Severe Vibration at Low RPM on 2020 Cascadia DD15 – Need Help

Hi everyone,

I’m driving a 2020 Freightliner Cascadia with a DD15 engine and currently at 545,000 miles.

I’ve been dealing with a serious vibration issue that happens only at low RPMs. Here are the symptoms: • Right after a gear shift, the truck starts vibrating heavily until it passes around 1200 RPM. • If I apply more throttle and push it past that RPM, the vibration decreases noticeably. • The vibration is also very bad when the truck is in neutral —

Here’s what I’ve already done: • Replaced all tires •. Valve adjustment •. DPF Filters replaced • Completed a full alignment • Replaced kingpins • Replaced driveshaft • Inspected and replaced all related driveline components

Everything on the chassis and drive side has been checked and is in good shape. But the vibration still persists, and it’s becoming more and more frustrating.

Has anyone experienced this same issue with a DD15?

Any advice or shared experiences would be really appreciated.

Thanks in advance

 

Replace the dampener.

 

Did you have the same issue?

 

Does the vibration go away when you push in the clutch?

 

Yes

 

Does the vibration happen right away after starting the cold engine, or after it warms up?

 

Sometimes doesn’t start with the cold engine. It starts after warms up. But sometimes it makes with cold engine too

 

Ding, ding, ding!

 

So engine mounts or crank dampener?

Once clutch is depressed and separates engine from driveline -

He said driveline was replaced/checked - I was thinking carrier bearings.

 

The problem is in the clutch itself. Most likely broken spring on the clutch plates.