Porter-Cable C7550 User manual

Oil Lube Two Stage
Air Compressor
Instruction
manual
IMPORTANT
Please make certain that the person
who is to use this equipment carefully
reads and understands these
instructions before starting operations.
Part No. D27042-045-0
ESPAÑOL: PÁGINA 27
FRANÇAIS: PAGE 53
To learn more about Porter-Cable
visit our website at:
http://www.porter-cable.com
Copyright © 2004 Porter-Cable Corporation
The Model and Serial No. plate is located on the frame.
Record these numbers in the spaces below and retain for
future reference.
Model No.
Type
Serial No.
MODEL
C7550

2-ENGD27042
SAFETY GUIDELINES - DEFINITIONS
Indicates an imminently
hazardous situation
which, if not avoided, will result in death
or serious injury.
Indicates a potentially
hazardous situation
which, if not avoided, could result in
death or serious injury.
Indicates a potentially
hazardous situation
which, if not avoided, may result in
minor or moderate injury.
Used without the
safety alert symbol
indicates a potentially hazardous
situation which, if not avoided, may
result in property damage.
This manual contains information that is important for you to know and
understand. This information relates to protecting YOUR SAFETY and
PREVENTING EQUIPMENT PROBLEMS. To help you recognize this
information, we use the symbols below. Please read the manual and pay
attention to these symbols.
IMPORTANT SAFETY INSTRUCTIONS
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
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.

3-ENG D27042
IMPORTANT SAFETY INSTRUCTIONS
Save these instructions
Improper operation or maintenance of this product could result in serious injury and
property damage. Read and understand all warnings and operation instructions before
using this equipment.
HAZARD
WARNING: Risk of explosion or fire
How To Prevent It
What Could Happen
It is normal for electrical contacts
within the motor and pressure switch to
spark.
If electrical sparks from compressor
come into contact with flammable
vapors, they may ignite, causing fire or
explosion.
Restricting any of the compressor
ventilation openings will cause serious
overheating and could cause fire.
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 operate the compressor in a well
ventilated area free of combustible
materials, gasoline, or solvent vapors.
If spraying flammable materials, locate
compressor at least 20 feet away from
spray area. An additional length of hose
may be required.
Store flammable materials in a secure
location away from compressor.
Never place objects against or on top
of compressor. Operate compressor in
an open area at least 12 inches 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.
Always remain in attendance with the
product when it is operating.
Always disconnect electrical power by
moving pressure switch lever to the off
position and drain tank daily or after
each use.

4-ENGD27042
WARNING: Risk of Bursting
Air Tank: The following conditions could lead to a weakening of the tank, and result
in a violent tank explosion and could cause property damage or serious injury.
How To Prevent It
What Could Happen
WARNING: Risk from Flying Objects
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 ANSI Z87.1 approved safety
glasses 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 tank
before attempting maintenance, attaching
tools or accessories.
HAZARD
HAZARD
Drain tank daily or after each use. If
tank develops a leak, replace it
immediately with a new tank or replace
the entire compressor.
Failure to properly drain condensed
water from tank, causing rust and
thinning of the steel tank.
Modifications or attempted repairs to
the tank.
Unauthorized modifications to the
unloader valve, safety valve, or any
other components which control tank
pressure.
Never drill into, weld, or make any
modifications to the tank or its
attachments.
Excessive vibration can weaken the
air tank and cause rupture or
explosion
The tank is designed to withstand specific
operating pressures. Never make
adjustments or parts substitutions to
alter the factory set operating
pressures.
For essential control of air pressure, you
must install a pressure regulator and
pressure gauge to the air outlet (if not
equipped) of your compressor. 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.
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.
How To Prevent It
What Could Happen

5-ENG D27042
WARNING: Risk to Breathing
WARNING: Risk of Electrical Shock
HAZARD
HAZARD
Your air compressor is powered by
electricity. Like any other electrically
powered device, If it is not used
properly it may cause electric shock.
Repairs attempted by unqualified
personnel can result in serious injury
or death by electrocution.
Electrical Grounding: Failure to provide
adequate grounding to this product
could result in serious injury or death
from electrocution.
See grounding instructions.
Never operate the compressor outdoors
when it is raining or in wet conditions.
Never operate compressor with
protective covers removed or damaged.
Any electrical wiring or repairs required
on this product should be performed by
authorized service center personnel in
accordance with national and local
electrical codes.
Make certain that the electrical circuit to
which the compressor is connected
provides proper electrical grounding,
correct voltage and adequate fuse
protection.
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 tank. Breathing these
contaminants can cause serious injury
or death.
Sprayed materials such as paint, paint
solvents, paint remover, insecticides,
weed killers, may contain harmful
vapors and poisons.
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.
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. Use a NIOSH/ MSHA
approved respirator designed for use with
your specific application.
How To Prevent It
What Could Happen
How To Prevent It
What Could Happen

6-ENGD27042
WARNING: Risk of Burns
Touching exposed metal such as the
compressor head 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
Never operate the compressor with
guards or covers which are damaged or
removed.
Moving parts such as the pulley, flywheel,
and belt can cause serious injury if they
come into contact with you or your
clothing.
WARNING: Risk of Falling
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.
HAZARD
HAZARD
HAZARD
Any repairs required on this product
should be performed by authorized
service center personnel.
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.
How To Prevent It
What Could Happen
How To Prevent It
What Could Happen
How To Prevent It
What Could Happen

7-ENG D27042
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 features of this
product.
Equip area of operation with a fire
extinguisher.
Do not operate machine with missing,
broken, or unauthorized parts.
WARNING: Risk of Unsafe Operation
Unsafe operation of your air compressor
could lead to serious injury or death to
you or others.
HAZARD
WARNING: Risk of Serious Injury or Property Damage When
Transporting Compressor
Oil can leak or spill and could result in
fire or breathing hazard; serious injury or
death can result. oil leaks will damage
carpet, paint or other surfaces in
vehicles or trailers.
Always place COMPRESSOR on a
protective mat when transporting to
protect against damage to vehicle from
leaks. Remove COMPRESSOR from
vehicle immediately upon arrival at your
destination.
(Fire, Inhalation, Damage to Vehicle Surfaces)
HAZARD
SAVE THESE INSTRUCTIONS
How To Prevent It
What Could Happen
How To Prevent It
What Could Happen

8-ENGD27042
Model No. C7550
Horsepower Peak 7.0
Voltage-Single Phase 240V
Minimum Branch Circuit Requirement 30 amps
*Fuse Type Time Delay
Air Tank Capacity, Gallons 80 ASME, Vertical
Approximate Cut-in Pressure 140 PSIG
Approximate Cut-out Pressure 175 PSIG
SCFM @ 100 psig 15.6
SCFM @ 175 psig 15.2
GLOSSARY
DUTY CYCLE
Accessories for this unit are available at the store the unit was purchased.
ACCESSORIES
Become familiar with these terms
before operating the unit.
CFM: Cubic feet per minute.
SCFM: Standard cubic feet per
minute; a unit of measure of air
delivery.
PSIG: Pounds per square inch gauge;
a unit of measure of pressure.
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 as you
continue to use your accessory.
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: Circuit carrying
electricity from electrical panel to
outlet.
To Lock Out Power: Place a lock on
the line power switch so no one else
can turn on the power.
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.
SPECIFICATIONS

Multi-Viscosity
motor oils, like 10W
30, should not be used in an air
compressor. They leave carbon
deposits on critical components,
thus reducing performance and
compressor life. Use air
compressor oil only.
NOTE: Oil is included with some
units. If oil is not included, use an oil
specifically formulated for use in an
air compressor, such as Porter-Cable
PAS1 air compressor oil. Oil may be
found at the store where the air
compressor was purchased.
1. Place unit on a level surface.
Drain tank to
release air pressure
before removing the oil fill cap or oil
drain plug.
2. Remove oil fill plug (A) and slowly
add a compressor oil to the
middle of sight glass (B). NOTE:
When filling the crankcase, the oil
flows very slowly into the pump.
If the oil is added too quickly, it
will overflow and appear to be
full. NOTE: Crankcase oil
capacity is approximately 48 fluid
ounces.
3. Replace oil fill plug.
A
B
9-ENG D27042
ASSEMBLY
Tools Required for Assembly
1 - 9/16" socket or open end wrench
1 - Electric drill
Unpacking
1. Remove all packaging.
It may be
necessary to brace
or support one side of the outfit
when removing the pallet because
the air compressor will have a
tendency to tip.
2. Remove and discard the (4)
screws and washers holding the
compressor to the pallet.
3. With the help of another person
carefully remove air compressor
from pallet and place on a level
surface.
Contents of Carton
1 - Air Compressor
1 - Parts bag containing:
1 - Operator’s Manual
1 - Parts Manual
4 - 5/8" Washers
To Add Oil To Pump
Compressors are
shipped with some
oil due to factory testing. Do not
operate this air compressor
without adding the correct amount
of oil to the pump crankcase.
Serious damage can result from
even the minimal operation if the
pump crankcase does not contain
the correct amount of oil. Make
sure the break-in procedure is
completed before operating the air
compressor.

10-ENGD27042
1. Place the air compressor on a
solid, level surface.
2. Mark the surface using the holes
in the air compressor feet as a
template.
3. Drill holes in the surface for the
concrete anchors. Install
concrete anchors.
4. Line-up holes in surface with
holes in air compressor feet.
5. Place the (4) washers (supplied)
between the floor and air
compressor feet. If needed, solid
shims may be placed between
the washers and floor to evenly
distribute weight on all four feet.
See next figure.
6. Place the (4) 3/8" lag screws
through the air compressor feet,
washers, shims, and into the
anchors.
7. Torque 3/8" lag screws to 7-10
ft.-lbs.
INSTALLATION
HOW TO SET UP YOUR UNIT
Location of the Air Compressor
• Locate the air compressor in a
clean, dry, and well ventilated
area.
• Located the air compressor at
least 12" away from the wall or
other obstructions that will
interfere with the flow of air.
• Locate the air compressor as
close to the main power supply
as possible to avoid using long
lengths of electrical wiring.
NOTE: Long lengths of electrical
wiring could cause power loss to
the motor.
• The air filter must be kept clear
of obstructions which could
reduce air flow to the air
compressor.
Anchoring of the Air
Compressor
Risk of Bursting.
Excessive Vibration
can weaken the air tank and cause
an explosion. The compressor
must be properly mounted.
The air compressor MUST be bolted
to a solid, level surface.
Hardware needed:
4 - Concrete anchors (not
supplied)
4 - 3/8" Lag screw to fit
concrete anchors
(not supplied)
4 - 5/8" Washer (supplied)
shims (if needed)
3/8" Lag
Screw
(not supplied)
5/8" Washer
(supplied)
Shim Under
Washer
(not supplied) Concrete Anchor
(not supplied)
Surface Line

11-ENG D27042
Voltage and Circuit Protection
Refer to the specification chart for the
voltage and minimum branch circuit
requirements.
GROUNDING
INSTRUCTIONS
This product should be connected to
a metallic, permanent wiring system,
of an equipment-grounding terminal
or lead on the product.
Wiring Instructions
Risk of Electrical
Shock. Improper
electrical grounding can result in
electrical shock. The wiring should
be done by a qualified electrician
A qualified electrician needs to knows
the following before wiring:
1. The amperage rating of the
electrical box should be
adequate. Refer to the
Specification Chart, in the parts
manual, for this information.
2. The supply line should have the
same electrical characteristics
(voltage, cycle, phase) as the
motor. Refer to the motor
nameplate, on side of motor, for
this information.
NOTE: The wiring must be the same
as the motor nameplate voltage plus
or minus 10%. Refer to local codes
for recommended wire sizes, correct
wire size, and maximum wire run;
undersize wire causes high amp draw
and overheating to the motor.
Risk of Electrical
Shock. Electrical
wiring must be located away from
hot surfaces such as manifold
assembly, compressor outlet tubes,
heads, or cylinders.

12-ENGD27042
Air Distribution System
Risk of Bursting.
Plastic or PVC pipe
is not designed for use with
compressed air. Regardless of its
indicated pressure rating, plastic
pipe can burst from air pressure.
Use only metal pipe for air
distribution lines.
The next figure represents a typical
air distribution system. The following
are tips to remember when setting up
the air compressor’s air distribution
system.
●Use pipe that is the same size as
the air tank outlet. Piping that is
too small will restrict the flow of
air.
●If piping is over 100 feet long,
use the next larger size.
●Bury underground lines below
the frost line and avoid pockets
where condensation can gather
and freeze. Apply pressure
before underground lines are
covered to make sure all pipe
joints are free of leaks.
●A flexible coupling is
recommended to be installed
between the air discharge outlet
and main air distribution line to
allow for vibration.
●A separate regulator is
recommended to control the air
pressure. Air pressure from the
tank is usually to high for
individual air driven tools.
DRAIN
TRAP
DRAIN
TRAPS
DRAIN
LEGS
MOISTURE
SEPARATOR
AND TRAP
DIRT
LEG
DIRT
LEG
LUBRICATOR
REGULATOR
FILTER
AIR DISCHARGE
VALVE
LUBRICATOR
MAIN DISTRIBUTION AIR LINES
Slope pipe in direction of air flow.
Water condensate flows along
bottom of pipe to drain legs,
preventing it from entering feeder
lines.
REGULATOR
FLEXIBLE
COUPLING
DRAIN COCK
VALVE
TYPICAL COMPRESSED
AIR DISTRIBUTION SYSTEM
AIR FLOW AIR FLOW
FEEDER LINES SLOPE
WITH AIR FLOW
AIR USAGE
LINES
AIR
COMPRESSOR

13-ENG D27042
Globe Valve
Tank
Pressure
Gauge
Safety Valve
On/Auto/Off
Switch
Pressure
Switch
Tank Pressure Gauge: The tank
pressure gauge indicates the reserve
air pressure in the tank.
Globe Valve (sold separately):
Opens and closes air discharge valve.
Turn knob counter-clockwise to open
and clockwise to close.
Regulator (sold separately, not
shown): An air pressure regulator or
a separate air transformer which
combines the functions of air
regulation and/or moisture and dirt
removal is recommended for most
applications.
Cooling System (not shown): This
compressor contains an advanced
design cooling system. At the heart
of this cooling system is an
engineered fan. It is perfectly normal
for this fan to blow air through the
vent holes in large amounts. You
know that the cooling system is
working when air is being expelled.
Description of Operation
Become familiar with these controls
before operating the unit.
On/Auto/Off Lever: Turn this switch
"On/Auto" to provide automatic
power to the pressure switch and
"Off" to remove power at the end of
each use.
Pressure Switch: The pressure
switch 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 compressor
at its "cut-out" pressure setting, the
safety valve will protect against high
pressure by "popping out" at its
factory set pressure (slightly higher
than the pressure switch "cut-out"
setting).
OPERATION
Know Your Air Compressor
READ THIS OWNER’S MANUAL AND SAFETY RULES BEFORE OPERATING
YOUR UNIT. Compare the illustrations with your unit to familiarize yourself with
the location of various controls and adjustments. Save this manual for future
reference.

14-ENGD27042
Air Compressor Pump (not shown):
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.
Drain Valve: The
drain valve is
located at the
base of the air
tank and is used
to drain condensation at the end of
each use.
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.
Pressure Release Valve: The
pressure release valve located on the
side of the pressure switch, is
designed to automatically release
compressed air from the compressor
head and the outlet tube when the air
compressor reaches "cut-out"
pressure or is shut off. The pressure
release valve allows the motor to
restart freely. When the motor stops
running, air will be heard escaping
from this valve for a few seconds.
No air should be heard leaking when
the motor is running or after the unit
reaches "cut-out" pressure.
Motor Overload Protector: This
motor has a manual 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. Place the On/Auto/Off lever in
the "Off" position.
2. Allow the motor to cool.
3. Depress the red reset button on
the motor.
4. Place the
On/Auto/Off
lever in the
"On/Auto"
postion to
restart the
motor.
Air Intake Filter (not shown): This
filter is designed to clean air coming
into the pump. This filter must always
be clean and ventilation openings
free from obstructions. See
"Maintenance".
Reset
Button
Drain
Valve
Check Valve
Pressure
Release
Valve
How to Use Your Unit
How to Stop:
1. Set the On/Auto/Off lever to
"Off".
Before Starting
Break-in Procedure
Risk of Unsafe
Operation. 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 and
when the check valve or a complete
compressor pump has been
replaced.
1. Make sure the On/Auto/Off lever
is in the "Off" position.

15-ENG D27042
2. Check oil level in pump. See
"Oil" paragraph in the
"Maintenance" section for
instructions.
3.
Recheck all wiring. Make sure
wires are secure at all terminals
connections. Make sure all
contacts move freely and are not
obstructed.
4. Open the globe valve fully to
permit air to escape and prevent
air pressure build up in the air
tank during the break-in period.
5. Move the On/Auto/Off lever to
"On/Auto" position. The
compressor will start.
6. Run the compressor for 20
minutes. Make sure the globe
valve is open and there is
minimal air pressure build-up in
tank.
7. Check all air line fittings and
connections/piping for air leaks
by applying a soap solution.
Correct if necessary. NOTE:
Minor leaks can cause the air
compressor to overwork,
resulting in premature breakdown
or inadequate performance.
8. Check for excessive vibration.
Readjust or shim air compressor
feet, if necessary.
9. After 20 minutes, close the globe
valve. The air receiver will fill to
"cut-out" pressure and the motor
will stop.
Before Each Start-Up:
1. Place On/Auto/Off lever to "Off".
2. Close the globe valve.
3. Attach hose and accessories.
NOTE: A regulator MUST be
installed when using accessories
rated at less than 175 PSI.
NOTE: The hose or accessory will
require a quick connect plug if the air
outlet is equipped with a quick
connect socket.
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.
How to Start:
1. Turn the On/Auto/Off lever to
"On/Auto" and allow tank
pressure to build. Motor will
stop when tank pressure reaches
"cut-out" pressure.
2. When the tank pressure reaches
"cut-out" pressure open the
globe valve.
IMPORTANT: When using regulator
and other accessories refer to the
manufacturers instructions.
The compressor is ready for use.

16-ENGD27042
MAINTENANCE
Customer Responsibilities
Daily or
after
each
use
Before
each
use
●
●
●
●
Every
8
hours
Every
40
hours
Every
100
hours
Yearly
Every
160
hours
●
●1
1- more frequent in dusty or humid conditions
Check Safety Valve
Drain Tank
Oil Leaks
Check Oil
Change Oil
Air Filter
NOTE: See "Operation" section for the location of controls.
To Check Safety Valve
Risk of Bursting. If
the safety valve
does not work properly, over-
pressurization may occur, causing
air tank rupture or an explosion.
Unusual Noise and/or
Vibration
Drive Belt-Condition
Motor Pulley/Flywheel alignment
Air compressor pump intake
and exhaust valves
Inspect air lines and fittings
for leaks
●
●
●
●
●
Head Bolts - Check the torques of the head bolts after the first five hours of operation.
1. Before starting compressor, pull
the ring on the safety valve to
make sure that the safety valve
operates freely. If the valve is
stuck or does not operate
smoothly, it must be replaced
with the same type of valve.
To ensure efficient operation and longer life of the air compressor, a routine
maintenance schedule should be prepared and followed. The above routine
maintenance schedule is geared to an air compressor in a normal working
environment operating on a daily basis. If necessary, the schedule should be
modified to suit the conditions under which your air compressor is used. The
modifications will depend upon the hours of operation and the working
environment. Compressors in an extremely dirty and/or hostile environment will
require a greater frequency of all maintenance checks.
Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to
voltage sources, compressed air, or moving parts. Before servicing unit
unplug or disconnect electrical supply to the air compressor, bleed tank
of pressure, and allow the air compressor to cool.

17-ENG D27042
To Drain Tank
NOTE: Operation of the air
compressor will cause condensation
to build up in the air tank. Always
drain tank on a washable surface or
in a suitable container to prevent
damaging or staining surfaces.
1. Set the On/Auto/Off lever to
"Off".
2. Close the globe valve.
3. Remove the air tool or accessory.
4. Open the globe valve and allow
the air to slowly bleed from the
air tank until tank pressure is
approximately 20 psi.
5. Close the globe valve.
6. Drain water from
air tank by opening
drain valve on
bottom of tank.
Risk
of
Bursting. Water will condense in
the air tank. If not drained, water
will corrode and weaken the air
tank causing a risk of air tank
rupture.
7. After the water has
been drained,
close the drain
valve. The air
compressor can
now be stored.
NOTE: If drain valve is
plugged, release all air pressure. The
valve can then be removed, cleaned,
then reinstalled.
Open Drain
Valve
Closed Drain
Valve
Checking
1. The oil level should be to the
middle of the sight glass (C).
2. If needed remove oil fill plug (A)
and slowly add oil until it reaches
the middle of the sight glass.
Changing
1. Remove the oil fill plug (A).
2. Remove the oil drain plug (B) and
drain oil into a suitable container.
3. Replace the oil drain plug (B) and
tighten securely.
4. Sowly add compressor oil until
the oil level is in the middle of
the sightglass (C). NOTE: When
filling the crankcase, the oil flows
very slowly into the pump. If the
oil is added too quickly, it will
overflow and appear to be full.
Risk of Unsafe
Operation.
Overfilling with oil will cause
premature compressor failure. Do
not overfill.
5. Replace oil fill plug (A) and
tighten securely.
Oil
NOTE: Use an oil specifically
formulated for use in an air
compressor, such as Porter-Cable
PAS1 air compressor oil. Oil may be
found at the store where the air
compressor was purchased.
NOTE: Crankcase oil capacity is
approximately 48 fluid ounces (1.4 L).
C
B
A

18-ENGD27042
Air Filter - Inspection and
Replacement
Hot surfaces. Risk
of burn.
Compressor heads are exposed
when filter cover is removed.
Allow compressor to cool prior to
servicing.
Keep the air filter
clean at all times.
Do not operate the air compressor
with the air filter removed.
A dirty air filter will not allow the
compressor to operate at full
capacity. Keep the air filter clean at
all times.
1. Remove air filter.
2. Remove the air filter cover.
3. Remove the air filter from filter
cover.
IMPORTANT: Do not operate the
compressor with the air filter
removed.
4. Place new air filter into filter
cover. Refer to the "Repair
Parts" for the correct part
number.
5. Replace air filter cover and
reassemble air filter to pump.
Belt - Replacement
(Refer to the Parts Manual for
replacement belt part number.)
Serious injury or
damage may
occur if parts of the body or loose
items get caught in moving parts.
Never operate the outfit with the
belt guard removed. The belt
guard should be removed only
when the air compressor power is
disconnected.
1. Turn air compressor off, lock out
the power supply, and relieve all
air pressure from the air tank.
2. Remove the belt guard.
3. Mark pump position on saddle.
4. Loosen the motor mounting
screws and slide the motor
toward the air compressor.
5. Remove the belt and replace
with a new one.
6. See the "Adjust Belt Tension"
before tightening motor mounting
screws.
Adjusting Belt Tension
1. Slide motor into original position,
line the motor up with the mark
made earlier on saddle.
2. Tighten two outside motor
mounting screws enough to hold
the motor in place for checking
pulley and flywheel alignment.
3. The belt should deflect 3/16" at
midway between the pulley and
the flywheel when a 5-10 pound
weight is applied at the midway
point.
3. When proper belt tension is
achieved, tighten all four motor
mounting screws. See Parts
manual for torque specifications.
NOTE: Once the engine pulley has
been moved from its factory set
location, the grooves of the
flywheel and pulley must be
aligned to within 1/16" to prevent
excessive belt wear. Verify the
alignment by performing the
following Pulley and Flywheel -
Alignment.
Downward Force
Deflection

19-ENG D27042
Air Compressor Pump
Intake and Exhaust Valves
Once a year have a Trained Service
Technician check the air compressor
pump intake and exhaust valves.
Inspect Air Lines and
Fittings for Leaks
1. Turn air compressor off, lock out
the power supply, and relieve all
air pressure from the air tank.
2. Apply a soap solution to all air
line fittings and
connections/piping.
3. Correct any leaks found.
IMPORTANT: Even minor leaks can
cause the air compressor to
overwork, resulting in premature
breakdown or inadequate
performance.
Motor Pulley/Flywheel
Alignment
NOTE: Once the motor pulley has
been moved from its factory set
location, the grooves of the flywheel
and pulley must be aligned to within
1/16" to prevent excessive belt wear.
The air compressor flywheel and
motor pulley must be in-line (in the
same plane) within 1/16" to assure
belt retention within flywheel belt
grooves. To check alignment,
perform the following steps:
1. Turn air compressor off, lock out
the power supply, and relieve all
air pressure from the air tank.
2. Remove belt guard.
3. Place a straightedge against the
outside of the flywheel and the
motor drive pulley.
4. Measure the distance between
the edge of the belt and the
straightedge at points A1 and A2
in figure. The difference between
measurements should be no
more than 1/16".
5. If the difference is greater than
1/16" loosen the set screw
holding the motor drive pulley to
the shaft and adjust the pulley’s
position on the shaft until the A1
and A2 measurements are within
1/16" of each other.
6. Tighten the motor drive pulley set
screw. See Parts manual for
torque specifications.
Air compressor Head Bolts -
Torquing
The air compressor pump head bolts
should be kept properly torqued.
Check the torques of the head bolts
after the first five hours of operation.
Retighten if necessary. See Parts
manual for torque specifications.
7. Visually inspect the motor drive
pulley to verify that it is
perpendicular to the drive motor
shaft. Points B1 and B2 of Figure
should appear to be equal. If
they are not, loosen the setscrew
of the motor drive pulley and
equalize B1 and B2, using care
not to disturb the belt alignment
performed in step 2.
8. Retighten the motor drive pulley
setscrew. See Parts manual for
torque specifications.
9. Reinstall belt guard.

20-ENGD27042
7. Clean or replace the check valve.
A solvent, such as paint or
varnish remover can be used to
clean the check valve.
8. Apply sealant to the check valve
threads. Reinstall the check valve
(turn clockwise).
9. Replace the pressure release
tube. Tighten nuts.
10. Replace the outlet tube and
tighten nuts.
11. Perform the Break-in Procedure.
See "Break-in Procedure" in the
Operation section.
To Replace or Clean Check
Valve
1. Release all air pressure from air
tank. See "To Drain Tank" in the
Maintenance section.
2. Turn air compressor off, lock out
the power supply, and relieve all
air pressure from the air tank.
3. Using an adjustable wrench
loosen outlet tube nut at air tank
and pump. Carefully move outlet
tube away from check valve.
4. Using an adjustable wrench
loosen pressure relief tube nut at
air tank and pressure switch.
Carefully move pressure relief
tube away from check valve.
5. Unscrew the check valve (turn
counterclockwise) using a 7/8"
open end wrench. Note the
orientation for reassembly.
6. Using a screwdriver, carefully
push the valve disc up and
down. NOTE: The valve disc
should move freely up and down
on a spring which holds the valve
disc in the closed position, if not
the check valve needs to be
cleaned or replaced.
In closed position
disc is visible.
In open
position
nothing is
visible.
Screwdriver
SERVICE AND ADJUSTMENTS
Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to
voltage sources, compressed air, or moving parts. Before servicing unit
unplug or disconnect electrical supply to the air compressor, bleed tank of
pressure, and allow the air compressor to cool.
ALL MAINTENANCE AND REPAIR OPERATIONS NOT LISTED MUST BE
PERFORMED BY TRAINED SERVICE TECHNICIAN.
Additional Service
Disassembly or service of the air
compressor beyond what is covered
in this manual is not recommended. If
additional service is required, contact
your nearest Authorized Warranty
Service Center.