breaking down all my hubs on the 4106..

Darkspeed · July 13, 2015, 11:18:39 AM

Waiting on parts from the all mighty Luke...

After removing one hub and finding unlimited shenanigans I decided to do the other three.

Both front hubs had all Lefty studs ... hmmm.. glad im replacing them with longer L & R studs for aluminum wheels

Darkspeed · July 13, 2015, 12:46:08 PM

Arggg... I guess the last owner/ mechanic assumed that the rear bearings run on diff oil...

No signs of Grease and marks on the shaft where the bearings had done a little spinning.

Bearings look ok at first glance.

S-Cam has some ware as expected.

S-Cam bushings are worn out allowing for almost 1/8 off axis "rocking".

Brake shoes look new

Some chisel must have been angry at that nut!

eagle19952 · July 13, 2015, 01:52:07 PM

Chisel wounds.... just shows it's been often maintained... by the same person

Darkspeed · July 13, 2015, 02:12:06 PM

Quote from: eagle19952 on July 13, 2015, 01:52:07 PM
Chisel wounds.... just shows it's been often maintained... by the same person

Or the lack of grease burned that nut on.. lol..

Tom Y · July 13, 2015, 03:41:20 PM

They do not run in oil?

??

chessie4905 · July 13, 2015, 04:17:55 PM

They can run in oil or with proper seals, hubs run in grease. Many people use a punch or chisel to tighten/loosen nuts. Best is proper socket and torque wrench.

Beesme · July 13, 2015, 04:21:42 PM

Yes my 4106 rear bearings run in gear oil . Just rebuilt rear ended 2 yrs ago .

Darkspeed · July 13, 2015, 04:27:11 PM

Quote from: loveshack on July 13, 2015, 04:21:42 PM
Yes my 4106 rear bearings run in gear oil . Just rebuilt rear ended 2 yrs ago .

The should not! They run in Grease! as per all of the specs

The rear seals isolate the grease area from the diff oil area - they are not supposed to mix

johns4104 · July 13, 2015, 05:29:05 PM

Lot of guys switch the seals out to run on axle oil. My 4104 is that way.
Hey a couple less bearings to grease!

Good luck

Darkspeed · July 13, 2015, 05:51:40 PM

Quote from: johns4104 on July 13, 2015, 05:29:05 PM
Lot of guys switch the seals out to run on axle oil. My 4104 is that way.
Hey a couple less bearings to grease!

Good luck

are you talking about the front or the rear?

I know you can do that in the front. Can you do that in the rear??

Darkspeed · July 13, 2015, 05:58:16 PM

Passenger side rear was filled with grease and not oil, it was also filled with water and rust... and crusty bearings..

Races are shot as well. How bad are the races to change out?

Darkspeed · July 13, 2015, 06:06:57 PM

There was also an issue with the passenger side brake and drum.

It looks like someone replaced the pads without fixing the groove in the drum and now the pad matches the drum.

Do I need a new drum / pads?

OneLapper · July 13, 2015, 07:03:51 PM

Todd,

My 4106 has oil bath rear bearings as well.

Mark

eagle19952 · July 13, 2015, 07:15:47 PM

some would run them... but I believe..they are beyond acceptable wear. .060 if I recall correctly.

And That would be both sides in my opinion...

Would u sell it that way ?

Darkspeed · July 13, 2015, 07:55:03 PM

Quote from: OneLapper on July 13, 2015, 07:03:51 PM
Todd,

My 4106 has oil bath rear bearings as well.

Mark

Mark what did you change to use oil bath rear bearings? The OEM seals are designed to prevent oil from entering the bearing housing. Where /how do you fill the rear bearing housing?

QuoteThe GMC coaches rear axle lubercant fill plug is lower than the axle tubes.
GMC Coach maintenance manual states that.
The inter and outer bearings on the rear hubs MUST be packed with with wheel bearing grease.
Don't try to run the coach unless you pack these wheel bearings with grease.