently that is too much trouble.  Happened to me just the other day again.

Harry K

Offline beenthere

  • Senior Member x2
  • *****
  • Posts: 26932
  • Location: Southern Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #2 on: November 04, 2013, 02:50:30 PM »
Have never had a loose bar nut on my MS361.

A mystery to me how that could happen to yours...  ::)

I don't overtighten the nuts, but just snug them up.
south central Wisconsin
 It may be that my sole purpose in life is simply to serve as a warning to others

Offline turnkey

  • Full Member
  • **
  • Posts: 78
  • Location: The Palouse in E Washington
  • Gender: Male
  • I'm new!
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #3 on: November 05, 2013, 12:12:02 AM »
Have never had a loose bar nut on my MS361.

A mystery to me how that could happen to yours...  ::)

I don't overtighten the nuts, but just snug them up.

I don't understand it either.  I run 4 Stihls and have run a bunch of older saws in the past 35 years and none but that 361 have ever done it.

Harry K

Offline AKDoug

  • Full Member
  • **
  • Posts: 62
  • Age: 51
  • Location: Alaska
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #4 on: November 05, 2013, 12:22:15 AM »
Are the little teeth on the wing nut that engage the notches in the cover still there? That's what stops it from rotating.

Offline buckthorn

  • member
  • *
  • Posts: 30
  • Age: 62
  • Location: Black Earth, Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #5 on: November 05, 2013, 12:38:25 PM »
Are the little teeth on the wing nut that engage the notches in the cover still there? That's what stops it from rotating.

Hmm, I don't recall seeing any teeth on that piece. When I snapped the old wingnut into the new sprocket cover, I was sort of puzzled as to how the thing is actually supposed to work. Can you please show me a pic of what you mean, or describe it in a little more detail? This may be the key to the who thing.

Offline AKDoug

  • Full Member
  • **
  • Posts: 62
  • Age: 51
  • Location: Alaska
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #6 on: November 05, 2013, 01:08:39 PM »
Does this help?
Never mind...need to figure out how to do a picture on this site.

Offline AKDoug

  • Full Member
  • **
  • Posts: 62
  • Age: 51
  • Location: Alaska
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #7 on: November 05, 2013, 01:19:47 PM »
See the three teeth, the middle one has a piece of metal on it?

Offline buckthorn

  • member
  • *
  • Posts: 30
  • Age: 62
  • Location: Black Earth, Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #8 on: November 05, 2013, 01:36:57 PM »
Thanks for that pic. Never noticed those before, but I never had to reinstall the wing nut before, either. I take it that all of the quick tensioner wing nuts have these? I'll check when I get home tonight, and will post back.

Offline buckthorn

  • member
  • *
  • Posts: 30
  • Age: 62
  • Location: Black Earth, Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #9 on: November 05, 2013, 11:21:28 PM »
Update: I replaced the wingut ($10) and now everything works fine. Hopefully no more part replacements for a while <knock on wood>

==================
I took a look and it all came back to me. The teeth aren't the issue. The part that you pull out to turn is loose; it should snap tight when you finish tightening the wing nut. That spring must be wornworn (why, I don't know). I now remember seeing that piece flapping around while I was cutting; I'd never seen that before. With the teeth disengaged from the notches, the entire wing nut is free to turn and come loose. Seems like I need a new wing nut now.   >:(
I tell you, the quality of some of these parts seems really poor. This is my **third** tensioning gear; I still have the original on my 10 year-old 270. Sprocket cover. Now the wing nut. Engine runs great, though. And the saw always starts.  ;)

Thanks again for helping me figure this out.

Does this help?
Never mind...need to figure out how to do a picture on this site.

Offline double clutchin weasel

  • Full Member
  • **
  • Posts: 63
  • Age: 58
  • Location: Western North Carolina
  • Gender: Male
  • Chainsaws, Caterpillar tractors, & old Mack trucks
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #10 on: November 21, 2013, 11:36:01 AM »
Update: I replaced the wingut ($10) and now everything works fine. Hopefully no more part replacements for a while <knock on wood>

==================
I took a look and it all came back to me. The teeth aren't the issue. The part that you pull out to turn is loose; it should snap tight when you finish tightening the wing nut. That spring must be wornworn (why, I don't know). I now remember seeing that piece flapping around while I was cutting; I'd never seen that before. With the teeth disengaged from the notches, the entire wing nut is free to turn and come loose. Seems like I need a new wing nut now.   >:(
I tell you, the quality of some of these parts seems really poor. This is my **third** tensioning gear; I still have the original on my 10 year-old 270. Sprocket cover. Now the wing nut. Engine runs great, though. And the saw always starts.  ;)

Thanks again for helping me figure this out.

Does this help?
Never mind...need to figure out how to do a picture on this site.

The parts to convert this to a standard side-mount adjuster are not all that expensive.  Here are the instructions, straight from Stihl...
.
.
.
1. You will need to remove the aluminum rail in the recess of the engine housing just
under the bar stud.
2. Remove the rear collar screw aft of the bar stud and replace it with 1 bar stud part
#1123 664 2400.
3. You will need the following part numbers for a side access chain tensioner
application: 1123 007 1004 (Spur gear/chain adjusting screw kit), 1123 640 1900
(Tensioner slide), 1123 664 1400 (Thrust pad), 1123 664 2200 (Cover), and 9075 478
3015 (Pan head self-tapping screw).
4. Once you have the parts in the above statement assembled, you need part # 1123
640 1704 (Sprocket cover), and 2 of part # 0000 955 0801 (Bar nuts). This should
complete the conversion process.
.
.
.
There is a kit 1123 007 1000 which contains the entire tensioner.  But, from what I can see, the individual parts may be cheaper.

Aside from the tensioner itself, there are only a few parts (the side cover, the stud, and the nuts).

You're only looking at $40-50 to eliminate the problem forever.
Eagles may soar, but weasels don't get sucked into jet engines.

Offline deerslayer

  • Senior Member
  • ****
  • Posts: 251
  • Age: 2016
  • Location: Georgia
  • Gender: Male
  • old cars, saws, trucks, tractors
    • Share Post
Re: Stihl MS250: wingnut in sprocket cover keeps coming loose
« Reply #11 on: November 24, 2013, 11:50:26 PM »
may want to ask around to see if someone has used parts on a dead saw if you want to convert to the non c version.

I have an 018C and don't like the tool less chain tensioner any more than I like flippy caps.
Too many chainsaws, not enough wood.
Stihl, Husky, Craftsman, Mac, Homelite, Poulan. Some live here, some just passing through.


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
wanted stihl 090g sprocket cover

Started by recurve60 on Wanted

0 Replies
360 Views
Last post June 12, 2019, 12:02:08 AM
by recurve60
xx
Loose sprocket tip

Started by mike_belben on Chainsaws

17 Replies
2234 Views
Last post April 25, 2018, 11:38:14 PM
by ehp
xx
Oil leaking around clutch sprocket cover

Started by Chefblair on Chainsaws

19 Replies
3459 Views
Last post October 18, 2018, 06:33:25 PM
by Mad Professor
xx
Stihl MS250

Started by GE on Chainsaws

3 Replies
636 Views
Last post June 17, 2017, 01:49:16 PM
by blueberrymuzik
 


Powered by EzPortal