Kubota BX Snowblower Gearbox Failure & Inspection - No.14

Inspecting the gearbox (part no. 77700-01751) from my Kubota BX2755HD. I thought I knew what to expect. Surprise - something totally different.

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[_below]

fascinating. pretty sure that pin was designed to give out to save your gearset. thank you very much for sharing this.

[bullrush]

When I rebuilt mine that pin was partially sticking out and scraping the brass gear... By luck, I was rebuilding anyway and caught it before it came out completely and damaged it worse...The solution for me was a new split pin and I tacked it on one side with my MIG...I also reversed the brass gear because of the damage...I did a video on the rebuild...working great...thanks for sharing.

[jstein]

I'd been having similar but not identical malfunction of my blower. It was late enough in spring that I just took it off and used the loader, and I'm now just getting to try and service it. I am reluctant to spend the money on the gearbox, but I can't think of anything else. You have also demonstrated that it is a pretty big job for one guy. I may have my late father-in-law's bearing puller set, though. When mine first failed, I broke three shear bolts on the fan in short order in clean snow. When the bolt is in place, the fan does not turn independently of the augur. The blower operates normally without a load and in very small amounts of snow, or proceeding very very slowly. Add some resistance to the augur in deep or heavy snow, it goes thunk and then the fan bolt shears. I can only believe there is a defect in the gear or worm screw that is just enough to make it skip under load, but still keep the augur shaft turning.

[andrewsnyder]

EXCELLENT! This is the second video I've watched where that roll pin had dislodged! In the first video, it came out partially and ate one of the gears!! I just realized by looking at the comments below that it was BULLRUSH's video where the first one failed. I think also from that video, that the fan shaft and 'sector gear'? are now sold as one piece. I think BULLRUSH's 'tacking' it was a great idea!

[pfgpye]

I had this happen to me but luck was on my side another person has the exact same set up as I did and he was a Wonderfull resource to have.

[mattmcneely]

I would assume that’s a rare thing to happen, and it might not be a solid-steel spring pin due to the worm gear not taking as much force as the shear-pin components?
Great find!

[christophergallagher]

This is happened to me, once.
Call it an internal shear pin.
If it where solid the gears would be toast.
You probably loaded both auger shear pins at the same time .
Just keep a roll tension pin in there, as designed! Chris

[je]

Good find but I'm guessing the spring pin is a secondary (or tertiary) safeguard in the event the shear pins do not fail that prevents the gearbox from grenading. As to why the shear pins didn't fail first, I have no idea.

[Mork]

James, interesting how something so simple can be so expensive to fix. I think I would have taken the old one apart and had a look at it before I bought a new one. In saying that, easy fix and also have a spare unit. nice.

[andrewlemoine]

Another thought is engaging the pto at to high rpm the the power would shear the roll pin and not shear pins . Engaging the pto at a low rpm then raising the rpms is like a soft start motor .

[robertdolan]

On my BX2750D Snow blower the second stage propeller won't turn. I have checked for something seizing it and can't find a thing. Any ideas?

[turbotona]

When I rebuilt mine i noticed that my spring pin was starting to break so I replaced it. I’m not sure I would replace that with a hardened pin I would be afraid if it breaking. I went with a double spring pin.

[garym]

That spring pin saved your gears and gear box housing from damage. That worm gear, in an industrial application, would have been keyed to the shaft, but then you would have found massive damage, ask me how I know. Nothing will stop a worm gear from turning if the HP is available. The designers knew enough about the failure of shear pins to fully protect the system and provided a backup protection device. Lucky you. If you are smart, you too will have replaced it with a tight fitting spring pin.

[seansysig]

It can only be a spring pin. As it fails before one damages the gears. Also the spring pin recesses below gear surfaces. It always pays to investigate failure before throwing expensive parts at the problem.

[JamesFeragola]

The Spring Pin on mine has broken 2 times, they should really assemble the box with tougher pins.

[andrewlemoine]

Possible wrong shear pins? If they are too strong they would shear second roll pin first