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SKU:
NLT2D02527
Ships for free in 2–4 business days.
4 GPM 4000 PSI Pressure Washer Pump | 1-Inch Hollow Shaft, 3400 RPM
$318.99
In Stock
$318.99
Sale price
$318.99
Regular price
This cold-water pressure washer pump is rated up to 4 GPM and 4,000 PSI with a 1-inch hollow shaft and 3,400 RPM operating speed for compatible gas-engine washers.
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Horizontal-shaft gas pressure washers with a matching 1-inch pump shaft
- Compatible 3,400 RPM pressure washer engines and frames
Product Overview
When a pressure washer loses pressure because the pump head is cracked, the seals are worn, or the old pump has been run dry, replacing the complete assembly can be faster than rebuilding it piece by piece. This unit is for machines whose shaft, rotation, bolt pattern, engine power, and plumbing match.
A weak spray can also come from a worn nozzle, clogged inlet, air leak, unloader issue, or undersized water supply. Confirm the diagnosis and never exceed the engine, hose, gun, or accessory rating.
This is a high-quality aftermarket replacement or service part and is not manufactured or supplied by the original equipment brand. The names below identify compatible applications only.
Key Features & Performance
- Up to 4 GPM flow for compatible commercial-style cleaning setups
- Maximum working pressure up to 4,000 PSI
- One-inch hollow-shaft drive for matching horizontal engines
- Integrated adjustable unloader arrangement on compatible installations
Common Uses
- Replacing a pump that leaks internally or will not build pressure
- Restoring a washer after freeze damage or a cracked manifold
- Building a compatible 4 GPM cold-water cleaning system
Technical Specifications
- Maximum Flow: 4 GPM
- Maximum Pressure: 4,000 PSI
- Shaft: 1 in hollow
- Operating Speed: 3,400 RPM
- Maximum Water Temperature: 140°F
- Recommended Engine Power: Approximately 13.75 HP or suitable equivalent
- Outlet: 3/8 in quick-connect style
- Water Type: Cold water
Installation & Fitment
- Match shaft diameter, rotation, keyway, bolt pattern, frame clearance, and engine horsepower
- Confirm inlet and outlet fitting threads before connecting hoses
- Supply clean water at adequate flow and purge air before starting
- Never run the pump dry or aim a high-pressure stream at people, animals, wiring, or fragile surfaces
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown. Always verify the original part number, measurements, connections, and equipment configuration before purchase.
Frequently Asked Questions
Q: Will this fix every low-pressure problem? A: No. Check the nozzle, inlet screen, water supply, unloader, hose, and leaks before replacing the pump.
Q: Can I use hot water? A: The listed maximum inlet-water temperature is 140°F; it is not a dedicated hot-water pump.
Q: Is 4,000 PSI safe for all hoses and guns? A: No. Every downstream component must be rated for the system pressure and flow.
Part Summary
keywords: 4 GPM pressure washer pump, 4000 PSI replacement pump, 1 inch hollow shaft pump, 3400 RPM washer pump, cold water pressure pump, pressure washer lost pressure, horizontal engine washer pump, adjustable unloader pump
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.