The Kaeser Mobilair M118 and M125 are towable diesel rotary-screw air compressors delivering 405 CFM at 100 PSI for heavy civil, demolition and blast-pot crews that outrun 185 CFM machines. The M118 runs a 114 hp Deutz TCD 3.6L4 with 100 and 145 PSI working pressures; the M125 steps up to a 121 hp Deutz TCD 4.1L04 with variable pressure to 205 PSI, holding 342 CFM at the top setting.

Four air outlets three 3/4 in. and one 1-1/2 in. feed multi-tool circuits or a single large-bore line: enough for four 90 lb breakers running continuously or two large blast pots. Both models sit in our diesel-driven compressor lineup on a torsion-bar chassis with galvanized canopy, and every drop line should carry a whip check at the coupling. For help matching CFM to tool count, see the air compressor buyer’s guide.

• 405 CFM at 100 PSI continuous output from Kaeser’s SIGMA PROFILE single-stage oil-injected rotary-screw airend
• M118: 114 hp Deutz TCD 3.6L4, 100/145 PSI working pressures; M125: 121 hp Deutz TCD 4.1L04, variable to 205 PSI with 342 CFM at 205 PSI
• Towable steel chassis with torsion-bar suspension, rigid tow bar and galvanized canopy; 4,462-4,580 lb operating weight
• 45 gal fuel tank for full-shift runtime; 76 dB(A) sound level at 23 ft
• Air outlets: three 3/4 in. plus one 1-1/2 in. for multi-tool and large-hose distribution
• 188 x 74 x 68 in. footprint; 2050-2200 RPM full load, 1500-1600 RPM unload
• Applications: heavy civil construction, demolition, sand and shot blasting, foundation drilling and pipeline pressure testing
• Stocked by Crowder Supply in Denver with Genuine Kaeser service parts; optional 5-year air-end warranty

Mobilair M118 & M125 FAQ

What is the difference between the M118 and M125?
Both deliver 405 CFM at 100 PSI; the M118 runs a 114 hp Deutz TCD 3.6L4 with 100 and 145 PSI working pressures, while the M125 steps up to a 121 hp Deutz TCD 4.1L04 with variable pressure to 205 PSI, holding 342 CFM at the top setting for blast work.

How many breakers will 405 CFM run?
Enough for four 90 lb breakers running continuously, or two large blast pots at once, through three 3/4 in. outlets and one 1-1/2 in. outlet.

What warranty does the airend carry?
Kaeser offers an optional 5-year air-end warranty when the prescribed maintenance schedule is followed, and Genuine Kaeser service parts are stocked for both engine variants.

How loud are they on site?
Both models measure 76 dB(A) at 23 ft inside the galvanized canopy.