RK2120NL-CR | Gearbox Pump, 5.5 GPM 2900 PSI, 2900 PSI, Engine Mount

Overview

5.5 GPM, 2,900 PSI gearbox pump for gas engines

• The RK2120NL-CR is a heavy-duty industrial pressure washer pump engineered for operators who need
  reliable flow, stable pressure, and quick installation on gas engines.
• Delivers 5.5 GPM at 2,900 PSI at a smooth 1,450 RPM, pairing high output with
  low-speed operation to reduce heat, vibration, and wear.
• A factory-installed gearbox with Model 1689 engine mount streamlines alignment to popular small
  engines, minimizing setup time in the shop and downtime in the field.
• Built with a forged brass manifold, ceramic plungers, and stainless-steel valves, this pump is
  designed for continuous duty in harsh environments where corrosion resistance and day-in, day-out reliability are
  essential.
• A corrosion-resistant exterior finish protects the pump in damp or chemical-prone locations, while
  the 24 mm solid keyed shaft provides flexibility for accessories and service.
• User-friendly service features—including an oil sight glass, vented dipstick, and
  pre-installed break-in oil—make routine maintenance fast and predictable to keep your rig
  productive longer.

Key Specifications of RK2120NL-CR

Flow, pressure, drive, and construction details

• Flow Rate: 5.5 GPM
• Pressure Rating: 2,900 PSI
• Operating Speed: 1,450 RPM (low speed for cooler, quieter operation)
• Drive: Factory-installed gearbox with Model 1689 engine mount for rapid, accurate alignment to gas
  engines
• Shaft: 24 mm solid keyed shaft
• Manifold/Head: Forged brass with corrosion-resistant treatment
• Plungers: Ceramic for reduced friction and long wear life
• Valves: Stainless steel for consistent sealing under continuous duty
• Duty Cycle: Built for continuous industrial use

What’s Included with RK2120NL-CR

Factory-prepared pump package

• Pre-installed gearbox and Model 1689 engine mount for quick, accurate engine coupling and reduced
  setup time.
• Pre-filled break-in oil to protect internal components during first startup and early operation.
• Vented dipstick for proper crankcase ventilation and easy oil service.
• Integrated oil sight glass for fast visual checks of oil level and condition.
• Owner’s manual, schematic, and performance test documentation for installation, service, and
  troubleshooting.
• 5-year commercial warranty supported by U.S.-based service resources for long-term support.

How the Pump Works

Triplex plunger design with low-speed gearbox drive

• Uses a triplex plunger design with three precision ceramic plungers reciprocating through
  high-performance packings to create a steady, high-pressure water stream with minimal pulsation.
• The gearbox reduces and matches common engine speeds to the pump’s optimal
  1,450 RPM operating point, lowering bearing loads and internal temperatures for longer service
  life.
• Stainless-steel inlet and discharge valves snap open and closed to maintain consistent pressure,
  while the forged brass manifold preserves valve alignment under continuous load.
• The 24 mm keyed shaft accepts standard couplers and accessories, simplifying integration into
  existing frames, skids, and mobile trailers.
• The corrosion-resistant exterior finish shields the pump from humidity, wash chemicals, and coastal
  environments, helping extend service intervals and maintain appearance.

Benefits of RK2120NL-CR

Installation speed, performance, and longevity

• Plug-and-work installation: Gearbox with Model 1689 engine mount minimizes alignment errors and
  speeds commissioning.
• High output at low RPM: 5.5 GPM at 2,900 PSI delivers strong cleaning performance while reducing
  heat, vibration, and component stress.
• Industrial durability: Ceramic plungers, stainless-steel valves, and a forged brass manifold stand
  up to daily continuous-duty use.
• Corrosion protection: Exterior finish and treated components resist rust in damp, chemical-prone,
  or coastal environments.
• Maintenance made simple: Sight glass and vented dipstick make oil checks and changes fast,
  predictable, and easy for operators.
• Quality assured: Each unit is factory-tested for performance and backed by a 5-year commercial
  warranty.

Typical Use Cases

Continuous-duty commercial and industrial cleaning

• Food facility sanitation: Frequent washdowns of equipment, floors, and walls where uptime and
  consistent pressure matter.
• Chemical processing plants: Routine cleaning in areas with chemical exposure where corrosion
  resistance is critical.
• Fleet washing and vehicle depots: High-flow rinsing for trucks, buses, rentals, and heavy
  equipment.
• Commercial janitorial and contract cleaning: Reliable power for large-area washdowns and periodic
  deep cleaning.
• Paint removal prep and surface conditioning: Removes oils, residues, and chalking before coating,
  repair, or resurfacing.
• Municipal and facilities maintenance: Daily cleaning of grounds, structures, and service vehicles.

Why Choose the RK2120NL-CR

High-volume gearbox pump for long-term service

• If your rig needs more water volume without sacrificing durability, the RK2120NL-CR delivers with
  5.5 GPM at 2,900 PSI.
• Low-speed 1,450 RPM geometry enhances longevity, while the gearbox with Model 1689 engine mount
  takes the guesswork out of alignment—one of the most common causes of premature wear.
• Ceramic plungers, stainless-steel valves, forged brass manifold, and a corrosion-resistant finish
  combine to create a pump built for dependable service shift after shift.
• Backed by a 5-year commercial warranty, it is a long-term upgrade for professional contractors,
  facilities, and fleet operators who need consistent results and minimal downtime.

Order the RK2120NL-CR Today

Upgrade to reliable 5.5 GPM, 2,900 PSI performance

• Equip your pressure washer system with the RK2120NL-CR Industrial Pressure Washer Pump and gain
  reliable 5.5 GPM at 2,900 PSI performance, quick engine mounting, and low-maintenance operation.
• Factory-tested, pre-oiled, and backed by a 5-year commercial warranty, it is a smart, long-term choice for
  professional-duty cleaning equipment.