Front axle slop? - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 25 Old 05-14-2019, 10:12 PM Thread Starter
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Originally Posted by ZMANN View Post
just FYI you can pull a 4x4 auto hub off and drive without issue it is not responsible for supporting the stub shaft in any way
If this is true then it would make sense that the shaft wobbles around in the hub. A ball bearing is not designed to support any load other than perpendicular to the bore. I have never before seen a floating shaft that didn't have 2 points of support. Maybe that is why it has the large 2 piece seal, to help support and center the axle?
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post #12 of 25 Old 05-15-2019, 05:07 AM
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like a driveshaft it has a fixed point at each end

the replacable sealed bearing inside the unit bearing and the attachment point inside the axle carrier bearing . the unitized vacuum seal is not a support
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post #13 of 25 Old 05-15-2019, 06:48 AM Thread Starter
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Originally Posted by ZMANN View Post
like a driveshaft it has a fixed point at each end

the replacable sealed bearing inside the unit bearing and the attachment point inside the axle carrier bearing . the unitized vacuum seal is not a support
I don't really want to argue, but I appreciate your response. Either the hub supports the axle, or it is a bad design. As far as the drive line example, it is similar to a 2 piece driveline without a carrier bearing. A shaft system needs 1 more support than the number of shafts. The 2 piece axle would need 3 supports points to be properly supported.
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post #14 of 25 Old 05-16-2019, 05:23 AM
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The axle shaft is held in three positions, differential gear - bearing on stub end - locking hub
I agree it is a weak design, but that is what we have to work with -- if you what to get rid of the slack, then gonna need to pull the hub apart and see what is worn -- axle to support bearing or/and hub

There is only a short distance between supports on the stub, so only a little wear will seem like a lot at the u-joint -- how much before the seal fails is the question

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For all those wanting a premium silicone sealer Kubota 70000-73764 is the best your gonna find. This is a hybrid gray silicone that uses solvent rather than acid to start the curing reaction, this makes it safe for aluminum and and any surface that involves coolant.
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post #15 of 25 Old 05-16-2019, 06:39 AM Thread Starter
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Originally Posted by Hydro View Post
The axle shaft is held in three positions, differential gear - bearing on stub end - locking hub
I agree it is a weak design, but that is what we have to work with -- if you what to get rid of the slack, then gonna need to pull the hub apart and see what is worn -- axle to support bearing or/and hub

There is only a short distance between supports on the stub, so only a little wear will seem like a lot at the u-joint -- how much before the seal fails is the question
This seems much more likely to be correct. The sealed bearing has no play in it, so the problem must be the locking hub. A new hub should arrive Saturday
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post #16 of 25 Old 05-31-2019, 06:56 AM
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Originally Posted by Mcflyfyter View Post
That appears to be an upgraded seal, and looks nothing like the remains I have. I was also very surprised how much force it took to dislodge that seal, I had to kick a 3' bar.
Correct... that is the upgraded seal. Or National 710701
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post #17 of 25 Old 05-31-2019, 06:03 PM Thread Starter
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I just received the new sealed bearings, and they no tighter than what is in the hubs now. There isn't anything else to replace, so I guess I'll toss it back together and see what happens.
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post #18 of 25 Old 06-01-2019, 06:08 AM Thread Starter
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I guess I forgot to post that the new locking hub took a little slop out, but not much. I'm willing to bet that this slop is normal, it's just not noticed with a good seal installed.
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post #19 of 25 Old 06-01-2019, 07:24 AM
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How well does the stub axle fit the bearing? -- the seal should not be a point of support -- the stub end of the axle would be supported by the hub and ball bearing -- this is a pretty short distance so only a little clearance could show as slop at the u-joint

Just trying to get the picture straight in my head, I have not had one of these hub setups down in a long time -- What I work on are a lot heavier units and have planetary drives in the hubs, outboard bearings on the long axle, double u-joints, and often only a single bushing on the stub shaft -- quite a different setup

In my defense, I was unsupervised
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General note:
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post #20 of 25 Old 06-01-2019, 07:43 AM Thread Starter
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The bearing is not a press fit, so there is some play. Without having specs it's really hard to tell much of anything. I spent $100 on bearings, and they are much looser than what is in the hubs now. The bearings are nice and smooth, so it would be hard to believe the axle would spin in the race, and the axle and inner race show no sign of wear.
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