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wetheridge


Joined: Dec 17, 2005
Points: 1

Removing shaft and impeller from MDT Snowblower
Original Message   Dec 17, 2005 7:19 pm
I have a MTD 10hp snowblower that is two years old.  While snowblowing I struck a small piece of wood and it bent one auger and the impeller.  Now I need to replace them.  There are two spring pins that hold the shaft into the impeller, can any one tell me how to remove them?

Wayne

Replies: 5 - 14 of 14Next page of topicsPreviousAllView as Outline
spottedpony


Joined: Aug 23, 2004
Points: 301

Re: Removing shaft and impeller from MDT Snowblower
Reply #5   Jan 9, 2006 1:56 pm
vermonter wrote:
 it looks like the pins are just hollow and dont take an allen wrench

It sounds like its very possible they are roll pins (& are called that because they are a piece of hard steel rolled into a pin)  that are driven in and driven out with a punch. easy way to check for sure is see if a small piece of wire will slide clear through them. Roll pins are hollow.  Look closely at the ends also, it will appear the pin is split down one side. They will need to be punched out as they are very hard pins....or be prepared to go through several drill bits & even then its a risk of breaking a bit off inside the pin.
As a last resort if drilling them out is necessary,  find a bit that will just slide through the pin, then start with the next larger bit (best if you have a bit index graduated by 64ths) & just keep drilling through the pin with sequentially larger bits until your pin wall thickness is reduced enough the pin will "spring" easily thus allowing it to be driven out. the big risk here again is breaking a bit off inside the pin.
you might try heating with a torch around the pin to expand the shaft enough the pin releases easier also. or if you have access to a shop press, block up under the pin and press it out.
patsfan


Joined: Jan 19, 2003
Points: 495

Re: Removing shaft and impeller from MDT Snowblower
Reply #6   Jan 9, 2006 3:20 pm
vermonter wrote:
A punch is a good thought as long as the pin isnt threaded...I cant really tell if it is or isnt.  What do you mean by "drill blank"?

Thanks for the advice and GO PATS!



A drill blank is just a length of steel that is a certain diameter that would correspond to a drill size.  as Spottedpony said, those are more than likely roll pins. you should be able to see a split in them.

formerly OT
wishbone


Born to Blow

Location: New Brunswick , Canada
Joined: Jan 6, 2006
Points: 6

Re: Removing shaft and impeller from MDT Snowblower
Reply #7   Jan 10, 2006 11:37 am
I used a dremmel tool with a diamond cut off disk.  ran it right up the center and then popped it out with a screwdriver.  (This was on the shaft behind the impeller bearing which I had to hammer off with a pickle wrench)  Mind you, my machine is a 1978 Craftsman and  nobody had ventured into this unknown territory previously)

Good luck

Jon

DNK1


Joined: Jan 11, 2006
Points: 20

Re: Removing shaft and impeller from MDT Snowblower
Reply #8   Jan 11, 2006 10:36 pm
They are roll pins, or splt pins as some people call them. To do this job you are better off to split the machine in half and remove the whole auger and impeller assembly as one unit. It has to come apart anyways to replace these parts. 
vermonter


Joined: Jan 8, 2006
Points: 3

Re: Removing shaft and impeller from MDT Snowblower
Reply #9   Jan 18, 2006 8:40 am
DNK1, thanks.  After looking at the manual and the blower I realized that taking the roll pins out will not free up the shaft and I need to take the whole machine apart.  Looks like a huge, complicated job, but I have no choice to give it a go.  I cant believe MTD couldnt design a simple way to replace the augers which is probably the part that needs to be replaced most often.  For example, instead of tack welding the sides, the could have bolted them in which would allow you to split the worm gear box open wide enough to  seperate the drive shaft from the auger shaft.  Great engineering MTD
Rocky7722


Joined: Jan 15, 2008
Points: 3

Re: Removing shaft and impeller from MDT Snowblower
Reply #10   Jan 15, 2008 8:24 am
I am disappointed to hear that removing the rolled spring pins doesn't allow the removal of the auger assembly - I have a brand new Craftsman 42" snowblower attachment on a 26 hp tractor and my wife picked up an electrical cord that ripped the shaft out of the bearing cap.  All seems to be intact except that I need to get the shaft back into the bearing cap.  I've unbolted both bearing caps and the upper brace that connects to the auger gear box and thought I only had to press out the rolled pins to remove the auger - not so????  If anyone knows for sure please respond as I am planning to try to pull these pins but won't bother if it won't do the trick.

Thanks for any help you can provide.

Rocky

elbrecht


Joined: Dec 23, 2007
Points: 14

Re: Removing shaft and impeller from MDT Snowblower
Reply #11   Jan 15, 2008 9:05 am
Rocky7722 wrote:
I am disappointed to hear that removing the rolled spring pins doesn't allow the removal of the auger assembly - I have a brand new Craftsman 42"



In my old [1976] Bolens when the bearings on either end of the auger shaft are removed, you jiggle the whole deal a little, and the entire assembly comes out.

In the newer ones, first you need to remove the pulleys & a woodruff key on the end of the impeller shaft.

If you don't have it, there should be a parts breakdown on the sears.com site.  Look it over & see if you can do the same.

Jim

Rocky7722


Joined: Jan 15, 2008
Points: 3

Re: Removing shaft and impeller from MDT Snowblower
Reply #12   Jan 15, 2008 10:00 am
Jim,

Thanks for the info - I'll give that a try.  I did look at the parts breakdown and it appears that the shaft for the auger slides off when you remove the spring pins but there's also a key in the shaft as you described.  Guess there's no easy way is there?  I do know that I've told my wife to stay off the power equipment - every time she tries to help, it costs me time and money.  At least she's out there trying to help!!!

Thanks,

Rocky

Rocky7722


Joined: Jan 15, 2008
Points: 3

Re: Removing shaft and impeller from MDT Snowblower
Reply #13   Jan 15, 2008 10:35 pm
Well I took Jim's advice and went from the back side of the snowthrower.  Appears the same engineer that designed Jim's snowblower also designed the Craftsman.  After removing the drive belt from the rear pulley, I removed the center bolt holding the pulley on the end of the shaft.  I then loosened the rear bearing holder and was able to move the entire assembly forward (after removing bolts on the front auger bearing cups).  Much easier than trying to remove the spring pins. 

Jim thanks for the advice it was right on.

Rocky

trouts2




Location: Marlboro MA
Joined: Dec 8, 2007
Points: 1289

Re: Removing shaft and impeller from MDT Snowblower
Reply #14   Jan 19, 2008 7:35 pm
MTD auger case rebuild questions. In a last post a couple of things were not so clear to me. If I followed him right he:
1 opened up the bottom
2.removed the belt
3 unscrewed unscrewed the pully bolt
4.removed the cup bearing for the back end of the auger drive shaft
5.could pull out the auger after undoing it's two cup bearings.

My confusions are:
1.Aren't there three belts to remove?
2.You might be able to get a wrench in by the pully bolt but you'd have to life up the friction drive disk to get the bold our or later get at the bolts for the auger bearing cup.
3.Because of 2 I think you'd have to move the friction disk out of the way.
4.Because of 3 you'd have to remove the rubber tipped friction disk and because of that it's axle.

I wrote that and just went out to the machine and
1. removed the rubber friction disk axle and rubber friction disk.
2. Then removed the friction disk spring so could lift up the plate it rides on.
3. Removed the pully bolts, removed the pully bolts and removed the two pullys and it's three prong drive plate.
4. That exposed the far end of the auger drive shaft.

The new confusion is how to remove (then later replace) the three bolts that hold the bearing cup. The bolts are turning on bolts on the other side of the case. That is the bolts just in back of the impeller. I can probably wedge a wrench in there and after a while get the three bolts out but what happens later when I go to replace them?

To get them back in with the impeller in the way seems just about impossible. Is that what has to be done somehow???

Another question is and is the reason I'm doing the job it the impeller worm is turning ok but not driving the augers. There's a key in there that might be broken and I'm hoping it's just the key that's broken. If the auger worm is stripped I'm hosed I think.
If the key is ok and the gear it turns is stripped can I buy just that gear? The cheapest I've been able to find for the complete assembly is $160 plus shipping. I maybe got lucky and bought a junker on the net today which I have not seen but the guy says the auger is ok in that unit so I may be able to use that one.
The junker would need to be fixed and possibly need that gear.

The big question is how do I get that now loose auger assembly detached from the rear support cup bearing?
This message was modified Jan 19, 2008 by trouts2
Replies: 5 - 14 of 14Next page of topicsPreviousAllView as Outline
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