Kaeser MOBILAIR M55PE Towable Rotary Screw Air Compressor - 185 CFM, Diesel
185 CFM is the size most contractors actually need: two breakers plus a hose reel, or a single large tool with headroom left over. The M55PE gets there on 43 BHP of Kubota Tier 4 Final with a 21-gallon tank, which is a full shift of running for most crews. Standard build tops out at 125 psig; a 145 psig model is available if the work calls for it.
185 CFM is the size most contractors actually need: two breakers plus a hose reel, or a single large tool with headroom left over. The M55PE gets there on 43 BHP of Kubota Tier 4 Final with a 21-gallon tank, which is a full shift of running for most crews. Standard build tops out at 125 psig; a 145 psig model is available if the work calls for it.
Every MOBILAIR shares the same core engineering. The large, slow-turning SIGMA PROFILE® airend delivers 15–20% more air per gallon of fuel than comparable units, which is the single biggest line item over a machine's life. The anti-frost valve holds discharge air temperature high enough that ambient moisture will not freeze in the tool, protecting air motors and extending tool service life. Heavy-duty chassis and canopy resist corrosion; package airflow is routed to keep the engine cool under load; and the cold-start battery means the unit turns over in winter. Towable models ride on torsion bar suspension with even weight distribution.
Specifications
| Model | M55PE |
|---|---|
| Free air delivery | 185 CFM @ 100 psig |
| Engine | Kubota D1803CR-T Tier 4 Final |
| Fuel | Diesel |
| Brake horsepower | 43 BHP @ full load |
| Full load speed | 2300 - 2700 rpm |
| Off load speed | 2300 rpm |
| Drive type | Gear |
| Fuel tank capacity | 21 gal |
| Air discharge outlets | 2 x 3/4" + 1 x 1" |
| Dimensions (L x W x H) | 120 x 60 x 58 in. (towbar); brochure lists 113 in. |
| Shipping weight | 1,918 lb (approx.) |
| Sound level | 76 dB(A) max at 23 ft |
| Mounting | Towable |
Free air delivery by pressure
| Pressure | Delivery |
|---|---|
| 100 psig | 185 CFM |
| 145 psig | 155 CFM |
Specifications from the Kaeser MOBILAIR price list effective 07-01-26 and the USMOBILAIR brochure 01/26. EX WORKS shipping point. Prices and specifications subject to change without notice.
Specifications
| Air Treatment Package | Standard - no aftercooler or Aftercooler + centrifugal separator or Aftercooler + separator + filter or Aftercooler + separator + heater or Aftercooler + separator + heater + filter |
| Discharge Pressure | Standard pressure or 145 psig |
| Mounting | Towable (standard) or Skid mounted or Stationary (anti-vibration pads) |