The Hydraulic Manifold is a critical component to the operation of a truck dumper. Learn about how they function, components, and how to service them.
A hydraulic manifold is a pressurized steel pipe which splits/diverts the flow of oil from the power unit to the cylinders. The manifolds are critical to ensure even flow rates and pressure are sent to the cylinders for optimal dumper performance.
Manifold Components
1.) Power Unit Connection
The power unit connection is the attachment point of the power unit line to the hydraulic manifold. The connection point is typically in the center of the manifold, but some models are offset to one side near the swivel. There are two connection types: a quick-connect for use with hoses, and a threaded hardline connection. See photos below for details.
2.) Manifold
The manifold is a steel pipe which splits the oil flow from the power unit to the cylinders. Most manifolds have the power unit attachment in the center, but some models have a return so the power unit attachment in on one side near the swivel. The manifold is typically made of painted carbon steel pipe but can be stainless steel if corrosion resistance is required.
3.) Mounting Blocks
All Airoflex manifolds come with mounting blocks. The mounting blocks can be attached to the concrete foundation or set on steel mounting brackets. The rubber mounting blocks secure the manifold in place, reduce vibration from the power unit, and provide some electrical insulation.
4.) Swivel
The swivel fitting is attached on each output end of the manifold. They are made of brass or steel and are threaded for connection to the manifold. The swivels allow for movement / rotation of the hoses and cylinders when the dumper is in use.
5.) Hose
Hoses provide a flexible connection from the manifold to the cylinders. Hoses are sized to allow for the movement / rotation of the cylinders during operation. All hoses should be rated for a minimum of 2,000 psi.
6.) Check Valve
Check valves mount direction to the cylinder oil ports. Their purpose is to restrict the flow of oil in the case of pressure loss so the dumper will lower in a controlled manner. Standard Airoflex cylinders have larger check valves, while inverted cylinders have small valves. See photos below for details.
General Notes
Hydraulic Manifolds are pressurized piping and should be protected and serviced with proper safety procedures. Pressured oil is dangerous and leaks or damage to the manifold or other hydraulic components should be repaired or replaced as soon as possible. Any time work is done to the manifold or hydraulic components, the system should be depressurized and locked out. See the downloads page for regular maintenance checklists. Always refer to the operating manual for hydraulic specific information. Contact Airoflex for spare/replacement parts or help with servicing a manifold.