DeWalt D55171 User manual

D55171
Oil Free Portable Air Compressor
Compresseur d’air portatif sans huile
Compresor de aire sin aceite portátil
INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES
INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIOY PÓLIZA
DE GARANTÍA.ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.
If you have questions or comments, contact us.
Pour toute question ou tout commentaire, nous contacter.
Si tiene dudas o comentarios, contáctenos.
1-800-4-De

2

A. Sliding Handles
B. Drain Valve
C. Storage Support
D. Regulated Pressure Gauge
E. Quick Connects
F. Regulator
G. Safety Valve

Voltage: Single 120V
Minimum branch circuit requirement: 15 A
Fuse Type: Time delay

MODEL D55171
WEIGHT 126 lbs. (57.2 kg)
HEIGHT 18.0" (457.2 mm)
WIDTH 24.0" (609.6 mm)
LENGTH 33.0" (838.2 mm)
AIR TANK CAPACITY (GALLONS) 7.5 Gallon (28.4 liters)
APPROX CUT-IN PRESSURE
145 PSI
APPROX. CUT-OUT PRESSURE
175 PSI
SCFM @ 100 PSI *4.6
NOISE LEVEL +74 dBA
*Tested per ISO 1217
+Tested per ISO 3744

H. Pressure Switch
I. Cord Wrap
J. Air Filter
K. Tank Pressure Gauge
L. On/Auto/Off Switch


Noise Emission Values
Sound Pressure Level: LpA = 74.0 dBA re 20μPA
Uncertainty in the Sound Pressure Level: KpA = 3.0 dBA re 20μPA
Sound Power Level: LwA = 87.0 dBA re 1 pw
Uncertainty in the Sound Power Level: KwA = 3.0 dBA re 1 pw
The sum of the emission value and the uncertainty is the limit
below which there is a 95% confidence the value of a single tool
will lie below when the tool is new.
FIG. 1
E
A
F
L
H
I
D
K
C
B
G
J

3
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
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 situa-
tion which, if not avoided, will result in death or seri-
ous 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.
IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT
THIS OR ANY D
e WALT TOOL, CALL US TOLL FREE AT:
1-800-4-D
e WALT (1-800-433-9258)

WARNING: Do not operate this unit until you read and understand
this instruction manual for safety, operation and maintenance
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.
WARNING: Some dust contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm
such as asbestos and lead in lead based paint.

DANGER: RISK OF EXPLOSION OR FIRE
WHAT CAN HAPPEN HOW TO PREVENT IT
 • Itisnormalforelectrical
contacts within the motor
and pressure switch to
spark.
 • Alwaysoperatethecompres-
sor in a well ventilated area
free of combustible materials,
gasoline, or solvent vapors.
 • Ifelectricalsparksfrom
compressor come into con-
tact with flammable vapors,
they may ignite, causing fire
or explosion.
 • Ifsprayingflammablemate-
rials, locate compressor
at least 20' (6.1 m) away
from spray area. An addi-
tional length of hose may be
required.
 • Storeflammablematerialsin
a secure location away from
compressor.

4

 • Restrictinganyofthecom-
pressor ventilation openings
will cause serious overheat-
ing and could cause fire.
 • Neverplaceobjectsagainst
or on top of compressor
pump.
 • Operatecompressorin
an open area at least 12"
(30.5 cm) away from any
wall or obstruction that would
restrict the flow of fresh air to
the ventilation openings.
 • Operatecompressorina
clean, dry well ventilated area.
Do not operate unit indoors or
in any confined area.
 • Unattendedoperationof
this product could result in
personalinjuryorproperty
damage. To reduce the
risk of fire, do not allow
the compressor to operate
unattended.
 • Alwaysremaininattendance
with the product when it is
operating.
 • Always turn off and unplug
unit when not in use.
DANGER: RISK TO BREATHING (ASPHYXIATION)
WHAT CAN HAPPEN HOW TO PREVENT IT
• Thecompressedairdirectly
from your compressor is not
safe for breathing.The air
stream may contain carbon
monoxide, toxic vapors,
or solid particles from the
air tank.Breathing these
contaminants can cause
seriousinjuryordeath.
• Airobtaineddirectlyfromthe
compressor should never
be used to supply air for
human consumption. In order
to use air produced by this
compressor for breathing,
suitable filters and in-line
safety equipment must be
properly installed. In-line
filters and safety equipment
usedinconjunctionwiththe
compressor must be capable
of treating air to all applicable
local and federal codes prior to
human consumption.
• Sprayedmaterialssuchas
paint, paint solvents, paint
remover, insecticides, weed
killers, may contain harmful
vapors and poisons.
• Workinanareawithgood
cross ventilation.Read and
follow the safety instructions
provided on the label or safety
data sheets for the materials
you are spraying. Always use
certified safety equipment:
OSHA/MSHA/NIOSH
respiratory protection designed
for use with your specific
application.

5
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• Somedustcreatedby
power tools may contain
harmful chemicals.
• Toreduceyourexposure
to these chemicals: work in
a well ventilated area and
always wear OSHA/MSHA/
NIOSH approved, properly
fitting face mask or respirator
when using such tools.
WARNING: RISK OF BURSTING
Air Tank: The air tank on your Air Compressor is designed and
may be UM coded [for units with air tanks greater than 6" (152 mm)
diameter] according to ASME Section VIII, Div. 1 rules. All pressure
vessels should be inspected once every two years. To find your state
pressure vessels inspector, look under the Division of Labor and
Industries in the government section of a phone book or call 1-800-
4-DeWALT for assistance.
The following conditions could lead to a weakening of the air tank,
and result in a violent air tank explosion:
WHAT CAN HAPPEN HOW TO PREVENT IT
• Failuretoproperlydrain
condensed water from
air tank, causing rust and
thinning of the steel air tank.
• Drainairtankdailyorafter
each use. If air tank develops
a leak, replace it immediately
with a new air tank or replace
the entire compressor.
• Modificationsorattempted
repairs to the air tank. • Neverdrillinto,weld,ormake any modifications to the air
tank or its attachments. Never
attempt to repair a damaged or
leaking air tank. Replace with a
new air tank.
• Unauthorizedmodifications
to the safety valve or any
other components which
control air tank pressure.
• Theairtankisdesigned
to withstand specific
operating pressures. Never
makeadjustmentsorparts
substitutions to alter the factory
set operating pressures.
Attachments & accessories:
• Exceedingthepressure
rating of air tools, spray guns,
air operated accessories,
tires, and other inflatables
can cause them to explode
or fly apart, and could result
inseriousinjury.
• Followtheequipmentmanu-
facturers recommendation
and never exceed the maxi-
mum allowable pressure rat-
ing of attachments. Never
use compressor to inflate
smalllowpressureobjects
such as children’s toys, foot-
balls, basketballs, etc.

6
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Tires:
• Over inflation of tires could
resultinseriousinjuryand
property damage.
 • Useatirepressuregaugeto
check the tires pressure before
each use and while inflating
tires; see the tire sidewall for
the correct tire pressure.
NOTE: Air tanks, compressors and
similar equipment used to inflate
tires can fill small tires similar to
theseveryrapidly.Adjustpressure
regulator on air supply to no more
than the rating of the tire pressure.
Add air in small increments and
frequently use the tire gauge to
prevent over inflation.
WARNING: RISK OF ELECTRICAL SHOCK
WHAT CAN HAPPEN HOW TO PREVENT IT
• Your air compressor is
powered by electricity.
Like any other electrically
powered device, If it is not
used properly it may cause
electric shock.
 • Never operate the
compressor outdoors when it
is raining or in wet conditions.
 • Never operate compressor
with protective covers
removed or damaged.
 • Repairs attempted by
unqualified personnel can
resultinseriousinjuryor
death by electrocution.
 • Any electrical wiring or
repairs required on this
product should be performed
by a DeWALT factory
service center or a DeWALT
authorizedservicecenterin
accordance with national and
local electrical codes.
 • Electrical Grounding:
Failure to provide adequate
grounding to this product
couldresultinseriousinjury
or death from electrocution.
See Grounding
Instructions under
Installation.
 • Make certain that the
electrical circuit to which the
compressor is connected
provides proper electrical
grounding, correct voltage
and adequate fuse protection.
WARNING: RISK FROM FLYING OBJECTS
WHAT CAN HAPPEN HOW TO PREVENT IT
• Thecompressedairstream
can cause soft tissue
damage to exposed skin and
can propel dirt, chips, loose
particles,andsmallobjects
at high speed, resulting in
property damage or personal
injury.
• Always wear certified safety
equipment: ANSI Z87.1 eye
protection (CAN/CSA Z94.3)
with side shields when using
the compressor.
• Neverpointanynozzleor
sprayer toward any part of
the body or at other people or
animals.

7

• Alwaysturnthecompressoroff
and bleed pressure from the
air hose and air tank before
attempting maintenance,
attaching tools or accessories.
WARNING: RISK OF HOT SURFACES
WHAT CAN HAPPEN HOW TO PREVENT IT
• Touchingexposedmetal
such as the compressor
head, engine head, engine
exhaust or outlet tubes, can
result in serious burns.
 • Nevertouchanyexposed
metal parts on compressor
during or immediately after
operation. Compressor will
remain hot for several minutes
after operation.
 • Donotreacharound
protective shrouds or attempt
maintenance until unit has
been allowed to cool.
WARNING: RISK FROM MOVING PARTS
WHAT CAN HAPPEN HOW TO PREVENT IT
• Movingpartssuchasthe
pulley, flywheel, and belt can
causeseriousinjuryifthey
come into contact with you or
your clothing.
• Neveroperatethecompressor
with guards or covers which
are damaged or removed.
• Keepyourhair,clothing,and
gloves away from moving
parts.Looseclothes,jewelry,
or long hair can be caught in
moving parts.
• Airventsmaycovermoving
parts and should be avoided
as well.
• Attemptingtooperate
compressor with damaged or
missing parts or attempting
to repair compressor with
protective shrouds removed
can expose you to moving
parts and can result in
seriousinjury.
• Anyrepairsrequiredonthis
product should be performed
by a DeWALT factory
service center or a DeWALT
authorizedservicecenter.

8

WARNING: RISK OF FALLING
WHAT CAN HAPPEN HOW TO PREVENT IT
• Aportablecompressor
can fall from a table,
workbench, or roof causing
damage to the compressor
and could result in serious
injuryordeathtothe
operator.
• Alwaysoperatecompressor
in a stable secure position to
prevent accidental movement
of the unit. Never operate
compressor on a roof or
other elevated position. Use
additional air hose to reach
high locations.
WARNING: RISK OF INJURY FROM LIFTING
WHAT CAN HAPPEN HOW TO PREVENT IT
 • Seriousinjurycanresult
from attempting to lift too
heavyanobject.
•The compressor is too heavy
to be lifted by one person.
Obtain assistance from
others before lifting.
CAUTION: RISK FROM NOISE
WHAT CAN HAPPEN HOW TO PREVENT IT
 • Under some conditions and
duration of use, noise from
this product may contribute
to hearing loss.
 • Alwayswearcertifiedsafety
equipment: ANSI S12.6
(S3.19) hearing protection.
WARNING: RISK OF UNSAFE OPERATION
WHAT CAN HAPPEN HOW TO PREVENT IT
• Unsafeoperationofyourair
compressor could lead to seri-
ousinjuryordeathtoyouor
others.
• Reviewandunderstandall
instructions and warnings in
this manual.
• Becomefamiliarwiththe
operation and controls of the
air compressor.
• Keepoperatingareaclear
of all persons, pets, and
obstacles.
• Keepchildrenawayfromthe
air compressor at all times.
• Donotoperatetheproduct
when fatigued or under the
influence of alcohol or drugs.
Stay alert at all times.
• Neverdefeatthesafetyfea
tures of this product.
• Equipareaofoperationwith
a fire extinguisher.
• Donotoperatemachinewith
missing, broken, or unautho-
rizedparts.
• Neverstandonthe
compressor.

9



)
ON/AUTO/OFF SWITCH
Place this switch (L) in the ON/AUTO H
L
position to provide automatic power to the
pressure switch and OFF to remove power
at the end of each use. NOTE: ALWAYS
ensure the switch (L) is in the OFF
position before removing or replacing
pressure switch cover.
PRESSURE SWITCH
The pressure switch (H) automatically starts the motor when the
air tank pressure drops below the factory set cut-in pressure. It
stops the motor when the air tank pressure reaches the factory set
cut-out pressure.
SAFETY VALVE
If the pressure switch does not shut off the air
G
compressor at its cut-out pressure setting, the
safety valve (G) will protect against high pressure
by popping out at its factory set pressure (slightly
higher than the pressure switch cut-out setting).
CHECK VALVE
When the air compressor is operating, the check valve is open,
allowing compressed air to enter the air tank. When the air
compressor reaches cut-out pressure, the check valve closes,
allowing air pressure to remain inside the air tank.
TANK PRESSURE GAUGE
The tank pressure gauge (K) indi- E
FD
K
cates the reserve air pressure in
the tank.
REGULATED PRESSURE
GAUGE
The regulated pressure gauge (D)
indicates the air pressure available
at the outlet side of the regulator. This pressure is controlled by the
regulator and is always less than or equal to the tank pressure.
REGULATOR
The regulator (F) controls the air pressure shown on the regulated
pressure gauge. Pull the knob out and turn clockwise to increase
pressure and counterclockwise to decrease pressure. When the
desired pressure is reached push knob in to lock in place.
UNIVERSAL QUICK CONNECT BODIES
The universal quick connect body (E) accepts the three most popular
styles of quick connect plugs: Industrial, automotive, and ARO. One
hand push-to-connect operation makes connections simple and
easy. The two quick connect bodies allow the use of two tools at the
same time.
DRAIN VALVE
The drain valve (B) is located at the base of
B
the air tank and is used to drain
condensation at the end of each use.
See
Draining Air Tank under Maintenance.
COOLING SYSTEM
This compressor contains an advanced design cooling system.
It is normal for this fan to blow air through the vent holes in large
amounts. The cooling system is working when air is expelled.

10

AIR COMPRESSOR PUMP
The pump compresses air into the air tank. Working air is not
available until the compressor has raised the air tank pressure
above that required at the air outlet.
AIR INTAKE FILTER
The filter (J) is designed to clean air entering the
J
pump. To ensure the pump continually receives a
clean, cool, and dry air supply the filter must always
be clean and the filter intake must be free from
obstructions.
MOTOR OVERLOAD PROTECTOR
The motor has an automatic reset thermal overload protector. If the
motor overheats for any reason, the overload protector will shut off
the motor.The motor must be allowed to cool down before restarting.
The compressor will automatically restart after the motor cools.


INSTALLING HOSES
WARNING: Risk of unsafe operation. Firmly grasp hose in hand
when installing or disconnecting to prevent hose whip.
1. Ensure regulated pressure gauge reads 0 PSI.
2. Grasp the hose at the quick connect plug and push the plug
into the quick connect body (E). Coupler will snap into place.
3. Grasp the hose and pull to ensure coupler is seated.
DISCONNECTING HOSES
WARNING: Risk of unsafe operation. Firmly grasp hose in hand
when installing or disconnecting to prevent hose whip.
1. Ensure regulated pressure gauge reads 0 PSI (0 kPa).
2. Push coupler on quick connect body back to release quick
connect plug on hose.

WARNING: Risk of electrical shock. In the event of a short
circuit, grounding reduces the risk of shock by providing an escape
wire for the electric current. This air compressor must be properly
grounded.
The portable air compressor is equipped with a cord having a
grounding wire with an appropriate grounding plug.
1. The cord set and plug (M) with this unit
N
M
O
contains a grounding pin (N).This plug
MUST be used with a grounded
outlet (O).
IMPORTANT: The outlet being used must
be installed and grounded in accordance
with all local codes and ordinances.
2. Ensure the outlet being used has the same configuration as the
grounded plug. DO NOT USE AN ADAPTER.
3. Inspect the plug and cord before each use. Do not use if there
are signs of damage.
4. If these grounding instructions are not completely understood, or
if in doubt as to whether the compressor is properly grounded,
have the installation checked by a qualified electrician.
DANGER: Risk of electrical shock. IMPROPER GROUNDING
CAN RESULT IN ELECTRICAL SHOCK.
•Do not modify the plug provided. If it does not fit the available
outlet, a correct outlet should be installed by a qualified
electrician.
•Repairs to the cord set or plug MUST be made by a qualified
electrician.

11


If an extension cord must be used, be sure it is:
 • a3wireextensioncordthathasa3bladegroundingplug,and
a 3-slot receptacle that will accept the plug on the product
 • ingoodcondition
 • plugisnotworn
 • nolongerthan50feet(15.2m)
 • 12gauge(AWG)orlarger.(Wiresizeincreasesasgaugenum-
ber decreases. 10 AWG and 8 AWG may also be used. DO NOT
USE 14 OR 16 AWG.)
CAUTION: The use of an undersized extension cord will cause volt-
age to drop resulting in power loss to the motor and overheating.
Instead of using an extension cord, increase the working reach of
the air hose by attaching another length of hose to its end. Attach
additional lengths of hose as needed. Always use a minimum 3/8"
(9.5 mm) or greater air hose rated at 300 PSI.

Refer to the Voltage and Minimum Branch Circuit Requirements
under Specifications.
CAUTION: Certain air compressors can be operated on a
15 amp circuit if the following conditions are met.
• Voltage supply to circuit must comply with the National
Electrical Code.
• Circuitisnotusedtosupplyanyotherelectricalneeds.
• Extensioncordscomplywithspecifications.
• Circuitisequippedwitha15ampcircuitbreakeror15amp
time delay fuse. NOTE: If compressor is connected to a circuit
protected by fuses, use only time delay fuses. Time delay
fuses should be marked “D” in Canada and “T” in the U.S.
If any of the above conditions cannot be met, or if operation of the
compressor repeatedly causes interruption of the power, it may be
necessary to operate it from a 20 amp circuit. It is not necessary to
change the cord set.

NOTE: Always use an air line filter to remove moisture and oil vapor
when spraying paint.

Place the air compressor in a clean, dry and well ventilated area
at least 12" (30.5 cm) away from the wall or other obstructions that
will interfere with the flow of air. Keep the compressor away from
areas that have dirt and/or volatile fumes in the atmosphere. These
impurities may clog the intake filter and valves, causing inefficient
operation.
WARNING: The air compressor pump and shroud are designed
to allow for proper cooling. The ventilation openings on the com-
pressor are necessary to maintain proper operating temperature.
Do not place rags or other containers on or near these openings.
Place the air compressor on a flat surface resting on the wheels
and rubber foot.
ELECTRICAL
Refer to all safety instructions before using unit. Observe extension
cord safety instructions, if necessary. Always move the On/Auto/Off
switch (L) to the OFF position before removing the plug from the
outlet.

12


When transporting the compressor in a vehicle,
A
C
trailer, etc. ensure that the air tank is drained and
theunitissecuredandplacedonaflathorizontal
surface. Use care when driving so to avoid
tipping the unit over in the vehicle. Damage can
occur to the unit or surrounding items if unit is
tipped. Storecompressorinaverticalorhorzitionalposition.
LIFTING
Always use two people when lifting and lift from the recommended
lift points A and C.
MOVING
1. Support compressor and pull handle (A) until fully extended (lock
position).
AA
WARNING: Risk of unsafe operation. Ensure proper footing and
use caution when rolling compressor so that unit does not tip or
cause loss of balance.
2. To move, roll compressor on tires using handle (A) as shown.


1. Ensure the On/Auto/Off switch (L) is in the OFF position.
2. Plug the power cord into the correct branch circuit receptacle. See
Voltage and Circuit Protection under Installation.
3. Ensure air tank is drained, see Draining Air Tank under
Maintenance.
4. Ensure the drain valve (
B ) is closed.
5. Ensure safety valve (
G ) is functioning properly, see Checking
Safety Valve under Maintenance.
6. Pull the regulator knob (F) out and turn counterclockwise until fully
closed. Ensure regulated pressure gauge reads 0 PSI. Push knob
in to lock in place.
7. Attach hose and accessories. NOTE: Always use a mini-
mum 3/8" (9.5 mm) or greater air hose rated at 300 PSI.
WARNING: Risk of unsafe operation. Firmly grasp air hose in hand
when installing or disconnecting to prevent hose whip.
WARNING: Risk of unsafe operation. Do not use damaged or worn
accessories.
WARNING: Risk of Bursting. Too much air pressure causes a
hazardous risk of bursting. Check the manufacturer’s maximum
pressure rating for air tools and accessories. The regulator outlet
pressure must never exceed the maximum pressure rating.
 
WARNING: Do not operate this unit until you read and understand
this instruction manual for safety, operation and maintenance
instructions.
BREAK-IN PROCEDURE
CAUTION: Risk of unsafe operation. Do not operate in vertical
position.Verticalpositionisforstorageonly.
CAUTION: Risk of property damage. Serious damage may result if
the following break-in instructions are not closely followed.
This procedure is required before the air compressor is put into
service for the first time and when the check valve or a compressor
pump/motor has been replaced.
1. Ensure the On/Auto/Off switch (L) is in the OFF position.

13

NOTE: If hose is not connected to Quick Connect body, pull coupler
back until it clicks to prevent air from escaping through the quick
connect.
2.
Plug the power cord into the correct branch circuit receptacle. See
Voltage and Circuit Protection under Installation.
3. Open the drain valve (turn lever counter-clockwise) fully to
permit air to escape and prevent air pressure build up in the air
tank during the break-in period.
4. Move the On/Auto/Off switch to the ON position. The compressor
will start.
5. Run the compressor for 15 minutes.
6. After 15 minutes, close the drain valve by turning lever
clockwise. The tank will fill to cut-out pressure and the motor
will stop.
7. Compressed air will be available until it is used or bled off.


1. Follow Pre-Start Checklist under Preparation for Use.
CAUTION: Risk of unsafe operation. Do not operate in vertical
position.Verticalpositionisforstorageonly.
2. Move the On/Auto/Off switch to the ON position and allow tank
pressure to build. Motor will stop when tank pressure reaches
cut-out pressure.
CAUTION: Risk of unsafe operation. Compressed air from the
unit may contain water condensation and oil mist. Do not spray
unfiltered air at an item that could be damaged by moisture. Some
air operated tools or devices may require filtered air. Read the
instructions for the air tool or device.
 3.Adjust regulator (F) to desired setting. See Regulator under
Features.

1. Move On/Auto/Off switch (L) to the OFF position. NOTE: If
finished using compressor, follow Steps 2 - 6.
2. Pull the regulator knob (F) out and turn counterclockwise until fully
closed.Ensure regulated pressure gauge reads 0 PSI. Push knob
in to lock in place.
3. Remove hose and accessory.
WARNING: Risk of unsafe operation. Firmly grasp air hose in hand
when installing or disconnecting to prevent hose whip.
4. Drain the air tank,
see Draining Air Tank under Maintenance .
Ensure air tank pressure gauge reads 0 PSI.
WARNING: Risk of bursting. Drain air tank daily. Water will
condense in air tank. If not drained, water will corrode and weaken
the air tank causing a risk of air tank rupture.
5. Allow the compressor to cool down.
 6.Wipe air compressor clean and store in a safe, nonfreezing
area.

The following procedures must be followed when maintenance or
service is performed on the air compressor.
1. Ensure On/Auto/Off switch is in the OFF position.
2. Remove air compressor plug from outlet.
3. Drain air tank.
4. Allow air compressor to cool down before starting service.
NOTE: All compressed air systems contain maintenance parts (e.g.,
oil, filters, separators) that are periodically replaced.These used parts
may contain substances that are regulated and must be disposed of in
accordance with local, state, and federal laws and regulations.
NOTE: Take note of the positions and locations of parts during
disassembly to make reassembly easier.

14

NOTE: Any service operations not included in this section should
be performed by a D
e WALT factory service center or a D e WALT
authorizedservicecenter.

Procedure Daily Weekly
Check safety valve X
Inspect air filter X
Drain air tank X
Check for unusual noise/
vibration
X
Check for air leaks* X
Clean compressor exterior X
*Tocheckforairleaksapplyasolutionofsoapywateraroundjoints.
While compressor is pumping to pressure and after pressure cuts
out, look for air bubbles to form.

WARNING: Risk of bursting. If the safety valve does not work
properly, over-pressurization may occur, causing air tank rupture or
an explosion.
WARNING: Risk from flying objects. Always wear certified safety
equipment: ANSI Z87.1 eye protection (CAN/CSA Z94.3) with side
shields when using the compressor.
Before starting compressor, pull the ring on the safety valve to
make sure that the safety valve operates freely. NOTE: Ring may
be difficult to pull when air tank pressure is at 0 PSI. If the valve is
stuck or does not operate smoothly, it must be replaced with the
same type of valve.

WARNING: Risk of unsafe operation. Risk from noise. Air tanks
contain high pressure air. Keep face and other body parts away from
outlet of drain. Use eye protection [ANSI Z87.1 (CAN/CSA Z94.3)]
when draining as debris can be kicked up into face.
WARNING: Risk from noise. Use ear protection [ANSI S12.6
(S3.19)] as air flow noise is loud when draining.
NOTE: All compressed air systems generate condensate that
accumulates in any drain point (e.g. tanks, filter, aftercoolers, dryers).
This condensate contains lubricating oil and/or substances which
may be regulated and must be disposed of in accordance with local,
state, and federal laws and regulations.
1. Ensure On/Auto/Off switch is in the OFF position.
2. Lift compressor into an inclined position so drain valve (B) is at
the lowest point (this will assist in removing moisture, dirt, etc.
from air tanks).
3. Place a suitable container under the drain valve to catch
discharge.
4. Grasp lever on drain valve.
5. Slowly rotate lever to gradually bleed air from air tank.
WARNING: Risk of bursting. Drain air tank daily. Water will con-
dense in air tank. If not drained, water will corrode and weaken the
air tank causing a risk of air tank rupture.
CAUTION: Risk of property damage. Drain water from air tank may
contain oil and rust, which can cause stains.
6. When air tank pressure gauge reads 10 PSI, rotate valve to the
fully open position.
7. Close drain valve when finished.

15


WARNING: Hot surfaces. Risk of burn. Outlet tube, pump head,
and surrounding parts are very hot, do not touch. Allow compressor
to cool prior to servicing.
1. Ensure On/Auto/Off switch (L) is in the OFF Position.
2. Allow unit to cool.
3. Remove filter cover (J) from filter base.
J
4. Remove element from filter base.
5. Place new element back in filter base. Purchase
replacement parts from your local dealer or
authorized service center. Always use identical replacement
parts.
6. Snap filter cover to filter base.
CAUTION: Risk of unsafe operation. Do not operate without air
inlet filter

WARNING: The use of any other accessory not recommended for
use with this tool could be hazardous. Use only accessories rated
equal to or higher than the rating of the air compressor.
Recommended accessories for use with your tool are available
for purchase from your local dealer or authorized service center.
If you need assistance in locating any accessory for your tool,
please contact D
e WALT Industrial Tool Co., 701 East Joppa Road,
Baltimore, MD 21286, call 1-800-4-D
e WALT (1-800-433-9258) or visit
our website www.dewalt.com.

Please have the following information available for all service calls:
Model Number ____________ Serial Number _________________
Date and Place of Purchase ______________________________

To assure product SAFETY and RELIABILITY, repairs, maintenance
andadjustmentshouldbeperformedbyaD
e WALT factory service
center, a D
e WALT authorized service center or other qualified
service personnel. Always use identical replacement parts.

DeWALT heavy duty industrial tools are warranted for one year from
date of purchase. We will repair, without charge, any defects due
to faulty materials or workmanship. For warranty repair information,
call 1-800-4-D
e WALT. This warranty does not apply to accessories
or damage caused where repairs have been made or attempted by
others. This warranty gives you specific legal rights and you may
have other rights which vary in certain states or provinces.
LATIN AMERICA: This warranty does not apply to products sold
in Latin America. For products sold in Latin America, see country
specific warranty information contained either in the packaging, call
the local company or see website for warranty information.

16

FREE WARNING LABEL REPLACEMENT: If your warning labels
become illegible or are missing, call 1-800-4-D
e WALT for a free
replacement.
WARNING
DRAIN TANK DAILY OR AFTER EVERY 4 HOURS OF USE. CONDENSATION BUILD-UP MAY CAUSE
CO RROSION INSIDE TANK RESULTING IN TANK FAILURE. SEE MANUAL FOR INSPECTION PROCEDURES.
TO DRAIN TANK OPEN V A LVE SLOWLY ANDTIL T COMPRESSOR TO EMPTYACCUMULATED WA TER.
ADVERTENCIA
DRENE EL TANQUE A DIARIO O DESPUÉS DE CADA 4 HORAS DE USO. LA ACUMULACIÓN DE
CONDENSACIÓN PUEDE OCASIONAR CORROSIÓN DENTRO DEL TANQUE Y PROVOCAR F A LLA DEL
TANQUE. CONSULTE EL MANUAL P A RA CONOCER LOS PROCEDIMIENTOS DE INSPECCIÓN. P A RA DRENAR EL TANQUE, ABRA LA
V Á LVULA LENT A MENTE E INCLINE EL COMPRESOR P A RAELIMINAR EL AG U A ACUMULADA.
AVERTISSEMENT
RÉSERVOIR DE VIDANGE QUOTIDIEN OU APRÈS TOUTES LES 4 HEURES D'UTILISATION.
L'HABILLAGE DE CONDENSATION PEUT CAUSER LA CORROSION À L'INTÉRIEUR DU RÉSERVOIR A Y ANT
POUR RÉSUL T A T L'ÉCHEC DE RÉSERVOIR. VOIR LE MANUEL POUR DES PROCÉDURES D'INSPECTION. À LA VA L V E
OUVERTE DE RÉSERVOIR DE VIDANGE LENTEMENT ETA U CO MPRESSEUR D'INCLINAISON À L ' EAU ACCUMULÉE VIDE.
W A RNING HOT SURFACES
ADVERTENCIA SUPERFICIES CALIENTES
A V ERTISSEMENT SURFACES CHAUDES
DO N OT O PE RATE IN UP RI GHT
PO SI TIO N. U PRIGH T POSIT IO N
IS F OR S TORAGE ON LY .
no o pe re la h er ramie n taen
po si ció n v e rtical. Só lo
al m a cene e n es tapo si ció n.
ne pas fai re fo ncti on ner e n po sitio n
ve rtical e. L a pos it ion ve rtical e e st
ré s e rvée austo c kag e uni qu eme n t.
DO NOT ADJUST F A CTORY SETTINGS.
TO REDUCE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER.
Pres sure controls set at factory for
maximum safe operation.
NO HAG A CAMB IOS EN LO S AJUS TES
DE FÁBR ICA. N O RETI RE LA T A P A P A R A
RED UCIR EL R IESG O DE CHO QUE EL ÉCTR ICO .
Los con trol es de pr esión s e ajus tan en l a
fáb rica pa ra máx ima se guri dad en l a opera ción .
ADVERTENCIA
WARNING
AVERTISSEMENT
NE PAS MO DIFI ER LES R ÉGLAG ES DE L'US INE. N E PAS
RET IRER L E COUVE RCLE A FIN DE R ÉDUIR E LES RI SQUE S
DE CH OCS ÉLE CTR IQUES .
La pr essio n est ré glée e n usin e an de m aximi ser la
séc urité d e fonc tion neme nt.

CFM: Cubic feet per minute.
SCFM: Standard cubic feet per minute; a unit of measure of air
delivery.
PSI: Pounds per square inch; a unit of measure of pressure.
kPa (kilopascal): Metric pressure measurement. 1 kilopascal
equal 1000 pascals.
Code Certification: Products that bear one or more of the
following marks: UL, CUL, ETL, CETL, have been evaluated by
OSHA certified independent safety laboratories and meet the
applicable Standards for Safety.
Cut-In Pressure: While the motor is off, air tank pressure drops
when accessory is used.When the tank pressure drops to a certain
low level the motor will restart automatically. The low pressure at
which the motor automatically restarts is called cut-in pressure.
Cut-Out Pressure: When an air compressor is turned on and
begins to run, air pressure in the air tank begins to build. It builds
to a certain high pressure before the motor automatically shuts
off, protecting your air tank from pressure higher than its capacity.
The high pressure at which the motor shuts off is called cut-out
pressure.
Branch Circuit: The circuit carrying electricity from electrical panel
to outlet.
Duty Cycle: This air compressor pump is capable of running
continuously. However, to prolong the life of your air compressor,
it is recommended that a 50%-75% average duty cycle be
maintained; that is, the air compressor pump should not run more
than 30-45 minutes in any given hour.

17


This section provides a list of the more frequently encountered malfunctions, their causes and corrective actions.The operator or maintenance
personnel can perform some corrective actions, and others may require the assistance of a qualified DeWALT technician or your dealer.
Problem Code
Excessive air tank pressure-safety valve pops off ......................................................................1, 2
Air leaks ....................................................................................................................................3
Air leaks in air tank or at air tank welds ....................................................................................4
Air leaks between head and valve plate....................................................................................5
Air leaks from safety valve.........................................................................................................6
Knocking Noise..........................................................................................................................11
Pressure reading on the regulated pressure gauge drops when an accessory is used...........7
Compressor is not supplying enough air to operate accessories..............................................8, 9, 10, 11, 12, 21
Regulator knob has continuous air leak ....................................................................................13
Regulator will not shut off air outlet ...........................................................................................13
Motor will not run .......................................................................................................................11, 14, 15, 16, 17, 18, 19, 20

CODE POSSIBLE CAUSE POSSIBLE SOLUTION
1 Pressure switch does not shut off motor when com-
pressor reaches cut-out pressure Set the On/Auto/Off switch to OFF, if the unit does not shut off contact a D e WALT factory service center or a D e WALTauthorized
service center.
2 Pressure switch cut-out too high Contact a D
e WALT factory service center or a D e WALT autho-
rizedservicecenter.
3 Tube fittings are not tight enough Tighten fittings where air can be heard escaping. Check fittings
with soapy water solution. Do Not Overtighten.

18

CODE POSSIBLE CAUSE POSSIBLE SOLUTION
4 Defective air tank Air tank must be replaced. Do not repair the leak.
WARNING: Risk of bursting. Do not drill into, weld or otherwise
modify air tank or it will weaken. The air tank can rupture or
explode.
5 Leaking seals Contact a D
e WALT factory service center or a D e WALT autho-
rizedservicecenter.
6 Defective safety valve Operate safety valve manually by pulling on ring. If valve still
leaks, it must be replaced.
7Regulatorisnotadjustedcorrectlyforaccessory
being used It is normal for some pressure drop to occur when an accessory isused,adjusttheregulatorasinstructedinRegulator under
Features if pressure drop is excessive.
NOTE:Adjusttheregulatedpressureunderflowconditions
while accessory is being used.
8 Prolonged excessive use of air Decrease amount of air usage.
9 Compressor is not large enough for accessory Check the accessory air requirement. If it is higher than the
CFM or pressure supplied by your air compressor, a larger com-
pressor is needed to operate accessory.
10 Hole in air hose Replace air hose.
11 Check valve restricted Remove, clean or replace.
12 Air leaks Tighten fittings.
13 Regulator is damaged Replace.
14 Motor overload protection switch has tripped Refer to Motor Overload Protection under Features. If motor
overload protection trips frequently, contact a D
e WALT factory
service center or a D
e WALTauthorizedservicecenter.

19

CODE POSSIBLE CAUSE POSSIBLE SOLUTION
15 Tank pressure exceeds pressure switch cut-in
pressure Motor will start automatically when tank pressure drops below cut-in pressure of pressure switch.
16 Extension cord is wrong length or gauge Check for proper gauge wire and cord length. Refer to the
Extension Cords paragraph in the Installation section.
17 Loose electrical connections Contact a D
e WALT factory service center or a D e WALT autho-
rizedservicecenter.
18 Possible defective motor Contact a D
e WALT factory service center or a D e WALT autho-
rizedservicecenter.
19 Paint spray on internal motor parts Contact a D e WALT factory service center or a D e WALTauthorized
service center. Do not operate the compressor in the paint spray
area. See flammable vapor warning.
20 Fuse blown, circuit breaker tripped 1. Check fuse box for blown fuse and replace as necessary.
Reset circuit breaker. Do not use a fuse or circuit breaker with
higher rating than that specified for our particular branch cir-
cuit.
2. Check for proper fuse. You should use a time delay fuse.
3. Check for low voltage conditions and/or proper extension
cord.
4. Disconnect the other electrical appliances from circuit or oper-
ate the compressor on its own branch circuit.
21 Restricted air intake filter Clean or replace air intake filter. Do not operate the air
compressor with the filter removed. Refer to the Air Filter
paragraph in the Maintenance section.


20

Tension : monophasé, 120V
Exigence minimale du circuit de dérivation : 15 A
Type de fusible : temporisation

MODÈLE D55171
POIDS 57,2 kg (126 lbs.)
HAUTEUR 457,2 mm (18,0 po)
LARGEUR 609,6 mm (24,0 po)
LONGUEUR 838,2 mm (33,0 po)
CAPACITÉ DU RÉSERVOIR D’AIR
(GALLONS) 7,5 (28,4 liters)
PRESSION D’ENCLENCHEMENT
APPROX.
145 PSI
ENV. PRESSION DE DÉCLENCHEMENT
175 PSI
PI3/MIN STANDARD À 90 PSI *4,6
NIVEAU SONORE +74,0 dBA
* Testé conformément à la norme ISO 1217
+ Testé conformément à la norme ISO 3744
A. Poignées coulissantes
B. Robinet de purge
C. Appui de rangement
D. Régulateur de pression
E. Branchements rapides
F. Régulateur
G. Soupape de sûreté
H. Manocontacteur
I. Rembobineur de cordon
d’alimentation
J. Filtre d’admission d’air
K. ManomÈtre de réservoir
L. Interrupteur marche arrêt


Valeur de l’émission de bruits
Niveau de pression acoustique : LpA = 74,0 dBA re 20μPA
Incertitude du niveau de
pression acoustique calculé : KpA = 3,0 dBA re 20μPA
Niveau de puissance acoustique : LwA = 87,0 dBA re 1 pw
Incertitude du niveau de puissance
acoustique : KwA = 3,0 dBA re 1 pw
La somme de la valeur de l’émission et de l’incertitude établit la
limite sous laquelle la valeur pour un seul outil y sera inférieure et
ce, à 95 % de fiabilité statistique.
 FIG. 1
E
A
F
L
H
I
D
K
C
B
G
J