The DEWALT DH4240B is a belt-drive professional pressure washer powered by a Honda® GX390 389cc OHV engine and an AAA industrial triplex plunger pump with a brass head, rated at 4,200 PSI and 4.0 GPM—16,800 cleaning units. Belt-drive operation runs the pump at lower RPM than the engine for cooler, quieter performance and extended pump life, making the DH4240B the premium choice for contractors and property managers who need daily-use reliability.
What is the advantage of belt drive on the DH4240B versus direct drive?
Belt-drive systems use a belt and pulley to reduce the pump shaft speed relative to the engine. This means the pump runs at 1,000–1,400 RPM instead of the engine's 3,400+ RPM, resulting in lower pump operating temperatures, less wear on seals and valves, quieter operation, and a significantly longer pump lifespan compared to direct-drive units.
What Honda engine does the DH4240B use?
The DH4240B is powered by a Honda GX390 OHV engine with 389cc displacement and approximately 11.7 HP. The GX390 features Honda's Oil Alert® low-oil shutdown, a cast-iron cylinder sleeve for durability, and a proven commercial-grade design used across construction and industrial equipment worldwide.
How does the DH4240B differ from the DXPW4240?
Both models use a Honda GX390 engine and AAA triplex pump to deliver 4,200 PSI at 4.0 GPM. The key difference is the drive system: the DH4240B uses belt drive for cooler, quieter pump operation and longer pump life, while the DXPW4240 uses direct drive for a more compact form factor. The DH4240B is also heavier at approximately 145 lbs versus 139 lbs for the DXPW4240.
What hose and nozzles come with the DH4240B?
The DH4240B includes a 50 ft. x 3/8 in. steel-braided high-pressure hose and five quick-connect nozzle tips (0°, 15°, 25°, 40°, and Soap). The 3/8-inch hose diameter supports the high 4.0 GPM flow rate without excessive pressure drop over the full 50-foot length.
Is the DH4240B appropriate for daily commercial use?
Yes. The DH4240B is DEWALT's top-tier belt-drive gas pressure washer, designed for professional contractors and property managers who need reliable daily-use performance. The combination of Honda GX390 engine, AAA triplex pump with brass head, and belt-drive system is specifically engineered for continuous-duty operation.
What warranty does the DH4240B carry?
The DH4240B is backed by a 3-year limited warranty covering defects in materials and workmanship. The Honda GX390 engine carries a separate Honda commercial engine warranty. DEWALT also offers its standard 90-day money-back guarantee.
# DEWALT® 4200 PSI 4.0 GPM Gas Pressure Washer with Honda® Engine and AAA Triplex Plunger Pump (Tool Only) **Model:** `DH4240B` **Brand:** DEWALT **Category:** Pressure Washer > The DEWALT DH4240B is a belt-drive professional pressure washer powered by a Honda® GX390 389cc OHV engine and an AAA industrial triplex plunger pump with a brass head, rated at 4,200 PSI and 4.0 GPM—16,800 cleaning units. Belt-drive operation runs the pump at lower RPM than the engine for cooler, quieter performance and extended pump life, making the DH4240B the premium choice for contractors and property managers who need daily-use reliability. ## Specifications | Attribute | Value | |---|---| | Product Type | Gas Pressure Washer | | Power Source | Gas | | Cordless / Corded | Corded | | Psi Max | 4,200 | | Gpm | 4 | | Engine | Honda GX390 OHV | | Engine Cc | 389 | | Pump Type | Triplex | | Drive Type | Belt Drive | | Hose Length Ft | 50 | | Weight (lbs) | 145 | | Dimensions | 45 in. L x 28 in. W x 25.5 in. H | | Country of Origin | United States | | Barcode (UPC) | 636893402340 | | Warranty | 3-year limited | ## What's Included - (1) Pressure Washer Source: https://www.jaspecs.com/dewalt/pressure-washer/dh4240b-dewalt-4200-psi-40-gpm-gas-pressure-washer-honda-engine-and-aaa-triplex-plunger/