EMAX 10 HP 120-Gallon Two-Stage Air Compressor ESP10V120V1PK

The EMAX ESP10V120V1PK is a complete 10 HP compressed air system that combines a two-stage piston compressor, 120-gallon vertical tank, and 58 CFM refrigerated air dryer in one package. Delivering 38 CFM (34 CFM at 175 PSI) from a 230V single-phase power supply, it provides high-pressure airflow without requiring three-phase service. Its standout feature is the Silent Air noise-suppression system, which reduces operating noise by up to 50% compared with similar compressors, while the 100% cast iron pressure-lubricated pump is designed for an estimated 70,000-hour service life.

The pressure lubrication system continuously delivers oil to critical components through a gear-driven pump, helping reduce wear during demanding cycles. The pump uses cast iron cylinders, heads, crankshaft, connecting rods, and high-pressure pistons for long-term durability, while the four-ring piston design improves sealing and reduces oil carryover. The included 58 CFM refrigerated air dryer removes moisture before air reaches your tools, using built-in prefilters to help protect air lines and equipment from contamination.

Built for automotive repair shops, professional garages, and industrial applications, this compressor package is designed for users who need dependable airflow with reduced noise and easier maintenance. Features like the continuous-run head unloader, cast iron flywheel with dual B-style belts, dual-bolt belt tensioner, and automatic tank drain help improve cooling, reduce component stress, and support reliable operation through long workdays.

Features

Pressure Lubrication

A rear-mounted, gear-driven oil pump creates positive oil pressure and continuously supplies lubrication to every bearing point. The crankshaft and connecting rods are rifle-drilled, allowing oil to flow directly to critical areas such as wrist pins and bearings.

Unlike splash-lubricated systems, pressure lubrication delivers oil exactly where it is needed, making it ideal for high-stress, continuous-duty operation. The system includes an automotive-style spin-on oil filter to keep the lubricant clean, along with a liquid-filled gauge and adjustable regulator for accurate oil pressure monitoring and adjustment.

Oil pump features:

• Bleeder valve for easier priming
• Liquid-filled oil pressure gauge
• Gear-driven oil pump
• Adjustable pressure regulator
• Spin-on oil filter

100% Cast Iron Pump

The pump is built with cast iron throughout the major load-bearing components, including the crankcase, cylinders, cylinder heads, crankshaft, connecting rods, and high-pressure piston. There are no aluminum sleeves beneath the finish.

Cast iron high-pressure pistons are designed to resist cylinder scoring under heavy loads, while CNC-machined solid cast iron connecting rods feature replaceable bearing inserts and wrist pins, allowing the rod assembly to be fully rebuilt rather than replaced.

The low-pressure pistons are aluminum by design because they operate at approximately 45 PSI, where the lighter material improves balance and efficiency.

Four-Ring Piston and Connecting Rod Design

The piston system uses a four-ring design with two oil-control rings and two compression rings. The oil rings remove excess oil during the downstroke, while the compression rings maintain a tight seal to reduce blow-by.

This design helps minimize compression loss, reduce oil carryover, and extend ring service life. Rifle-drilled oil passages in each connecting rod deliver lubrication from the crankshaft directly to the piston pin and bearing surfaces.

Disc Valves and Cast Iron Heads

The compressor uses CNC-machined concentric-ring disc valves that are precision surface-ground for reliable sealing and extended service life. Compared with feather or fixed reed valves, disc valves provide improved durability and easier maintenance.

Valve servicing is simple: remove the retainer, lift out the valve for inspection, and reinstall it when service is complete.

The solid cast iron cylinder heads use tapped mounting holes for secure retention and maintain a reliable head-gasket seal without frequent retorquing.

Cast Iron Cylinders

The cylinders are CNC-machined and precision-honed to maintain bore concentricity and improve sealing performance. Deep cooling fins increase surface area to maximize heat dissipation during high-duty-cycle operation.

Deep-bored, threaded mounting holes allow proper torque application, helping maintain gasket durability over long service intervals.

Continuous Run with Head Unloader

The compressor supports continuous-run operation with a 60% duty cycle. When the receiver tank reaches its preset pressure, the pilot valve unloads the compressor by holding the intake valve open, allowing the motor to continue running without compressing air.

This reduces unloaded amp draw by up to 60%, improves cooling airflow through the cylinders, and helps protect the motor and magnetic starter from excessive start-stop cycling.

For applications requiring duty cycles above 40%, a ball valve connected to the pilot valve can be opened to enable continuous-run operation.

Heavy Cast Iron Flywheel and Belt Drive

The 10 HP pump uses a 20-inch cast iron flywheel with two B-style groove belts and nine large cooling fins. The flywheel’s added mass stores kinetic energy to reduce amp draw, while the multi-belt drive provides increased contact area and improved grip compared with narrow single A-width belts.

The wider belt design operates with lower belt tension, reducing stress on motor and pump bearings while minimizing noise and extending belt life.

A dual-bolt belt tensioner allows precise belt alignment and adjustment without requiring a pry bar.

Pump Riser, Automatic Drain, and Dryer System

A pump mounting riser elevates the compressor pump to allow 360-degree airflow from the flywheel around the oil reservoir and underneath the pump, improving cooling performance.

The dual-timer electric auto drain automatically removes moisture from the receiver tank with adjustable drain intervals from 1 to 45 minutes and customizable open duration settings. An integrated air muffler helps reduce discharge noise.

The included 58 CFM refrigerated air dryer removes moisture from compressed air before it reaches the air system. It features a built-in 0.001-micron prefilter and a 0.005-micron coalescing prefilter to improve air quality and help protect downstream equipment.

Specifications

Warranty

EMAX provides a 1-year standard warranty for the compressor, covering defects in materials, workmanship, and parts. The warranty also includes one year of labor coverage performed by an authorized technician.

By registering the compressor at emaxwarranty.com and following EMAX’s recommended maintenance schedule using EMAX SMART OIL, coverage can be extended to 5 years. Enrollment in the SMART OIL auto-ship program further upgrades the pressure-lubricated pump to a limited lifetime warranty that is non-prorated and has no hour limit. All other non-wear components remain covered for 5 years under the extended warranty program.

Refrigerated Dryer Warranty

The included refrigerated dryer has its own 1-year standard warranty. Coverage can be extended to 3 years by completing registration and purchasing one Airbase dryer filter replacement kit each year while maintaining the required service schedule.

Extended Maintenance Requirements

The EMAX 5-Year Extended Warranty Kit (EFKIT008AWBS), sold separately, supports the required startup and scheduled maintenance for 5–10 HP Silent Air electric models. Maintenance requirements include changing the factory break-in oil within the first 70 hours of operation, followed by oil changes every 6 months or 1,000 hours using approved EMAX oil.

FAQ

What electrical service does it need?

The compressor requires 230V single-phase power (±10%) with a recommended 60-amp breaker. It draws 52.9 full-load amps with a 1.15 service factor and can reach approximately 270 amps during startup. No three-phase electrical service is required.

Can it run all day?

Yes. The continuous-run head unloader allows the motor to continue running without compressing air when the tank reaches maximum pressure, reducing unnecessary start-stop cycling.

For applications requiring more than a 40% duty cycle, the ball valve connected to the pilot valve can be opened to enable continuous-run operation.

Is the air dryer included?

Yes. The package includes a 58 CFM refrigerated air dryer with a built-in 0.001-micron prefilter and 0.005-micron coalescing prefilter. The dryer is sized as part of the complete compressed-air system and helps remove moisture before air reaches downstream equipment.

What maintenance does the warranty require?

To maintain extended warranty eligibility, the break-in oil must be changed within the first 70 hours of operation. After that, oil changes are required every 6 months or 1,000 hours, whichever comes first, using approved EMAX oil and maintaining the proper oil level.

Registration at emaxwarranty.com is required for extended warranty coverage. The EFKIT008AWBS service kit includes the required maintenance components for 5–10 HP Silent Air electric models.

Documents

• Piston Compressor Manual
• Refrigerated Air Dryer Manual
• Compressor Warranty Statement
• Air Dryer Warranty Statement