AR Annovi Reverberi RMW22G24-EZ Pressure Washer Pump Instruction Manual

1. Product Overview

The AR Annovi Reverberi RMW22G24-EZ is a replacement right-handed triplex plunger pump designed for vertical gas engine driven pressure washer units. This pump delivers 2.2 GPM at 2400 PSI and operates at 3400 RPM. It features a keyed hollow shaft connection system for direct mounting onto most 7/8-inch diameter shaft vertical gas engines (4-7 HP). Key components include a built-in pressure control valve, downstream chemical injection system, EZ start valve, and thermal relief valve.

Image 1.1: Overview of the AR Annovi Reverberi RMW22G24-EZ pump.

Key Features:

• Triplex Plunger Pump: Durable 3-piston design for efficient operation.
• Performance: Max 2400 PSI, 2.2 GPM, 3400 RPM.
• Easy Start Valve: Facilitates smoother engine startup.
• Thermal Relief Valve: Protects the pump from overheating.
• Chemical Injection System: Downstream system for detergent application.
• Shaft Size: Designed for 7/8" vertical gas engine shafts.
• Inlet Thread: 3/4" GHA.
• Discharge Thread: 22mm x 1.4M.

2. Setup and Installation

2.1 Pre-Installation Checklist:

• Ensure the pressure washer engine is turned off and cooled down.
• Shut off the water supply and release any residual pressure by pressing the trigger on the spray gun.
• Gather necessary tools: correct size wrenches (13mm for original bolts, Allen wrench for set screw if applicable), threadlocker (blue), anti-seize lubricant, and a pry bar (if needed for stubborn pumps).
• Confirm the new pump's specifications (shaft size, PSI, GPM, thread sizes) match your pressure washer's requirements. This pump is for 7/8" vertical shafts.

Image 2.1: Diagram illustrating the difference between Left-Handed SX and Right-Handed Non-SX pump mounting configurations. The RMW22G24-EZ is a Right-Handed Non-SX pump.

2.2 Removing the Old Pump:

1. Disconnect all hoses (water inlet, high-pressure outlet, chemical injection tube).
2. Locate and remove the bolts securing the old pump to the engine block. For this model, there are typically three bolts.
3. If your old pump has a set screw securing it to the engine shaft (common on 7/8" shaft strap-style pumps), locate the access opening near the shaft. Gently pull the recoil start cable to rotate the shaft until the set screw is visible. Use an Allen wrench to remove it.
4. Carefully slide the old pump off the engine shaft. If it's stuck due to corrosion, a pry bar can be used cautiously, but avoid damaging the engine housing.
5. Clean the engine shaft thoroughly with a rag and a cleaning solvent. Avoid spraying solvent directly onto the shaft to protect the oil seal. Apply anti-seize lubricant to the shaft and keyway to prevent future corrosion.

2.3 Installing the New Pump:

1. Ensure the keyway is properly seated in the engine shaft. If using a new keyway, clean it and apply anti-seize.
2. Align the keyway slot on the new pump with the key on the engine shaft. Carefully slide the new pump onto the shaft. It may require gentle rotation or slight adjustments to align correctly.
3. Hand-tighten the mounting bolts to secure the pump to the engine block. If there is a gap between the pump and the engine block, use appropriate spacers to ensure a flush fit. Over-tightening without spacers can damage the pump or engine.
4. Tighten the bolts evenly in a criss-cross pattern, similar to tightening lug nuts on a car tire, to ensure the pump is securely and uniformly mounted. Blue threadlocker can be applied to the bolt threads to prevent loosening from vibration.
5. If a set screw was removed, reinstall it and tighten it.
6. Reconnect the water inlet hose (3/4" GHA) and the high-pressure outlet hose (22mm x 1.4M). Ensure all connections are tight to prevent leaks.
7. Connect the chemical injection tube if applicable.

Image 2.4: Bottom view of the RMW22G24-EZ pump, illustrating the shaft connection area.

3. Operating Instructions

3.1 Priming the Pump:

Before starting the engine, it is crucial to prime the pump with water. Running the pump dry can cause severe damage to internal components.

1. Connect the water supply hose to the pump's inlet.
2. Turn on the water supply fully.
3. With the engine off, squeeze the trigger on the spray gun to allow water to flow through the pump and out the gun. This purges air from the system. Continue until a steady stream of water emerges from the spray gun, free of air bubbles.

3.2 Starting the Engine:

Once the pump is primed, follow your pressure washer engine's starting procedure. Ensure the engine is running smoothly before engaging the spray gun.

3.3 Adjusting Pressure and Chemical Injection:

• The pump includes a built-in pressure control valve. Adjust this valve to achieve the desired pressure for your cleaning task. Turning the valve counter-clockwise typically reduces pressure.
• For chemical application, ensure the chemical injection system is properly connected to your detergent container. The downstream injection system typically activates at low pressure settings.

Image 3.1: Diagram of pump connections, including the chemical injector and pressure adjustment points.

4. Maintenance

4.1 Regular Checks:

• Inspect all hoses and connections for leaks or damage before each use.
• Check the water inlet filter for debris and clean if necessary.
• Ensure the thermal relief valve is clear and functional.

4.2 Winterization/Storage:

Proper storage is essential to prevent damage, especially in freezing temperatures.

1. Disconnect all hoses and drain any remaining water from the pump.
2. Run pump saver or RV antifreeze through the pump according to product instructions to protect internal components from freezing and corrosion.
3. Store the pressure washer in a dry, temperature-controlled environment.

5. Troubleshooting

Common Issues and Solutions:

• No Pressure or Low Pressure:
  • Check water supply: Ensure it's fully open and unrestricted.
  • Air in pump: Re-prime the pump by squeezing the spray gun trigger until all air is purged.
  • Clogged inlet filter: Clean or replace the filter.
  • Worn nozzles: Replace worn or incorrect size nozzles.
  • Unloader valve issue: Inspect or adjust the unloader valve.
• Water Leaking from Pump:
  • Loose connections: Tighten all hose connections.
  • Damaged O-rings/seals: Inspect and replace any worn or damaged O-rings or seals.
  • Excessive pressure: Adjust the pressure control valve to reduce pressure. Excessive pressure can cause leaks or damage.
• Engine Stalls When Trigger is Released:
  • Unloader valve adjustment: The unloader valve may need adjustment or replacement if it's not properly bypassing water.

6. Specifications

Image 6.1: Detailed diagram of the RMW22G24-EZ pump with component labels and key specifications.

7. Warranty and Support

For warranty information and technical support, please contact AR Annovi Reverberi directly. It is recommended to retain your proof of purchase for any warranty claims. Always refer to the official product documentation for the most accurate and up-to-date warranty details.

Manufacturer: Annovi Reverberi

Brand: AR ANNOVI REVERBERI

For additional resources and product information, you may visit the official AR Annovi Reverberi store or contact their customer service department.