New & used commercial Altorfer Generators for saleIndustrial-Rated Altorfer Generators

Altorfer Is a Caterpillar Dealer, Not a Manufacturer

Altorfer is not a generator manufacturer in the way Caterpillar or Cummins is. Altorfer Cat is a Caterpillar dealer serving Illinois, Iowa, and Missouri, and the units that carry the Altorfer name are Caterpillar-engineered equipment sold, packaged, or fleet-operated through that dealership. The Altorfer units that come through our inventory are typically APS-series trailer-mounted diesel generators built on Caterpillar or Perkins engines. Perkins is a Caterpillar company, so either way the engine traces back to the same manufacturer. For buyers, that means an Altorfer unit shares parts support and service familiarity with the broader Caterpillar generator lineup.

Altorfer Generator Trailers

Alongside complete generators, we carry Altorfer generator trailers built to carry mobile gensets between sites. The Altorfer XQ400 trailer we have stocked, for example, fits Caterpillar XQ230, XQ300, XQ350, and XQ400 generators, plus Multiquip DCA250, DCA300, and DCA400 units. Features include electric actuated hydraulic brakes with a battery backup breakaway system, a mechanical parking brake, full-length fenders, and heavy-duty safety chains. A replacement trailer is often the most economical way to keep a mobile generator in service when the original running gear wears out. Browse our parts, accessories, and more for other trailers and add-ons, and confirm compatibility with us before ordering. If you run Multiquip generators, the same trailer may fit your fleet.

Altorfer Generator Sizes

The Altorfer mobile generators that move through our inventory sit in the mid-size mobile class, built for construction sites, rental fleets, event power, and temporary facility support. Units like the APS100, rated 100 kW standby and 90 kW prime, land in the 100kW – 249kW range. Trailers built for the Cat XQ230 through XQ400 class serve generators in the 250kW – 374kW and 375kW – 499kW ranges. If your load sits below that, 75kW – 99kW generators may serve at lower cost. Our power calculators will get you a working estimate, and you can compare every available output on our shop by kW page.

Used Altorfer Units Versus Rental Rates

Renting fits a single project with a defined end date. Our rental division, Stag Power Rentals, handles that work. Buying wins once a mobile unit stays busy. Contractors running a generator across back-to-back projects typically find that a year of rental payments approaches the price of an inspected used machine. Our used industrial generators keep the upfront cost down, and our generator financing options spread it out further.

Inspecting Used Altorfer Fleet Equipment

Every generator we sell passes a 22-point inspection and load bank testing before it ships. For fleet equipment that has spent years moving between sites, testing under load is what separates a well-maintained unit from one that only looks the part. We have been buying and selling industrial generators for more than a decade. Every purchase is backed by our 30-day IronClad warranty. After delivery, our service team handles preventative maintenance and generator repair for the life of the equipment. Compare Altorfer against every other manufacturer we carry on our shop by brand page.

Ready to Buy an Altorfer Generator?

Tell us what you are powering, or which generator you need a trailer for, and we will match you to the right unit. Browse our trailer-mounted generators and full inventory, or contact us to talk it through.