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The CA-4004-1MCH produces 4000 PSI at 4.0 GPM — 16,000 cleaning units — from a 389cc Honda GX390 OHV engine paired with a CAT crankshaft pump on Mi-T-M's 128-lb aluminum frame. The 1MCH is the highest-output configuration in the CA Aluminum Series and the highest-output variant on the CA-4004 frame: at 16,000 CU it exceeds the standard CA-4004-1MAH (14,000 CU) by 14% through higher flow rather than higher pressure. The integrated external bypass system is standard on the CAT pump configuration, providing continuous pump protection without requiring a separately ordered accessory. ETL listed for US commercial use.
The CAT crankshaft pump supports the 4.0 GPM flow rate that exceeds the AR pump's standard configuration on the CA-4004-1MAH/K/M/V variants. CAT pumps are a recognized commercial-duty brand in the pressure washer industry, specified for sustained high-flow applications. The 16,000 CU output is the equivalent of applying 4000 PSI of cleaning pressure across 14% more surface area per pass compared to the 3.5 GPM configurations.
The CA-4004-1MCH's 4.0 GPM flow makes it particularly effective for large flat surface applications: parking lot and airport apron cleaning, warehouse floor washing, and large building facade cleaning where faster area coverage per pass reduces total cleaning time. Fleet operations washing high-surface-area vehicles — buses, tankers, large flatbeds — use the 16,000 CU output to maintain throughput. Industrial facilities apply it to large equipment pads and production floor areas where 3.5 GPM units require additional passes on the same surface. Property restoration contractors use the 4000 PSI output for coating prep on wide masonry surfaces. The ETL listing makes it acceptable for facility-approval procurement processes where independently certified equipment is required.
Rated at 4.0 GPM at 4000 PSI (16,000 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. Integrated external bypass system. Cold water only. 49-state engine — not for sale in California.
| PSI | 4000 PSI at rated flow |
| GPM | 4.0 GPM |
| Cleaning Units | 16,000 CU (PSI × GPM) |
| Engine | 389cc Honda GX390 OHV |
| Pump Type | CAT Crankshaft |
| Unloader | 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 | 128 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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