Description
Precision-machined crankshaft journals drive the Rolair K18 Single-Stage Compressor Pump to deliver dependable replacement air volume on contractor wheelbarrow and stationary compressors. The cast-iron twin-cylinder pump delivers 4.5 to 7.5 CFM displacement at operating pressures up to 135 PSI when coupled to one-to-two horsepower electric motors or four-to-5.5 HP gas engines. Equipment mechanics rebuild damaged jobsite compressors without replacing entire machines. Operating this pump requires filling the crankcase with synthetic compressor oil before motor startup.
Pump Displacement Airflow Bench Limits
Flowmeter dynamometer testing confirms the pump produces 4.5 CFM at 90 PSI when driven at 750 RPM by a 1.5-horsepower electric motor, and up to 7.2 CFM at 90 PSI when driven at 1100 RPM by a five-horsepower Honda engine. The multi-blade cast-iron flywheel directs a continuous sixty-mile-per-hour cooling air blast across cylinder cooling fins, holding crankcase temperatures below 160 degrees Fahrenheit during four-hour load trials. Concentric disc valves withstand ten million continuous pressure flex cycles without reed fracture.
Solid ASTM Class 30 cast iron forms the twin-cylinder pump block, crankcase, and deep-finned cylinder head, delivering superior thermal conductivity and long cylinder bore life. An automotive-style cast iron flywheel features integrated fan blades to cool cylinder barrels during operation. Sized as a universal replacement pump, the unit weighs 36 lbs, measuring 11 inches long, 10 inches wide, and 12.5 inches high, featuring a standard four-bolt slotted base pattern.
Key Features of Rolair K18
Equipment repair shops and contractors buy Rolair K18 Single-Stage Compressor Pumps to rebuild worn contractor compressors and custom pneumatic power units. Compare commercial replacement air compressor pump pricing to restore high-pressure air output on jobsite equipment.
- Solid 100-percent cast-iron cylinder and crankcase construction delivers exceptional thermal heat dissipation and long service life.
- Twin-cylinder single-stage design produces up to 7.5 CFM displacement, matching one-to-two HP electric or 5.5 HP gas engines cleanly.
- Heavy cast-iron flywheel with integrated fan blades drives cooling air across cylinder fins to lower operating heat cleanly.
- Swedish stainless steel reed valves resist heat deformation and carbonization, ensuring long maintenance intervals cleanly.
- Universal four-bolt slotted base pattern allows fast direct mounting onto standard compressor tank saddle plates cleanly.
Compressor Rebuild Negative Selection Filter
The clear glass oil sight gauge provides immediate visual verification of proper crankcase lubricant level. Do not purchase this single-stage pump for high-pressure two-stage applications requiring 175 PSI cut-out pressure, direct-drive 3450 RPM motor couplings without belt pulleys, or oil-free medical air systems. Routine maintenance requires verifying crankcase oil level before daily operation, changing synthetic pump lubricant after the initial fifty-hour break-in period, and cleaning foam air intake filter elements every forty operating hours.
Factory Warranty Delivery Manifest
Rolair backs this replacement compressor pump with a 1-Year limited manufacturer warranty covering casting flaws, valve breakage, and bearing failures. The factory shipment box includes one complete K18 cast-iron compressor pump with flywheel, intake air filter assembly, and an illustrated technical parts breakdown guide.
