Oriental Power Pressure Washer Pump Head AR42518 — 2800 PSI 2.3 GPM Replacement Assembly

The Oriental Power AR42518 pump head assembly is a complete aftermarket replacement for axial-cam pressure washer pumps rated up to 2800 PSI and 2.3 GPM, compatible with many Craftsman, Generac, B&S, Troy-Bilt and Honda models.

If your pressure washer is losing pressure, leaking at the pump head, or requires a full pump-head replacement, this assembled unit provides a ready-to-install alternative to expensive OEM parts. The kit ships fully assembled with seals, check valves, unloader and related components so you can restore performance quickly on compatible axial-cam pumps. It’s designed to fit a broad range of consumer and light-commercial machines while addressing common leakage and sealing issues.

What exact models and part numbers does this pump head replace?

This assembly is engineered as a drop-in aftermarket replacement for several OEM numbers and models commonly found on consumer pressure washers. It covers variants used by Craftsman, Generac, B&S and Troy-Bilt, among others.

• Fits Craftsman 2300 PSI models and pump number 704667 (e.g., model 580.754.910)
• Compatible with Generac 2700 PSI and many B&S VR2500/2800 PSI axial-cam pumps
• Cross-references include AR42940, AR43061 and AR42518 style pump heads
• Not compatible with SRMW and RMW series pumps specified as SRMW2.3G28, SRMW2.4G28, RMW2.5G28

How does this assembly address leaks and low-pressure issues?

The unit arrives fully assembled with upgraded sealing and welded joints intended to improve long-term sealing and reduce common leak points. Replacing a worn pump head with this assembly restores internal check valves, seals, and the unloader function—components that most often cause pressure loss.

• Includes water seals and check valves to re-establish one-way flow and pressure
• Thermal relief and unloader valves included to protect against overheating and overpressure
• Advanced welding at critical cast joints to minimize leakage compared with some previous designs
• Comes with inlet/outlet tube and chemical injector for immediate installation

What are the performance limits and installation considerations?

Designed for axial-cam pumps, the replacement head supports up to 2800 PSI and flows up to 2.3 GPM. Installation requires basic mechanical skills: removing the old head, transferring any compatible fittings, and ensuring correct orientation of the unloader and chemical injector.

• Maximum pressure: 2800 PSI; maximum flow: 2.3 GPM
• Intended for 7.5 HP and similar consumer-grade engines driving axial-cam pumps
• Not compatible with the SRMW and RMW series listed earlier—verify pump model before purchase
• Package arrives assembled with valves and tubes, reducing time and complexity of replacement

What comes in the box and what tools will I need?

The package contains the full pump head assembly with internal components preinstalled, so you’ll avoid juggling tiny parts during the swap. Typical hand tools and a basic mechanical shop setup are sufficient for the changeover.

• Included: pump head assembly, water seals, check valves, unloader valve, chemical injector, e-z start valve, thermal relief valve, inlet/outlet tube
• Tools recommended: socket set, wrench set, screwdrivers, thread sealant or PTFE tape, brief run-in oil or pump lubricant
• Allow time for flushing and leak checks after installation before full-duty use

Who is this for: The Oriental Power AR42518 pump head assembly suits homeowners, rental fleet managers, and small contractors who need a cost-effective, ready-to-install replacement for worn axial-cam pump heads on mid-range pressure washers. If your machine matches the listed compatibilities and you’re comfortable with mechanical replacement tasks, this kit restores pressure, replaces worn internals and reduces downtime compared with rebuilding individual components.