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Item # D185T4F, Rotair® D185T4F Ultra Silent Portable Diesel Air Compressor

Building World Class Air Compressors Since 1961

The new Rotair® D185T4F is a 185 cfm portable diesel air compressor that is Tier 4 Final compliant, which means that it meets the latest EPA requirements for low emissions.  Unlike many other Tier 4 Final products, the Rotair® D185T4F takes a minimalist approach to meeting stringent, Tier 4 Final requirements. While some other manufacturers may modify an engine that was designed before the EPA Tier program, utilizing sophisticated electronics and complicated after-treatment methods that require service, the Rotair® D185T4F starts with an engine that was designed from the ground up to meet EPA Tier 4 Final standards.

Compressor Specifications  · Engine Specifications  · General Specifications and Dimensions  · Features & Benefits  · Note

Compressor Specifications

Free Air Delivery

185 ft³/min

Working Pressure

100 psi

Air Outlets

3/4 in. x 2

Air End Type

Low Speed Rotary Screw

Air End Operating Speed

2600 rpm

Idle Speed

1500 rpm

Air Intake Filtering

Dry-Type Element

Separator Filter

Spin-On Cartridge

Engine Specifications

Diesel Engine Model

Kohler KDI1908TCR

EPA Tier

Tier 4 Final

Number of Cylinders



1.9 L



Injection System




Engine Oil Capacity

9 quart

Air Intake System

Two-Stage Dry


49.5 hp

Average Fuel Consumption @ 60%

1.85 gal/h

General Specifications and Dimensions

Fuel Tank Capacity

23.25 gal

Axle Type


Drawbar Type

HD Mechanical Square Tubing

Hitch Type

Adjustable Ball or Pintle Eye


Corrosion Proof Flex-Edge®

Trailer Lighting

Recessed Press-In


Stainless Steel Lockable


Treated Steel


All-Steel Clamshell (Full Access)

Electrical Connection

Heavy-Duty RV Type

Length without Drawbar

80.25 in

Length with Drawbar

125.5 in


60.5 in


58 in

Dry Weight

1980 lb


Five-Year, Unlimited Hour Air-End/Drive Coupling Warranty

Features & Benefits
  • 185 ft³/min @ 100 psi
  • EPA Tier 4 Final
  • Designed in the U.S. by Rental Professionals
  • New Kohler KDI1908TCR EPA Tier 4 Final Diesel Engine provides quiet and efficient power while not requiring a costly DPF System
  • Low-Speed Air-End spins at a maximum of 2600 rpm, reducing heat and virtually eliminating rotor and bearing failures
  • Curb-Side Mounted Control Panel and Adjacent Air Valves provide convenient operation and maximum operator safety
  • 23.25 Gallon Steel Fuel Tank provides for more than a full shift of run time and resists cracking, splitting, deformation and discoloration
  • Formed Steel Flex-Edge® Fenders ensure ultimate strength, durability and resilience
  • Automatic Glow Plug System for easy starts in cold weather
  • "Intelligent System" automatic load and unload feature prevents accidental loaded shutdown, and blowback
  • Minimum Pressure Check Valve on air outputs prevents back-feeding of solids or liquids
  • Heavy-Duty Running Gear with Torsion Axle and Square-Tube Drawbar
  • Concealed and Balanced Lifting Eye for safe lifting of machine
  • Easily Replaceable Push-In Running Lights with Protective Steel Bumper
  • Separate Engine Air/Compressor Intake Filters

Specify Ball or Pintle Eye Hitch.

Front Mounted Tool Box available as Option. Call for Other Options.


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