Dewalt Dwmt70778 User manual

DWMT70778

Gravity Feed Touch-Up Spray Gun

INSTRUCTION MANUAL

English

A. Spray Gun Cup

B. Material Filter

C. Air Cap

D. Horns

E. Trigger

F. Air Volume Control Knob

SPECIFICATIONS

MODEL

DWMT70778

FEED TYPE

Gravity

NOZZLE SIZE

0.8MM

CUP CAPACITY

8.8Oz. (250ML)

PATTERN LENGTH

>3.5" (90MM)

MIN. WORKING PRESSURE

30PSI

MAX. WORKING PRESSURE

60PSI

AVERAGE AIR CONSUMPTION

@50PSI

4.1 SCFM (2.0 L/s)

1.4 CFM (0.67 L/s)

NET WEIGHT

0.75 LBS (0.34Kg.)

AIR INTLET SIZE

1/4" NPS(M)

RECOMMENDED HOSE SIZE

3/8" (10MM)

DWMT70778

GRAVITY FEED TOUCH-UP SPRAY GUN

G. Air Inlet

H. Pattern Control Knob

I. Fluid Control Knob

J. Hook

K. Spray Gun Cup Lid

L. Air Valve Nut

FIG.1

FIG.2

Denitions: Safety Guidelines

The definitions below describe the level of severity

for each signal word. Please read the manual and pay

attention to these symbols.

DANGER: Indicates an imminently hazardous

situation which, if not avoided, will result in death

or serious injury.

WARNING: Indicates a potentially hazardous

situation which, if not avoided, could result in death

or serious injury.

CAUTION: Indicates a potentially hazardous

situation which, if not avoided, may result in minor

or moderate injury.

CAUTION: Used without the safety alert symbol

indicates a potentially hazardous situation which,

if not avoided, may result in property damage.

IMPORTANT SAFETY INSTRUCTIONS

WARNING: This product contains chemicals, known to the State

of California to cause cancer, and birth defects or other

reproductive harm. Wash hands after handling.

SAVE THESE INSTRUCTIONS

WARNING:

Improper operation or maintenance of this product

could result in serious injury and property damage.

Read and understand all warnings and operating

instructions before using this equipment. When using

air tools, basic safety precautions should always be

followed to reduce the risk of personal injury.

WARNING:

Read and understand this instruction manual and tool labels

before installing, operating or servicing this tool. Keep these

instructions in a safe accessible place.

Operators and others in work area must wear ANSI Z87.1 CAN/

CSA Z94.3 approved safety glasses with side shields.

Operators and others in work area must wear ear protection.

Oil daily for optimal performance.

English

WARNING: RISK OF EXPLOSION OR FIRE

WHAT CAN HAPPEN HOW TO PREVENT IT

• Whenpaintsormaterials

are sprayed, they are broken

into very small particles

and mixed with air. This

will cause certain paints

and materials to become

extremely flammable and

could result in serious

injury or death.

• Neverspraynearopen

flames or pilot lights in

stoves or heaters.

• Neversmokewhilespraying.

• Provideampleventilation

when spraying indoors.

• Thesolvents

1,1,1-Trichloroethane and

Methylene Chloride can

chemically react with the

aluminum used in most

spray equipment, and this

gun and cup, to produce an

explosion hazard and

could result in serious

injury or death.

• Readthelabelordata

sheet for the material

you intend to spray.

• Neveruseanytypeofspray

coating material containing

these solvents.

• Neverusethesesolvents

for equipment cleaning

or flushing.

• Ifindoubtastowhethera

material is compatible,

contact your material supplier.

WARNING:

• Allpersonsintheworkareamustalwayswearapprovedeye

and hearing protection and approved respiratory protection

when this spray gun is in operation.

• Neveraimspraygunatanyone.Donotspraynearsparks,open

flame, lit cigarettes, pilot lights, space heaters or any other

potentialignitionsource,DONOTSMOKEINWORKAREA.

• Onlypersonswellacquaintedwiththeserulesofsafeoperation

should be allowed to use the air tool.

• Followmanufacturersinstructionsandsafetyinformationto

ensuresafehandlingandproperuseofpaints,laquers,thinners,

basecoats,etc.Donotuselatexorotherheavypaints.Theyare

not recommended for this spray gun.

• Alwayskeepworkareafreefromobstructionsand

well ventiilated.

• Alwaysdisconnectspraygunfromairsourcebefore

disassembly.

• Toavoidcreatinganexplosiveatmosphere,workonlyinwell

ventilated areas.

• Alwaysuserespiratoryprotectiontopreventinhalationofharm-

ful fumes and materials.

CAUTION:

• Beforedisassemblyorremovalofanypartofgunorattached

components, shut off compressor, release pressure by

depressing trigger, and disconnect power source.

NEVERassumesystempressureiszero!

WARNING: RISK TO BREATHING (ASPHYXIATION)

WHAT CAN HAPPEN HOW TO PREVENT IT

• Somepaints,coatingsand

solvents may cause lung

damage, and burns if inhaled

or allowed to come into

contact with skin or eyes.

• UseaNIOSHapprovedmask

or respirator and protective

clothing designed for use with

your specific application and

spray materials. Some masks

provide only limited protection

against toxic materials and

harmful paint solvent. Consult

with a Safety Expert or

Industrial Hygienist if

uncertain about your

equipment or materials.

WARNING:

RISK OF INJECTION

WHAT CAN HAPPEN HOW TO PREVENT IT

• Spraygunsoperateat

pressures and velocities high

enough to penetrate human

and animal flesh, which could

result in amputation or other

serious injury.

! See a physician immediately !

• Neverplacehandsin

front of nozzle.

• Directsprayawayfrom

self and others.

• Seekimmediatemedical

attention if direct spray contacts

exposed body parts.

WARNING:

RISK FROM FLYING OBJECTS

WHAT CAN HAPPEN HOW TO PREVENT IT

• Certainpartsareunder

pressure whenever the gun

is connected to a pressurized

air line.These parts may be

propelled if the gun

is disassembled.

• Disconnectthegunfrom

the air line, or completely

depressurize the air line

whenever the gun is to

be disassembled.

•Compressed air may propel

dirt, metal shavings, etc.

and possibly cause an injury.

• Neverpointanynozzleor

sprayer toward a person or part

of the body.

• AlwayswearANSI Z87.1 CAN/

CSA Z94.3 approved safety

glasses with side shields.

• Prolongedexposure

to air spray can result in

permanent damage

to hearing.

• Alwayswearhearingprotection

when operating spray equipment.

English

FEATURES

SPRAY GUN BODY

The body of the spray gun is designed to be well-balanced

and lightweight. The body is a compact size and has a fine

spray for precision jobs.

SPRAY GUN CUP

The cup (A) of the spray gun can hold

133 mL (4.5 oz) and has a removable

snap in lid (K). The design of the spray

gun cup lid (K) includes a lip around the

edge of the lid for easy removal from the

spray gun cup (A).

MATERIAL FILTER

The material filter (B) is used to protect

against contaminants and small par-

ticles.It is located inside of the spray gun,

between the spray gun cup (A) and air

cap (C).

AIR CAP HORNS

The position of the air cap (C) horns (D)

allow two spray patterns.

See Fig. 2.

AIR VOLUME CONTROL KNOB

The air volume control knob (F)

controls the air flow and allows for

a MAX of 30 PSI to reduce over-

spray and efficient air consumption.

AIR INLET

The tool’s air inlet (G) located at

the bottom of the handle is used

for connecting an air supply that

has a standard 1/4” NPT

American thread.

FLUID CONTROL KNOB

The fluid control knob (I) allows

control of the material amount

released (the density of the

“fan spray”).

PATTERN CONTROL KNOB

The pattern control knob (H) allows

the width of the “fan spray”

to be adjusted.

FIXED HOOK

The spray gun includes a fixed hook (J) on the body to allow for

convenient hanging when stored.

INSTALLATION

Air Supply

The recommended hook-up is shown in Figure A. Pneumatic tools

operate on a wide range of air pressures. For maximum efficiency

and longer tool life, the pressure of the air supplied to these

tools MUST not exceed the rated PSI at the tool when the tool is

running. Using a higher than rated pressure will cause faster wear

and drastically shorten the tool’s life. A higher air pressure can also

cause an unsafe condition and explosion.

The inside diameter of the hose

should be increased to compensate for

unusually long air hoses (over 25 feet).

Minimum hose diameter should be 3/8”

I.D. and fittings should

have 1/4” NPT thread.

The use of air line lubricators and air

line filters is recommended to prevent

water in the line that can damage the

tool. Drain the air tank daily. Clean the

air inlet filter screen on at least a weekly

schedule to remove accumulated dirt or

other matter that can restrict air flow.

The tool’s air inlet used for connecting

an air supply has standard 1/4” NPT

American thread.

Safety Rules For Pneumatic Tools

1) Inspect the air hose for cracks or other problems.

Replace the hose if worn.

2) Never point an air hose at another person.

3)Disconnect the tool when not in use, or before performing

service or changing accessories.

4)Use proper hoses and fittings. Never use quick change

couplings attached to the tool. Instead, add a hose and

coupling between the tool and the air supply.

1/2”(or larger)

Pipe and Fittings

Coupler

Air Hose

Leader Hose

Tool

Nipple

Oiler Filter

Drain Daily

Figure A

English

OPERATING PROCEDURES

WARNING:

Donotattempttounclog(backflush)thespraygun

bysqueezingthetriggerwhileholdingyourfingerinfrontof

the fluid nozzle.

CAUTION:

Pressure may vary according to viscosity of material

used.Maximumworkingpressureofthegunis60PSI.Donot

exceedpressurelimitofgunoranyothercomponentinsystem!

CAUTION:

Prior to daily operation, make certain that all

connections and fittings are secure. Check hose and all

connections for a weak or worn condition that could render system

unsafe.Allreplacementcomponentssuchashoseorfittingsmust

haveaworkingpressureequaltoorgreaterthansystempressure.

Prior to shipment, this spray gun was treated with an anticorrosive

agent. Before use, make sure that it is carefully flushed with thinner.

1. Loosen the air cap (C) and rotate the horns (D) to achieve

the desired spray pattern. Tighten the air cap.

2. Attach spray gun cup (A) to the gun handle.

NOTE: The (B) filter supplied is optional to protect against

contaminants and small particles. See parts list for

filter orientation.

CAUTION:

donotuselatexorotherheavypaints

3. Attach air supply line to 1/4" NPS air inlet.

CAUTION:

NEVER point spray gun at self or any other person.

Accidentaldischargeofmaterialmayresultinseriousinjury.

4. Adjust air pressure on the air compressor.

CAUTION:

DONOTexceed60PSI.

5. Depress the spray gun trigger (E) fully to spray material.

NOTE: Depressing the trigger partially will cause only air

to be released.

ADJUST SPRAY GUN:

1. Turn the fluid control knob (I) counterclockwise to increase

the amount of material released, or clockwise to decrease.

2. Turn the pattern control knob (H) counterclockwise to

increase the width of the “fan spray”, or clockwise to decrease

the width of the spray.

3. Turn the air volume control knob (F) counterclockwise

to increase the air quantity, or clockwise to decrease

the air flow.

CAUTION: Care should be exercised when handling spray gun

to avoid damage to the orifice of the air cap and tip of fluid nozzle.

Damagetothesepartsresultsinirregularspraypatterns.

MAINTENANCE

WARNING: Shut off air compressor, release all pressure

by depressing trigger, and disconnect power source before

disassembly or removal of any part of the gun or attached

components.

CAUTION: Alwaysexerciseextremecarewhenusinganysolvent

orthinner.Nevercleanthegunnearfire,flame,oranysourceofheat

or sparks. Properly dispose of used cleaning materials.

CAUTION: DONOTsoaktheentiresprayguninsolventor

thinner for a long period of time as this will destroy lubricants

and possibly impair operation. NEVERuselyeorcausticalkaline

solution for cleaning. Such solutions will attack aluminum alloy

parts of the gun.

MAINTENANCE CONTINUED

It is important that the spray gun be cleaned after each use.

Cleaning

1. Empty material from gravity feed cup and replace with a

suitable solvent or thinner.

2. Operate trigger until all material traces have disappeared

and gun is thoroughly clean.

3. Clean air cap with a brush.

4. Wipe the exterior of the spray gun with a solvent soaked

cloth or use cleaning brush(es) provided to remove any

accumulated material.

IMPORTANT: Make certain that the air cap and fluid nozzle are

kept clean at all times. If necessary, remove these two components

and soak them in solvent. DO NOT use hard objects to clean

clogged holes. The smallest amount of damage may cause

irregular spray pattern.

NOTE: If the fluid nozzle is to be removed for thorough cleaning,

squeeze the trigger to prevent damage of the fluid needle tip when

unscrewing the nozzle.

Lubrication

Lubrication procedures must be observed after thoroughly cleaning the

gun to ensure effective, high quality performance of spray gun.

1. Lubricate working points with straight mineral oil, or castor oil.

2. Periodically, place a few drops of oil on tapered sections

of the fluid nozzle to ensure easy operation of the air cap.

When spraying water base materials, coat the fluid nozzle

inside and outside with straight mineral oil after each use.

3. Outer diameter of the needle sleeve in the ﬂuid needle

assembly must be lubricated occasionally with straight mineral oil.

English

Defective Pattern Likely cause Suggested Remedy

1. Dirty or damaged

air cap

2. Dirty or damaged

fluid tip

1. Rotate air cap 180°. If the

pattern follows the air cap,

the problem is in the air cap.

Clean and inspect the air cap.

If the pattern is not corrected,

replacement is necessary.

2. If pattern doesn’t follow the air cap,

the problem is with the fluid tip.

Clean and inspect the tip for dried

paint, dirt or damage. If the pattern

is not corrected, replacement

is necessary.

Air pressure too high for

material viscosity being

sprayed.

1. Reduce air pressure.

2. Turn pattern control knob

clockwise to decrease fan width.

Turn fluid needle adjusting nut

counterclockwise to increase

fluid flow.

1. Dirty or distorted air

horn holes.

2. One of the air horn

holes completely

obstructed.

1. Rotate air cap 180°. If the

pattern follows the air cap,

the problem is in the air cap.

2. Clean and inspect the horn

holes. If the horn holes are

distorted, replacement is

necessary.

Air getting into paint

stream somewhere.

Example: Same

symptoms as a cup

running out paint.

1. Check and tighten fluid needle

packing nut.

2. Tighten fluid tip.

3. Check fluid tip seat for damage.

4. Check for poor gun to cup seating.

5. Check that cup is correctly

fastened on the gun.

Defective Pattern Likely cause Suggested Remedy

1. Fluid nozzle

cracked or worn

2. Leak at thread

of fluid nozzle

3. Leak at fluid needle

4. Needle packing

worn out

5. Insufficient fluid in cup

6. Vent hole in

container cover clogged

1. Tighten or replace

2. Tighten fluid nozzle

3. Tighten compression nut assembly

or replace needle packing

4. Replace packing

5. Fill cup with fluid

6. Clean out

Air back

pressuring

into cup.

Excessive air blowing

back into cup.

1. Tighten fluid tip.

2. Check fluid tip seat.

3. Check for damaged fluid seat

on tip or seat on gun head.

Unatomized

or spattered

spray

1. Material too heavy

2. Insufficient air

pressure

3. Fluid pressure

too high

4. Dried material on tip

of fluid nozzle or

air jets of air cap

1. Thin material or use larger orifice

fluid nozzle set

2. Increase pressure to within limit

3. Reduce pressure

4. Clean

Inadequate

air delivery 1. Air needle partially

closed

2. Dried material in air

jets or air cap

3. Obstruction in air line

1. Open control knob

2. Clean

3. Remove obstruction

Excessive fog 1. Air pressure too high

for viscosity of fluid 1. Reduce air pressure and/or

open fluid control knob

TROUBLESHOOTING GUIDE

This section provides a list of the more frequently encountered malfunctions, their cause and corrective actions. The operator or maintenance personnel can

perform some corrective actions, and others may require the assistance of a qualified D

WALT technician or your dealer.

Spitting, irregular

or fluttering spray

Heavy top or

bottom pattern

Split

pattern

Gun splitting

Defective Pattern Likely cause Suggested Remedy

Material leaking

from fluid inlet

of cup.

1. Loose cup or

foreign substances

on/ between cup

thread and fluid inlet

1. Tighten and clean

or replace it

Material leaking

from nozzle when

trigger is released

1. Worn fluid needle

2. Dried material in tip

of nozzle

3. Loose packing nut

1. Replace

2. Clean

3. Tighten needle

packing nut by turning

counterclockwise

A. Dried material is

clogging side-port “A”

and causing

side-port “B” to blow

spray towards the

clogged side

Soak side-ports in

thinner to clean clog.

DO NOT poke any

opening with hard objects.

B. 1. Dried material at

fluid nozzle “C”

restricts air flow

2. Loose air nozzle

3. Air pressure

set too high

1. Remove air nozzle.

Wipe off fluid tip using a

cloth soaked in thinner

or by soft brush

2. Fasten nozzle securely

3. Reduce air pressure

TROUBLESHOOTING GUIDE

This section provides a list of the more frequently encountered malfunctions, their cause and corrective actions. The operator or maintenance personnel can