YAMATIC 7/8" Shaft Vertical Pressure Washer Pump 3000 PSI 2.5 GPM — Rear‑Outlet, Adjustable Unloader

The YAMATIC 7/8" shaft vertical pressure washer pump delivers up to 3000 PSI and 2.5 GPM performance as a direct replacement pump for rear-outlet engines, restoring lost cleaning power without buying a new machine.

If your pressure washer lost pressure or started leaking, swapping in this YAMATIC vertical pump is an economical way to get high-pressure cleaning back. Designed for rear-outlet and adaptable to many common engine models, this pump balances rugged internal components with service-friendly features so you can wash patios, vehicles, fences and driveways again quickly.

Will this pump work with my pressure washer engine?

The YAMATIC 7/8" shaft vertical pump is built to fit many rear-outlet engines in the 6.5–7 HP range and matches common engine bolt patterns. It’s compatible with numerous OEM models from brands like Honda, Subaru, Ryobi, Simpson and Craftsman; check the engine shaft size and outlet orientation before buying. Note: it won’t fit machines that use an idle-down feature unless otherwise modified.

• 7/8" drive shaft designed for rear-outlet engines (can be rotated for front inlet engines with frame drilling).
• Recommended for engines 180–196cc (6.5–7 HP) that support up to 3000 PSI and 2.5 GPM.
• Lists of compatible part numbers include Honda GCV series, Subaru EA190V, Ryobi and Simpson references.

How durable is this replacement pump and what maintenance does it need?

This YAMATIC pump is engineered for extended runtime with upgraded piston surfacing, reinforced bearings and a double-seal arrangement to reduce leaks. A maintenance-free crankcase eliminates routine gasoline changes, and the thermal relief valve helps prevent heat damage during bypass operation. With proper installation and use within rated limits, it delivers long service life between replacements.

• Double-seal construction and improved piston surfaces for leak resistance.
• Thermal relief valve (TRV) reduces overheating when the pump is on bypass.
• Maintenance-free crankcase—no routine crankcase fluid changes required.

What performance and adjustability can I expect?

The pump is rated up to 3000 PSI at 2.5 GPM and performs best in the 2600–3000 PSI range at typical engine speeds. An adjustable unloader enables fine-tuning of operating pressure so the pump and engine can be balanced for smoother running and optimal cleaning. Quick cold starts are supported by built-in startup features so you can get to work faster.

• Max output: 3000 PSI and 2.5 GPM at approximately 3400 RPM.
• Adjustable unloader allows increasing or reducing pressure to match engine output.
• Cold-start friendly design, plus included siphon tube, mounting bolts and shaft key.

How easy is installation and what comes in the kit?

Installation is straightforward for most rear-outlet machines and typically takes 5–10 minutes for experienced users. The package includes the necessary mounting hardware and a siphon tube with filter so you can replace the pump and get running without sourcing extra parts. If your machine has a front inlet/outlet, you can rotate the pump 180° and alter the frame mounting, though a front-specific pump is simpler if you want to avoid drilling.

• Includes mounting bolts, shaft key, siphon tube with filter, and instruction booklet.
• Quick setup—most installs completed in under 10 minutes for compatible machines.
• Requires frame modification for front inlet/outlet conversions; choose a front-inlet pump to avoid drilling.

Who is this for: The YAMATIC 7/8" shaft vertical pump is aimed at homeowners, contractors and DIYers who own small-engine pressure washers with rear outlet designs and need an economical, high-performance replacement. It’s ideal for people who want a durable, easy-to-install pump that restores strong cleaning power for routine outdoor tasks without buying a new pressure washer.