Cm 870 cry for help

[Waterloo]

Tire wear, if suspension is in good shape, I would high speed balance the steer tires. You are checking for balance and roundness of both tires. Could also be normal wear, take a photo of tread and post.

The abnormal belt wear could be a sign of a failing damper. How many miles on your motor? Cummins recommends repacking at 500,000 miles. I was chewing up belts and losing accessories, I replaced the damper and problems stopped. The damper is the big round disc on the end of the crankshaft, under the fan, it has a viscous fluid internally that hardens over time. When this occurs, the damper, or harmonic balancer, loses its ability to do its intended balancing act.

This is a regular wear item, unfortunately there is no way to inspect, replacement is the only option. If you do not replace, problems will persist, and you risk the damper failing completely, which entails blowing apart. You don’t want to go there.

When I replaced mine, it was $635 at my local Cummins shop. I had them install, as it was that winter that was nonstop -20, I was not replacing that in my driveway, LOL! They charged me two, maybe three hours labor. The bill was $1000 out the door, I dropped off at 1700 picked it up the following day at 0800.

If you replace, the damper must be painted so as not to void the warranty. Use the Cummins red paint, it ain't cheap, just use it, it is meant for the wear and tear of these external parts. One can will be plenty, as it goes a long way. I would also mark the timing stamps in the damper, use a sharpie and spray a clear automotive clear coat over the damper after marking the stampings. When it is time to do an overhead, you will be glad you did just that. Use multiple coats, paint over two or three days, seriously.