51779031 Ingersoll Rand OEM Drive Coupler

The 51779031 Ingersoll Rand OEM Drive Coupler is an original equipment coupling for select Ingersoll Rand portable air compressor platforms. This elastomeric coupling provides the flexible connection between the diesel engine and compressor airend, absorbing torsional vibration and compensating for minor shaft misalignment during operation.

IR portable compressors equipped with this coupler are mid-range units used in construction, utility, and industrial field service. The coupling uses a Reich Arcusaflex-style design with a bonded elastomer element that dampens engine firing pulses before they reach the airend. Over time, heat, torsional fatigue, and environmental exposure cause the elastomer to harden and crack, reducing damping effectiveness.

The 51779031 is a direct factory replacement. Verify this part number against your compressor’s service manual before ordering. During installation, clean all mating surfaces, inspect hub condition, and align per IR’s specifications. Run the compressor through a full warm-up cycle and check vibration levels before returning to service.

In stock at Stark Industrial Products for same-day shipping.