Aftermarket Ingersoll Rand 30290944 Crankpin Cap Assembly

Operation of Starting Unloading System

The purpose of the system is torelieve cylinder pressure when the compressor stops permitting itto start against a light load; increasing the life of the driverand belts and also reducing the possibility of tripping theoverload relay. The system operates in the following MANNer:

The centrifugal unloader is attachedto the end of the crankshaft, thus when the compressor is inoperation, centrifugal force acts upon the unloader weights andthey swing outward. When the compressor stops, these weightsretract, permitting the thrust pin spring to move the plunger andthrust pin outward. The thrust pin opens the pilot valve and thetrapped air pressure escapes from the cylinder and intercoolerthrough a passage in the frame end cover through the unloader tubeand to atmosphere through the inlet filter/silencer. The cylindersand intercooler are now relieved of all pressure and the compressoris unloaded.

When the compressor starts,centrifugal force acts upon the unloader weights and they swingoutward. This permits the plunger and thrust pin to move inward andthe pilot valve to close. The escape path to atmosphere for thecylinder pressure is now closed and the compressor pumps air in anormal MANNer. If the pilot valve tube line is excessively hot, itis a good indication that the pilot valve is leaking and adjustmentis required.

Meets or Exceeds OEM Specifications

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• Meets Or Exceeds OEM Specifications
• Cost Effective Solution To OEM Parts
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• OEM Names And Part Numbers Are For Reference Only