Proper height for the front drive axle on a tandem truck is usually 7.75 to 8 inches (from the weld seam in the middle of the drive axle to the bottom of the frame rail). The Volvo recommended method of measurement is:ġ) Take a measure of the height of the tire (X)Ģ) Measure the distance from the ground to the bottom of frame (Y)ģ) Subtract half of tire height (X/2) from the distance of the ground to the bottom of the frame (Y):Ĥ) The result (Z) is the desired distance from the center of the drive axle (usually a welding line) to the bottom of the frame. To fine tune the height, rotate the valve (remove the nut on the valve, rotate the attachment between the rod and valve, reinstall the nut). These holes are there for large adjustments. The rear height adjustment is set by 5 holes in the beam under the air bags (there should be 2 on top, 1 in the middle, and 2 on the bottom).
#Bendix abs code sid: 2 fmi: 2 how to
This is how to set the ride height on a Volvo 770, which I would expect to be the same as a 780: On edit, am I correct in guessing that I make the new link the same as the old link? I found this link by doing a goggle search on "MID 136 SID 69 FMI 2 " It would seem like there must be some adjustment to maintain the proper ride height for u-joint alignment.
My next question is, what is involved in replacing the link. but it seems like the end joints should not be that loose. I looked at my leveling valve link and the bottom end has about 1/8 to 1/4 inch play. I have a 2008 Volvo 780 and the computer is throwing the same code (MID 136 SID 69 FMI 2 ). I guess the brake computer was right.the signal was erratic, but may have been caused by a mechanical issue. My plan is to eliminate the play, and give it another try on the road.before I get a new link. Did another visual inspection of the leveling valve link.there is some play where it attaches to the axle.
#Bendix abs code sid: 2 fmi: 2 update
Update - I mentioned the rear air bag pressure on the display varies in a 3 or 4 psi window, going down the road.