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Simpson PS4240 - User Manual

Simpson PS4240
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INSTRUCTION
MANUAL
MANUAL DE
INSTRUCCIONES
Part No. 7105325 Rev. 3 FEB2016
If your pressure washer is not working properly or if there are parts missing or broken,
please DO NOT RETURN IT TO THE PLACE OF PURCHASE. Contact our customer
service department at
1-877-362-4271 or www.simpsoncleaning.com
Si su lavadora a presión no trabaja correctamente ó encuentra partes rotas
ófaltantes, por favor NO LA REGRECE AL LUGAR DONDE LA COMPRO.
Contáctese con nuestro Departamento de Servicio al Cliente llamando al
1-877-362-4271 o www.simpsoncleaning.com
SAVE THIS MANUAL FOR FUTURE REFERENCE
4200 PSI
4.0 GPM
IMPORTANT: Please make certain that the person who is to use this equipment carefully
reads and understands these instructions before operating.
IMPORTANTE: Aségurese por favor de que la persona que vaya a utilizar este equipo lea
con cuidado y comprenda estas instrucciones antes de operar.
VEA EL ESPAÑOL EN LA CONTRAPORTADA. INSTRUCTIVO DE OPERACIÓN,
CENTROS DE SERVICIO Y PÓLIZA DE GARANTÍA. ADVERTENCIA:
LÉASE ESTE INSTRUCTIVO ANTES DE USAR EL PRODUCTO.
PROFESSIONAL PRESSURE WASHER
MODEL
MODELO
PS4240H

Table of Contents

Questions and Answers

  • A
    Anna HarveyJul 29, 2025
    Why is my Simpson PS4240 Pressure Washer not producing high pressure?
    • S
      Sandy RichardsonJul 30, 2025
      If your Simpson Pressure Washer has no or low pressure upon initial use, several factors could be the cause. Ensure the spray wand is set to high pressure. Verify that the water supply provides at least 5 gpm at 20 PSI. Check for leaks at the high-pressure hose fitting and repair them, applying sealant tape if needed. Inspect the nozzle for obstructions, and clean the water filter screen if it's clogged. Remove any air in the hose by disconnecting the water source, turning it on until a steady stream appears, then reconnecting and squeezing the trigger. Also, make sure the choke is not in the “Choke” position and that you are using a high-pressure hose under 100 feet (30 m).
  • M
    Monica RussellAug 6, 2025
    What to do if my Simpson Pressure Washer won't draw chemicals?
    • E
      Elizabeth WalterAug 6, 2025
      If your Simpson Pressure Washer isn't drawing chemicals, start by ensuring the spray wand is in the low-pressure setting. Check the chemical filter for clogs and clean it if necessary. Make sure the end of the detergent siphon hose is fully submerged in the cleaning solution. If the chemical is too thick, dilute it to the consistency of water. Use a longer water supply hose instead of a high-pressure hose.
  • A
    andrewcollinsAug 13, 2025
    Why is oil leaking from the pump of my Simpson PS4240 Pressure Washer?
    • D
      Dawn WalterAug 13, 2025
      If you notice oil leaking from the pump of your Simpson Pressure Washer, several issues could be the cause. Start by tightening the loose drain plug. Inspect and replace worn drain plug o-rings and fill plug o-rings. Ensure the pump is not overfilled and that the correct type of oil is used. Clean the vent plug by blowing air through it to remove any blockages, and replace it if the problem persists. Also, check if the air filter is filled with oil and clean or replace the filter element.
  • K
    Karen SchroederAug 20, 2025
    How to fix a water leak at the gun/spray wand connection on my Simpson PS4240?
    • S
      Shannon WilliamsAug 20, 2025
      To fix a water leak at the gun/spray wand connection of your Simpson Pressure Washer, first, check for worn or torn o-rings and replace them if necessary. Also, ensure that the hose connection is not loose and tighten it.

Summary

Important Safety Instructions

DANGER: Carbon Monoxide Hazard

Engine exhaust contains deadly carbon monoxide gas; operate only outdoors.

WARNING: Read Manuals Before Operation

Read manuals before operation; contact customer service for questions.

DANGER: Injection or Severe Injury Risk

Keep clear of nozzle; do not spray people or animals; use only by trained operators.

WARNING: California Proposition 65 Chemicals

Product exhaust and cleaning products contain chemicals known to cause cancer/birth defects.

DANGER: Risk of Explosion or Fire

Fuel Ignition Hazards

Gasoline vapors can ignite from sparks or hot engine parts.

Fuel Expansion and Fire Risk

Heat expands fuel, causing spillage and potential fire/explosion.

Explosive Environment Operation

Operating in explosive environments risks fire.

Muffler Heat and Material Damage

Muffler heat can damage surfaces, melt materials, and harm plants.

Improper Fuel Storage Risks

Improperly stored fuel can lead to accidental ignition or access by children.

Chemical Hazards During Use

DANGER: Risk to Breathing (Asphyxiation)

Carbon Monoxide Hazard

Engine exhaust contains deadly carbon monoxide; operate only outdoors.

Cleaning Fluid Hazards

DANGER: Risk of Fluid Injection and Laceration

High-Pressure Fluid Injection

High-pressure spray can penetrate flesh, causing amputation or serious injury.

Hose Leak and Injection Injury

Leaks from damaged hoses can cause injection injuries. Do not treat as a cut.

System Pressure During Maintenance

Safe Spraying Practices

Never point nozzle at self/others, ensure hose/fittings are secure, avoid muffler contact.

Accessory Length and Pressure Relief

DANGER: Risk of Injury from Spray

High-Velocity Spray Hazards

High-speed spray can break objects and create projectiles. Wear safety glasses.

Unsecured Object Projectile Hazards

DANGER: Risk of Unsafe Operation

General Unsafe Operation Risks

Unsafe operation can lead to serious injury or death. Follow all safety guidelines.

Starting Procedure Kickback

Improper starting can cause kickback, leading to hand/arm injury. Follow correct procedure.

Spray Gun as Toy Hazard

Reactive Force and Slipping

Reactive force can cause kickback, slipping, or misdirection. Grip firmly with both hands.

DANGER: Risk of Injury or Property Damage During Transport;Storage

Fuel;Oil Leak Hazards

Upright Storage Importance

DANGER: Risk of Electrical Shock

Electrical Hazard from Spray

Spray directed at electrical outlets/switches can cause fatal shock.

DANGER: Risk of Chemical Burn

Chemical Hazard from Use

Using acids, toxic, or flammable solvents can cause serious injury or death.

WARNING: Risk of Bursting

Tire Over-Inflation Hazard

High-Velocity Spray on Tires

WARNING: Risk of Hot Surfaces

Contact Burn Hazard

WARNING: Risk of Injury from Lifting

Heavy Lifting Hazard

Quick Setup Guide

Quick Start Guide

Start the Engine

Assembly Instructions

Operation

Pump Overheating Warning

Warning against running the unit without trigger pull to prevent pump damage.

Pressure Adjustments

How to Use Spray Wand

Pressure Adjustment Knob

Changing Nozzles

How to Apply Chemicals;Cleaning Solvents

Starting Procedure

Safety Precautions for Starting

Warnings about injury risks during the starting process.

Starting Procedure and Safety

Pre-Start Safety Warnings

Covers injection injury, carbon monoxide, fire risks, and proper fueling.

Fuel and Oil Checks

Connecting and Operating

Final Starting and Operation Steps

Maintenance

Pump Oil Check and Change

Pump Oil Change and Nozzle Cleaning

Changing Pump Oil

Troubleshooting Guide

Engine Starting Issues

Common causes and solutions for the engine not starting.

Troubleshooting: Pressure and Chemicals

Low Pressure Issues

Chemical Draw Issues

Troubleshooting: Leaks and Pulsation

Low Pressure After Use

Leak Detection and Repair

Pump Pulsation and Oil Leaks

Simpson PS4240 Specifications

General IconGeneral
Power SourceGasoline
Max Pressure4200 PSI
Flow Rate4.0 GPM
Pump TypeTriplex
Hose Length50 ft
Nozzles Included0°, 15°, 25°, 40° and Soap
WheelsPneumatic

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