NAPA carries the bearing, cheap to. The pulley is steel, not plastic (like the stock tensioner). Just use a small press, and make sure you press the new one straight, or it'll wobble.

 

I took the pulley off tonight and took a look at it.
The bearing is a NTN brand with part number 6203LAX30.
It's a 6203 size and the LAX30 depict seals, etc.

McMaster Carr has a suitable replacement 6203 with double seals, an acceptable temperature, load, and rpm range. Part number 5972k44, cost is $5.34 McMaster-Carr
A little more attractive than Chryslers $245.00 for the bearing 4429639.

If you want an overkill bearing get the stainless steel 6153K77 from McMaster for $36.38 I can handle -40° to 300°F and 17000 rpm.

 

The pulley (with bearing) is only $35 from Cummins...

 

I have not found a source to purchase direct from Cummins. Can you supply contact information?

 

Deductible on a warranty ? Never heard of that

 

While there is no deductible on the 3/36, the 5/100 has a $100 deductible...

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Any Cummins dealer can get you that part...if your looking online, then I can't help you.

 

Ive already put 2 on my truck and only have 130k. . I get all my cummins parts at the local peterbuilt dealer.