Delta DTH2450-1 - User Manual

Questions and Answers

S
shawjoshuaAug 4, 2025
What causes water leaking at the pump of Delta DTH2450-1?
- C
  Cassie JacksonAug 4, 2025
  If water is leaking at the pump of your Delta Pressure Washer, check for loose connections and tighten them.
V
vcollinsAug 9, 2025
Why Delta DTH2450-1 engine will not start?
- P
  Paul CarlsonAug 9, 2025
  If your Delta Pressure Washer engine won't start, it could be due to several reasons: * There's no fuel. Add fuel. * The choke lever is in the “No Choke” position. Move it to the “Choke” position. * The spark plug wire isn't attached. Attach it. * The engine ON/OFF switch is in the OFF position. Place it in the ON position. * The choke lever is in the “Choke” position on a hot engine. Move it to the “No Choke” position. * The fuel valve is closed. Move the fuel valve lever to the “Open” position.
J
John CookAug 14, 2025
What to do if Delta Pressure Washer will not draw chemicals?
- C
  Clifford BergerAug 14, 2025
  If your Delta Pressure Washer isn't drawing chemicals, here are a few things to check: * Ensure the spray wand is set to low pressure. * The chemical filter may be clogged. Clean it. * Make sure the end of the chemical hose is fully submerged in the cleaning solution. * The chemical might be too thick. Try diluting it. * The pressure hose could be too long. Use a longer water supply hose instead.
B
Bryan GarciaAug 25, 2025
What causes water leaking at gun/spray wand connection of Delta DTH2450-1 Pressure Washer?
- J
  Julia GarciaAug 25, 2025
  If you notice water leaking at the gun/spray wand connection of your Delta Pressure Washer, it could be due to: * A worn or broken o-ring. Check and replace it if necessary. * A loose hose connection. Tighten the connection.
Z
zloganAug 29, 2025
Why does my Delta DTH2450-1 Pressure Washer pump pulsate?
- S
  Sharon FoxAug 30, 2025
  If your Delta Pressure Washer pump pulsates, the following issues require attention from an Authorized Warranty Service Center (AWSC): * Piston packings worn. * Worn or broken o-rings. * Pump head or tubes damaged from freezing. Also, check if the nozzle is obstructed.
K
Kevin RichardsonSep 10, 2025
What to do if Delta DTH2450-1 Pressure Washer has no or low pressure after normal use?
- J
  Jason RossSep 12, 2025
  If your Delta Pressure Washer has no or low pressure after a period of normal use, the following issues require attention from an Authorized Warranty Service Center (AWSC): * Worn seal or packing. * Worn or obstructed valves. * Worn unloader piston. * Worn E-Z start valve.

Summary

Safety Guidelines and Definitions

Definitions of Safety Symbols

Explains DANGER, CAUTION, WARNING symbols for hazard identification.

Consumer Safety Information

Covers product regulations and spark arrester requirements, especially for California.

Important Safety Instructions

Read and Save Instructions

Emphasizes the importance of reading and retaining the manual for future reference.

Hazard: Risk of Explosion or Fire

Details potential fire hazards and prevention methods related to fuel and operation.

Hazards: Breathing and Fluid Injection Risks

Hazard: Risk to Breathing

Discusses dangers of exhaust fumes and cleaning fluids to respiratory health.

Hazard: Risk of Fluid Injection

Warns about high-pressure fluid injection injuries and necessary immediate medical attention.

Hazards: Chemical, Electrical, and Thermal Risks

Hazard: Risk of Chemical Burn

Details risks associated with chemical usage and preventative measures.

Hazard: Risk of Electrical Shock

Warns about electrical shock hazards and how to avoid them.

Hazard: Risk of Hot Surfaces

Alerts users to burn risks from hot engine parts and exhaust components.

Hazards: Unsafe Operation and Spray Injury

Hazard: Risk of Unsafe Operation

Addresses general unsafe practices and their consequences, including kickback.

Hazard: Risk of Injury From Spray

Focuses on projectile hazards from spray and necessary safety gear.

Carton Contents and Assembly

List of Included Items

Itemizes all parts included in the packaging for assembly.

Assembly Instructions

Step-by-step guide for assembling the pressure washer components.

Engine Oil Addition

Guidance on adding engine oil before initial use as per manual.

Operating Instructions Overview

Basic Elements of a Pressure Washer

Identifies and describes key components of the pressure washer unit.

Basic Elements of an Engine

Explains the function of essential engine controls and parts.

Pressure Washer Terminology

Defines key terms like PSI, GPM, and CU for understanding specifications.

Operating Features and Pre-Start Warnings

Pressure Adjustments

Details methods for lowering pressure by adjusting distance or nozzle spray.

Warnings Before Starting Unit

Crucial safety warnings for high-pressure spray, fueling, and ventilation.

Bypass Mode and Hose Warnings

Cautions on bypass mode duration and hose contact with hot surfaces.

Using the Spray Wand and Chemicals

How to Use Spray Wand

Explains selecting high/low pressure and adjusting spray patterns.

How to Apply Chemicals and Solvents

Step-by-step guide for applying cleaning solutions and rinsing the system.

Surface Damage Caution

Warns about potential surface damage from high-pressure spray and advises pre-checks.

Starting and Shutting Down Procedures

Starting the Pressure Washer

Covers fueling, oil check, water connection, and engine start.

Shutting Down the Unit

Details procedures for rinsing, engine shutdown, and pressure relief.

Maintenance and Cleaning

General Maintenance Precautions

Safety warnings before performing any maintenance or repair.

Nozzle Cleaning Procedure

Detailed steps for cleaning a clogged nozzle using provided tools.

Water Inlet Filter Cleaning

Instructions on how to check and clean the water inlet filter screen.

Storage and Pump Protection

Storing the Pressure Washer

Instructions for draining hoses, gun, and storing components safely.

Pump Protector;Winterizer

Recommends using pump protector or RV antifreeze for storage and includes the procedure.

Troubleshooting Guide

Engine Starting Issues

Lists common causes and corrections for when the engine will not start.

Initial Pressure Problems

Addresses issues causing no or low pressure during initial operation.

Hose Length and Pressure

Explains how hose length can affect pressure and provides a recommendation.

Additional Troubleshooting

Chemical Draw Problems

Identifies issues preventing the unit from drawing cleaning solutions.

Pressure Loss After Use

Diagnoses causes for pressure loss after a period of normal operation.

Water Leaks and Pump Pulsation

Addresses leaks at gun/wand connection, pump, and causes of pump pulsation.

Warranty Information

Warranty Terms and Coverage

Outlines the warranty coverage periods for different product components.

Purchasers Warranty Claim Responsibilities

Details what the original purchaser must do to process a warranty claim.

Warranty Exclusions

Lists common exclusions from the product warranty coverage.

This document is an instruction manual for a DELTA 5.5 Horsepower Pressure Washer, model DTH2450, with 5880 Cleaning Units. The manual provides essential information for safe operation, assembly, maintenance, and troubleshooting of the device.

Function Description:

The DELTA DTH2450 is a gasoline-powered pressure washer designed for cleaning various surfaces. It utilizes a high-pressure pump driven by a 5.5 horsepower engine to deliver pressurized water, which can be mixed with cleaning agents for enhanced effectiveness. The unit is designed for consumer applications, specifically personal residential household usage.

Important Technical Specifications:

Engine: 5.5 Horsepower
Cleaning Units (CU): 5880 (calculated as GPM x PSI)
Pressure (PSI): 2450 Pounds per Square Inch (preset at the factory for optimum pressure and cleaning)
Flow Rate (GPM): 2.4 Gallons Per Minute
Water Supply Requirements: Minimum 20 PSI and 5 gallons per minute
Fuel: Fresh, high-quality, unleaded gasoline with a pump octane rating of 86 or higher.
Engine Oil: Specific type and quantity as per the Engine Owners Manual.
High Pressure Hose Length: Recommended to be under 100 feet for optimal performance.

Usage Features:

Multi-Adjustable Spray Wand: This key feature allows users to switch between high and low pressure settings and adjust the spray pattern.
- High Pressure Setting: Used for cleaning and rinsing. The spray pattern can be adjusted from a 0° pencil stream (most concentrated and powerful) to a 40° wide-angle fan spray (less concentrated, for broader coverage). To engage high pressure, the nozzle of the multi-adjustable spray wand is pulled back.
- Low Pressure Setting: Used for applying chemicals or cleaning solutions. To engage low pressure, the nozzle is extended.
- Pressure Adjustment: While the pump pressure is factory preset, users can effectively lower the pressure by backing away from the surface or by widening the fan spray using the adjustable nozzle. It is explicitly stated that users should NOT attempt to increase pump pressure beyond the factory setting, as this may damage the pump.
Chemical Injection System: The pressure washer includes a chemical hose that feeds cleaning agents into the pump, mixing them with water to improve cleaning effectiveness.
- Application: Chemicals are applied in the low-pressure setting.
- Chemical Type: Only household detergents, cleaners, and degreasers specifically recommended for pressure washer use should be used. Acids, gasoline, kerosene, bleach, or other corrosive/flammable materials are strictly prohibited.
- Dilution: For every 7 gallons of water pumped, 1 gallon of chemical/cleaning solution will be used.
- Rinsing: After chemical use, the system must be thoroughly rinsed by drawing clean water through the chemical hose to prevent damage to the pump from chemical residue.
Engine Controls: The unit incorporates standard engine controls such as a choke control, starter grip, fuel valve lever, and engine switch, whose operation is detailed in the separate Engine Owners Manual.
Safety Features:
- Trigger Lock: The spray gun includes a trigger lock to prevent accidental operation when the wand is not in service.
- Bypass Mode: The pump enters bypass mode when the gun trigger is not pulled, recirculating water within the pump. However, prolonged operation (more than two minutes) in bypass mode can cause overheating and damage to the pump.
- Water Inlet Filter: A screen filter at the water inlet prevents foreign matter from entering and damaging the pump.

Maintenance Features:

Routine Maintenance: A routine maintenance schedule is recommended for efficient operation and longer life, with more frequent checks needed under unusual conditions (high temperatures, dusty environments).
Engine Maintenance: Refer to the Engine Owners Manual for all engine-related maintenance.
Pump Maintenance: The pump is maintenance-free and does not require oil. In case of problems, contact an Authorized Service Center.
Nozzle Cleaning: If the nozzle becomes clogged, leading to excessive pressure or pulsating pump pressure, it needs to be cleaned.
- Procedure: Shut off the unit and water supply, disconnect the spark plug wire, relieve water pressure by pulling the gun trigger, disconnect the wand from the gun, remove the nozzle using the provided 2mm Allen wrench, clean the nozzle with the nozzle cleaner or a straightened paper clip, and backflush with water for 30 seconds. Then reassemble and test.
Water Inlet Filter Cleaning: The screen filter should be checked periodically and cleaned.
- Procedure: Remove the filter by grasping its end, clean it by flushing with water on both sides, and re-insert it with the cone side facing out. Operating the pressure washer without a properly installed filter is prohibited.
Storage:
- Engine Storage: Refer to the Engine Owners Manual.
- Pump Storage: For storage longer than 30 days or when freezing temperatures are expected, a pump protector/winterizer is recommended. Alternatively, RV antifreeze can be used.
  - RV Antifreeze Procedure: Obtain a funnel, six ounces of RV antifreeze, and a 16-36 inch garden hose with a male connector. Disconnect the spark plug wire, connect the garden hose to the pump's water inlet, add RV antifreeze to the hose, and slowly pull the engine starter rope several times until antifreeze comes out of the high-pressure hose connection. Then remove the garden hose and reconnect the spark plug wire. Only RV antifreeze should be used, as other types can be corrosive. Windshield washer fluid may also be used.
- Pressure Washer Storage: Drain all water from the high-pressure hose, coil it, and store it in the handle's cradle. Drain all water from the spray gun and wand by holding the gun vertically with the nozzle pointing down and squeezing the trigger, then store it in the gun holder. Store the chemical hose to protect it from damage.

Safety Guidelines:

The manual emphasizes critical safety warnings, including risks of explosion/fire (due to spilled fuel, hot engine components, flammable liquids), breathing hazards (exhaust fumes, cleaning fluid vapors), fluid injection (high-pressure spray can penetrate flesh), chemical burns (from improper cleaning agents), electrical shock (spraying electrical outlets), hot surfaces (engine exhaust), and injury/property damage during transport/storage (fuel/oil leaks). Users are instructed to wear ANSI approved Z87 safety glasses and protective clothing, avoid pointing the wand at people or animals, secure the trigger lock, and never permanently secure the trigger in the open position.