Polar Air Honda GX Gas Driven w/Electric Start 18 HP V4 39CFM Pressure Lubricated 30 Gal.Truck Mount Stationary Air Compressor

Pressure lubrication reduces friction and internal wear by delivering a continuous flow of oil to each bearing point via a gear oil pump, keeping bearings cool and extending pump life. Each crankshaft and connecting rod is gun-drilled for precise oil flow, while a spin-on automotive-style oil filter ensures clean oil for maximum longevity. An analog pressure gauge allows operators to monitor oil pressure accurately, providing reliable performance and peace of mind.

Many compressors rely on aluminum components, which do not offer the same durability and rigidity as cast iron. All major components of our compressors are constructed from cast iron, including:

● Crankcase
● Cylinder heads
● Cylinders

● Connecting rods
● Crankshaft
● High-pressure piston

Pressure Lubricated pumps feature a high-performance pressure lubrication system, delivering superior protection and longevity under demanding conditions. A gear-driven oil pump, mounted to the rear of the crankshaft, generates positive oil pressure, ensuring consistent lubrication throughout the system.

All crankshaft and connecting rods are rifle-drilled, allowing direct oil flow to key wear points— including bearings and other high-friction components. A SPIN ON automotive-style oil filter provides clean, efficient filtration for optimal performance and simplified maintenance during oil changes.

Unlike splash-lubricated systems, pressure lubrication delivers oil precisely where it's needed, reducing friction, wear, and heat—especially in high-stress, continuous-duty environments. This is the most effective method for keeping your compressor running stronger, longer.

Head unloaders are ideal for constant-run applications. They relieve the intake valve during operation, improving pump cooling and reducing overall wear under heavy workloads. This feature enhances reliability and extends the service life of the compressor in demanding environments. On our gas-powered compressors, continuous-run head unloaders provide decompression during engine startup, reducing load on the electric starter and ensuring smoother, more efficient starts.

Our pumps utilize a four-ring piston design, featuring precision-engineered overlap rings that minimize compression loss and significantly reduce oil carryover. This configuration enhances sealing efficiency, improves overall pump performance, and supports long-term reliability under demanding operating conditions.

Our pumps feature high-quality, non–oil-absorbent gaskets designed to minimize oil leakage. This ensures a more reliable seal, reduces maintenance requirements, and contributes to the long-term efficiency and durability of the pump.

Our disc valve system is engineered to deliver exceptional durability in both intake and exhaust functions, ensuring reliable performance over decades of use. This design enables efficient maintenance without the need to remove the cylinder head, significantly reducing service-related downtime. In contrast, many competitors rely on reed valves, which require head removal and are less suitable for demanding, heavy-duty applications.

Each compressor pump is fitted with a large cast iron flywheel to increase kinetic energy and reduce motor strain. We offer both dual-belt and triple-belt configurations. All pumps utilize standard B-groove belts, which provide increased belt-to-flywheel surface contact, enhancing belt longevity. The flywheel has large cooling fans which increases airflow across the pump.

Unlike traditional aluminum heads—known for their susceptibility to gasket failure—our cast iron cylinder heads and valves are precisely machined to deliver superior strength, reliability, and long-term performance.

Our pumps utilize tapered roller bearings on both the front and rear of the crankshaft to ensure smooth, reliable operation. The automotive-style connecting rods feature rebuildable bearings at both the piston pin and the crankshaft connection. In contrast, many competitors rely on aluminum connecting rods, which are non-rebuildable and must be discarded when worn.

Dual Control

Our dual control system offers greater operational flexibility. Choose between Auto Start/Stop Mode or Continuous Run Mode based on your compressor’s usage pattern:

● Auto Start/Stop is ideal when usage is 30% or less.
● Continuous Run is better when frequent cycling exceeds 30%.

Continuous Run Mode

The Continuous Run Mode decompresses the intake valves using a pilot valve with a preset PSI, reducing start-up stress on the motor. This prevents wear on the electric motor, centrifugal switch, magnetic starter, and cuts down on energy spikes—helping to lower your electricity bill. Additionally, when freewheeling (not compressing), the pump continues to cool internally, helping dissipate excess heat generated during compression and protecting the system from long-term wear.

Dual-Bolt Belt Tensioner

Our dual-bolt belt tensioner makes belt adjustments easier and more precise. This design ensures proper alignment while maintaining optimal belt tension, reducing wear and tear for longer belt life and enhanced serviceability. Using pry bars to tension your belts is no longer required.