Volvo air & suspension problems

Good, you have less things that can go wrong, and 630 is shorter lighter cab, less presure on cab suspension . As was mentioned above, perhaps cab mont bushings
This square cab torq rod bushing also doesnt last long on my heavier 780, max one year but is cheap easy to replace myself. I would consider replacing it if old , cracked or still the original.When the ruber get cracked like this , (inside pr ouside ) is done, wont hold the cab on the middle. Another problem i experienced was bad cab air springs, leaking, especially around the air supply line , the fitting take a spray bottle with water soap and check it.
I also experienced the cab suspension beam lose from cab, right side, the weld snapped, it's spot welded not very solid. .

 

When the rear of cab is shifted to the left or the right that's a sure sign the cab bushings are worn out.

The cab bushings are located right before the firewall right above the frame rail.

You will need to remove the side skirts and front inner fender splash panels to access and R&R the cab bushing brackets.

On a DPF Volvo you may need to remove the burner and filter assembly in order to access the passenger side bracket and bushing.

Once you remove the cab bushing bracket, the old bushing will need to be pressed out and the new one pressed in.

I believe there is a YouTube video on R&R the cab bushings.

The governor should have a plastic dust cap over the adjustment screw, remove the cover and turning the screw counterclockwise will raise the cutoff.

There are YouTube videos on adjusting the governor too.

 

I must have a good one. Shows air suspension and each tire pressure and wheel temp.

 

The cab bushings don't get blocked by the DPF, so it's the same process to remove them either way. It is super tight trying to get a wrench on the inside of the frame, though.

 

Do your cab bushings. It makes a very noticeable in ride quality

 

Hii I have volvo 2013 there is issue with air bags that are not going up I tried to took off the levelling valve rod nothing happened any suggestion.
Thanks

 

Is airbags completely deflated?

 

Thank you for this update. My 2016 feels like it's bottoming out so I thought it needed some cab shocks. When I got to looking at it, I noticed the cab leaning over to one side. Nothing appears cracked or broken but it rides horrible.

How easy are these to change? Something I can do in my home shop? I have a cherry picker, floor jack, bottle jack and a hydraulic ram kit. How do you support the cab while they are changed?