question 79366 2 stage snowblower

[papadave 8]

my chain came off can;t figure out why except it is stretched so getting a new one,my question is on the middle big sprocket ( connected to the propeller)moves back and forth a little,maybe a 1/2, is that normal ? can;t find anything related to this and don;t know if it is not supposed to move if thats what made the chain to stretch

 

thank you

Edited January 16, 2024 by papadave

[lynnmor 7,812]

There really is no such thing a chain stretch, only extreme wear.  With a chain wrapped around a sprocket, pull up in the middle of the wrap to see if it comes up more that half a tooth.  If that test shows extreme wear it is time to replace the chain and likely the sprockets as well.  In the future, oil the chain after every use.  I haven't looked at your particular setup, perhaps it is for an XI model.

[Handy Don 14,036]

2 hours ago, lynnmor said:

With a chain wrapped around a sprocket, pull up in the middle of the wrap to see if it comes up more that half a tooth

 

Of course, there are tools to measure chain for wear, too, but this method works well. Note that if a chain is badly worn, it has almost certainly put extra wear on the all the sprockets it has been running over. Poor lubrication kills both components surprisingly quickly. A new chain on worn sprockets will wear very rapidly.

 

The the other causes of chain falling off include a broken chain link or a misaligned sprocket.

[WHX?? 51,732]

6 hours ago, papadave said:

moves back and forth a little,maybe a 1/2, is that normal ? 

No it's not ... you got something else goin on there and the only way is to pull it all apart and have a look see. 

[papadave 8]

7 minutes ago, WHX?? said:

No it's not ... you got something else goin on there and the only way is to pull it all apart and have a look see. 

thank you for your response, any suggestions on what i might be looking for ? never done it before but i can take apart anything  lol

[Handy Don 14,036]

I’ll leave you in the capable hands of members with inside knowledge of blowers! 

[WHX?? 51,732]

If your saying that sprocket moves that much a loose set  screw, bad key, bearing out?? 

Could be a couple of things. 

8 minutes ago, papadave said:

but i can take apart anything  lol

I can too it's putting in back together that's my pit fall...

[wallfish 18,076]

10 minutes ago, papadave said:

thank you for your response, any suggestions on what i might be looking for ? never done it before but i can take apart anything  lol

Ther's a Bearing behind the the big sprocket with locking set set screws. That's what holds that shaft in place

[WHX?? 51,732]

Yep and please remind mister 'Fish his name looks better in RED... 

[papadave 8]

6 minutes ago, wallfish said:

Ther's a Bearing behind the the big sprocket with locking set set screws. That's what holds that shaft in place

thats what i am seeing also,part # 110569  gonna look around for a non toro one,toro oem wants around 100 for one

 

[papadave 8]

11 minutes ago, WHX?? said:

If your saying that sprocket moves that much a loose set  screw, bad key, bearing out?? 

Could be a couple of things. 

I can too it's putting in back together that's my pit fall...

yeah, i;m trying to get as much info and parts ahead of time as possible to do it,below 0 here in minn but heat wave next week in the 30;s so hopefully do it then

[wallfish 18,076]

4 minutes ago, papadave said:

thats what i am seeing also,part # 110569  gonna look around for a non toro one,toro oem wants around 100 for one

 

It's a common bearing and nothing special. Bought mine at TSC.

Also check the little sprocket for wear. It's hard to see when it's installed but the teeth can wear on the drive side from the chain slipping over them and make them look like little shark fins with a slight curve on the side. That curve forces the chain off the sprocket. Mine was breaking master links because of that.

[papadave 8]

3 minutes ago, wallfish said:

It's a common bearing and nothing special. Bought mine at TSC.

Also check the little sprocket for wear. It's hard to see when it's installed but the teeth can wear on the drive side from the chain slipping over them and make them look like little shark fins with a slight curve on the side. That curve forces the chain off the sprocket. Mine was breaking master links because of that.

thank you for the tip ! i will probably get a set of those also,in for a dime in for a dollar lol how do you take off the sprocket/bearing ? i see the set screws ,is that it ?

[wallfish 18,076]

1 hour ago, papadave said:

thank you for the tip ! i will probably get a set of those also,in for a dime in for a dollar lol how do you take off the sprocket/bearing ? i see the set screws ,is that it ?

Yes, PITA because they're typically rusted on there but it's keyed to the shaft and held with set screws.

Then you'll see the bearing.

Sprocket might be loose on the shaft and the bearing fine.

Just got to get in there and inspect to find out what's going on

[wallfish 18,076]

8 hours ago, lynnmor said:

There really is no such thing a chain stretch, only extreme wear.

I thought that too but apparently cheap chinese chain stretches. When replacing mine I just counted the number of links from the old one for making the new one. Couldn't understand why it was so tight like a miscount for the number of links. Hung them both from a nail and the old one was noticeably longer with the exact same amount of links. Pretty sure they both came from the same length of chain too!  Bought at TSC at 10ft length. The blower was breaking master links and destroying chains because the little sprocket had worn teeth plus that thing works hard, especially when doing those nasty DOT piles at the street.

Have since bought a better quality chain so let's see what happens this year. Went tight chain this time with use of a half link and going with no tensioner at all.

[lynnmor 7,812]

6 hours ago, wallfish said:

I thought that too but apparently cheap chinese chain stretches. When replacing mine I just counted the number of links from the old one for making the new one. Couldn't understand why it was so tight like a miscount for the number of links. Hung them both from a nail and the old one was noticeably longer with the exact same amount of links. Pretty sure they both came from the same length of chain too!  Bought at TSC at 10ft length. The blower was breaking master links and destroying chains because the little sprocket had worn teeth plus that thing works hard, especially when doing those nasty DOT piles at the street.

Have since bought a better quality chain so let's see what happens this year. Went tight chain this time with use of a half link and going with no tensioner at all.

Yes, chains will get longer with use and abuse but it is the wear in the pins and bushings within the chain.  If the side plates were to stretch the chain would get longer every time maximum engine torque was applied.  Perhaps there is cheap junk out there that is not up to specification.

[papadave 8]

15 hours ago, wallfish said:

Yes, PITA because they're typically rusted on there but it's keyed to the shaft and held with set screws.

Then you'll see the bearing.

Sprocket might be loose on the shaft and the bearing fine.

Just got to get in there and inspect to find out what's going on

how do you remove sprocket ? got the 2 set screws out but doesn;t budge,when you sayed its keyed to the shaft,not sure i know what that means ?

[wallfish 18,076]

2 hours ago, papadave said:

how do you remove sprocket ? got the 2 set screws out but doesn;t budge,when you sayed its keyed to the shaft,not sure i know what that means ?

It slides off the end but it's probably rusted to the shaft so soak with some penetrating oil. Put some in the set screw holes too.

Keyed = there's a slot for a shaft key in both the shaft and the sprocket so the sprocket can not spin on the shaft.

[papadave 8]

Just now, wallfish said:

It slides off the end but it's probably rusted to the shaft so soak with some penetrating oil. Put some in the set screw holes too.

Keyed = there's a slot for a shaft key in both the shaft and the sprocket so the sprocket can not spin on the shaft.

i was just getting ready to write,i got it off,kept soaking it all day. now i come to the collar,got 1 set screw out is their a 2nd ? there is a hole but it doesn;t look likes it threaded. also the cover behind that with 3 nuts and a grease nipple on it,does that come off also ?  thank you so much

[Wayne0 1,182]

47 minutes ago, papadave said:

i was just getting ready to write,i got it off,kept soaking it all day. now i come to the collar,got 1 set screw out is their a 2nd ? there is a hole but it doesn;t look likes it threaded. also the cover behind that with 3 nuts and a grease nipple on it,does that come off also ?  thank you so much

On the collar there will be an un-threaded hole to use a punch in to rotate the collar to lock it on the shaft. Eccentric like a cam.

[papadave 8]

2 minutes ago, Wayne0 said:

On the collar there will be an un-threaded hole to use a punch in to rotate the collar to lock it on the shaft. Eccentric like a cam.

thank you ! does the triangle 3 nuts behind it have to come off ?

[Wayne0 1,182]

3 minutes ago, papadave said:

thank you ! does the triangle 3 nuts behind it have to come off ?

Only if you want to pull the bearing.

[papadave 8]

1 minute ago, Wayne0 said:

Only if you want to pull the bearing.

i will be replacing the bearing so i guess yes,in that case i started to loosen one of them and it seemed like if i took the nut off the bolt would fall off the other side and i looked is it behind the propeller ? then would i have to take that off also ?

[wallfish 18,076]

1 hour ago, papadave said:

i will be replacing the bearing so i guess yes,in that case i started to loosen one of them and it seemed like if i took the nut off the bolt would fall off the other side and i looked is it behind the propeller ? then would i have to take that off also ?

Yes that bearing cage needs to come off to get the bearing out.

If you need to, take the fasteners off both ends of the auger so you can pull that whole assembly forward and out.

This is a good time to inspect those paddles. Straighten them before assembly

[papadave 8]

11 minutes ago, wallfish said:

Yes that bearing cage needs to come off to get the bearing out.

If you need to, take the fasteners off both ends of the auger so you can pull that whole assembly forward and out.

This is a good time to inspect those paddles. Straighten them before assembly

thank you !