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FIG. 1
B
FIG. 7A
FIG. 10
F
FIG. 10
FIG. 14
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 sensi-
tive 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 per-
sonal 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 turn 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. 6
FIG. 5
J
G
FIG. 11
FIG. 2
c
E
FIG. 8
H
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.
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:
•
ANSI Z87.1 eye protection (CAN/CSA Z94.3)
•
ANSI S12.6 (S3.19) hearing protection
•
NIOSH/OSHA/MSHA respiratory protection.
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.
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.).
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 Porter-
Cable Authorized Warranty Service Center. Please visit our Web Site www.deltaportercable.com for
a catalog or for the name of your nearest supplier.
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.
FIG. 3
FIG. 7
c
D
FIG. 9
E
G
H
I
FIG. 12
FIG. 13
TrOUBLESHOOTING
MAINTENANcE
SErvIcE
AccESSOrIES
THrEE YEAr LIMITED wArrANTY
FIG. 4
A
I
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