Rolair
Rolair PMP12MK113GR air compressor pump 4 hp 1 stage 12 in flywheel
Single-stage pump delivers 15.1 cfm at 145 psi with a 12 in flywheel and splash lubrication
- 4 hp motor delivers 15.1 cfm at 145 psi
- Single-stage design simplifies maintenance with reed valves
- 12-inch flywheel runs at 1,400 RPM for smooth operation
- Stainless-steel valves resist corrosion for longer service life
- 30 fl oz splash-lubricated system keeps internals protected
Rolair 4 hp single-stage compressor pump
The Rolair PMP12MK113GR is a splash-lubricated, single-stage air compressor pump rated at 4 hp maximum output. It delivers 15.1 cfm at 145 psi and features a 12 in flywheel for belt-driven operation. The aluminium and cast iron construction houses two cylinders with stainless steel reed valves.
Verify shaft rotation and mounting before ordering
This pump rotates counter-clockwise and uses an A-section single-groove flywheel for belt drive. Ensure your motor or engine shaft matches the pump’s input requirements and that the 12 in flywheel diameter clears your frame. Confirm the 30 fl oz oil capacity suits your maintenance schedule.
Thermal and noise profile in normal use
At 1,400 RPM the cast iron cylinders dissipate heat through the aluminium crankcase during continuous duty. Splash lubrication reduces mechanical noise compared with dry-running designs. The stainless steel reed valves maintain sealing efficiency at the 145 psi maximum pressure rating.
Highlights
- 4 hp motor delivers 15.1 cfm at 145 psi
- Single-stage design simplifies maintenance with reed valves
- 12-inch flywheel runs at 1,400 RPM for smooth operation
- Stainless-steel valves resist corrosion for longer service life
- 30 fl oz splash-lubricated system keeps internals protected
Specifications
| Brand | ROLAIR |
|---|
Questions about this item
Does the pump come with the 12 in flywheel or do I need to order it separately?
The 12 in flywheel is included with the pump so no separate purchase is required.
Should I select the 2 hp or 4 hp rating for a shop running at 145 psi?
The pump delivers 15.1 cfm at 145 psi on the 4 hp rating and 9.9 cfm at the same pressure on the 2 hp rating, so choose the higher rating for maximum airflow.
What does 15.1 cfm at 145 psi actually give me on a 400 RPM pump?
At 400 RPM the two-cylinder, single-stage pump produces 15.1 cfm of free air delivery when working against the full 145 psi maximum pressure.
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