DeWalt D55168 User manual

D55168
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 SERVICIO Y 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-DEWALT • www.dewalt.com

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English
A. On/Off Switch
B. Air Tank Pressure Gauge
C. Regulated Pressure Gauge
D. Pressure Regulator
E. Quick Connect
Pump/Motor Specifications
Voltage: Single Phase 120V
Minimum branch circuit requirement: 15 A
Fuse Type: Time delay
Specifications
MODEL D55168
WEIGHT 88 lbs. (39.92 kg)
HEIGHT 41.75" (1060.5 mm)
WIDTH 19.0" (482.6 mm)
LENGTH 21.25" (539.8 mm)
AIR TANK CAPACITY (GALLONS) 15 Gallon (56.8 liters)
APPROX CUT-IN PRESSURE
160 PSI
APPROX. CUT-OUT PRESSURE
200 PSI
SCFM @ 90 PSI *5.4
NOISE LEVEL +78 dBA
*Tested per ISO 1217:1996
+Tested per ISO 3744:1994
D55168 Air Compressor
F. Check Valve
G. Safety Valve
H. Air Tank Drain Valve
I. Pressure Switch
J. Air Intake Filter
Declared Noise Emission Values
per ISO 3744
Noise Emission Values
Sound Pressure Level: LpA = 78.0 dBA re 20µPA
Uncertainty in the Sound Pressure Level: KpA = 3.0 dBA re 20µPA
Sound Power Level: LwA = 92.0 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
J
D
C
BE
F
I
A
H
G

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Definitions: 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.
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)
Important Safety Instructions
Important Safety Instructions
WARNING: Do not operate this unit until you read and understand
this instruction manual for safety, operation and maintenance
instructions.
WARNING: Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains chemicals known
(to the State of California) to cause cancer, birth defects or other
reproductive harm. Some example of these chemicals are:
• lead from lead-based paints
• crystalline silica from bricks and cement and other masonry
products
• arsenic and chromium from chemically-treated lumber
Your risk from these exposures varies, depending on how often you
do this type of work. To reduce your exposure to these chemicals:
work in a well ventilated area, and work with approved safety
equipment, always wear OSHA/MSHA/NIOSH approved, properly
fitting face mask or respirator when using such tools.
When using air tools, basic safety precautions should always be
followed to reduce the risk of of personal injury.
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 INSTRUCTION
DANGER: RISK OF EXPLOSION OR FIRE
WHAT CAN HAPPEN HOW TO PREVENT IT
• It is normal for electrical con-
tacts 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.

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• If electrical sparks from
compressor come into con-
tact with flammable vapors,
they may ignite, causing fire
or explosion.
• If spraying flammable materi-
als, locate compressor at
least 20 feet (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.
• 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.
• 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 unat-
tended.
• 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
contaminant's 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.

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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 inch 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
manufacturers
recommendation and never
exceed the maximum allowable
pressure rating of attachments.
Never use compressor to
inflate small low pressure
objects such as children’s toys,
footballs, basketballs, etc.
• 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 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.

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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.
• Always turn the compressor off
and bleed pressure from the
air hose and air tank before
attempting maintenance,
attaching tools or accessories.

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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.
WARNING: RISK OF UNSAFE OPERATION
WHAT CAN HAPPEN HOW TO PREVENT IT
• Unsafe operation of your air
compressor could lead to seri-
ous injury or death to you or
others.
• Review and understand all
instructions and warnings in
this manual.
• Become familiar with the
operation and controls of the
air compressor.
• Keep operating area clear of all
persons, pets, and obstacles.
• Keep children 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.

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• Equip area of operation with a
fire extinguisher.
• Do not operate machine with
missing, broken, or unautho-
rized parts.
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.
SAVE THESE INSTRUCTIONS
FOR FUTURE USE
FEATURES
ON/AUTO/OFF SWITCH
Place this switch (A) in the ON/AUTO A
F
I
position to provide automatic power to the
pressure switch and OFF to remove power
at the end of each use.
PRESSURE SWITCH
The pressure switch (I) 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.

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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 (F) 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 (B) indicates D
E
C
B
the reserve air pressure in the tank.
REGULATED PRESSURE GAUGE
The outlet pressure gauge (C) 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 (D) 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 BODY
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.
DRAIN VALVE
The drain valve (H) is located at the base of the air
H
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.
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 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 a 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. To restart:
1. Set the On/Auto/Off lever to OFF and unplug unit.
2. Allow the motor to cool.
3.
Plug the power cord into the correct branch circuit receptacle.
4. Set the On/Auto/Off lever to ON/AUTO position.

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INSTALLATION
Assembly
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.
2. Pull coupler on quick connect body back to release Quick
Connect plug on hose.
Grounding Instructions
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
L
M
K
contains a grounding pin (L). This plug
MUST be used with a grounded
outlet (K).
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 electri-
cian.
• Repairs to the cord set or plug MUST be made by a qualified
electrician.
Extension Cords
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
• 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.

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Voltage and Circuit Protection
Refer to the Voltage and Minimum Branch Circuit Requirements
under Pump/Motor 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 cir-
cuit protected by fuses, use only time delay fuses. Time delay
fuses should be marked “D” in Canada and “T” in the US.
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.
Compatibility
NOTE: Always use an air line filter to remove moisture and oil vapor
when spraying paint.
Location
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 rubber
feet and wheels.
ELECTRICAL
Refer to all safety instructions before using unit. Observe extension
cord safety instructions if necessary. Always move the On/Auto/Off
switch (A) to the OFF position before removing the plug from the
outlet.
TRANSPORTING
When transporting the compressor in a vehicle, trailer, etc., make
sure the tank is drained and the unit is secured with straps to prevent
tipping. Use care when driving to prevent tipping the unit over in the
vehicle. Damage can occur to the compressor or surrounding items
if the compressor is tipped.
LIFTING
Always use two people when lifting and lift
N
N
from the recommended lift points (N). DO
NOT lift by wheels or shroud.
MOVING
CAUTION: The wheels and handle do not
provide adequate clearance, stability, or sup-
port for pulling the unit up and down stairs or
steps. The unit must be lifted or pushed up a
ramp.
1. Grasp handle of compressor and tilt com-
pressor back to rest on wheels.
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.

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2. When location is reached slowly lower compressor to ground.
Always store compressor in a vertical position resting on
the rubber bumpers and wheels.
PREPARATION FOR USE
Pre-Start Checklist (Fig. 1)
1. Ensure the On/Auto/Off switch (A) 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 (H) is closed.
5. Ensure safety valve (G) is functioning properly, see Checking
Safety Valve under Maintenance.
6. Pull the regulator knob (D) 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 minimum
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.
Initial Set-up (Fig. 1)
WARNING: Do not operate this unit until you read and understand
this instruction manual for safety, operation and maintenance
instructions.
BREAK-IN PROCEDURE
WARNING: 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 (A) is in the OFF position.
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.
OPERATING PROCEDURES
Start-up (Fig. 1)
1. Follow Pre-Start Checklist under Preparation for Use.
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.

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CAUTION: Risk of unsafe operation. Compressed air from the
unit may contain water condensation and oil mist. Do not spray unfil-
tered air at an item that could be damaged by moisture. Some air
operated tools or devices may require filtered air. Read the instruc-
tions for the air tool or device.
3. Adjust regulator (D) to desired setting. See Regulator under
Features.
Shut-down (Fig. 1)
1. Move On/Auto/Off switch (A) to the OFF position. NOTE: If
finished using compressor, follow Steps 2 - 6.
NOTE: When the unit has been turned off, it is normal to hear a short
hiss of air being released.
2. Pull the regulator knob (D) 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.
MAINTENANCE
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.
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.
Maintenance Chart
Procedure Daily Weekly Monthly 1 year or
200 Hours
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.

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Checking Safety Valve
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.
Draining Air Tank (Fig. 1)
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. Place a suitable container under the drain valve (H) to catch
discharge.
3. Grasp lever on drain valve.
4. 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.
5. When air tank pressure gauge reads 10 PSI, rotate valve to the
fully open position.
6. Close drain valve when finished.
Checking Air Filter Element (Fig. 1)
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/OFF switch (A) is in the OFF Position.
2. Allow unit to cool.
3. Remove filter cover (J) from base.
4. Remove element from filter base.
J
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
ACCESSORIES
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.
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.

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English
SERVICE INFORMATION
Please have the following information available for all service calls:
Model Number ____________ Serial Number _________________
Date and Place of Purchase ______________________________
Repairs
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.
Full One Year Warranty
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.
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 HOT SURFACES
ADVERTENCIA SUPERFICIESCALIENTES
AVERTISSEMENT SURFACES CHAUDES
DO N OT ADJUSTFACTORY SETTINGS.
TO REDUCE RISK OF ELEC TRIC SHOCK
DO N OT REMOVE COVER.
Pressure cont rols set at facto ry for
maximum sa fe operation.
NO HAGA C AMBIOS ENLOS AJUSTES
DE FÁBRICA. NO RETIRE LA TAPA PARA
REDUCIR EL RIESGO DE CHOQUE ELÉ C TRICO.
Los controles de p resión se ajustan en la
fábrica para máxima segu ridad en la operación.
ADVERTENCIA
WARNING
AVERTISSEMENT

16
English
GLOSSARY
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 Underwriters Laboratories 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.

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English
Troubleshooting Guide
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..........................................................................................................................6
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, 22
Regulator knob has continuous air leak ....................................................................................13
Regulator will not shut off air outlet ...........................................................................................13
Motor will not run .......................................................................................................................6, 14, 15, 16, 17, 18, 19, 20
Squealing Sound .......................................................................................................................21
Troubleshooting Codes
CODE POSSIBLE CAUSE POSSIBLE SOLUTION
1 Pressure switch does not shut off motor when
compressor reaches cut-out pressure Set the On/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 authorized
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.

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English
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 other-
wise 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 authorized
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 compressor
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 over-
load protection trips frequently, contact a D
E WALT factory service
center or a D
E WALT authorized service center.

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English
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 under Installation.
17 Loose electrical connections Check wiring connection inside pressure switch and terminal box
area.
18 Possible defective motor Contact a D
E WALT factory service center or a D E WALT authorized
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 circuit.
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 operate
the compressor on its own branch circuit.
21 Worn Belt Contact a D
E WALT factory service center or a D E WALT authorized
service center.
22 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
Français
Compresseur d’air, modèle D55168
A. Interrupteur Marche/Arrêt
B. Manomètre du réservoir d’air
C. Manomètre régulé
D. Régulateur de pression
E. Branchements rapides
F. Clapet
G. Soupape de sûreté
H. Soupape de purge du
réservoir d’air
I. Rembobineur de cordon
d’alimentation
J. Filtre d’admission d’air
Fiche technique de la pompe/du moteur
Tension : monophasé, 120V
Exigence minimale du circuit de dérivation : 15 A
Type de fusible : temporisation
Fiche technique
MODÈLE D55168
POIDS 39,92 kg (88 livres)
HAUTEUR 1060,5, mm (41,75 po)
LARGEUR 482,6 mm (19,0 po)
LONGUEUR 539,8 mm (21,25 po)
CAPACITÉ DU RÉSERVOIR D’AIR
(GALLONS) 15 (56,8 liters)
PRESSION D’ENCLENCHEMENT
APPROX.
160 PSI
ENV. PRESSION DE DÉCLENCHEMENT
200 PSI
PI3/MIN STANDARD À 90 PSI *5,4
NIVEAU SONORE +78 dBA
* Testé conformément à la norme ISO 1217:1996
+ Testé conformément à la norme ISO 3744:1994
Declared Noise Emission Values
per ISO 3744
Noise Emission Values
Sound Pressure Level: LpA = 78.0 dBA re 20µPA
Uncertainty in the Sound Pressure Level: KpA = 3.0 dBA re 20µPA
Sound Power Level: LwA = 92.0 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
J
D
C
BE
F
I
A
H
G