Description
LEVELING VALVE W/DUMP
Part Number: FHV9990C
Direct replacement (cross ref) for HV9990.
Product Overview
This leveling valve controls ride height by adjusting air pressure in the suspension. The “with dump” feature allows you to release air when needed, usually for loading and unloading, as well as lowering the truck. This unit replaces OEM part HV9990 and is commonly used in air ride suspension setups.
What the Part Does
The valve monitors the position of the suspension and adds or releases air to keep the truck sitting at the correct height. When the load changes, the valve reacts and adjusts pressure to bring things back to level. The dump function gives you manual or system-controlled ability to lower the suspension when needed.
Common Problems This Part Solves
When a leveling valve starts to fail, it usually shows up as:
- Truck sitting too high or too low
- Uneven ride height side to side
- Slow response to load changes
- Air leaks around the valve
In some cases, the dump feature may stop working altogether.
Why Replacement Matters
If the truck isn’t sitting level, everything else is affected: ride quality, handling, tire wear, even driveline angles. A bad valve can also cause the system to constantly adjust, putting extra load on the air system.
Replacing it restores proper ride height control and keeps the suspension working the way it should.
Compatibility and Fitment
This valve replaces the OEM part HV9990. Always confirm mounting style and linkage setup to ensure proper operation.
Installation and Service Notes
You need to mount the valve, connecting air lines, and set the linkage to the correct height position. Adjustment is key, because if it’s set wrong, the truck won’t sit correctly. Check air lines, air bags and fittings while you’re there. Leaks elsewhere can look like a valve problem.
Use Case
Used in suspension repairs, ride height issues, or when trucks aren’t sitting level under load. The use is varied and according to need.
About Us
We’re a family-owned group of Peterbilt dealerships dedicated to getting you the parts you need quickly and affordably. Whether you’re looking for Paccar OEM parts, reliable aftermarket replacements, or popular upgrades like seats and filters, we make it easy to keep your truck running and on the road. If you don’t see what you need online, just give us a call or send an email — chances are we can get it. We pride ourselves on fast service, fair prices, and being a partner you can depend on when downtime isn’t an option.
