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Cracked Power King bull gear.


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#1 classic ONLINE  

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Posted February 01, 2016 - 07:51 PM

I disassembled most of the rear end on the old '56 PK that I picked up a couple of years ago. This tractor is a complete basket case and just about everything is worn out. The rear end gears actually looked very good until I cleaned one of the bull gears. I noticed a hairline crack extending from the keyway slot outward. I immediately checked the other gear and it had no cracks, but the gear was slightly different. Both gears have a boss above the keyway slot, but the boss is smaller on the cracked gear than the boss on the good gear. The bosses are in different locations in relation to the lightening holes in the gear. I'm guessing that the good gear was a design improvement and may have been changed out in my tractor at some point in the past. Luckily, I was able to find a replacement gear with the larger boss to replace the cracked gear. The replacement gear was on sale through Joe's for 37.99 shipped, so it wasn't too bad. I'm replacing the axle and pinion bearings, axle and pinion seals, gaskets, brake hubs, and new brake bands. I was originally just going to clean up and paint the rear end, but good thing I tore it apart and found the cracked gear. I can see it now, nice shiny new paint and BANG! "What the #@%$ was that?" Here are two pics of the cracked gear and two pics of the replacement gear.

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#2 petrj6 ONLINE  

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Posted February 01, 2016 - 08:30 PM

      Good you found the crack and found a replacement so fast, make you feel any better I went and snapped the low idle jet out of the tillotson carb tonight!! now I need to replace that. 

                                   Pete


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#3 classic ONLINE  

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Posted February 01, 2016 - 08:42 PM

Well that's a drag, Pete. I've never needed to look for Tillotson parts, so I don't even know where to look. I knew there would be set backs with this old heap, but that's alright. I saw potential when I looked in the sellers shed the day I bought it, HA! This is what I saw...

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#4 Gtractor ONLINE  

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Posted February 01, 2016 - 11:37 PM

That crack hasn't gotten any worse since 1965.   :poke:


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#5 classic ONLINE  

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Posted February 02, 2016 - 01:43 AM

When I wet to pick the tractor up, it looked like it wasn't moved since 1965, HA! I rebuilt the tranny, honed the replacement block to .020, (original engine was shot), the frame is stripped down, and I'm rebuilding the steering column and front end. I've been rounding up parts for the best deals possible since I picked it up. I really didn't want to sink much into it, since I'm working on other projects. At least it will be reliable, and I plan on using it a lot around the place.

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#6 EconChuck OFFLINE  

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Posted February 09, 2016 - 09:37 AM

Good work. It looks like the keyway/key had worn to where the key was rotating/turning and instead of being in a shear condition which is what it should of been, to where it was putting outward pressure which broke the casting.

I will be into a couple of '50's Economy's this year and will take a close look at this area.

Chuck


Edited by EconChuck, February 09, 2016 - 09:39 AM.

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#7 classic ONLINE  

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Posted February 09, 2016 - 12:30 PM

Thanks Chuck. Take a look at the center section of your Ford model A banjo rear end. I found a crack in mine, so I'm replacing the center section. These are the early Model A housings from 1928-1931. There were three different types used during these years, but they interchange. Improvements were made in the casting to strengthen them. I have the shim gasket kit coming so I can set the preload on the carrier bearings and adjust the ring and pinion backlash. I will have to set the preload on the pinion bearings, also. It will be a bit tedious, but I read a good deal about setting up the rear end correctly. There are a few good write ups out there on setting up Model A Ford rears. My carrier and pinion races are in great shape, so they will be reused. All of the axle needle bearings, races, and oil seals are getting replaced. I'm just waiting on some parts to come it to get started, and I'll post the whole process here, along with bearing and seal part numbers. I removed all of the bearings, seals, and races, from the axles and housings already. I made up a puller out of threaded rod and an old tapered roller bearing to draw the pinion race from the banjo. The pinion race will go in the freezer, and I will slightly heat the banjo housing when I install the race in the replacement banjo.
If you find any cracked bull gears in your 50's PK's, replace the bull gears from a later PK with the tall boss above the key way slot. These are stronger in this area. I'm looking forward building up this Model A rear, since I haven't put one together yet. The gear ratio on this rear is 4.11.

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Edited by classic, February 09, 2016 - 12:33 PM.





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