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Item # D40K, Rotair D40K Diesel Portable Compressor

The Rotair D40K produces a solid 40 cfm @ 100 psi in a small, but well-built package. At only 572 pounds, it offers the versatility to be truck mounted or easily moved to the jobsite by forklift or jib. Featuring a liquid-cooled, Kubota Tier 4 Industrial Diesel Engine, the D40K performs like the big boys but has a smaller footprint, and an even smaller thirst for fuel. With an average consumption of 0.53 gallons per hour, fuel costs are almost insignificant when compared to other air compressors. The D40K is solid and quiet, with the same design features of larger Rotair compressors, including a Direct-Drive Air-End, Premium Sound Attenuation System and Spin-On Filters. And, because Rotair understands that you wouldn't buy an air compressor you didn't need, it builds the D40K in a way that it is comfortable in protecting with a Five-Year, Unlimited-Hour Warranty on the Air-End and Drive Coupling (see details on website). Just because the D40K is the smallest diesel compressor in Rotair’s line, it does not mean that it is any less important to either of us.

Compressor Specifications  · Engine Specifications  · General Specifications and Dimensions

Compressor Specifications

Free Air Delivery

40 ft³/min

Working Pressure

100 psi

Air Outlets

1 x 3/4 in

Air End Type

Direct Drive Screw

Compressor Oil Capacity

1.58 gal

Air Intake Filtering

Dry-Type Element

Separator Filter

Spin-On Cartridge

Engine and Compressor Oil Filter

Spin-On Cartridge

Engine Specifications

Diesel Engine Make


Diesel Engine Model

Z 602

Number of Cylinders



600 cc



Injection System




Maximum Speed

3200 rpm

Minimum Speed (Idle)

1700 rpm

Engine Oil Capacity

0.66 gal

Air Intake System

Single-Stage Dry


14.1 hp

Full Load Fuel Consumption

0.89 gal/h

Average Fuel Consumption @ 60%

0.53 gal/h

EPA Tier


General Specifications and Dimensions

Minimum Sound Pressure Level


Fuel Tank Capacity

4 gal

Electrical System

12 V


40 in


27.8 in


33.5 in

Dry Weight

572 lb