QA42 1450 Gearbox Rebuild and Mod

[Kryptoroxx]

I've found a little information but I don't have the manuals to complete the fix either.

Long story short I was out with snow deep enough to use a snow thrower (for the first time in a while here in Michigan) and it did fine for a while but then the 90 degree box gave out. Now the box has always had wet around some of the seals but I always checked it for noise and never found any. Now the input shaft is the only thing spinning and I imagine I'm probably missing teeth on the interior.

I do have a tiller box which I understand is the same part. Please correct me if I'm wrong.

The largest problem I was having with the thrower itself is clogging. I would be willing to bet its because the exhaust is blowing hot right on the chute area. Since this is a permanent project I figure adding a stack onto the exhaust would relieve this problem.

The second largest problem is the speed of the auger. I imagine dropping an inch or even half an inch on the pulley size would take care of this but would this drop too much torque from the belt grip? Just looking to see if anyone has walked this road. I know someone has.

And since I've probably cooked a gear is there a place where I could get some new gears? Also I imagine I need a press to remove and replace said gears from the input shafts. If I'm going to rebuild the box I might as well make it tough again.

[Gregg Ridlon]

The gearboxes are either the same, or share some of the same parts. I am sure others here will know the score for certain...
The sponsors above would be a good place to start.
Checked Cub Cadet Specialties for example, has gearbox parts.

Best of luck with the repair, let us know what you find when you open it up.

[ol'George]

The gear boxes are physically the same, but have different gear ratios.
You cannot use a tiller gear box to replace a
thrower gear box and vise versa
Been a few years since I worked on them, but seems like one is a 2 To 1 ratio and the other is 1.5 to 1 or similar ratios, IIRR
No new gears, are available but they show up on the internet sites and our sponsors at the top of the page.
I have both but they are not for sale.

[Kryptoroxx]

I have both and it makes me wonder if I have the right gear ratio for the tiller lol just going off of the age of my parts. It's wicked cold right now and I don't have a heated garage without lighting off a diesel powered snail and getting stone on fumes I'll crack it open here soon and hopefully I have the right gear ratio....better yet maybe just a cotter pin broke and it's an easy fix.

[ol'George]

Originally Posted by Kryptoroxx

I have both and it makes me wonder if I have the right gear ratio for the tiller lol just going off of the age of my parts. It's wicked cold right now and I don't have a heated garage without lighting off a diesel powered snail and getting stone on fumes I'll crack it open here soon and hopefully I have the right gear ratio....better yet maybe just a cotter pin broke and it's an easy fix.

Ain't no drive cotter pins.
The thrower is a 2 to 1 ratio and the input shaft is maybe 1/2-3/4" longer that the tiller gear box input shaft is.
The tiller gear box is 1.5 to 1 ratio.

[Kryptoroxx]

Originally Posted by ol'George

Ain't no drive cotter pins.
The thrower is a 2 to 1 ratio and the input shaft is maybe 1/2-3/4" longer that the tiller gear box input shaft is.
The tiller gear box is 1.5 to 1 ratio.

Got it. I'll check my boxes that I have to make sure I have the right one in the right location. I picked up my stuff second or third hand and am using the g2 I've been given to figure this stuff out.

I found some schematics and it looks like I toasted a gear. I'll pull it and rip it apart here soon to find out what I broke and possibly rebuild it. I would love to find one of the 3.15 speed up pulley or a 3.5" speed up pulley. I'd imagine that a machine supply would probably have one. It doesn't seem to be something that unique??

[ol'George]

Originally Posted by Kryptoroxx

Got it. I'll check my boxes that I have to make sure I have the right one in the right location. I picked up my stuff second or third hand and am using the g2 I've been given to figure this stuff out.

I found some schematics and it looks like I toasted a gear. I'll pull it and rip it apart here soon to find out what I broke and possibly rebuild it. I would love to find one of the 3.15 speed up pulley or a 3.5" speed up pulley. I'd imagine that a machine supply would probably have one. It doesn't seem to be something that unique??

FWIW:
They are not schematics, as that term refers to electrical drawings of circuits.
( just to help)

Ebay/internet/motion industries/Granger and surplus center, all have pulleys.
A person can also go one tooth more on the jack shaft drive sprocket to increase the auger speed, but I would caution on playing with that because while an increase in no load auger speed theoretically will throw faster, you need the horse power to pull that extra load, and that you don't have. BTDT

Some years back I did just that, I even experimented with using a tiller box when I sheared a few teeth off in the thrower box.
In short, yes it worked using different sprocket teeth to get the same auger speed/ratio. (math is your friend)
BUT when I was able to locate a good thrower gear box I rebuilt/ installed it, and all works as it should.

The gear box shafts are easily made if worn on the lathe and mill, and the bearings are very common as they are the same bearing(6203)used for Delco Generators/Alternators since the 1930s and today in Many applications like idler pulleys Etc etc.

And "Parts by jeff" at the top of the page makes shafts among other "goodies"

You will prolly find the bigger bevel gear had a couple of teeth broken off.
Trying to remember but seems like one is about 15 teeth and the other 28 or30 teeth.(at my age I cant remember what I had for B'fast.)
As said by others:
FULL engine rpms and keep its mouth full of snow till rpms just start to drop is the sweet spot for throwing snow far distances.
When all is back together check your RPMS with a $ 10 ebay tach.

If you search my 6000 ++ posts some years, back I cover most all of what I have just written.
Hurry, all this frozen sunshine is gonna melt next week!