YAMATIC Pressure Washer Pump 3/4" Shaft Horizontal — 3400 PSI 2.6 GPM, Aluminum Body

The YAMATIC horizontal pressure washer pump is a direct-fit replacement pump with a 3/4" shaft that delivers up to 3400 PSI at 2.6 GPM for restoring power washer performance without replacing the entire machine.

If your gas pressure washer has lost pressure or started leaking, swapping in a new pump is often the fastest, most cost-effective repair. This YAMATIC pump is built for horizontal-mount engines with a 3/4" shaft and is designed to match common small-engine pressure washers (about 6.5–7.0 HP). It’s aluminum-bodied, comes with an adjustable unloader, and arrives with the hardware needed for a quick installation.

How will this pump improve my pressure washer’s performance?

The pump restores lost pressure and flow, returning cleaning power to walls, driveways, decks, and vehicles. It’s optimized to perform best between 2800–3400 PSI and pairs with engines that can sustain roughly 3400 RPM under load.

• Max rated output: 3400 PSI at 2.6 GPM.
• Best operating band: 2800–3400 PSI for steady cleaning power.
• Engine compatibility: fits most engines ~212cc (6.5–7.0 HP).
• Horizontal mounting with 3/4" keyed shaft for direct replacement.

What features make this pump durable and low maintenance?

The YAMATIC pump uses an anodized die-cast aluminum housing and an upgraded double-seal system to resist corrosion and reduce leakage. Internal components like improved pistons and bearings are finished for longer lifecycle and the crankcase is sealed so you don’t need routine oil changes.

• Fully anodized aluminum body for rust protection.
• Double-seal design to minimize fluid leaks and contamination.
• Upgraded piston and bearing surface treatments for extended life.
• Maintenance-free sealed crankcase—no routine oil changes required.

How easy is installation and does it include everything I need?

Designed for straightforward swap-outs, the kit includes mounting bolts, a shaft key, a siphon tube with filter, and instructions so most users can install it in 5–10 minutes. The adjustable unloader simplifies matching pressure to your engine and eliminates the need to bleed the system before cold starts.

• Includes bolts, shaft key, siphon tube with filter, and instruction booklet.
• Built-in easy-start design—no pressure release required to start engine.
• Adjustable unloader to fine-tune pressure for your engine’s output.
• Quick-install expectations: roughly 5–10 minutes for most users.

Which machines is this pump compatible with and what measurements matter?

This pump is engineered to replace many popular models from Simpson, Karcher, Honda, Generac and others, but it requires a horizontal 3/4" shaft—engines with a 7/8" shaft will not fit. Verify the diagonal hole-to-hole and shaft/key dimensions before ordering to ensure a correct match.

• Common replacements: selected Simpson, Karcher, Honda, Delta, PowerStroke, Powerboss models.
• Mounting dimensions: diagonal screw-hole spacing 3 5/8"; hole-to-hole 2 9/16".
• Shaft key: 3/16" width; shaft depth: 2 5/8".
• Important: incompatible with 7/8" engine shafts.

Who this pump is for: The YAMATIC 3/4" horizontal pump is ideal for DIYers, rental shops, landscapers, and homeowners who want to repair a tired gas pressure washer rather than buy a new unit. Choose this pump if your machine supports up to 3400 PSI at 2.6 GPM, has a horizontal 3/4" keyed shaft, and you want a durable, low-maintenance replacement with an adjustable unloader for tuning pressure to your engine’s capability.