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Old 09-10-2019, 09:43 PM
JBFab JBFab is offline
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Default New Holland TN70A - front axle fun

My good friend and neighbor across the section called and said one of his front tires was locked up on his tractor. I went over to help tear it down and drink his beer . After a bit of surgery we finally got it apart.

Picture 1 - a break down of the left side axle/knuckle assembly.

Picture 2 - a further breakdown of the cap and planet gear assembly from picture 1.

Picture 3 - the good (RH) side - disassembled this side because we couldn't get the bad (LH) cap off.

Picture 4 - the left hand side cap and planet gear assembly. Note the extra groove worn in the center from all the extra parts rattling around inside.

Picture 5 the outer end of the bad (LH) shaft.

To get the damn thing apart, we removed the entire knuckle assembly splitting it at the CV joint. Next we mounted it in my drill press with a hole saw and cut an access hole in the center of the cap. This gave us access to confirm what we thought all along. The splines of the axle that stuck through the planet gears had a burr on them that wouldn't allow the shaft (sun gear in this case) to slide out of the planet gears (even with a fair amount of force applied). Finally, with a second, smaller hole saw I cut the teeth that were protruding through the planets and pulled the shaft free.

I did a little bit of googling, and I'm going to estimate a good $1500 or so in parts to get this back together. I called a scrapper in OR about getting a used assembly and he wanted $1500 plus shipping for the assembly. Doesn't sound like much of a deal. The castings are in good shape, the shaft and planets are shot, the cap could be made to work, but it's only $200 - not hardly worth messing with. I think the ring gear is fine (weird) but if it's not more than a couple hundred I told him we may as well replace it too.

Tractor will be for sale in a few years if anyone is interested! lol.
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Last edited by JBFab; 09-10-2019 at 09:58 PM.
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Old 09-11-2019, 01:20 AM
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Shade Tree Welder Shade Tree Welder is offline
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Looks like lack of lubrication my NH front axle has an oil bath...
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Old 09-11-2019, 05:56 AM
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Quote:
Originally Posted by Shade Tree Welder View Post
Looks like lack of lubrication my NH front axle has an oil bath...
Yup, over at agriculture.com there used to be a ford mechanic, and he
told of how farmers having leaks in the planetary, would ignore it.

"It leaked a little, then stopped again"

He explained how it's only got maybe a quart in there when full.....
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Old 09-11-2019, 07:15 AM
JBFab JBFab is offline
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Yes, they are in an oil bath. We did drain some oil out of both sides, whether or not it was to the proper amount I couldn't tell you. Both sides were relatively clean aside from the shiny bits in the left side .
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Old 09-11-2019, 07:16 AM
JBFab JBFab is offline
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Quote:
Originally Posted by digger doug View Post
Yup, over at agriculture.com there used to be a ford mechanic, and he
told of how farmers having leaks in the planetary, would ignore it.

"It leaked a little, then stopped again"

He explained how it's only got maybe a quart in there when full.....
Yep, that sounds about right . . . lol.
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Old 09-11-2019, 12:23 PM
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Dr Dean Dr Dean is offline
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Every time I hear a customer say that they will keep adding oil so they can get something done it usually takes the swivel housing and everything on out. It's amazing to me how people can be their own worst enemy.
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Old 09-11-2019, 12:50 PM
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Shade Tree Welder Shade Tree Welder is offline
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I have a very very slight leak in my front axle, I believe it to be the o-ring
at the swivel. I have a TC40DA, with the super steer front axle.

I only add an ounce or 2 a year. But I am keeping an eye on it. When I
have some time to tear down the front axle I will sort it out. I am sure
just a seal or 2 will solve the issue.
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Old 09-11-2019, 06:12 PM
JBFab JBFab is offline
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Quote:
Originally Posted by Shade Tree Welder View Post
I have a very very slight leak in my front axle, I believe it to be the o-ring
at the swivel. I have a TC40DA, with the super steer front axle.

I only add an ounce or 2 a year. But I am keeping an eye on it. When I
have some time to tear down the front axle I will sort it out. I am sure
just a seal or 2 will solve the issue.
How often have you had to replace the bearings at the knuckle? This thing seems to eat them every 2-3 years.
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Old 09-11-2019, 07:29 PM
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MetalWolf MetalWolf is offline
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Quote:
Originally Posted by JBFab View Post
How often have you had to replace the bearings at the knuckle? This thing seems to eat them every 2-3 years.
Do you use it constantly in 4WD or only when it's needed? or is it full-time 4WD I'm not familiar with this machine...
as Ron mentioned it does look like its been run dry aswell like its having some lubrication issues.
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Old 09-11-2019, 11:10 PM
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Quote:
Originally Posted by JBFab View Post
How often have you had to replace the bearings at the knuckle? This thing seems to eat them every 2-3 years.
Never, bought it new in 2007
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