Transfer Case Rear Output Preload
Posted: Sun Jan 09, 2022 12:38 pm
I am to the point on my truck of replacing seals on the Transfer Case. Awhile ago I bought a set of bearings for the TCase from DC Trucks in Oregon.
Opening up my TCase it looks really good inside so I had planned on not changing the bearings. In putting it back together I got to looking at the rear output bearings and the race had these strange colored spots in the metal. I could not feel anything rough but it just looks like the bearings go really hot. So I decided to use the race and roller bearings I got from DC Trucks. The bearing and race numbers match.
I removed the races and the large cone from the gear and shaft. Pressed on a new large bearing and assembled it back together with the original shims to check the preload.
It didn't have enough preload. So, I took it apart and removed some shims. Still not enough preload. I kept removing shims until I got down to none, only the spacer was left. Still I can only get up to about 50 inch pounds of resistance when torqued down. I should be getting at least 180 - 360 inch pounds = 15 - 30 foot pounds.
I can pick the assembly up and tilt it back and forth and hear the spacer sliding back and fort between the large and small bearings.
What am I missing here? To me with no shims the assembly when torqued down should not be able to turn.
Opening up my TCase it looks really good inside so I had planned on not changing the bearings. In putting it back together I got to looking at the rear output bearings and the race had these strange colored spots in the metal. I could not feel anything rough but it just looks like the bearings go really hot. So I decided to use the race and roller bearings I got from DC Trucks. The bearing and race numbers match.
I removed the races and the large cone from the gear and shaft. Pressed on a new large bearing and assembled it back together with the original shims to check the preload.
It didn't have enough preload. So, I took it apart and removed some shims. Still not enough preload. I kept removing shims until I got down to none, only the spacer was left. Still I can only get up to about 50 inch pounds of resistance when torqued down. I should be getting at least 180 - 360 inch pounds = 15 - 30 foot pounds.
I can pick the assembly up and tilt it back and forth and hear the spacer sliding back and fort between the large and small bearings.
What am I missing here? To me with no shims the assembly when torqued down should not be able to turn.