489 /8.75....Hammer time?

[jeepthrills01]

Hello all,
Am I correct in assuming something is very wrong if after removing the pinion nut,yoke,seal, and washer that repeated blows from a 4lb sledge to get the pinion gear free of the housing is required?

I picked up a "rebuilt" 489 hog head with 3.73 gears a while back...it didnt feel right to me....especially with almost 40 ft/lb of force required to rotate it. So diving in...my teener needs more than the current 3.23 can provide.

And is this an eliminator or crush sleeve?

 

[khryslerkid]

I'm going to ask a dumb one...is the ring gear carrier and ring gear removed?

Keeping the front pinion bearing seated so it doesn't bounce, it can take some effort.

Hopefully there wasn't severe bearing carnage that would have spun the bearing on the pinion shaft and has it gaulded to it. I've never seen this but nothing is impossible.

 

[jeepthrills01]

Yup.thats dumb..lol....but ive seen some doosies on this forum too.

It felt pressed on

 

[padam]

It doesn't look bad. Maybe just the pinion on the large side and the bearing on the small.

 

[khryslerkid]

The front bearing can be really tight. The last one I did, replacing the new bearing, was really hard to get off and on and I hadn't a good gear pattern yet. I must have taken it apart to add or subtract shims a dozen times. Halfway through the process I actually sanded the pinion a little so the bearing went on a little easier. You still want to be able to drive it on with some resistance but not at the resistance that I was having. Some bearings and or pinion shafts can be a little under or over sized.

Glad to see you got her apart. Good luck with the rebuild.

 

[khryslerkid]

Almost forgot...

This is the crush sleeve eliminator that Dr Diff carries. Looks a lot heavier than the one you're showing. But yours could be one.

https://www.doctordiff.com/8-3-4-489-case-crush-sleeve-eliminator.html

This is a standard crush sleeve that has the ring around it that does the collapsing. The one you're showing doesn't have this ring.

https://www.doctordiff.com/8-3-4-minimum-installation-kit.html

Did you find shims between it and the bearing? That would tell you it is for sure.

 

[493 Mike]

Hello all,
Am I correct in assuming something is very wrong if after removing the pinion nut,yoke,seal, and washer that repeated blows from a 4lb sledge to get the pinion gear free of the housing is required?

I picked up a "rebuilt" 489 hog head with 3.73 gears a while back...it didnt feel right to me....especially with almost 40 ft/lb of force required to rotate it. So diving in...my teener needs more than the current 3.23 can provide.

And is this an eliminator or crush sleeve?

View attachment 1176071

If a puller is needed to remove the yoke from the pinion-use one. Do not beat up the rear pinion bearing with a BFH. And yes 40 ft./lbs. is a ridiculous amount of torque to rotate the pinion. Should be more like 25 IN/LBS.
Mike

 

[khryslerkid]

If a puller is needed to remove the yoke from the pinion-use one. Do not beat up the rear pinion bearing with a BFH. And yes 40 ft./lbs. is a ridiculous amount of torque to rotate the pinion. Should be more like 25 IN/LBS.
Mike

Without the carrier installed.

 

[jeepthrills01]

Even with the ring gear removed...it was ridiculously tight.

It appears there are no shims under the large bearing.

Guess ill press the large one off...and trim it up to be a "set up bearing"..order a new eliminator, full set of bearings and install kit....no wonder he gave it up for 600 bucks.

 

[493 Mike]

Even with the ring gear removed...it was ridiculously tight.

It appears there are no shims under the large bearing.

Guess ill press the large one off...and trim it up to be a "set up bearing"..order a new eliminator, full set of bearings and install kit....no wonder he gave it up for 600 bucks.

No pinion shim is wrong! The pinion depth must be set properly or it will self destruct if used with incorrect gear mesh.
Mike

 

[padam]

It's probably an eliminator, but installed incorrectly without shims, as if it were a crush sleeve.

 

[493 Mike]

It's probably an eliminator, but installed incorrectly without shims, as if it were a crush sleeve.

See post #9
"It appears there are no shims under the large bearing."
Mike

 

[RemCharger]

2 wrongs don't make a right lol.
Sounds like no shims under pinion bearing AND, no shims for spacer!

See post #9
"It appears there are no shims under the large bearing."
Mike

 

[padam]

Need ya one of these...

 

[jeepthrills01]

If a puller is needed to remove the yoke from the pinion-use one. Do not beat up the rear pinion bearing with a BFH. And yes 40 ft./lbs. is a ridiculous amount of torque to rotate the pinion. Should be more like 25 IN/LBS.
Mike

Yes..a Jaw puller was used on the yoke.
And before the pinion got its beating, the seal was removed, pinion nut was screwed down hand tight...leaving the top of the pinion threads safe below the top 2 threads of the nut. The socket was placed over the nut to maximize the impact...and it was beaten to within an inch of its life till the bearing gave up its grip on the pinion shaft...(kinda like a girl i know in Wichita)..lol...js.