48 replies to this topic

[DL-North]

You don't want that box loose on the blower shaft, it will flop back and forth on the key and wallow out the key way, destroying the shaft.

Usually there are 1 or 2 set screws that both hold the key in and lock the gear box sleeve to the blower shaft. But the alignment has to be good or it will move around anyway. (if this was a spline that transfered the load you'd be OK).

 

Dan

[hammerdwn20]

Yeah normally there are set screws on a sprocket or pulley but the hollow gear has none. It doesn't extend outside of the housing.

[skyrydr2]

Nice job!! Your only issue will be the key in the gear box. Tell ya what you need to do, put a long kwy in the shaft, and drill it and pin in place with either a roll pin or drill and tap with flush hardware.
If it were me, I would drill and roll pin it in. Its easier than fussing with a tap that xould break and ruin a good day.
My Fabco blower also has a reduction box on it from the factory, I'm changing bearings in it as i type LOL. nice thing is it uses regular spindle bearings, 25mmx52mmx15mm .

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Edited by skyrydr2, January 20, 2016 - 05:26 AM.

[hammerdwn20]

That will stop the wear on the input shaft in the blower but how about in the hollow gear of the gearbox?
I'm wondering if I should have just done this with a belt and a few pulleys. Definitely would have been cheaper just more of a PIA to set up.
Any opinions on u joint angles and needing to cancel each other out?

[DL-North]

I looked at the Hub catalog and now see what you are up against.  

Any chance you could return it and get the one with 2 shafts?

Then you could use a Lovejoy (or similar) on it.  

This of course will move the blower farther out to keep the same angle on the drive shaft.

 

Or if you don't expect much use, get an oversize key (0.001") and have a light "line to line" fit on the key to shafts and hope for the best.   (and Loctite the shaft to bore, at final assy) 

Or do a search to see if somebody has a way of locking a keyed shaft to a keyed bore.   

Oh, you could drill and tap (1/4") a hole in the end of the blower shaft to put a screw and large washer to contain the key.

 

Dan

Edited by DL-North, January 20, 2016 - 12:42 PM.

[hammerdwn20]

it was hard enough to get this one and damn expensive from a surplus gearbox seller. the one with two output shafts is over 500$

 

Since the input shaft does not extend all the way through the hollow gear i had intended on installing a steel cup expansion plug to keep the dirt out.  I could cut a piece of round stock to take up the space between the plug and input shaft and that would hold the key in. 

Maybe an rtv or light duty expoxy?

I even though about welding a shaft collar to the hollow gear so it would have set screws but i would have to disassemble the box and turn the weld down in the lathe. 

Before i go through any of this im going to run it and make sure the driveshaft angles will work. 

[hammerdwn20]

Got a test run in. Seems like it's going to work out ok.

[Cat385B]

Are you getting excited to run it through some snow yet?

[hammerdwn20]

Are you getting excited to run it through some snow yet?

Hell yes! I've got 500ft of driveway plus parking area to play with. Sad part is the blowers make short work of it.

[DL-North]

Looks great, nice work.

 

I think your idea of a expansion plug and spacer should be fine, at least until you get some time on it.

 

Waiting to see it throw some snow. 

 

Dan

[blackjackjakexxix]

Looks like it's running pretty true,nice job

[hammerdwn20]

Looks like it's running pretty true,nice job

 

I had that shaft already made up for the 1250 repower thats been on hold for years. all i had to do was cut it down.

 

 

Here is the 3/8" breather i installed. looks huge in the picture. It has a splash guard and vents through a 1/16 hole

 

 

Factory berco cover completely hides the gearbox

[hammerdwn20]

 

Heres a video to show you guys how it worked out with our Blizzard we had last weekend. 18" in the driveway with 36" drifts against the house. luckily i didnt get the 30" we had at work only 30min south of me. 

[blackjackjakexxix]

Looks like it worked pretty well

[29 Chev]

Looks like you got enough snow for to give it a good test and it passed with flying colours (mainly white) - thanks for sharing the video.  Seeing that gearbox and the chain drive setup that skyrydr2 posted a picture of has given me an idea that I hope to try on my homebuilt two stage I have on my 1050 to reduce some weight and cut down on the number of gears and chains that I use to slow the impeller shaft speed down.