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Aftermarket Ingersoll Rand 30210272 Crankpin Cap Assembly

Aftermarket Ingersoll Rand 30210272 Crankpin Cap Assembly

Part #: 30210272

Regular Price: $103.50

Special Price $80.00

Availability : Contact Us
Crankpin Cap Assembly




Operation of Starting Unloading System

The purpose of the system is to relieve cylinder pressure when the compressor stops permitting it to start against a light load; increasing the life of the driver and belts and also reducing the possibility of tripping the overload relay. The system operates in the following manner:

The centrifugal unloader is attached to the end of the crankshaft, thus when the compressor is in operation, centrifugal force acts upon the unloader weights and they swing outward. When the compressor stops, these weights retract, permitting the thrust pin spring to move the plunger and thrust pin outward. The thrust pin opens the pilot valve and the trapped air pressure escapes from the cylinder and intercooler through a passage in the frame end cover through the unloader tube and to atmosphere through the inlet filter/silencer. The cylinders and intercooler are now relieved of all pressure and the compressor is unloaded.

When the compressor starts, centrifugal force acts upon the unloader weights and they swing outward. This permits the plunger and thrust pin to move inward and the pilot valve to close. The escape path to atmosphere for the cylinder pressure is now closed and the compressor pumps air in a normal manner. If the pilot valve tube line is excessively hot, it is a good indication that the pilot valve is leaking and adjustment is required.

Meets or Exceeds OEM Specifications

eCompressedair provides quality aftermarket replacement compressor parts that meet or exceed the original OEM specifications. Aftermarket parts are more cost effective than brand name parts and can typically allow for a reduction in your annual maintenance costs over the life of the compressor.

We are constantly adding new resources to offer you the widest selection; we manufacture and supply only new air compressor parts and repair kits. This allows us to keep thousands in stock, offering you the fastest shipping and most competitive price. is working hard to be the easiest and most reliable online source for you to find all your aftermarket replacement air compressor parts and repair kits. We carry thousands of aftermarket air compressor parts in stock and available online 24/7 for your convenience or by calling toll-free: (866) 650-1937.

eCompressedair is an independent supplier of aftermarket compressor replacement parts and is not affiliated with manufacturers mentioned in this web site. Original equipment manufacturer (OEM) names are the trademarks of each manufacturer. On products marked "equivalent" or "replacement," OEM names and part numbers are for reference only.