RK18.28HNL Triplex Pressure Washer Pump – 4.75 GPM @ 4000 PSI, 1450 RPM, 24 mm Long Solid Shaft

Part Number: RK18.28HNL
Category: Pressure Washer Pumps
Type: Commercial Triplex Pump – RK18.28HNL, 4.75 GPM @ 4000 PSI (1450 RPM, Extended Shaft)

The RK18.28HNL Triplex Pressure Washer Pump is a high-performance, commercial-grade pump engineered for 1450 RPM belt-drive and gear-drive systems that demand both serious flow and extreme pressure. Delivering 4.75 GPM at up to 4000 PSI, this model is built for continuous-duty professional environments where cutting power, durability, and uptime are critical.

This variant features a 24 mm long solid shaft measuring approximately 1-7/8″, making it ½″ longer than the standard RK18.28HN. The extended shaft provides added flexibility for couplers, gearboxes, and belt-drive configurations that require extra reach—ideal for custom builds and OEM replacements where standard shaft length falls short.

Product Specifications

• Pump Model: RK18.28HNL

• Pump Type: Triplex Plunger

• Flow Rate: 4.75 GPM

• Max Pressure: 4000 PSI

• Rated Speed: 1450 RPM

• Shaft Size: 24 mm Solid (Extended ~1-7/8″)

• Inlet Port: 1/2″ FPT

• Discharge Port: 3/8″ FPT

• Oil Capacity: 15.5 oz

• Condition: New

Construction Highlights

• Forged Brass Manifold – Zero porosity for superior strength and long life under high hydrostatic pressure

• Solid Ceramic Plungers – Aluminum oxide blend for durability, thermal shock resistance, and extended seal life

• Stainless Steel Valves & Components – Corrosion-resistant poppets, seats, and springs (303 & 400 series)

• Oversized Tapered Roller Bearings – Maximum load handling and longevity

• Precision Die-Cast Crankcase – Large cooling fins and anodized finish for superior heat dissipation

• Forged, Hardened Crankshaft – Precision ground for extreme durability

• Triple-Lip Oil Seals & Dual Drain Ports – Reduced leakage and simplified maintenance

• Dyno Tested – Each pump is factory tested to ensure real-world performance matches design specs

Applications

• Commercial pressure washers

• Belt-drive and gear-drive washer systems

• Fleet wash and industrial cleaning equipment

• High-output professional washer builds

• OEM replacement for extended-shaft configurations

Important Notes

• This model features an extended 24 mm solid shaft (~1-7/8″)—approximately ½″ longer than the standard RK18.28HN

• Verify shaft length, drive method, and system RPM (1450) before ordering

• Designed for belt-drive or gear-drive systems

• Final operating PSI and GPM depend on engine or motor output and overall system configuration