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The CA-3504-1MAK produces 3500 PSI at 3.5 GPM — 12,250 cleaning units — from a 429cc Kohler CH440 OHV engine paired with an AR crankshaft pump on Mi-T-M's 125-lb aluminum frame. The CH440 is Kohler's largest single-cylinder commercial engine, providing the displacement reserve needed to maintain rated 3500 PSI / 3.5 GPM output under sustained load in hot ambient conditions. All three CA-3504 standard variants — Honda GX390 (1MAH), Kohler CH440 (1MAK), Mi-T-M OHV (1MAM) — produce the same output from the same frame. The 1MAK is the choice for operations with established Kohler dealer relationships or with the CH440 already in their equipment fleet. ETL listed for US commercial use.
The Kohler CH440 displaces 429cc — notably larger than the Honda GX390's 389cc — which provides additional torque reserve at the high end of the pressure range. At 12,250 CU the CA-3504 handles work that overtaxes the CA-3003: removing heavy equipment fouling in single passes, stripping loose coatings from masonry, and washing large commercial vehicle fleets efficiently. The 125-lb aluminum frame with 13-in flat-free tires handles rough job-site terrain that can stop smaller-wheeled units.
Operations running Kohler-powered generators, line stripers, or floor sweepers add the CA-3504-1MAK to standardize their CH440 parts shelf across equipment categories. Fleet maintenance departments that service vehicles with heavy road salt deposits, mud, and industrial coating residue rely on the 12,250 CU output for single-shift completion of washing cycles. Construction firms use it for concrete form stripping and equipment prep. Agricultural operations apply it to post-harvest equipment cleaning where caked grain, silage, and fertilizer residue require sustained high-pressure output. Industrial plants use it for machinery washdown between production cycles.
Rated at 3.5 GPM at 3500 PSI (12,250 cleaning units) at rated flow. Includes quick-connect nozzles in 0°, 15°, and 25° patterns; 50-ft × 3/8-in non-marking high-pressure hose; 48-in lance with insulated trigger gun. Cold water only. 49-state engine — not for sale in California.
| PSI | 3500 PSI at rated flow |
| GPM | 3.5 GPM |
| Cleaning Units | 12,250 CU (PSI × GPM) |
| Engine | 429cc Kohler CH440 OHV |
| Pump Type | AR Crankshaft |
| Unloader | Mi-T-M Adjustable Pressure |
| Hose | 50 ft × 3/8 in non-marking |
| Lance | 48 in |
| Nozzles Included | 0°, 15°, 25° quick-connect |
| ETL Listed | Yes |
| Net Weight | 125 lbs |
| Dimensions (L × W × H) | 42.5 × 23.5 × 24.5 in |
| Hot/Cold | Cold water only |
| California Sale | Not for sale in CA (49-state engine) |
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