1. Introduction
This manual provides essential instructions for the safe and efficient installation, operation, and maintenance of your NorthStar A1572042 Super High Flow Pressure Washer Pump. This pump is designed for high-efficiency cleaning applications, delivering 3000 PSI and 5.0 GPM, and features a belt drive system for durability and performance. It is preplumbed and pretested to facilitate quick bolt-on installation.
Please read this manual thoroughly before using the product. Keep it for future reference.
2. Safety Information
WARNING: Failure to follow these safety instructions could result in serious injury or death.
- Always wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, and gloves, when operating or servicing the pump.
- Ensure the pump is securely mounted and all connections are tight before operation.
- Never operate the pump without a proper water supply. Running dry can cause severe damage.
- Do not direct the high-pressure spray at people, animals, or electrical equipment.
- Disconnect the power source from the engine before performing any maintenance or adjustments.
- Keep children and pets away from the operating area.
- Use only genuine NorthStar replacement parts to ensure proper function and safety.
3. Product Overview
The NorthStar A1572042 pump is a robust belt-driven unit designed for demanding pressure washing tasks. Its "Easy Bolt-On" design simplifies installation, making it suitable for quick integration with compatible engines.

Figure 1: NorthStar A1572042 Pressure Washer Pump. This image shows the main pump unit with its brass manifold, pressure regulator, and belt drive shaft. A clear hose is also visible in the foreground.
Key Features:
- Preplumbed and Pretested: Ensures readiness for immediate installation and operation.
- Super High Flow Design: Optimized for efficient water delivery at high pressure.
- Belt Drive System: Provides durability and reduces wear on the engine and pump.
- 24mm Pump Shaft Compatibility: Designed to fit engines with a 24mm shaft.
- High Performance: Delivers 3000 PSI and 5.0 GPM for effective cleaning.
4. Specifications
| Feature | Specification |
|---|---|
| Brand | NorthStar |
| Model Number | A1572042 |
| Maximum Pressure | 3000 PSI |
| Maximum Flow Rate | 5.0 Gallons Per Minute (GPM) |
| Drive Type | Belt Drive |
| Pump Shaft Diameter | 24mm |
| Required Engine (Gas) | 13 HP |
| Required Motor (Electric) | 10 HP |
| Item Weight | 34.6 Pounds |
| Dimensions (Package) | 15.5 x 15.5 x 11 inches |
5. Setup and Installation
The NorthStar A1572042 pump is designed for "Easy Bolt-On" installation. Ensure you have the correct engine with a 24mm shaft and sufficient horsepower (13 HP gas or 10 HP electric) before proceeding.
5.1 Pre-Installation Checklist:
- Verify engine compatibility (shaft size and HP).
- Gather necessary tools (wrenches, screwdrivers, etc.).
- Ensure a stable, level surface for installation.
- Have a clean water source readily available.
5.2 Mounting the Pump:
- Align the pump's belt drive shaft with the engine's 24mm shaft.
- Securely bolt the pump to the engine or mounting frame using appropriate hardware. Ensure all bolts are tightened to the manufacturer's specifications to prevent vibration and misalignment.
- Check for proper belt tension. The belt should be snug but allow for slight deflection.
5.3 Connecting Water Supply:
- Connect a garden hose from your water source to the pump's inlet port. Ensure the hose is free of kinks and blockages.
- Connect the high-pressure hose from the pump's outlet port to your pressure washer gun/wand.
- Ensure all connections are tight to prevent leaks.
6. Operating Instructions
6.1 Starting the Pump:
- Open the water supply valve completely to allow water to flow to the pump.
- Squeeze the trigger on the spray gun to purge air from the system until a steady stream of water emerges.
- Start the engine according to its manufacturer's instructions.
- Once the engine is running, the pump will begin to generate high pressure.
6.2 Using the Pressure Washer:
- Always hold the spray gun firmly with both hands when operating.
- Adjust the spray pattern and pressure as needed for the cleaning task.
- Maintain a safe distance from the cleaning surface to avoid damage.
6.3 Shutting Down:
- Release the spray gun trigger.
- Shut off the engine.
- Turn off the water supply.
- Squeeze the spray gun trigger to release any remaining pressure in the system.
- Disconnect hoses and store the pump in a dry, protected area.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your NorthStar pressure washer pump.
7.1 After Each Use:
- Flush the pump with clean water to remove any chemical residues.
- Inspect all hoses and connections for wear or damage. Replace as needed.
- Clean the exterior of the pump.
7.2 Seasonal Maintenance:
- Oil Change: Refer to the pump's specific oil change interval (typically after the first 50 hours, then every 100-200 hours). Use recommended pump oil.
- Belt Inspection: Check the drive belt for cracks, fraying, or excessive wear. Replace if necessary.
- Inlet Filter: Clean or replace the inlet filter to ensure unrestricted water flow.
- Winterization: If storing in freezing temperatures, winterize the pump by flushing with an antifreeze solution to prevent damage.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No pressure or low pressure |
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| Pump pulsates |
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| Water leaks from pump |
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9. Warranty and Support
NorthStar products are manufactured to high-quality standards. For specific warranty details, please refer to the warranty card included with your purchase or visit the official NorthStar website. Keep your proof of purchase for warranty claims.
For technical support, replacement parts, or service inquiries, please contact NorthStar customer service. Contact information can typically be found on the product packaging or the official NorthStar website.





