Part Number: AXD2520E
Category: Pressure Washer Pumps → Axial Cam Pumps → Electric Pressure Washer Pumps
Type: Comet AXD2520E Pressure Washer Pump with Unloader & Injector – 2.5 GPM 2000 PSI 3400 RPM 5/8" Electric Flange

The Comet AXD2520E Pressure Washer Pump with Unloader & Injector (Part #AXD2520E) is a genuine OEM axial cam pressure washer pump engineered for dependable residential and light commercial electric pressure washer applications. Manufactured by Comet Pumps, this direct-drive pump delivers 2.5 GPM at 2,000 PSI, providing reliable cleaning performance for vehicles, patios, decks, siding, outdoor equipment, fences, and general property maintenance.

Key Features & Benefits

• Genuine Comet OEM axial cam pressure washer pump
• Part Number: AXD2520E
• Factory-equipped with adjustable unloader valve
• Includes built-in downstream chemical injector
• Direct-drive axial cam design
• Delivers up to 2.5 GPM at 2,000 PSI
• Designed for electric pressure washer systems
• 5/8-inch hollow shaft with electric flange
• Operates at 3,400 RPM
• Compatible with motors up to 3.5 BHP
• 3/4" FGH water inlet
• 3/8" MPT high-pressure outlet
• Compact, lightweight OEM construction
• Excellent replacement for residential and light commercial pressure washers

Technical Specifications

Part Number: AXD2520E

Pump Model: AXD2520E

Manufacturer: Comet Pumps

Product Type: Axial Cam Pressure Washer Pump with Unloader & Injector

Maximum Flow Rate: 2.5 GPM

Maximum Pressure: 2,000 PSI

Maximum Pump Speed: 3,400 RPM

Brake Horsepower (BHP): 3.5

Shaft Size: 5/8" Hollow Shaft

Mounting Style: Electric Flange

Water Inlet: 3/4" FGH (Female Garden Hose)

High-Pressure Outlet: 3/8" MPT

Integrated Unloader: Yes

Chemical Injector: Yes

Weight: 12 lbs

OEM Replacement: Yes

Compatible Applications

Designed for use with compatible electric pressure washer systems featuring:

• 5/8-inch hollow shaft electric motors
• Electric flange mounting
• Motors up to 3.5 BHP
• Direct-drive pressure washer systems
• Residential pressure washers
• Light commercial pressure washers
• Equipment replacement and repair projects
• OEM equipment installations

Always verify shaft size, mounting configuration, motor horsepower, operating speed, and pressure/flow requirements before ordering.

Function of the Pressure Washer Pump

The AXD2520E pump helps:

• Deliver up to 2.5 GPM of water flow
• Generate operating pressures up to 2,000 PSI
• Provide dependable cleaning performance
• Regulate system pressure with the integrated unloader valve
• Draw detergents through the built-in chemical injector
• Restore pressure washer efficiency and reliability

Its integrated unloader and injector simplify installation while providing efficient pressure control and convenient detergent application.

Common Signs Replacement Is Needed

Replace the pump if you notice:

• Reduced operating pressure
• Decreased water flow
• Water or oil leaks
• Excessive operating noise
• Unloader valve malfunction
• Chemical injector failure
• Cracked or damaged pump housing
• Excessive internal wear

Replacing a worn pump restores cleaning performance while minimizing equipment downtime.

Installation & Service Notes

• Disconnect electrical power before servicing.
• Relieve all system pressure.
• Verify compatibility with the 5/8-inch hollow shaft, electric flange, motor horsepower, and pressure requirements.
• Install the pump according to the manufacturer's specifications.
• Connect the 3/4" FGH water inlet and 3/8" MPT high-pressure outlet fittings.
• Connect the detergent supply hose to the built-in chemical injector if detergent application is desired.
• Prime the pump with water before startup.
• Verify proper operation and inspect for leaks after installation.

Important: Never operate the pump without an adequate water supply. Running the pump dry can quickly damage internal components, seals, and the unloader assembly, significantly reducing pump service life.

Maintenance Recommendations

• Inspect the pump regularly for water or oil leaks.
• Check the operation of the unloader valve and chemical injector during routine maintenance.
• Maintain a clean, filtered water supply to reduce internal wear.
• Flush the chemical injector with clean water after detergent use to prevent buildup.
• Use only genuine OEM Comet replacement parts and recommended lubricants to maintain optimum pump performance, reliability, and long service life.