WP-4200-0MKB Gas Pressure Washer — Work Pro 4200 PSI with Kohler CH440
The Mi-T-M Work Pro WP-4200-0MKB pairs the Work Pro 4,200 PSI output with a 429cc Kohler CH440 OHV engine instead of the Honda GX390. Output is identical to the 0MHB variant: 4,200 PSI at 3.4 GPM, 14,280 cleaning units, through the same Mi-T-M crankshaft pump. The Kohler CH440 is a commercial-grade heavy-duty OHV with cast-iron cylinder sleeve, specified by buyers who run Kohler-powered fleets or prefer Kohler's commercial warranty structure.
WP-4200-0MKB Kohler CH440 Engine and Pump System
The CH440 at 429cc is the largest Kohler CH-series single-cylinder, used in heavy-load applications including commercial mowers, generators, and high-output pumps — the torque headroom ensures the pump stays at 4,200 PSI under continuous load.
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4,200 PSI at 3.4 GPM (14,280 CU) — same output as the Honda variant; choose engine on service preference, not output difference
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429cc Kohler CH440 OHV engine — Kohler's largest CH-series commercial single-cylinder; cast-iron sleeve, full-pressure lubrication, extended drain intervals
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Mi-T-M crankshaft pump — brass manifold, thermal relief valve, Pressure Relief Start, in-line water strainer; rated for sustained heavy commercial use
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Adjustable pressure unloader — variable pressure for different surfaces and applications without a nozzle change
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50-foot × 3/8-inch wire-braided hose — adequate for fleet wash bays, building exteriors, and structural steel cleaning from a single position
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10-inch flat-free tires, powder-coated steel frame — outdoor-rated construction for job site exposure
WP-4200-0MKB Applications and Environments
Municipal equipment yards, county road departments, and agricultural cooperatives that standardize on Kohler-powered equipment find the WP-4200-0MKB integrates cleanly into their existing service and parts program. The CH440's full-pressure lubrication system is better suited for sustained high-load operation than splash-lube designs — important when the machine runs 4–6 hours per day on fleet washing routes. Construction and demolition cleanup contractors use the 14,280 CU output for post-demo concrete and masonry cleanup. At 142 lbs, two-person handling is required for trailer loading; the machine is otherwise maneuverable on flat surfaces via the 10-inch tires.
WP-4200-0MKB GPM, PSI, and Nozzle Configuration
Rated at 3.4 GPM at 4,200 PSI (14,280 cleaning units) at rated flow. Includes 15°, 25°, and detergent quick-connect nozzles; 50-foot × 3/8-inch wire-braided hose; 36-inch two-piece lance with trigger gun. Cold water only. 49-state Kohler CH440 — not for sale in California.
Specifications
| PSI |
4,200 PSI at rated flow |
| GPM |
3.4 GPM |
| Cleaning Units |
14,280 CU (PSI × GPM) |
| Engine |
429cc Kohler CH440 OHV |
| Pump Type |
Mi-T-M Crankshaft |
| Unloader |
Adjustable Pressure |
| Hose |
50 ft × 3/8 in wire-braided |
| Nozzles Included |
15°, 25°, detergent |
| Net Weight |
142 lbs |
| Dimensions (L × W × H) |
40 × 22.5 × 24.5 in |
| Hot/Cold |
Cold water only |
| California Sale |
Not for sale in CA (49-state engine) |
Documents
Spec Sheet
Manual
