Hendrickson lift axle control valve diagram

Compressor - Twin Cylinder.

Face plate measures 2. Assembled in USA. Our Michigan based experts can help. AIRman Products designs, develops and manufactures creative pneumatic solutions for the commercial transportation and specialty application industries. The products are designed specifically to handle the rigorous environment and general abuse associated within on-highway, off-highway and specialty applications.

Hendrickson lift axle control valve diagram

OF DE. Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A control system for a lift axle suspension wherein two or more axle suspensions are mounted on a vehicle frame and a liftable axle is automatically raised or lowered depending on the load on another of the axle or axles. An override to the automatic lift system is provided when the vehicle is fully loaded to lift a liftable axle selectively for a limited, relatively short period of time to assist in maneuvering the vehicle. The control system detects the load on one axle and automatically raises the second axle to the raised position when the load on the first axle is below a first predetermined value and automatically lowers the second axle to the lower position when the lower load on the first axle is above a predetermined value which is greater than the first predetermined value. A delay is provided in the operation of the control system to lower the second axle upon the detection of the load on the first axle to compensate for road bumps. An electrical sensor coupled to the load detector provides a signal to an electrical circuit in the controller to control the operation of the second axle. In one of its aspects, the invention relates to a lift axle control system having a means for automatically raising and lowering a lift axle depending on the load in the full time down axle s. Multi-axle suspensions, commonly found on trucks and trailers, typically have suspension systems which provide for selective raising and lowering of one axle with respect to the other. A control system for raising and lowering the liftable axle with respect to the "down" axle or axles is sold by the Truck Products Division of Lear Siegler, Inc. In this system, a manual toggle switch in the cab of the vehicle controls the operation of a solenoid valve which in turn controls the flow of air to air-lift air springs and to supporting air springs for the liftable axle.

If the pressure switch is very sensitive to this small change in load in the axle 26, then the lift axle would be immediately raised, at which time the load would again exceed the predetermined value.

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Need Help? The axle is rated based on the lowest capacity component fitted to that axle. The installer should check that the tire and rim combination meets the load requirements. The rating information on the Hendrickson vendor provided hubs can be found at:. For KIC wheel ends standard fit : www.

Hendrickson lift axle control valve diagram

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Exhaust all pressure in lift axle air springs and vehicle air system. Diagnostic Software - Truck Package. The output from IC1 passes through a blocking diode D1, which can be an IN one-watt diode, and to a resistor R2, for example, a ohm resistor. A control system for a lift axle according to claim 2 wherein said pressure detection means comprises a pressure switch which has a first electrical output when the pressure in said air spring corresponds to a load on said axle below said first predetermined value and has a second electrical output when the pressure in said air spring corresponds to a load on said axle above said second predetermined value. Another time-delay circuit in control circuit controls the current flow from line to the line This system relies on the operator to make judgments and to exercise that judgment. Means are provided to delay the operation of the actuation means to lower the second axle upon detection of a load on the first axle to compensate for road bumps. Pressure Gauge. A normally open inlet port 76 is open to the atmosphere and allows atmospheric pressure to pass through the valve 60 and into the lift air springs 44 in the absence of pressure in pipe Antifreeze Pump. The invention provides a system wherein a single pressure switch is used to control the position of the liftable axle. Thus, air will be exhausted from the lift air springs 44 through the control valve Shut-off Cock. Alternatively, the first suspension can be a mechanical suspension, such as a leaf spring, and the means to detect the load on the first axle can be a strain gauge. Pressure Limiting Valve.

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The control system is a pneumatic system which incorporates adjustable throttles so that short-term pressure variations will not cause raising or lowering of the liftable axle. At the same time, air pressure will be applied to the air springs 36 to maintain the second suspension in a down or supporting position. Line Filter. Thus, when the toggle switch is initially closed, current will be applied to the solenoid valve 56 for about one minute before the time-delay TD S , cuts off the current flow from line to line In the absence of electrical energy to solenoid valve 56, it will not pass air pressure therethrough between pipes 58 and The controller essentially works the same as the controller described above with respect to FIG. Push Pull Valve. Vacuum Pump. Doc Type. Compressor Cylinder Head. Thus, when the axle 40 is up and axle 26 experiences a momentary load as, for example, would occur from a road bump, a momentary pressure rise will open the pressure switch and send a signal to the integrated circuit IC1.