There's a small hole in the leveling valve arm. Loose the nuts for the leveling valve mount, take a Golf tee, stick it in that hole. There's a matching hole on the leveling valve itself... when that tee lines up with that hole, you've got it calibrated. Leave the golf tee in place and secure the leveling valve.
there is no way to adjust the ride height other then aftermarket suspension parts
To adjust the Peterbilt Air Trac suspension, first, ensure the vehicle is safely parked and on level ground. Use the air control system to adjust the air pressure in the air bags until they reach the desired ride height, which can generally be found in the vehicle's specifications. Additionally, check for any leaks or issues with the air lines and bags to ensure optimal performance. Always refer to the specific service manual for detailed instructions and specifications related to your model.
Peterbilt made (and continues to make) a number of different models available for a number of different purposes. They won't all have the same suspension. Construction vehicles would have the option of Camel Back, Hendrickson Walking Beam, or Chalmers Suspensions. Road tractors would most likely have a four bag air ride suspension.
No you can not, at least not with the original or OEM suspension.
To lower a Peterbilt 359, you can adjust the air suspension system by releasing air from the air bags, which will lower the truck's height. Additionally, you might consider installing lowering blocks on the rear suspension or using shorter springs, though this could affect ride quality and handling. Always ensure that any modifications comply with local regulations and maintain safety standards. It's also advisable to consult with a professional mechanic for proper installation and adjustments.
Peterbilt Flex Air Suspension is an advanced air suspension system designed for heavy-duty trucks, particularly those manufactured by Peterbilt. This system enhances ride quality and stability by utilizing air bags and shock absorbers to effectively manage load distribution and absorb road shocks. It allows for improved cargo handling and a smoother driving experience, especially under varying load conditions. The Flex Air Suspension is particularly beneficial for long-haul trucking, where comfort and vehicle control are crucial.
I am pretty sure the dealer can do it or you can but a NGS scan tool or something similar.
The bike suspension lockout feature enhances performance and comfort by allowing the rider to adjust the suspension to be stiffer or locked, which improves efficiency on smooth surfaces and reduces energy loss, resulting in a smoother and more controlled ride.
There are two bolts holding the leveling valve in place, with the one on the bottom being more oval shaped...rotate the leveling valve counterclockwise to raise it, and clockwise to lower it. To calibrate it, you'll notice a small hole in the leveling valve arm, behind the hole for the bolt. You take a golf tee, stick it in there, and adjust it until it lines up with the matching hole in the leveling valve itself.
There's a suspension valve towards the rear of the frame... there's a little room to tilt it so that you can raise or lower the air suspension. Just loosen the nuts on the back of it, tilt it, tighten it down when it's where you want it to be.
Sounds like you have a leak in the air suspension. Check out if it does or it will burn out the pump. Monroe makes a replacement set up for the " air -Ride". It runs you around a grand to have it replace the OEM design.
Low air suspension refers to the fifth wheel height from the ground. The suspension system (low air leaf) is a suspension system with a lower ride height and is used by many transportation companies because it allows their truck to hook up to a variety of trailers. In modern days, low air leaf has been replaced with Flex Air suspension (low air leaf is still available). Flex air has the same ride height but weighs several hundred pounds less, thus allowing the truck to haul more weight in the trailer.