Toro 20374 pinion gear seized

[trooper1954]

Hi all,
Have a different issue from my mikuni carb.....cannot get the pinion gear off the end of the drive axle on the above mower......copious amounts of Deep Creep penetrant over 3 days, and also heat from a torch to almost red hot.....still won"t come off!!! And in trying to pry it off I've destroyed the plastic washer that sits behind it, so in order to repair both, the pinion gear has to come off!!!
Any other suggestions greatly appreciated.

 

[PCustoms]

Pictures?

 

[DGersic]

Is it pinned? Would a gear puller help?

 

[trooper1954]

Is it pinned? Would a gear puller help?

Gear puller has no purchase, as the back of the pinion gear is bevelled

 

[gizardlizard]

Try a bearing separator. Won’t matter if the back of the gear is beveled.

 

[BillK]

A picture would make it so much easier to help you.

 

[BillK]

If it is like one I fixed for a friend last year there is a retaining ring on the end of the shaft. Did you remove that ?

 

[trooper1954]

Thanks BillK.. yes I removed the retaining clip.
Photos to follow.

 

[BillK]

Thanks BillK.. yes I removed the retaining clip.
Photos to follow.

We ended up holding his in the air by hand and whacking it with a hammer. We turned it on its side and he pulled up on the plate that the drive goes through and I smacked it a few times until it came off. This is probably the third time he has has to fix his but he is cutting lawns as a sideline so it is getting a lot of use.

 

[trooper1954]

Here's the issue

 

[BillK]

Ok, that is totally different than the one I was working on. Depending on how big the gear is a pitman arm puller might work:

Google Search

If a new gear is easily available then you might just have to cut it off. Make a groove down in the valley of one of the teeth and then smack it with a sharp chisel and the gear will split.

 

[gizardlizard]

Again, bearing separator.

 

[gizardlizard]

The pinion could be flush and the bearing separator would still work.

 

[Fixr]

I have seen shafts get mushroomed a bit at the end from removal attempts. That one appears to have hammer marks, so it could be mushroomed.. Sometimes pushing the gear down on the shaft and filing the end of the shaft will allow the gear to be pulled off. And I agree, use a gear separator, plus heat if it's still stubborn.

 

[DGersic]

Or something like this.

 

[trooper1954]

Hi guys.....quick update....
Bearing separator arrived yesterday, and pinion gear is on its way out!! Only problem was the drive screw in the center that actually does the pulling even tho pointy, was a little bit too wide for the rectangular hole in the end of the gear. I think I'll just file it down for now, or look for a bolt with the same thread and file it instead.
One other question....in trying to remove the gear before I got the separator, I destroyed what appears to be either a fibre or plastic washer on the drive shaft on the inside. I've looked at numerous parts diagrams of this transmission system but none show this washer....any ideas what its called and how I would order a new one?
Have included a picture of the other side.
Mower is a Toro 20055 serial # 250008366
Thanks

 

[DGersic]

any ideas what its called and how I would order a new one?

McMaster Carr likely has something. Once you get it off and can measure it, look there. You’ll probably have to buy a ten pack of them.

 

[trooper1954]

DGersic....destroyed it when trying to get the pinion gear off before the puller!!!!!

 

[Wrench97]

Measure the od on the other side and get the ID from the shaft size it sits on.

 

[PCustoms]

One other question....in trying to remove the gear before I got the separator, I destroyed what appears to be either a fibre or plastic washer on the drive shaft on the inside. I've looked at numerous parts diagrams of this transmission system but none show this washer....any ideas what its called and how I would order a new one?
Have included a picture of the other side.
Mower is a Toro 20055 serial # 250008366
Thanks

I don't see a fiber washer:

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[DGersic]

DGersic....destroyed it when trying to get the pinion gear off before the puller!!!!!

The washer ID has to be about the same as the shaft OD. You can measure that. The washer OD is likely not very critical.