'50 "Twin" Cub

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Dale Finch
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Zip Code: 27517
Tractors Owned: '55 Cub "Bertha"
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Location: NC, Chapel Hill

Re: '50 "Twin" Cub

Postby Dale Finch » Sat May 23, 2020 9:07 pm

Consensus was to gap the Prestolite Distributor to .020, so I did. it was quite clean inside, so all I had done was dress the points, put a dab of dialectric grease on the cam, and oil the felt in the dust cover. I lightly filed the rotor, then cleaned the better of 2 distributor caps. Since the engine was still on TDC, I turned the rotor to the 1 O'clock position, and installed the distributor.
20200520_131842 (Small).jpg

20200520_133934 (Small).jpg

I filled the radiator with 50/50 antifreeze.
When I was greasing all the zerk fittings, I found a small pinhole in the top front of the left steering knuckle post, right at the weld. It looks like the original weld, not a repair, so I don't know how long it's been like that. I only noticed it because a small snake of grease came out.
20200520_160241 (Small).jpg

I think I will leave it for now, as it does not appear to be a crack...I wire brushed the area to try to confirm that.
Note: the blob of grease, on the left in the photo, was from the bad zerk fitting on the back side, which was replaced. The short length of grease in the center right is the pinhole.
20200520_161313 (Small).jpg

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Dale Finch
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Posts: 4549
Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '55 Cub "Bertha"
'55 Cub "Ben"
'56 Cub "Boris"
Circle of Safety: Y
Location: NC, Chapel Hill

Re: '50 "Twin" Cub

Postby Dale Finch » Sat May 23, 2020 9:53 pm

Although I have a spare PTO ready to bolt on, I decided to check this one out. So I disassembled it, and when I removed the grease shield, I couldn't see either staking or a retainer clip. That's when I noticed the shaft was shifted about 1/16-1/8" toward the rear.

20200522_113407_001 (Small).jpg
Note the small gap just to the left of the bearing

Since this is, so far, a non-runner, I have never seen if the PTO engages well. This movement MIGHT be enough to allow the PTO clutch to grind. In any case, I examined the shifter pin for wear, and it appears OK...lucky!

When I pushed the bearing all the way back, I could then see the completely worn stakes. This is a common cause of the PTO popping out of gear or grinding. It also causes the pin on the PTO shifter to wear, which exacerbates the problem.
20200522_114039 (Small).jpg
The stakes are completely worn down allowing the bearing to move forward = shaft movement to the rear

Since I have a spare as a backup, and pulling the PTO is an easy job, I decided to re-stake the shaft. I had tried once before on another tractor, but it eventually failed, and I ended up replacing the shaft with the newer one that has a retainer clip for the bearing. Since the shaft has a slightly sloped shoulder right where the staking is done, I found it very difficult to get a bite into the steel. But eventually I got 3 new ones done, and we will see if it holds.
20200522_115559 (Small).jpg
Center is the old worn stake, new ones are left and right of it

With the retainer primed and having a new seal, I was ready to reassemble the PTO. I replaced the old loose/rotating grease fitting with a new one.
20200522_185242 (Small).jpg
Ready to reassemble

NOTE: This is a PUSH IN type grease fitting, not a typical screw in.
20200522_172257 (Small).jpg
A PUSH-IN type zerk fitting (AKA DRIVE-IN type)

20200523_172436 (Small).jpg

brewzalot
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Re: '50 "Twin" Cub

Postby brewzalot » Sun May 24, 2020 7:15 am

Dale Finch wrote:It looks like the original weld, not a repair,


There is some porosity in that weld... I would say that is a repair but hard to tell for sure from photos. It appears however the strength of the weld should be fine. If snakes bother you, you could try some JB weld on the hole :)

tim

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Stanton
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Tractors Owned: 1942 Farmall AV, serial #87025
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Location: Lone Jack, MO

Re: '50 "Twin" Cub

Postby Stanton » Sun May 24, 2020 7:26 am

Agree with Tim. Clean really well and put a little JBWeld in there.

The PTO is looking good!
Stanton
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Dale Finch
10+ Years
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Posts: 4549
Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '55 Cub "Bertha"
'55 Cub "Ben"
'56 Cub "Boris"
Circle of Safety: Y
Location: NC, Chapel Hill

Re: '50 "Twin" Cub

Postby Dale Finch » Sun May 24, 2020 7:29 am

That might be a good idea...at least it would keep the area cleaner! I will also keep an eye on it, just to make sure it ISN'T a crack.

User avatar
Dale Finch
10+ Years
10+ Years
Posts: 4549
Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '55 Cub "Bertha"
'55 Cub "Ben"
'56 Cub "Boris"
Circle of Safety: Y
Location: NC, Chapel Hill

Re: '50 "Twin" Cub

Postby Dale Finch » Sun May 24, 2020 11:54 am

I replaced the clutch pedal spring with a new one from TM Tractors. Went on the easiest I have ever tried! Shear luck, no doubt! :lol:
Although I did order 3, 2 for the brake pedals, those springs looked OK, so decided to put the extra 2 in the parts drawer for future "emergencies".
20200522_174638 (Small).jpg

While under the platform, I noticed the Left Brake Pedal had some play in it. I removed the set screw and jam nut, and saw that the screw had backed out quite a bit. I cleaned it up, and reinstalled, making sure it seated well, then tightened the jam nut good and tight...I hope! Right brake was fine.
20200522_175310 (Small).jpg
Note position of the jam nut on left brake set screw

20200522_180239 (Small).jpg

20200522_180741 (Small).jpg
Compare the location of the jam nut to the previous photo of it


NOTE: This is a fairly good example of what happens if you do not check the various set screws and implement mounting bolts on these tractors. They CAN come loose, and in doing so can cause some damage. So next time you get a chance, check those spindle steering arms, and make sure the set screw is tight. And as has often been pointed out, all the rear wheel bolts, and any of those tapered implement bolts...otherwise you will be helicoiling those finals!!

User avatar
Dale Finch
10+ Years
10+ Years
Posts: 4549
Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '55 Cub "Bertha"
'55 Cub "Ben"
'56 Cub "Boris"
Circle of Safety: Y
Location: NC, Chapel Hill

Re: '50 "Twin" Cub

Postby Dale Finch » Sun May 24, 2020 7:46 pm

Removed the ground cable from the transmission cover bolt, along with the PTO shifter, to allow cleaning and priming, but leaving the ground connection bare and shiny.
Using new gaskets and lockwashers, I installed the PTO assembly. Once installed, I noticed the new seal was barely on the machined part of the PTO shaft. Since it is a thinner seal than the original, I simply drove it further in (forward) until the lip was riding where it should be.
20200524_150629 (Small).jpg
Seal was riding just at the top of the tapered section of the shaft

20200524_151109 (Small).jpg
Drove the seal in about 1/8" more, and lip of seal is now on the machined section

Now with the PTO installed and the drain plug in place, I added about 3 1/2 PINTS of gear oil, until it started coming out the Level Plug hole.

Time to check and grease the Throw-out Bearing. It is in surprisingly good condition, in fact it looks new. The clutch fingers appear to be in good shape, and though the gap between the TOB and the fingers is a wee bit more than 1/8", I decided to leave it until it is running and tested.
20200524_165601 (Small).jpg

Finished the night by painting the seat parts after cleaning, but I am waiting for the seat spring to assemble it.
20200524_175801_001 (Small).jpg


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