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DeVilbiss GFG-517 - User Manual

DeVilbiss GFG-517
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EN
SB-2-179-G (8/2015) 1 / 8
SERVICE MANUAL
GFG
TM
GRAVITY PRO
TM
MODEL GFG-517
CONVENTIONAL SPRAY GUN
DESCRIPTION
The GFG-517 is a general purpose, heavy
duty, high production spray gun suitable for
use with most types of materials. The fluid
tip and needle and internal fluid passages
are stainless steel.
Note
This gun includes 300 series
stainless steel fluid passages and
400/300 S.S. series tip and needle.
Guns may be used with chlorinated
solvent materials. The gravity cup
must also be compatible for use
with chlorinated solvent materials
(GFC-501 Acetal).
IMPORTANT: This gun is designed for use
with mildly corrosive and non-abrasive
materials. If used with other high corrosive
or abrasive materials, it must be expected
that frequent and thorough cleaning will be
required and the necessity for replacement
of parts will be increased.
Note
The GFC gravity feed cups are
included with the gun as part of
the GFG-618 gun and cup kits. See
Accessories on page 6 for more
information.
INSTALLATION
1. Attach the air supply line to the air
inlet (18). An air transformer installed
as close as possible to the gun will
provide filtered and regulated air.
Note
When larger diameter air hoses
are used, it is advisable to use an
8' or 10' "whip end" or a smaller di-
ameter hose at the gun for greater
flexibility or movement.
2. Attach the gravity feed cup to the
material inlet.
Note
Protective coating and rust inhibi-
tors have been used to keep the
gun in good condition prior to
shipment. Before using the gun,
flush it with solvents so that these
materials will be removed from
fluid passages.
OPERATION
Mix, prepare and strain the material to be
sprayed according to the paint manufac-
turer's instructions.
Strain material through a 60 or 90 mesh
screen.
1. Fill the gravity feed cup with the ma-
terial. Do not overfill. Make sure that
the cup lid vent hole is clear.
2. Turn on the air at the source of supply.
Adjust the atomization air pressure to
35 psi.
3. Open the spreader adjustment valve
(19) (Fan) by turning the valve stem
counter-clockwise.
4. Close the fluid needle adjusting screw
(25) by turning clockwise.
5. Spray a test area by turning the fluid
needle adjusting screw (25) counter-
clockwise until a full coat is obtained.
If the finish is too sandy and dry, the mate-
rial flow may be too low for the atomization
air pressure being used.
If the finish sags, there is too much material
flowing for the atomization air pressure
being used.
Both of the above can be corrected by in-
creasing or decreasing the atomization air
pressure or the material flow. Pattern width
can be altered by turning the spreader
adjustment valve (19), either clockwise to
decrease the width or counter-clockwise
to increase the width.
IMPORTANT: Before using this
equipment, read all safety precautions
and instructions. Keep for future use.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to clean
cap holes, use a broom straw or toothpick.
Never use a wire or hard instrument. This
may scratch or burr holes causing a dis-
torted spray pattern.
To clean fluid passages, remove excess
material from cup, then flush with a suitable
solvent. Wipe gun exterior with a solvent
dampened cloth. Never completely im-
merse in solvent as this is detrimental to
the lubricants and packings.
Note
When replacing the fluid tip or fluid
needle, replace both at the same
time. Using worn parts can cause
fluid leakage. Tip and needle sets
are available. See Chart 2. Also,
replace the needle packing at this
time. Lightly lubricate the threads
of the fluid tip before reassembling.
Torque to 12-15 ft. lbs. Do not
overtighten the fluid tip.
To prevent damage to the fluid tip (2)
or fluid needle (2), be sure to either
1) pull the trigger and hold while
tightening or loosening the fluid tip
or 2) remove fluid needle adjusting
screw (25) to relieve spring pressure
against needle collar.
SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10* spray gun
lube at trigger bearing stud (15) and the
stem of the air valve (10) where it enters
the air valve assembly (13). The shank of
the fluid needle (2) where it enters the pack-
ing nut (6) should also be oiled. The fluid
needle packing (5) should be lubricated
periodically. Make sure the baffle (4) and
retaining ring (1) threads are clean and
free of foreign matter. Before assembling
retaining ring to baffle, clean the threads
thoroughly, then add two drops of SSL-10
spray gun lube to threads. The fluid needle
spring (22) and air valve spring (11) should
be coated with a very light grease, making
(Continued on page 3)

Table of Contents

Questions and Answers

  • J
    james80Jul 30, 2025
    How to prevent excessive overspray with my DeVilbiss GFG-517 Paint Sprayer?
    • C
      Carolyn RichardsJul 30, 2025
      If your DeVilbiss Paint Sprayer produces excessive overspray, reduce the atomization air pressure. Adjust the distance to the work surface. Move the gun at a moderate pace, keeping it parallel to the surface.
  • M
    Martin GuerreroAug 4, 2025
    What to do if my DeVilbiss GFG-517 Paint Sprayer has a jerky or fluttering spray?
    • G
      Gerald PriceAug 4, 2025
      To address a jerky or fluttering spray from your DeVilbiss Paint Sprayer, tighten or replace a loose or damaged fluid tip/seat. Refill the material if the level is too low, and hold the container more upright. Clear any obstructions in the fluid passage by backflushing with solvent. Lubricate or tighten a dry or loose fluid needle packing nut.
  • W
    williamsstephanieAug 8, 2025
    What to do if my DeVilbiss GFG-517 Paint Sprayer will not spray?
    • R
      Robert GonzalezAug 8, 2025
      If your DeVilbiss Paint Sprayer will not spray, verify there is air pressure at the gun and blow out the gun's air passages. Ensure the fluid needle adjusting screw is sufficiently open. If using gravity feed, thin the material or switch to a larger tip size.
  • J
    Jennifer KochAug 12, 2025
    What to do if my DeVilbiss GFG-517 is leaking fluid from the front?
    • S
      Steven Porter MDAug 12, 2025
      To fix fluid leaking or dripping from the front of your DeVilbiss Paint Sprayer, adjust a packing nut that is too tight and lubricate dry packing. Replace a worn or damaged fluid tip and needle with lapped sets. Clean any foreign matter from the tip and replace a broken fluid needle spring. Replace an incorrectly sized needle or tip.
  • R
    Robert ReedAug 16, 2025
    How to fix runs and sags with my DeVilbiss GFG-517?
    • T
      Tyler BrownAug 16, 2025
      To correct runs and sags when using your DeVilbiss Paint Sprayer, adjust the gun or reduce fluid flow if there's too much material flow. Mix the material properly or apply light coats if the material is too thin. Hold the gun at a right angle to the work and adapt to proper gun technique.
  • C
    Corey MccarthyAug 21, 2025
    How to stop fluid leaking from the packing nut on my DeVilbiss GFG-517 Paint Sprayer?
    • S
      sarah33Aug 21, 2025
      To address fluid leaking from the packing nut of your DeVilbiss Paint Sprayer, tighten the nut, being careful not to bind the needle. If the packing is worn or dry, replace or lubricate it.
  • D
    Daniel JonesAug 25, 2025
    What to do if my DeVilbiss GFG-517 Paint Sprayer's cup is leaking from the bottom?
    • B
      Bradley MathisAug 26, 2025
      If you're experiencing fluid leaking or dripping from the bottom of the cup of your DeVilbiss Paint Sprayer, tighten the cup on the gun. Replace the washer if it's worn or missing below the cup, and clean the cup threads.

Summary

Installation Instructions

Spray Gun Operation Guide

Preventive Maintenance Procedures

Spray Gun Lubrication

Safety Precautions and Hazard Identification

Fire Hazards and Safeguards

Solvent Spray Hazards and Eye Protection

Toxic Substance Inhalation and Skin Contact

Explosion Risk from Incompatible Materials

General Safety and Operational Guidelines

Cumulative Trauma Disorders (CTDs)

CTD Causes and Risk Factors

CTD Symptoms and Prevention

Parts Replacement Procedures

Troubleshooting Common Issues

Spray Pattern Defects and Corrections

Addresses issues like heavy/light patterns, split spray, dry spray, and provides corrective actions.

Material Flow and Leakage Problems

Covers paint bubbles, fluid leaking from cup or packing nut, and starved spray patterns.

Advanced Troubleshooting and Notes

Runs, Sags, and Finish Imperfections

Diagnoses causes and solutions for runs, sags, sandy finish, and orange peel.

DeVilbiss GFG-517 Specifications

General IconGeneral
TypeGravity Feed
Air CapGFG-517
Pattern WidthUp to 12 inches
Air Inlet Thread1/4" NPS (M)
Air Inlet1/4" NPS (M)

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