Cat 3126 belt tensioner and idler replacement or bearing replacement

[Richard Good]

Has anyone done this repair, either the whole part, or pressed out the bearings and pressed in new ones?

[Fred Brooks]

     Hi Rich,
I did it on my C-12. It is an easy DIY project. After you remove the idler pulley, remove the internal snap ring. Use a 1/2" drive socket that fits the opening and drive the old bearings out. Mic out the diameter and hole size and order from a bearing supply house online. BTW, carry a spare serpentine belt in the event you have a failure. Local parts house will not stock one. Hope this helps, Fred

[Eric Maclean]

Richard
As Fred pointed out the replacement of the idler bearings is pretty straightforward and can even be done with a vise as a press .
You may want to do the bearings in the water pump belt tensioner as well.
The bearing numbers are

Serpentine belt tensioner bearings..................6203-2RSH
Water pump belt tensioner,..............................6202-LLB/C3

Serpentine belt NAPA #:25-080700
Water pump belt NAPA #17345 or CAT #036-6775


Hope this helps
Eric