Porter-Cable 390, 390K, 392, 394 Instruction Manual
DEFINITIONS - SAFETY GUIDELINES
indicates an imminently hazardous situation which, if not avoid-
ed, 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 haz ard ous situation which, if not avoided,
may result in minor or mod er ate injury.
used without the safety alert symbol indicates potentially hazard-
ous situation which, if not avoided, may result in property damage.
To reduce the risk of injury, read the instruction manual.
GENERAL POWER TOOL SAFETY WARNINGS
Read all safety warnings and instructions Failure to follow the warnings
and instructions may result in electric shock, fire and/or serious injury.
Save all warningS and inStructionS
for future reference
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or
battery-operated (cordless) power tool.
1) WORK AREA SAFETY
a) Keep work area clean and well lit. Cluttered or dark areas invite accidents.
b) Do not operate power tools in explosive atmospheres, such as in the presence of flam-
mable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
c) Keep children and bystanders away while operating a power tool. Distractions can cause
you to lose control.
2) ELECTRICAL SAFETY
a) Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any
adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets
will reduce risk of electric shock.
b) Avoid body contact with earthed or grounded surfaces such as pipes, radiators, ranges
and refrigerators. There is an increased risk of electric shock if your body is earthed or
grounded.
c) Do not expose power tools to rain or wet conditions. Water entering a power tool will
increase the risk of electric shock.
d) Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power
tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled
cords increase the risk of electric shock.
e) When operating a power tool outdoors, use an extension cord suitable for outdoor use.
Use of a cord suitable for outdoor use reduces the risk of electric shock.
f) If operating a power tool in a damp location is unavoidable, use a ground fault circuit
interrupter (GFCI) protected supply. Use of a GFCI reduces the risk of electric shock.
3) PERSONAL SAFETY
a) Stay alert, watch what you are doing and use common sense when operating a power
tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol
or medication. A moment of inattention while operating power tools may result in serious per-
sonal injury.
b) Use personal protective equipment. Always wear eye protection. Protective equipment
such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate
conditions will reduce personal injuries.
c) Prevent unintentional starting. Ensure the switch is in the off position before connect-
ing to power source and/or battery pack, picking up or carrying the tool. Carrying power
tools with your finger on the switch or energising power tools that have the switch on invites
accidents.
d) Remove any adjusting key or wrench before turning the power tool on. A wrench or a key
left attached to a rotating part of the power tool may result in personal injury.
e) Do not overreach. Keep proper footing and balance at all times. This enables better control
of the power tool in unexpected situations.
f) Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing and
gloves away from moving parts. Loose clothes, jewellery or long hair can be caught in moving
parts.
g) If devices are provided for the connection of dust extraction and collection facilities,
ensure these are connected and properly used. Use of dust collection can reduce dust-
related hazards.
4) POWER TOOL USE AND CARE
a) Do not force the power tool. Use the correct power tool for your application. The correct
power tool will do the job better and safer at the rate for which it was designed.
b) Do not use the power tool if the switch does not turn it on and off. Any power tool that
cannot be controlled with the switch is dangerous and must be repaired.
c) Disconnect the plug from the power source and/or the battery pack from the power tool
before making any adjustments, changing accessories, or storing power tools. Such pre-
ventive safety measures reduce the risk of starting the power tool accidentally.
d) Store idle power tools out of the reach of children and do not allow persons unfamiliar
with the power tool or these instructions to operate the power tool. Power tools are dan-
gerous in the hands of untrained users.
e) Maintain power tools. Check for misalignment or binding of moving parts, breakage of
parts and any other condition that may affect the power tool’s operation. If damaged,
have the power tool repaired before use. Many accidents are caused by poorly maintained
power tools.
f) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting
edges are less likely to bind and are easier to control.
g) Use the power tool, accessories and tool bits etc., in accordance with these instructions
taking into account the working conditions and the work to be performed. Use of the
power tool for operations different from those intended could result in a hazardous situation.
5) SERVICE
a) Have your power tool serviced by a qualified repair person using only identical replace-
ment parts. This will ensure that the safety of the power tool is maintained.
ADDITIONAL SPECIFIC SAFETY RULES
• Hold power tools by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a “live” wire will make exposed
metal parts of the tool “live” and shock the operator.
• Do not sand metal of any kind with your sander. Sparks may be generated by sanding screws,
nails or other metals which may ignite dust particles.
• Do not wet sand with this sander. Liquids may enter the motor housing and cause electric
shock.
• Empty dust collection system frequently, especially when sanding resin-coated surfaces
such as polyurethane, varnish, shellac, etc. Dispose of coated dust particles according to
the finish manufacturer’s guidelines, or place in a metal can with a tight fitting metal lid. Remove
coated dust particles from the premises daily. The accumulation of fine sanding dust particles
may self ignite and cause fire.
• Do not operate this tool for long periods of time. Vibration caused by the operating action of this
tool may cause permanent injury to fingers, hands, and arms. Use gloves to provide extra cushion,
take frequent rest periods, and limit daily time of use.
• Sanding of lead-based paint, chemically pressure treated lumber or other materials that may
contain carcinogens is not recommended. Sanding of these materials should only be performed
by a professional.
• Clean out your tool often, especially after heavy use. Dust and grit containing metal particles
often accumulate on interior surfaces and could create a risk of serious injury, electric shock or electrocution. Always disconnect the sander from the power source before cleaning. Always wear safety
glasses that conform to ANSI Z87.1.
• Always disconnect tool from the power source before changing abrasive sheets. Such preven-
tive safety measures reduce the risk of starting the power tool accidentally.
EXTENSION CORD
An extension cord must have adequate wire size (AWG or American Wire Gauge) for safety.
The smaller the gauge number of the wire, the greater the capacity of the cable, that is 16 gauge
has more capacity than 18 gauge. An undersized cord will cause a drop in line voltage resulting in
loss of power and overheating. When using more than one extension to make up the total length, be
sure each individual extension contains at least the minimum wire size. The following table shows
the correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the
next heavier gauge. The smaller the gauge number, the heavier the cord.
Minimum Gauge for Cord Sets
Ampere Rating
Volts Total Length of Cord in Feet (meters)
120V
25 (7.6) 50 (15.2) 100 (30.5) 150 (45.7)
240V
50 (15.2) 100 (30.5) 200 (61.0) 300 (91.4)
More
Than
Not More
Than
AWG
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12 Not Recommended
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 examples of these chemicals are:
• leadfromlead-basedpaint.
• crystallinesilicafrombricksandcement andothermasonryproducts.
• arsenicandchromiumfromchemically-treatedlumber(CCA).
Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To
reduce your exposure to these chemicals: work in a well ventilated area with approved safety equipment,
such as dust masks that are specially designed to filter out microscopic particles.
Avoid prolonged contact with dust from power sanding, sawing, grinding, drilling, and other
construction activities. Wear protective clothing and wash exposed areas with soap and water. Allowing
dust to get into your mouth, eyes, or lay on the skin may promote absorption of harmful chemicals.
Use of this tool can generate and/or disburse dust, which may cause serious and permanent respiratory damage or other injury. Always use NIO SH/OSHA/MSHA approved respiratory protection
appropriate for the dust exposure. Direct particles away from face and body.
ALWAYS wear proper personal hearing protection that conforms to ANSI S12.6 (S3.19) during
use. Under some conditions and duration of use, noise from this product may contribute to hearing loss.
ALWAYS USE SAFETY GLASSES. (ANSI Z87.1) and (CAN/CSA Z94.3) Everyday eyeglasses are NOT safety glasses. Also use face or dust mask if cutting operation is dusty. ALWAYS WEAR
CERTIFIED SAFETY EQUIPMENT:
• ANSIZ87.1eyeprotection(CAN/CSAZ94.3)
• ANSIS12.6(S3.19)hearingprotection
• NIOSH/OSHA/MSHArespiratoryprotection
SYMBOLS
The label on your tool may include the following symbols.
The symbols and their definitions are as
follows:
V ....................... volts A ................. amperes
Hz .................... hertz W ................ watts
min ................... minutes
.............. alternating current
................ direct current .............. alternating or direct current
..................... Class I Construction
n
o ............... no load speed
......................... (grounded)
...............earthing terminal
....................Class II Construction ...............safety alert symbol
......................... (double insulated) BPM ...........beats per minute
…/min .............. per minute RPM ........... revolutions per minute
OPM ................ orbits per minute
ADDITIONAL SAFETY RULES FOR PAINT REMOVAL
1. Sanding of lead based paint is NOT RECOMMENDED due to the difficulty of controlling the
contaminated dust. The greatest danger of lead poisoning is to children and pregnant women.
2. Since it is difficult to identify whether or not a paint contains lead without a chemical analysis, we
recommend the following precautions when sanding any paint:
PERSONAL SAFETY
1. No children or pregnant women should enter the work area where the paint sanding is being
done until all clean up is completed.
2. A dust mask or respirator should be worn by all persons entering the work area. The filter should
be replaced daily or whenever the wearer has difficulty breathing. See your local hardware store
for the proper NIOSH approved dust mask.
3. NO EATING, DRINKING or SMOKING should be done in the work area to prevent ingesting
contaminated paint particles. Workers should wash and clean up BEFORE eating, drinking
or smoking. Articles of food, drink, or smoking should not be left in the work area where dust
would settle on them.
ENVIRONMENTAL SAFETY
1. Paint should be removed in such a manner as to minimize the amount of dust generated.
2. Areas where paint removal is occurring should be sealed with plastic sheeting of 4 mil thickness.
3. Sanding should be done in a manner to reduce tracking of paint dust outside the work area.
CLEANING AND DISPOSAL
1. All surfaces in the work area should be vacuumed and thoroughly cleaned daily for the duration
of the sanding project. Vacuum filter bags should be changed frequently.
2. Plastic drop cloths should be gathered up and disposed of along with any dust chips or other
removal debris. They should be placed in sealed refuse receptacles and disposed of through
regular trash pick-up procedures. During clean up, children and pregnant women should be
kept away from the immediate work area.
3. All toys, washable furniture and utensils used by children should be washed thoroughly before
being used again.
Save theSe inStructionS
MOTOR
Be sure your power supply agrees with the voltage marked on the nameplate. 120 Volts AC 60Hz
means alternating current only. Voltage decrease of more than 10% will cause loss of power and
over heating. All
Porter Cable tools are factory-tested. If this tool does not operate, check the power
supply line for blown fuses and the plug and receptacle for proper contact.
Accessories must be rated for at least the speed recommended on the tool warning label.
Accessories running over rated speed can fly apart and cause injury. Accessory ratings must always be
above tool speed as shown on tool nameplate.
OPERATION
To reduce the risk of injury, turn unit off and disconnect it from power source
before installing and removing accessories, before adjusting or when making repairs. An acci-
dental start-up can cause injury.
Never modify any parts of the power tool. Damage or personal injury could result.
390
390K
392
394
Part No. A28835 - 10-10-08 Rev. A
Copyright © 2008 Porter-Cable
INSTRUCTIVO DE OPERACIÓN,
CENTROS DE SERVICIO Y PÓLIZA
DE GARANTÍA.
LÉASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.
o
F
F
5" (127 mm)
LOW PROFILE
PALM GRIP SANDER
Lijadora de perfil bajo con
agarradera para la palma de
la mano de 127 mm (5 pulg)
Ponceuse compacte à
poignée ronde ergonomique
de 127 mm (5 po)
Instruction manual
Manuel d'instructions
Manual de'instrucciones
www.deltaportercable.com
ATTACHING ABRASIVE PAPER
Model 390: Use 5"(127 mm) sanding discs with an 8-hole dust extraction pattern which attach to
the sander with hook and loop.
Model 392: Use 5" (127 mm) no-hole sanding discs which attach to the sander with pressure sensitive adhesive. (Dust collection not possible with this model.)
Model 394: Use 5" (127 mm) sanding discs with an 8-hole dust extraction pattern which attach to
the sander with pressure sensitive adhesive.
Turn off and unplug the tool before making any adjustments or removing or installing
attachments or accessories. Be sure the switch is in the “OFF” position.
1. Turn the sander over so that the sanding pad is facing upward (Fig. 1).
2. Clean the dust from the vinyl pad face.
3. Hold the pad with one hand to keep it from rotating (Fig. 2).
4. With the other hand, align the holes and place the disc directly on top of the pad (Fig. 3).
NOTE: Do not use the sanding screen (the screen used for sanding drywall) directly on the hook and
loop pad. The screen will not hold and will damage the hooks on the pad. The hooks will wear very
rapidly if left in contact with the work surface while the tool is operating.
SWITCH
To reduce the risk of injury, make sure the sander is not resting on the workpiece when
the switch is turned on.
To turn unit on, depress the side of the dust-protected switch (A) Fig. 4 that reads “ON” and cor-
responds to the symbol “I.” To turn the unit off, depress the side of the switch that reads “OFF” and
corresponds with the symbol “O.”
SPEED CONTROL DIAL
The speed control dial (B) Fig. 5 allows you to increase or decrease the speed from 7,000-12,000
orbits per minute. The optimal speed setting for each application is very much dependent on personal preference. Generally, you will want to use a higher setting on harder materials and a lower
setting on softer materials. Material removal rate increases as speed increases.
PAD BRAKE
These sanders are equipped with a pad brake that prevents over-speeding of the pad. If the tool is
lifted off the work surface while the motor is running, the brake will limit pad rotation to no more than
500 RPM.
The plastic pad brake is used to provide the braking action. Eventually, this brake may require
replacement. If the brake fails to limit pad rotation, send the sander to a Porter-Cable service facility
or replace the brake yourself using the information under Brake Replacement in the Maintenance
section of this manual.
DUST COLLECTION
To reduce the risk of injury, turn unit off and disconnect it from power source before
installing and removing accessories, before adjusting or when making repairs. An accidental
start-up can cause injury.
To reduce the risk of serious personal injury, NEVER operate this tool with perforated
paper unless the dust collection system is in place.
Empty dust collection system frequently, especially when sanding resin-coated surfaces
such as polyurethane, varnish, shellac, etc. Dispose of coated dust particles according to the finish
manufacturer’s guidelines, or place in a metal can with a tight fitting metal lid. Remove coated dust
particles from the premises daily. The accumulation of fine sanding dust particles may self ignite and
cause fire.
To use the dust collection system, install the dust container assembly (C and D) Fig. 6 on the dust port
(E) as far as it will go. To empty the dust container, remove it and empty it into a trash receptacle.
NOTE: Dust collection is not possible with the 392 Model sander because its dust port (E) Fig. 8 is
covered and there are no holes in the backing pad.
NOTE: To use your shop vacuum with the dust collection system, remove the dust container (D) Fig.
6 by twisting it and pulling it away from the adapter. Remove the black tag (J) Fig. 7A, and attach
your vacuum hose directly to the adapter port (C) (Fig. 7).
USING THE SANDER
To operate your sander, grasp it as shown in Fig. 9 and tur n it on. Move it in long, sweeping strokes
along the surface, letting it do the work. Be sure to check your work often. This sander is capable of
removing material rapidly, especially with coarse paper.
The random orbital action of your sander allows you to sand with the grain or at any angle across
it for most sanding jobs. To produce the best finish possible, start with coarse grit sandpaper and
change gradually to finer and finer paper. Vacuum and wipe the surface with a tack cloth between grit
steps. Your sander is designed to sand into small or confined areas. Its small size and light weight
make it ideal for overhead work.
The rate at which the dust container fills will vary with your workpiece and the coarsness of the
sandpaper. For best results, empty the container frequently. When sanding painted surfaces (see
Additional Safety Rules for Paint Removal), you may find that the sandpaper clogs with paint. A heat
gun will work much better to remove paint before sanding. FOLLOW ALL THE SAFETY INSTRUC-
TIONS IN THE HEAT GUN INSTRUCTION MANUAL.
FIG. 1
FIG. 2
FIG. 3
FIG. 4
A
FIG. 5
B
FIG. 6
C
D
E
FIG. 7
C
FIG. 8
E
FIG. 9
FIG. 10
F
FIG. 10
FIG. 11
G
FIG. 12
FIG. 13
FIG. 14
H
I
H
G
TROUBLESHOOTING
For assistance with your tool, visit our website at www.deltaportercable.com for a list of service centers,
or call the Porter-Cable Customer Care Center at (888) 848-5175.
MAINTENANCE
To reduce the risk of injury, turn unit off and disconnect it from power source before
installing and removing accessories, before adjusting or when making repairs. An accidental start-up
can cause injury.
ALWAYS USE SAFETY GLASSES. Everyday eyeglasses are NOT safety glasses. Also use
face or dust mask if cutting operation is dusty. ALWAYS wear certified safety equipment:
• ANSIZ87.1eyeprotection(CAN/CSAZ94.3)
• ANSIS12.6(S3.19)hearingprotection
• NIOSH/OSHA/MSHArespiratoryprotection.
REPAIRS
For assistance with your tool, visit our website at www.deltaportercable.com for a list of service centers,
or call the Porter-Cable Customer Care Center at (888) 848-5175.
CHANGING BACK-UP PAD
1. DISCONNECT TOOL FROM POWER SOURCE.
2. Grasp pad with hand and use a Torx T20 driver to remove three pad retaining screws (F),
Fig. 10.
3. Lift pad from sander.
4. Reverse procedure to install new pad. Tighten pad retaining screws to 22 to 26 in-lbs.
BRAKE REPLACEMENT
1. DISCONNECT TOOL FROM POWER SOURCE.
2. Remove back-up pad (see Changing Back-Up Pad).
3. Remove old brake (G) Fig. 11.
4. Insert new brake by lining up two keyed areas (H) Figs. 12 and 13 in brake (G) with slots (I) in the
sander housing. Hold these keyed areas down with your thumbs (Fig. 14) and then work the
pad’s edges around the lip of the sander housing. Attached brake should look like Fig. 11.
5. Reassemble back-up pad (see Changing Back-Up Pad).
CLEANING
Periodically blowing dust and chips out of the motor housing using clean, dry compressed
air is a suggested maintenance procedure. To reduce the risk of serious personal injury, ALWAYS wear
ANSI Z87.1 safety glasses while using compressed air.
When cleaning, use only mild soap and a damp cloth on plastic parts. Many household
cleaners contain chemicals which could seriously damage plastic. Also, do not use gasoline, turpentine,
lacquer, paint thinner, dry cleaning fluids or similar products which may seriously damage plastic parts.
NEVER let any liquid get inside the tool; NEVER immerse any part of the tool into a liquid.
FAILURE TO START
Should your tool fail to start, check to make sure the prongs on the cord plug are making good contact in
the outlet. Also, check for blown fuses or open circuit breakers in the line.
USE WITH GENERATORS: In rare cases the idle mode of a generator might not start the sander. If this
occurs, turn off the sander and turn off idle mode of the generator. Then try starting the sander again.
LUBRICATION
This tool has been lubricated with a sufficient amount of high grade lubricant for the life of the unit under
normal operating conditions. No further lubrication is necessary.
SERVICE
REPLACEMENT PARTS
Use only identical replacement parts. For a parts list or to order parts, visit our service website
at www.deltaportercableservicenet.com. You can also order parts from your nearest Porter-Cable
Factory Service Center or Porter-Cable Authorized Warranty Service Center. Or, you can call our
Customer Care Center at (888) 848-5175.
SERVICE AND REPAIRS
All quality tools will eventually require servicing and/or replacement of parts. For information about
Porter-Cable, its factory service centers or authorized warranty service centers, visit our website at www.
deltaportercable.com or call our Customer Care Center at (888) 848-5175. All repairs made by our service
centers are fully guaranteed against defective material and workmanship. We cannot guarantee repairs
made or attempted by others.
You can also write to us for information at PORTER-CABLE, 4825 Highway 45 North, Jackson, Tennessee
38305 - Attention: Product Service. Be sure to include all of the information shown on the nameplate of
your tool (model number, type, serial number, etc.).
ACCESSORIES
Since accessories, other than those offered by Porter-Cable, have not been tested with
this product, use of such accessories with this tool could be hazardous. To reduce the risk of injury,
only Porter-Cable recommended accessories should be used with this product.
A complete line of accessories is available from your Porter-Cable Factory Service Center or a PorterCable Authorized Warranty Service Center. Please visit our Web Site www.deltaportercable.com for
a catalog or for the name of your nearest supplier.
THREE YEAR LIMITED WARRANTY
PORTER-CABLE will repair, without charge, any defects due to faulty materials or workmanship for three
years from the date of purchase. This warranty does not cover part failure due to normal wear or abuse.
For further detail of warranty coverage and warranty repair information, visit www.deltaportercable.com or
call (888) 848-5175. 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.
I
FIG. 7A
J
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