Date: 27 Nov 2006 11:51 am
I recently ''inherited'' a Mastercraft snowblower model number 317 961 515 it runs good and moves under it's own power but the auger doesn't turn, I recall the old guy saying once that he got a ice chunk caught in it once or twice, any ideas what it could be or how to fix it or where to get the parts to do it?...any and all help would be appreciated..thanks...Wolf :?
Date: 27 Nov 2006 12:04 pm
Check the shearpins for the auger blades,if the are fine take a look at the belt that power the auger...
Date: 27 Nov 2006 12:09 pm
Welcome to the Forum!
Like HGK mentioned....
If the impeller is moving but the augar isn't, most likely sheer pins.
If neither the impeller of auger is moving, most likely the belt.
But that's for a 2 stage, I just assumed...
Is it a single or 2 stage?
Date: 27 Nov 2006 12:31 pm
wow talk about fast replies..ok was just out ''playing'' with it, the auger doesn't turn but the impeller does..it sez 2 stage on the unit and i took cover off that sits over the belts they are all good and turn when i depress the lever, i can see it turn the impeller, so if it's sheer pins where do i find them on auger and are they accessable without ripping the auger assembly out?...
Date: 27 Nov 2006 12:56 pm
2 stager, since you got an impeller...
yup sounds like sheer pins.
On the shaft of the auger or better put I guess, the tube of the auger, there should be bolts. The bolts attach the augar halves to the drive shaft.
The drive shaft comes out of that front gear housing between the augar halfs. The drive shafts run through the tube on the auger halves.
Instead of bolts (my machines have two bolts per auger), you'll probably find holes with what looks like broken bolts in them.
You'll need to beat them out of the drive shaft.
You would slip the new ones in/through the hole, and secure with the supplied nut / possible washers.
They aren't normal bolts, but called sheer pins. But basically look like bolts for the most part.
They are designed to break when something gets jammed in the auger, so the gear housing or other drive components dont break instead.
If you find the bolts, with heads and ends with nuts on them, intacked on the augers, see if you can rotate (with the machine off and spark plug wire pulled off) the auger and that it spins on the drive shaft. Or is the drive shaft the auger is on, is it spinning too?
Date: 27 Nov 2006 5:46 pm
ok now things get weird...the auger will turn by hand about 1/2 to 3/4 rotation then stop and get tight..in talking to a relative he sezthe old guy never lubed that silver gear box inbetween the auger halves and believes he might have broke a gear in it..possible?..any suggestuions or ideas?..thanks :thinking:
Date: 27 Nov 2006 5:53 pm
Are the shear pins there, not broken?
Are the holes for the sheer pins clear? did you remove the broken ones?
The broken stubs could be hanging up as you rotate the auger??
And it could be rust on the shaft that auger is on and just not rotating easily.
And could be broken gear too (if the shear pins are still alive, and your turning the drive shaft from the gear box).
The sheer pins are there to protect those gears as well as other parts up stream.
Date: 27 Nov 2006 6:16 pm
ok just checked sheer pins(or lack of, he had put on one side a carriage bolt and on the other side is a reguler bolt) both look in solid shape, at same time i jiggled the auger shaft and it moved freely over the inner shaft the two replacement sheer/ reguler bolts are not tightened full down , when i turned auger shaft it didn't allow me me to turn the auger far enuff to turn the drive shaft on engine side of that silver gear case
Date: 27 Nov 2006 6:29 pm
So if the augers are bolted to their drive shafts, but yet they aren't turning (when powered from the engine and the impeller is turning),, sounds as if the last time he ate ice, he blew the gears cause of the regular bolts.
Date: 27 Nov 2006 6:34 pm
so then is safe to say that that silver gear box is culprit, any ideas as to avaiability of replacment box or gearand if any of the other mastercraft units are interchangable?
Date: 27 Nov 2006 6:44 pm
The auger gearbox has a worm gear driving a spur gear connected to your auger shaft. When you try to turn the auger you are working against the worm gear. You can turn it a bit until the play in the gears and auger are taken up, but then it locks. Basically when you rotate the auger you are trying to push the worm gear up the shaft so the impeller shaft doesn't turn.
It doesn't mean there is anything wrong with the gear box... yet.
Although if you have the auger with intact bolts holding it to its drive shaft and it locks when you rotate it, but won't turn when the engine is driving it, it starts to sound like broken gear teeth.
Using carriage and regular bolts is bad for the machine. If it had jammed with those in place, the gears could break instead. Make sure you get the correct shear bolts. They are there to save the gearbox from damage.
Date: 27 Nov 2006 6:51 pm
When mine was worn but still working, it barely rotated ~1/8th of a turn till the sloop was taken up in the gears.
Turning 3/4's - 1/2 of a rotation before locking up, sounds like missing teeth, doesn't it?
I have no idea of the cost and availability.
Hopefully the members with the parts books and deeper knowledge will chime in regarding the parts and possible associated costs and availability.
Along with the numbers, post a pix or two of the blower and auger area, might help.
Date: 27 Nov 2006 6:53 pm
Mastercraft snow blowers were built by MTD.
I checked their web site, under parts, they show parts for you blower.
If you need parts.
You will need your model and serial numbers.
Date: 27 Nov 2006 7:05 pm
theres a little light at the end of the tunnel...i have both the model and seriel numbers in front of me...looking to see if i can find that mtd now...thanks to everyone helping on this
Date: 27 Nov 2006 7:24 pm
Fred had a good find.
Fred, can you post the link.
Wolfy, if I were you , I would take it all apart 1st and see what's there and not there, get a good picture for yourself of what you have to work with. It'll also make the exploded views a bit easier to follow for finding parts.
Date: 27 Nov 2006 7:33 pm
sounds like the best way to go at this point. found that mtd site and their catalogue fred...i'd like to say thanks to everyone for picking their brains on this...is a wonderful forum...thanks again everyone }:O)
Date: 28 Nov 2006 5:10 pm
Wow MTD sent me a copy of the original owners manual and service manual in pdf form thru email...this should make life a lot easier, hats off to everyone here and MTD
Date: 28 Nov 2006 5:22 pm
Glad that you found us,and we are here to help
Date: 28 Nov 2006 5:26 pm
Sorry, no link, to old for this high tech stuff!!!!!
Just Google MTD and go to their web site.
If we can not help each other in this world, we ought to give up living!!!
Date: 28 Nov 2006 6:30 pm
That's some nice service from MTD.