Aftermarket 284358 D-2 Style Air Compressor Governor, Replaces 275491

Product Description

  • Manufacturer: Bendix
  • Part Number: 284358X
  • Condition: Remanufactured
  • Bendix reman valves have the same warranty as new valves
  • Pressure Range: Adjustable from 105-125 psi
  • High temperature o-rings and waterproof cover
  • Includes gasket and pipe plugs

The Bendix D-2 governor Air Brake Controls Valve the pressure in the air system. The compressor runs continuously while the engine is running, so the D-2 governor activates the compressor’s unloader mechanism when system pressure reaches the governor’s cut-out pressure. It deactivates the unloaders once system pressure has dropped to the governor’s cut-in pressure. While unloaded, the compressor simply pumps air from one cylinder to the other rather than send it to the tank.

Cross References: 284358N, 284358, 284358X, 102178, 102178X, 108818, 227435, 275491, 275491X, 275707, 275707X, 18537, KN18500X, KN18530, KN18537, VHD18537
A cross reference listing means that this valve is a suitable replacement for the part numbers listed. Some changes in air line plumbing may be required.

D-2 Air Governor

Never condemn or adjust the governor pressure settings unless you have checked pressure with an accurate test gauge or a dash gauge that is registering accurately. Standard dash gauges are only required to be accurate to within +/- 10 percent.

Remember the following if adjustment is necessary:

  1. Turn the adjusting screw counter-clockwise to lower the air pressure setting.
  2. Turn the addjusting screw clockwise to increase the air pressure setting.
  3. Be careful not to overadjust. Each quarter turn of the adjusting screw raises or lowers the pressure setting approximately 4 psi.
  4. The cut-in and cut-out range is not adjustable.

The most common cause of governor failure is contamination. Blow out all attaching lines, hoses, etc when replacing a governor. Make sure the reservoir pressure sensing line is routed from the reservoir so that no contamination may enter the line and pass into the governor. A replacement D-2 air governor can be found here.


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