1/4" NPT Port Cabin Air Height Leveling Control Valve Kit Fit Hadley Mack Volvo

Cabin Air Height Leveling Control Valve Kit for Hadley, Mack, and Volvo

Cabin air height leveling control valve kit with a 1/4" NPT port regulates suspension air pressure to maintain a consistent ride height on heavy-duty trucks.

Overview

The cabin air height leveling control valve kit for Hadley, Mack, and Volvo trucks maintains level air suspension regardless of load. This mechanical valve with a 1/4" NPT port automatically adjusts air pressure to the cabin, preventing sag and boosting stability. Built for class 8 trucks, the height leveling control valve kit ensures a smooth and safe ride.

Built For Performance

• 1/4" NPT inlet/outlet port for standard air line fittings.
• All-metal brass and steel construction withstands harsh under-truck conditions.
• Adjustable linkage sets precise ride height for your cabin suspension.
• Maintains constant air bag pressure to compensate for varying loads.
• Direct bolt-on replacement for original Hadley-style leveling valves on Mack and Volvo trucks.
• Corrosion-resistant plating extends service life in road salt and moisture.

Fits These Machines

• for Hadley height control valve applications
• for Mack CH, CX, and CXN series
• for Mack Granite and Pinnacle models
• for Volvo VNL, VNM, and VNR series
• for Volvo VHD and VAH heavy-duty models

On-The-Job Use

• Maintaining cab ride height on long-haul tractors with sleeper cabins.
• Adjusting suspension for varying fifth-wheel loads and trailer weight distribution.
• Preventing air suspension sag during heavy-duty towing and recovery operations.
• Ensuring consistent cabin level for driver comfort and safety on uneven terrain.
• Replacing worn-out height control valves in vocational dump and concrete mixers.

Specs At A Glance

Good To Know

Q: How does a height control valve work? A: It senses suspension height via a linkage arm and opens or closes to add or exhaust air from the air springs, keeping the truck level.

Q: Will this valve fit my truck with a factory Hadley system? A: This kit is designed to directly replace most Hadley-type height control valves on Mack and Volvo trucks; verify valve mounting pattern and linkage orientation for your model.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.