Troubleshooting6-4 1997 Nordson CorporationAll rights reserved106 915CIssued 11/97Manual 21-27Figure 6-1 shows some common spray pattern faults of the WM-1 spraygun. Troubleshooting procedures for these and other common film-buildfaults are listed in Table 6-1. If you cannot solve your problems with theinformation given here, contact your local Nordson representative forhelp.2127021AÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ1 2 3 4 5 76Fig. 6-1 Common spray pattern faults1. Blown pattern2. Heavy bottom pattern3. Heavy top pattern4. Heavy left side pattern5. Heavy right side pattern6. Heavy center pattern7. Spitting patternTable 6-1 Spray Pattern/Film Fault CorrectionsSpray Pattern/FilmFaultsCorrective ActionBlown pattern Reduce pattern/horn air; increase coating material pressure.Heavy top or heavybottomRotate air cap and trigger spray gun; if problem exists, clean air cap; if problem doesnot exist, clean fluid tip or replace air cap; change coating material mixture ifnecessary.Heavy left side or heavyright sideRotate air cap and trigger spray gun; if problem exists, clean air cap; if problem doesnot exist, clean fluid tip or replace air cap; change coating material mixture ifnecessary.Heavy center Increase atomizing air, increase pattern/horn air, or reduce coating material viscosity.Spitting Purge air bubbles in fluid line; adjust puller; raise atomizing air and fluid pressure;increase pattern/horn air; raise coating material temperature.Runs and sags Purge air bubbles in fluid line; adjust puller; raise atomizing air and fluid pressure;move farther from substrate, increase pattern/horn air; raise coating materialtemperature.Dry spray Reduce atomizing air; move closer to substrate; reduce pattern air; change coatingmaterial mixture.Poor or no wrap Check electrostatic power supply; clean spray gun; remove water from supply air;check substrate ground; remove spray gun grounding path.Poor coverage inrecessesRaise atomizing air and coating material pressure; reduce electrostatic power supplyvoltage; move closer to substrate.3. Spray Pattern Faults

Issued

Introduction

Qualified Personnel

Installation

Operation

Less-Obvious Dangers

Action in the Event of a System or Component Malfunction

Manual

Material and Solvent Precautions

Disposal

Connections and Controls

Standard Nozzle Installation

Nordson Air and Fluid Hose Installations

Preparation

Spraying the Substrate

Troubleshooting 1. Introduction

Troubleshooting Procedures

Spray Pattern Faults

Repair 1. Introduction

Disassembly

Packing Cartridge and Fluid Needle

Air Valve

Assembly

Final Assembly

Parts 1. Introduction

WM-1 Manual Waterborne Air Spray Gun without Hoses

Tools Illustration for WM-1 Manual Waterborne Air Spray Gun without Hoses

WM-1 Manual Waterborne Air Spray Gun with Hoses

Tools Illustration for WM-1 Manual Waterborne Air Spray Gun with Hoses

Kit Parts List

Air Valve Service Kit

Fluid Seal Service Kit

Fluid and Air Seal Service Kits Illustration

Accessory Parts List

Fluid and Grounded Air Hose Accessories Illustration

specifications

declaration of conformity

Nordson WM-1 Customer Product Manual

WM-1