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AR RKA4G40HN Pressure Washer Pump – 4.0 GPM 4000 PSI 24mm Short Shaft 1" Inlet

Original price $599.99 - Original price $599.99
Original price
$599.99
$599.99 - $599.99
Current price $599.99

Part Number: RKA4G40HN
Category: Pressure Washer Pumps → Triplex Pumps → Belt Drive Pressure Washer Pumps
Type: AR RKA4G40HN Pressure Washer Pump – 4.0 GPM 4000 PSI 24mm Short Shaft 1" Inlet


The AR RKA4G40HN Pressure Washer Pump (Part #RKA4G40HN) is a genuine OEM triplex plunger pump engineered for demanding commercial and industrial pressure washing applications. Built by Annovi Reverberi (AR), this heavy-duty pump delivers 4.0 GPM at 4,000 PSI, providing exceptional cleaning performance for fleet washing, construction equipment, agriculture, manufacturing facilities, and other high-pressure cleaning operations.


Key Features & Benefits

  • Genuine AR (Annovi Reverberi) OEM triplex pressure washer pump
  • Part Number: RKA4G40HN
  • Heavy-duty triplex plunger design
  • Delivers up to 4.0 GPM at 4,000 PSI
  • Low-speed 1,750 RPM operation for extended service life
  • 24 mm short shaft configuration
  • 1-inch water inlet
  • Compatible with belt-drive and gear-drive systems
  • Requires approximately 11 BHP
  • Suitable for engines up to 14.5 GHP
  • Smooth, efficient operation with reduced vibration
  • Designed for continuous commercial and industrial use
  • OEM-quality durability and performance

Technical Specifications

Part Number: RKA4G40HN

Pump Model: RKA4G40HN

Manufacturer: AR (Annovi Reverberi)

Product Type: Triplex Pressure Washer Pump

Maximum Flow Rate: 4.0 GPM

Maximum Pressure: 4,000 PSI

Maximum Pump Speed: 1,750 RPM

Brake Horsepower (BHP): 11

Gas Horsepower (GHP): 14.5

Shaft Size: 24 mm Short Shaft

Water Inlet: 1"

Weight: 19 lbs

OEM Replacement: Yes


Compatible Applications

Designed for use with compatible pressure washer systems featuring:

  • 24 mm shaft drive systems
  • Belt-drive pressure washers
  • Gear-drive pressure washers
  • Commercial pressure washers
  • Industrial cleaning equipment
  • Fleet washing systems
  • Agricultural cleaning equipment
  • Construction equipment cleaning
  • OEM equipment replacement and custom builds

Always verify shaft dimensions, mounting configuration, horsepower requirements, and pressure/flow specifications before ordering.


Function of the Pressure Washer Pump

The RKA4G40HN pump helps:

  • Deliver up to 4.0 GPM of water flow
  • Generate operating pressures up to 4,000 PSI
  • Provide reliable continuous-duty cleaning performance
  • Operate efficiently at lower pump speeds
  • Reduce heat buildup and internal wear
  • Extend equipment service life in demanding applications

Its low-speed triplex plunger design provides superior durability, smoother operation, and longer service life than high-speed direct-drive pumps.


Common Signs Replacement Is Needed

Replace the pump if you notice:

  • Reduced operating pressure
  • Decreased water flow
  • Water or oil leaks
  • Excessive operating noise
  • Cracked or damaged pump housing
  • Excessive internal wear
  • Loss of cleaning performance
  • Pump failure during operation

Replacing a worn pump restores pressure washer performance while minimizing equipment downtime.


Installation & Service Notes

  • Shut down the pressure washer and relieve all system pressure.
  • Disconnect the engine or motor before servicing.
  • Verify compatibility with the shaft size, mounting configuration, pulley alignment, and horsepower requirements.
  • Install the pump according to the manufacturer's specifications.
  • Fill the crankcase with the recommended pump oil before operation if required.
  • Connect the water inlet and high-pressure discharge plumbing.
  • 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 the plungers, seals, and valves, significantly reducing pump service life.


Maintenance Recommendations

  • Check the pump oil level regularly and change the oil according to AR maintenance intervals.
  • Inspect packings, seals, valves, and fittings during routine service.
  • Maintain clean, filtered inlet water to minimize internal wear.
  • Check belt alignment and tension periodically on belt-drive systems.
  • Use only genuine OEM AR replacement parts and approved lubricants to maintain optimum performance, reliability, and long service life.

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