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FULLER O’BRIEN PRO 3515 - User Manual

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OWNER’S MANUAL
308-526
Rev A
This
manual contains
IMPORTANT
WARNINGS
and
INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
FULLER
O’BRIEN PRO
3515, 4020, 4030
Pressure W
ashers
PRO
3515, 5 HP ENGINE
P/N 800–584, Series A
1500 psi (103 bar) OPERA
TING PRESSURE
1900 psi (131 bar) MAXIMUM WORKING PRESSURE
PRO 4020, 8 HP ENGINE
P/N 800–585, Series A
2000 psi (138 bar) OPERA
TING PRESSURE
2400 psi (165 bar) MAXIMUM WORKING PRESSURE
PRO 4030, 1
1 HP ENGINE
P/N 800–586, Series A
3000 psi (207 bar) OPERA
TING PRESSURE
3400 psi (234 bar) MAXIMUM WORKING PRESSURE
FULLER
O’BRIEN CORPORA
TION, 450 EAST GRAND A
VENUE, SAN FRANCISCO, CA 94080
COPYRIGHT
1990, GRACO INC.
TM
PRO 4030
PRO 3515
PRO 4020

Table of Contents

Questions and Answers

  • J
    Jessica PerryAug 15, 2025
    How to fix a FULLER O’BRIEN Pressure Washer engine that won't start?
    • J
      Jessica PooleAug 15, 2025
      If your FULLER O’BRIEN Pressure Washer engine won't start, first, ensure there's gasoline in the fuel tank and the fuel shut-off valve is open. If the tank is full, check the oil level and add more if it's low. Make sure the Start/Stop switch is in the Start position. Also, consider draining the fuel tank and carburetor if there's water in the gasoline or if the fuel is old, and use new fuel and dry the spark plug. If the engine is flooded, clear out the gas by opening the choke and cranking the engine several times. Also, clean or replace a dirty air filter or spark plug. Finally, ensure the spray gun is not closed by triggering it.
  • B
    berryautumnAug 18, 2025
    What to do if my FULLER O’BRIEN PRO 3515 has low pressure and/or the pump runs rough?
    • M
      Michele JonesAug 19, 2025
      If you notice low pressure or the pump runs roughly on your FULLER O’BRIEN Pressure Washer, it could be due to several reasons. Start by checking the water flow rate to the pump to ensure there is an adequate water supply. Inspect the garden hose for any collapses or kinks that might be restricting the inlet. Clean the inlet filter, inlet and discharge valve assemblies and check the filter for any particles. Replace the high-pressure hose if it's leaking. If the tip is worn or the wrong size, replace it with a tip of the proper size. Replace worn valves and packings. If there's belt slippage, tighten or replace the belts, using correct belts and replacing both at the same time.
  • P
    Paul LeeAug 21, 2025
    Why does my FULLER O’BRIEN PRO 3515 Pressure Washer engine miss or lack power?
    • L
      lauriechambersAug 21, 2025
      If your FULLER O’BRIEN Pressure Washer engine misses or lacks power, start by removing and cleaning the air cleaner filter if it's partially plugged. Also, check the spark plug; if it's dirty, has the wrong gap, or is the wrong type, clean it, adjust the gap, or replace it.
  • S
    Sarah ClarkeAug 25, 2025
    What causes frequent or premature failure of the packings in my FULLER O’BRIEN PRO 3515 Pressure Washer?
    • H
      hernandezfredAug 25, 2025
      Frequent failure of the packings in your FULLER O’BRIEN Pressure Washer can be caused by several factors. Check the water temperature; it may not exceed 160F. Ensure you're not overpressurizing the pump by avoiding modifications to any factory–set adjustments. Clean or replace the tip if it's partially plugged or damaged. Never run the pump for more than 10 minutes without spraying, and do not run the pump without water. Install new plungers if the existing ones are scored, damaged, or worn. If there's abrasive material in the fluid being pumped, install proper filtration on the pump inlet plumbing.
  • C
    Charles SmithAug 27, 2025
    What causes water leakage from under the pump manifold in my FULLER O’BRIEN Pressure Washer?
    • A
      afowlerAug 28, 2025
      If you notice water leaking from under the pump manifold of your FULLER O’BRIEN Pressure Washer, it's likely due to worn packings. To resolve this, install new packings.
  • J
    Jeremiah StevensAug 30, 2025
    How to deal with water in the pump of my FULLER O’BRIEN Pressure Washer?
    • B
      Brittany MercerAug 30, 2025
      If you find water in the pump of your FULLER O’BRIEN Pressure Washer, it could be due to humid air condensing inside the crankcase, worn packings, or leaking oil seals. Address this by changing the oil as specified in MAINTENANCE, installing new packings, and installing new oil seals.
  • J
    John JacksonSep 2, 2025
    What causes strong surging at the inlet and low pressure on the discharge side of FULLER O’BRIEN PRO 3515?
    • L
      Linda WalkerSep 3, 2025
      Strong surging at the inlet and low pressure on the discharge side of your FULLER O’BRIEN Pressure Washer is usually caused by foreign particles in the inlet or discharge valve. Clean or replace the valves to resolve this issue.
  • A
    Andrew CarrSep 5, 2025
    What to do if there is oil leakage between the gear reducer cover and case of my FULLER O’BRIEN PRO 3515 Pressure Washer?
    • B
      Brandon ButlerSep 5, 2025
      If you observe oil leakage between the gear reducer cover and case of your FULLER O’BRIEN Pressure Washer, the cause is likely a worn gasket. Replace the gasket to fix this.
  • A
    Amy HoganSep 8, 2025
    Why is there oil leakage between the gear reducer cover and the pump in my FULLER O’BRIEN PRO 3515?
    • J
      James RichardsSep 8, 2025
      If you notice oil leakage between the gear reducer cover and the pump of your FULLER O’BRIEN Pressure Washer, it's likely due to worn oil seals and/or o-rings. To fix this, replace the oil seals and/or o-rings.
  • T
    Taylor RossSep 12, 2025
    What causes oil leakage between the gear reducer case and the engine in my FULLER O’BRIEN PRO 3515 Pressure Washer?
    • L
      Lori MedinaSep 12, 2025
      If you see oil leaking between the gear reducer case and the engine of your FULLER O’BRIEN Pressure Washer, it's probably due to a worn oil seal. Replace the oil seal to stop the leakage.

Summary

General Safety Warnings

Fluid Injection Hazard

Risks of high-pressure fluid injection and necessary precautions.

Moving Parts Hazard

Warns about pinch and amputation risks from moving parts.

Safety Hazards and Precautions

Equipment Misuse

Risks from improper use, modifications, and worn parts.

Hose Safety

Dangers of hose leaks, splits, ruptures, and connection safety.

Fuel and Emission Hazards

Precautions for refueling, fuel spills, and carbon monoxide.

Installation

Check for Shipping Damage

Inspect unit for damage incurred during shipping and notify carrier.

Set Up

Instructions for setting up the pressure washer, including chemical injectors.

Connect to Water Supply

Guidelines for connecting the unit to the water source, including pressure and temperature limits.

Startup Procedure

Pre-Startup Checks

Checking oil and fuel levels before starting the engine.

Starting the Engine

Step-by-step guide to starting the engine, including choke usage.

Post-Startup Precautions

Important cautions after starting, like engaging the safety latch and avoiding idling.

Trigger Safety Latch

Installing and Changing Spray Tips

Operation and Maintenance

Shutdown, Flushing, and Storage

Procedures for safely shutting down, flushing, and storing the pressure washer.

Pressure Relief Procedure

Steps to relieve pressure before shutdown or servicing.

Maintenance Schedule

Outlines daily, hourly, and periodic maintenance tasks and break-in period.

Troubleshooting Chart

Problem;Cause;Solution

Guide to diagnosing and resolving common operational issues.

Parts Drawing - PRO 3515

Diagram and Reference Numbers

Visual representation of parts with corresponding reference numbers for identification.

Parts List - PRO 3515

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the PRO 3515 model.

Parts Drawing - PRO 4020

Diagram and Reference Numbers

Visual representation of parts with corresponding reference numbers for identification.

Parts List - PRO 4020

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the PRO 4020 model.

Parts Drawing - PRO 4030

Diagram and Reference Numbers

Visual representation of parts with corresponding reference numbers for identification.

Parts List - PRO 4030

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the PRO 4030 model.

Gear Reducer Parts Drawing (PRO 3515)

Diagram and Reference Numbers

Visual representation of gear reducer parts for PRO 3515 with reference numbers.

Gear Reducer Service (PRO 3515)

Replacing Components

Procedures for replacing O-rings, gaskets, and oil seals in the gear reducer.

Assembling the Gear Reducer

Steps for correctly reassembling the gear reducer after servicing.

Gear Reducer Parts Drawing (PRO 4020)

Diagram and Reference Numbers

Visual representation of gear reducer parts for PRO 4020 with reference numbers.

Gear Reducer Service (PRO 4020)

Replacing Components

Procedures for replacing gaskets, oil seals, and O-rings in the gear reducer.

Assembling the Gear Reducer

Steps for correctly reassembling the gear reducer after servicing.

Pump Assembly Parts Drawing (1500 psi)

Diagram and Reference Numbers

Visual representation of the 1500 psi pump assembly parts with reference numbers.

Pump Assembly Parts List (1500 psi)

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the 1500 psi pump assembly.

Pump Assembly Parts Drawing (2000 psi)

Diagram and Reference Numbers

Visual representation of the 2000 psi pump assembly parts with reference numbers.

Pump Assembly Parts List (2000 psi)

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the 2000 psi pump assembly.

Pump Assembly Parts Drawing (3000 psi)

Diagram and Reference Numbers

Visual representation of the 3000 psi pump assembly parts with reference numbers.

Pump Assembly Parts List (3000 psi)

Component Descriptions and Quantities

Detailed list of parts, part numbers, and quantities for the 3000 psi pump assembly.

Pump Service

Servicing Plungers and Valves

Procedures for servicing pump plungers and valves, including component replacement.

Pumping Section Service

Instructions for disassembling and servicing the pump's manifold and crankcase.

V-Packing Service

Accessories and Technical Data

Available Accessories

Descriptions of optional accessories like chemical injectors and backflow preventors.

Model Specifications

Table detailing specifications for models 800-584, 800-585, and 800-586.

Graco Warranty Information

Warranty Terms and Disclaimers

Details Graco's warranty terms, limitations, exclusions, and disclaimers.

Equipment Not Covered

Specifies equipment and components not included under Graco's warranty.

Important Phone Numbers

Contact numbers for placing orders and obtaining technical assistance.

FULLER O’BRIEN PRO 3515 Specifications

General IconGeneral
BrandFULLER O’BRIEN
ModelPRO 3515
CategoryPressure Washer
LanguageEnglish

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