HP4040UR Pump & Gearbox Assembly – HP4040 / UDOR Pump, 1″ Shaft
Part Number: HP4040UR
Category: Pressure Washer Pumps & Pump Assemblies
Type: Pump & Gearbox Assembly – HP4040 / UDOR Gear-Drive, 4.0 GPM @ 4000 PSI
The HP4040UR Pump & Gearbox Assembly is a factory-built, gear-driven solution centered around the HP4040 / UDOR triplex pump paired with a 5038.C2 gear reducer for 1″ shaft engines. Delivering 4.0 GPM at 4000 PSI and engineered for 1450 RPM operation, this assembly is designed for commercial and industrial pressure washer systems that demand smooth power transfer, reduced pump wear, and long service life. With a heavy-duty 24 mm pump shaft and robust construction throughout, it provides a true drop-in replacement for engine-driven units requiring reliable high-pressure performance in continuous-duty environments.
Product Specifications
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Pump Model: HP4040 / UDOR
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Manufacturer: General Pump
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Assembly Type: Complete pump & gearbox assembly
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Pump Type: Triplex Plunger, Gear Drive
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Flow Rate: 4.0 GPM
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Max Pressure: 4000 PSI
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Rated Speed: 1450 RPM
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Engine Shaft Requirement: 1″
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Pump Shaft Size: 24 mm
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Gear Reducer: 5038.C2
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Weight: 42 lb
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MPN: HP4040UR
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Condition: New
Features & Benefits
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Gear-drive system for efficient power transfer and reduced belt maintenance
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High-pressure 4000 PSI output for demanding cleaning tasks
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Designed for engines with 1″ output shafts
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Smooth, low-RPM operation for extended pump life
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Heavy-duty triplex plunger construction
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Ideal for continuous-duty commercial environments
Applications
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Engine-driven commercial pressure washers
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Gear-drive pressure washer systems
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Fleet wash and industrial cleaning equipment
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Equipment repair, refurbishment, and performance upgrades
Important Notes
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Verify engine shaft size (1″), pump shaft size (24 mm), and RPM compatibility (1450) before ordering
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Designed for systems using HP4040 / UDOR gear-drive pumps
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Final operating PSI and GPM depend on engine speed and overall system configuration
