450, 451 and 551 Snowblower Application Notes...

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450, 451 and 551 Snowblower Application Notes...

Postby Tom Scott » Sun Oct 25, 2015 8:33 pm

Over the years this has been a repeated topic of conversation. With winter on the way yet again, I decided to make a sticky out of this information so it is easy to reference. I cut and pasted from posts I made over the years, as I am a bit lazy...

It is important to get the correct blower for pto size of the tractor you are using. Early tractors (GT and SGTs) had a 4.6" outer diameter (OD) front pto pulley. Later tractors (Ser. No. 821,060 and after) had a 6" OD front pto pulley. This change (and serial number) occurred several years into the Cyclops series. Although this was a design improvement, it has created an attachment nightmare for the unaware.

The belt speed produced by the larger 6" pto is much greater, so Cub changed the ratio of the attachments that went with those tractors. In the case of the snowblowers, the early blower that is correct for the earlier series (1811, 1772, 1872, etc. and early Cyclops) would be a model number 450. The later tractors with the 6" pulley used a number 451 snow blower (later upgraded to a 551). The 450 and 451 are essentially identical except for the gear ratio of the main gearbox. Later 451's had yellow paint and a plastic chute, but that is not a surefire way to identify them.

The gears to change the ratios are NLA, and a 451 won't work with the small (4.6") pto as the blower turns so slow it will barely push the snow out of the chute in some conditions.

With the equipment swapping that happens over the years I wouldn't even trust the model number on the tags; the gearboxes could have been swapped out. It is best to check ratio of the main gearbox to determine what blower you have.

Mark the impeller (fan) so that it can be seen from the top of the chute. Mark large 7" the input pulley. Count how many times around the input pulley needs to go for one turn of the fan.

For the 450 it will be 1.87 turns of the input pulley to make one complete turn of the fan.
For the 451 it will be 2.58 turns of the input pulley to make one complete turn of the fan.

No need to be super exact; the ratios are not very close to each other...So, if you come up with something less than 2, then it is a 450. If it is over 2.5 turns, it is a 451.

Unless...you have a 551. The dead giveaway for the 551 is a taller housing that the auger does not fill, but sits in the bottom half. The 450 and 451 have a housing that the auger fits evenly in top and bottom, with no extra room above the auger. Check out the diagrams of them on a parts site, and it will be obvious.
2135, (at parent's)
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 551 snow blower
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby Tom Scott » Sun Oct 25, 2015 8:56 pm

Continuing...

Now to address using a 450 on a large pto (6" OD) later Cyclops (or an earlier tractor that has been retrofitted with the large pto)...

This too is an incorrect application. You are over-speeding the 450 by about 30% with this combination (as opposed to the under-speed condition I described in the first post). You can probably find posts I have made in the past advising against this due to the increased wear and stress on the components.

That being said, the tractor I wanted to use for blower duty last year has a large pto and my 551 was still torn apart for paint. I decided to try the 450 with it to see if it would have less auger packing at the higher speed provided by the large pto. (I have found that 450/451 blowers are miserable at packing the augers in any snow you can make a snowball out of.) This was a real heavy snow and it threw the snow well, but I did break the belt halfway through the job. So in this case as well, it is probably best to still use the right blower for the tractors pto size.

In summary:
Older 4.6" pto tractor should use a 450 blower.
Newer 6.0" pto tractor can use a 451 or 551 blower.
:beer:
2135, (at parent's)
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 551 snow blower
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby SWilliams » Mon Oct 26, 2015 8:30 pm

Nice post.
Might want to add that the above applies to supers as well. And that you need the drop plates and longer belt for the 450/451 on the SGT. The 551 fits both the GTs and the SGTs that the 451 fits, with no drop plates.
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby Tom Scott » Mon Oct 26, 2015 9:26 pm

Good points, Steve. Thanks!
2135, (at parent's)
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 551 snow blower
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby SWilliams » Thu Oct 29, 2015 3:27 am

Here are a couple pictures that show color isn't a true indicator of the model of the blower.
Model& serial tag
451tag.jpg


Overall unit, original paint
451 white.jpg
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby JoeK » Sun Jan 03, 2016 11:53 am

any tips on leveling a blower? mine wants to lift the left side off the ground first
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby dag1450 » Sun Jan 03, 2016 5:47 pm

I dont think there r any adjustments for that? Your cross lifting shaft could b "tweaked". Although if that was the case i could see it wanting to lift the rt side first. idk. How much difference is there Joey? Did u check your tire air pressure? I know when using a loader and front end attachments pressures make a big difference in level from left to rt. Can u tell im just scraping for something :lol: Dave
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby ReicheP » Sun Jan 03, 2016 6:34 pm

JoeK wrote:any tips on leveling a blower? mine wants to lift the left side off the ground first


My 450 does that too. As long as it's flat on the ground that's all that matters.
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby JoeK » Mon Jan 04, 2016 10:54 pm

i got my tire on the right side about 10 psi higher then left to help level it out, helped some but i dont dare lower any more out of the left
1772 - my new toy
2086- main mower at home
Super LT 1554- has it easy mowing the lake lot
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby SWilliams » Tue Jan 05, 2016 11:06 am

About the only way to level them is to either twist the lift rod or alter the lift links. You might want to check the lower pivot on the blower. Many of them have bolts and washers spacing the blower away from the lower links. If those were missing on one side it could cause the blower to lift crooked. Just don't try to eliminate the "play" that allows the blower to follow the terrain.
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby l palma » Fri May 05, 2017 8:22 pm

I raised my hand and want to ask a question about the auger gear boxes that are on the 450 and 451, they show different gear tooth count on those also, would you have to change those also to make sure too much or little snow is being fed into the fan?
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby Tom Scott » Fri May 05, 2017 8:45 pm

Hi, Lew, nice to hear from you.

No, they are both geared the same, which makes sense...

All the gearing change was done with the main gearbox. The auger gearbox only changes the speed of the auger in relation to the fan. Since Cub's goal was to only correct the input speed for the new larger pto, the auger to fan relationship would stay the same.

They did make a change in the gearbox which only changed the housing, but the guts stayed the same. As further evidence of this, both the 450 and 451 call for the same replacement gearbox, part # 917-0871A, and both gears carry the same part number for both styles of gearboxes. I swapped a newer style box into a 450 and it is the same other than the appearance of the housing.
:beer:
2135, (at parent's)
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 551 snow blower
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby nddragoon1 » Fri Jan 19, 2018 12:30 pm

The info on the 551 and SGT's is great...but I'm missing one prime piece, what size belt to use?

I have the 551 snowthrower attached to a 2082 with the 6inch PTO pulley. The gear ratios seem correct as this setup really chucks the snow when its working properly. The problem is...I shred belts quickly (literally leave small pieces of the belt that I can see on the ground). It seemed to me that the belt was catching on the snowblower drive pulley cover. I made sure there were no sharp edges and ground down the small screws on the inside just to be sure. The tensioner pulley does seem to move more than I think it should, creating slack and then catching and kicking off as the belt leaves the tensioner, does its 90 degree twist and entering the drive pulley.

All of the pulleys are smooth. I talked to a gentleman yesterday who suggested I was using the wrong size belt. I've been using an 89" but I think that is if you have the 4" PTO. The circumference difference would suggest using an 86" belt. Thoughts?

The other thing that seems suspect is the belt runs pretty deep in the tensioner and idler pulleys. The top of the belt probably sits close to 1/2" below the outer diameter of the pulleys....potential issue?

As alway...any help is much appreciated.
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby Tom Scott » Sat Jan 20, 2018 12:24 am

The 551 is only intended to be used with the 6" pto pulley and does not change in mounting height between GT and SGT, therefore... there is only one belt specified for the 551, as per the parts listings: Cub part number 954-0341 which is a 5/8" x 89" belt. Nothing should be rubbing or interfering with the belt.

You do not want to use just any belt. It should be a for real "lawn & garden" belt. I would recommend either the factory Cub belt or a "Gates PoweRated". The Gates PoweRated number is 6989. I have had good service out of both the Cub and PoweRated belts. Other types of belts may not hold up when used in lawn & garden service.

Gates 6989 PoweRated.JPG

Sorry for the sideways pic, just pretend Joe posted it! :lol:
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2135, (at parent's)
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 551 snow blower
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby JMotuzick » Sat Jan 20, 2018 9:44 am

Looks perfect from here !
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby nddragoon1 » Tue Feb 06, 2018 7:41 am

Well, I picked up the OEM belt from a local dealer. First impressions were it is much more sturdy. I blew 10-12" of snow yesterday for over an hour with no issues. Thanks for the advice.


Spoke to soon....I didn't just shread the belt...I ripped it to pieces. I'm throwing my hands up...bringing to the shop.

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Re: 450, 451 and 551 Snowblower Application Notes...

Postby SWilliams » Mon Mar 05, 2018 4:58 pm

Double check that the pulleys are good and that you have the correct tensioner spring. Then with the belt on look down from the top at the actual alignment of the belt. The tensioner arm likes to twist and throw the belt tracking off.
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby nddragoon1 » Sun Mar 18, 2018 11:31 am

I think it is the idler and tensioner pulley. I think the belt is sitting way to deep and both pulleys which actually increase the horizontal distance between the idler and tensioner and the snowblower drive pulley. I believe this is resulting in not only the 90 degree twist in the belt between pulleys but also adding the belt to do so at an angle rather than vertically. This is causing the belt to "shave" on the side of the idler and pulley....diagnosis....I need new pulleys. Crappy part...they are expensive. Anyone know of a lower cost alternative to the OEMs?
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Re: 450, 451 and 551 Snowblower Application Notes...

Postby SWilliams » Tue Mar 20, 2018 10:43 am

The belt is supposed to turn 90 degrees between the pulleys. The belt is also supposed to set deep in the idlers, that is to keep the belt on. Properly installed the belt should set in the clutch pulley, then each side should twist 90 degrees to set in the idler and tensioner pulleys then out of them with a twist so it sets on the blower pulley.
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