Delta (Model 31-300) User manual

INSTRUCTION MANUAL
PART NO. 913131 -04-12-05
Copyright © 2005 Delta Machinery
To learn more about DELTA MACHINERY
visit our website at: www.deltamachinery.com.
For Parts, Service, Warranty or other Assistance,
please call 1-800-223-7278 (In Canada call 1-800-463-3582).
Sanding Center
6" Belt/12" Disc Sander
(Model 31-300)

2
TABLE OF CONTENTS
Read and understand all warnings and operating instructions before using any tool or equipment. When
using tools or equipment, basic safety precautions should always be followed to reduce the risk of personal injury.
Improper operation, maintenance or modification of tools or equipment could result in serious injury and property
damage. There are certain applications for which tools and equipment are designed. Delta Machinery strongly
recommends that this product NOT be modified and/or used for any application other than for which it was designed.
If you have any questions relative to its application DO NOT use the product until you have written Delta Machinery
and we have advised you.
Online contact form at www.deltamachinery.com
Postal Mail: Technical Service Manager
Delta Machinery
4825 Highway 45 North
Jackson, TN 38305
(IN CANADA: 505 SOUTHGATE DRIVE, GUELPH, ONTARIO N1H 6M7)
Information regarding the safe and proper operation of this tool is available from the following sources:
Power Tool Institute
1300 Sumner Avenue, Cleveland, OH 44115-2851
www.powertoolinstitute.org
National Safety Council
1121 Spring Lake Drive, Itasca, IL 60143-3201
American National Standards Institute, 25 West 43rd Street, 4 floor, New York, NY 10036 www.ansi.org
ANSI 01.1Safety Requirements for Woodworking Machines, and
the U.S. Department of Labor regulations www.osha.gov
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS!
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
GENERAL SAFETY RULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
ADDITIONAL SPECIFIC SAFETY RULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
CARTON CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
SERVICE CENTER LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .back cover

3
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 potentially hazardous situation which, if not avoided, may
result in property damage.
It is important for you to read and understand this manual. The information it contains relates to protecting
YOUR SAFETY and PREVENTING PROBLEMS. The symbols below are used to help you recognize this
information.
SAFETY GUIDELINES - DEFINITIONS
SOME DUST CREATED BY POWER SANDING, SAWING, GRINDING, DRILLING, AND OTHER
CONSTRUCTION ACTIVITIES contains chemicals known to cause cancer, birth defects or other reproductive harm.
Some examples of these chemicals are:
· lead from lead-based paints,
· crystalline silica from bricks and cement and other masonry products, and
· 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 NIOSH/OSHA
approved, properly fitting face mask or respirator when using such tools.
CALIFORNIA PROPOSITION 65

4
GENERAL SAFETY RULES
READ AND UNDERSTAND ALL WARNINGS AND OPERATING INSTRUCTIONS BEFORE
USING THIS EQUIPMENT. Failure to follow all instructions listed below, may result in electric shock,
fire, and/or serious personal injury or property damage.
IMPORTANT SAFETY INSTRUCTIONS
1. FOR YOUR OWN SAFETY, READ THE INSTRUCTION
MANUAL BEFORE OPERATING THE MACHINE.
Learning the machine’s application, limitations, and
specific hazards will greatly minimize the possibility of
accidents and injury.
2. WEAR EYE AND HEARING PROTECTION.
ALWAYS USE SAFETY GLASSES. Everyday
eyeglasses are NOT safety glasses. USE CERTIFIED
SAFETY EQUIPMENT. Eye protection equipment
should comply with ANSI Z87.1 standards. Hearing
equipment should comply with ANSI S3.19
standards.
3. WEAR PROPER APPAREL. Do not wear loose
clothing, gloves, neckties, rings, bracelets, or other
jewelry which may get caught in moving parts. Nonslip
footwear is recommended. Wear protective hair
covering to contain long hair.
4. DO NOT USE THE MACHINE IN A DANGEROUS
ENVIRONMENT. The use of power tools in damp or
wet locations or in rain can cause shock or
electrocution. Keep your work area well-lit to prevent
tripping or placing arms, hands, and fingers in danger.
5. MAINTAIN ALL TOOLS AND MACHINES IN PEAK
CONDITION. Keep tools sharp and clean for best and safest
performance. Follow instructions for lubricating and changing
accessories. Poorly maintained tools and machines can further
damage the tool or machine and/or cause injury.
6. CHECK FOR DAMAGED PARTS. Before using the
machine, check for any damaged parts. Check for
alignment of moving parts, binding of moving parts,
breakage of parts, and any other conditions that may
affect its operation. A guard or any other part that is
damaged should be properly repaired or replaced.
Damaged parts can cause further damage to the
machine and/or injury.
7. KEEP THE WORK AREA CLEAN. Cluttered areas and
benches invite accidents.
8. KEEP CHILDREN AND VISITORS AWAY. Your shop is a
potentially dangerous environment. Children and visitors can
be injured.
9. REDUCE THE RISK OF UNINTENTIONAL STARTING.
Make sure that the switch is in the “OFF” position
before plugging in the power cord. In the event of a
power failure, move the switch to the “OFF” position.
An accidental start-up can cause injury.
10. USE THE GUARDS. Check to see that all guards are
in place, secured, and working correctly to reduce
the risk of injury.
11. REMOVE ADJUSTING KEYS AND WRENCHES
BEFORE STARTING THE MACHINE. Tools, scrap
pieces, and other debris can be thrown at high speed,
causing injury.
12. USE THE RIGHT MACHINE. Don’t force a machine or
an attachment to do a job for which it was not
designed. Damage to the machine and/or injury may
result.
13. USE RECOMMENDED ACCESSORIES. The use of
accessories and attachments not recommended by
Delta may cause damage to the machine or injury to the
user.
14. USE THE PROPER EXTENSION CORD. Make sure
your extension cord is in good condition. When using
an extension cord, be sure to use one heavy enough to
carry the current your product will draw. An undersized
cord will cause a drop in line voltage, resulting in loss of
power and overheating. See the Extension Cord Chart
for the correct size depending on the cord length and
nameplate ampere rating. If in doubt, use the next
heavier gauge. The smaller the gauge number, the
heavier the cord.
15. SECURE THE WORKPIECE. Use clamps or a vise to hold
the workpiece when practical. Loss of control of a
workpiece can cause injury.
16. FEED THE WORKPIECE AGAINST THE DIRECTION OF
THE ROTATION OF THE BLADE, CUTTER, OR ABRASIVE
SURFACE. Feeding it from the other direction will cause
the workpiece to be thrown out at high speed.
17. DON’T FORCE THE WORKPIECE ON THE MACHINE.
Damage to the machine and/or injury may result.
18. DON’T OVERREACH. Loss of balance can make you
fall into a working machine, causing injury.
19. NEVER STAND ON THE MACHINE. Injury could occur if the
tool tips, or if you accidentally contact the cutting tool.
20. NEVER LEAVE THE MACHINE RUNNING UNATTENDED.
TURN THE POWER OFF. Don’t leave the machine until it
comes to a complete stop. A child or visitor could be injured.
21. TURN THE MACHINE “OFF”, AND DISCONNECT THE
MACHINE FROM THE POWER SOURCE before installing
or removing accessories, before adjusting or changing
set-ups, or when making repairs. An accidental start-up
can cause injury.
22. MAKE YOUR WORKSHOP CHILDPROOF WITH
PADLOCKS, MASTER SWITCHES, OR BY
REMOVING STARTER KEYS. The accidental start-up
of a machine by a child or visitor could cause injury.
23. STAY ALERT, WATCH WHAT YOU ARE DOING, AND
USE COMMON SENSE. DO NOT USE THE
MACHINE WHEN YOU ARE TIRED OR UNDER THE
INFLUENCE OF DRUGS, ALCOHOL, OR MEDICAT-
ION. A moment of inattention while operating power
tools may result in injury.
24. USE OF THIS TOOL CAN GENERATE
AND DISBURSE DUST OR OTHER AIRBORNE
PARTICLES, INCLUDING WOOD DUST,
CRYSTALLINE SILICA DUST AND ASBESTOS DUST.
Direct particles away from face and body. Always
operate tool in well ventilated area and provide for
proper dust removal. Use dust collection system
wherever possible. Exposure to the dust may cause
serious and permanent respiratory or other injury,
including silicosis (a serious lung disease), cancer, and
death. Avoid breathing the dust, and avoid prolonged
contact with dust. Allowing dust to get into your mouth
or eyes, or lay on your skin may promote absorption of
harmful material. Always use properly fitting
NIOSH/OSHA approved respiratory protection
appropriate for the dust exposure, and wash exposed
areas with soap and water.

5
FAILURE TO FOLLOW THESE RULES MAY RESULT IN SERIOUS PERSONAL INJURY.
ADDITIONAL SPECIFIC SAFETY RULES
SAVE THESE INSTRUCTIONS.
Refer to them often and use them to instruct others.
1. DO NOT OPERATE THIS MACHINE until it is
completely assembled and installed according to
the instructions. A machine incorrectly assembled
can cause serious injury.
2. OBTAIN ADVICE from your supervisor, instructor, or
another qualified person if you are not thoroughly
familiar with the operation of this machine.
Knowledge is safety.
3. FOLLOW ALL WIRING CODES and recommended
electrical connections to prevent shock or electrocu-
tion.
4. NEVER TURN THE MACHINE “ON” before
clearing the table/work area of all objects (tools,
scraps of wood, etc.). Flying debris is dangerous.
5. NEVER TURN THE MACHINE “ON” with the work-
piece contacting the abrasive surface. Kickback can
occur.
6. SECURE THE MACHINE to a supporting surface. Vibra-
tion can cause the machine to slide, walk, or tip
over.
7. COVER THE POWER TAKE-OFF SHAFT when not
using accessories. Unguarded rotating shafts can
create an entanglement hazard which can result in
injury.
8. USE A DUST COLLECTION SYSTEM. Some types
of wood are known to cause disease or other health
problems.
9. CLEAN THE MACHINE and dust collector thoroughly
when processing different types of workpieces
(wood, steel, or aluminum). Combining wood and
metal dust can create an explosion or fire hazard.
DO NOT SAND OR POLISH MAGNESIUM. Fire will
result.
10. PREVENT THE WORKPIECE from contacting the
sanding belt before starting the tool. Loss of control
of the workpiece is dangerous.
11. AVOID AWKWARD OPERATIONS AND HAND
POSITIONS. A sudden slip could cause a hand to
move into the abrasive disc or belt.
12. MAINTAIN A MAXIMUM CLEARANCE OF 1/16" be-
tween the table and the abrasive disc. The
workpiece could be drawn into the space between
the abrasive disc and the table.
13. SUPPORT THE WORKPIECE firmly with a miter
gauge, backstop, or work table when sanding with a
belt. Hold the workpiece firmly. Loss of control of the
workpiece can result in injury.
14. AVOID KICKBACK by sanding in accordance with
the directional arrows. Feed the workpiece against
the downward rotation side of the disc or the
forward rotation of the belt. Loss of control of the
workpiece can result in injury.
15. DO NOT SAND very small or very thin workpieces
that cannot be safely controlled. Loss of control of
the workpiece can result in injury.
16. PROPERLY SUPPORT LONG OR WIDE WORK-
PIECES. Loss of control of the workpiece is dan-
gerous.
17. NEVER PERFORM LAYOUT, ASSEMBLY, OR SET-UP
WORK on the table/work area when the machine is
running. A sudden slip could cause a hand to move
into the abrasive surface. Severe injury can result.
18. TURN THE MACHINE “OFF”, disconnect the
machine from the power source, and clean the
table/work area before leaving the machine. LOCK
THE SWITCH IN THE “OFF” POSITION to prevent
unauthorized use. Someone else might accidentally
start the machine and cause injury to themselves.
19. ADDITIONAL INFORMATION regarding the safe
and proper operation of power tools (i.e. a safety
video) is available from the Power Tool Institute,
1300 Sumner Avenue, Cleveland, OH 44115-2851
(www.powertoolinstitute.com). Information is also
available from the National Safety Council, 1121
Spring Lake Drive, Itasca, IL 60143-3201. Please
refer to the American National Standards Institute
ANSI 01.1 Safety Requirements for Woodworking
Machines and the U.S. Department of Labor OSHA
1910.213 Regulations.

6
A separate electrical circuit should be used for your machines. This circuit should not be less than #12 wire and should
be protected with a 20 Amp time lag fuse. If an extension cord is used, use only 3-wire extension cords which have 3-
prong grounding type plugs and matching receptacle which will accept the machine’s plug. Before connecting the
machine to the power line, make sure the switch (s) is in the “OFF” position and be sure that the electric current is of
the same characteristics as indicated on the machine. All line connections should make good contact. Running on low
voltage will damage the machine.
DO NOT EXPOSE THE MACHINE TO RAIN OR OPERATE THE MACHINE IN DAMP LOCATIONS.
Fig. A Fig. B
GROUNDED OUTLET BOX
CURRENT
CARRYING
PRONGS
GROUNDING BLADE
IS LONGEST OF THE 3 BLADES
GROUNDED OUTLET BOX
GROUNDING
MEANS
ADAPTER
2. Grounded, cord-connected machines intended for
use on a supply circuit having a nominal rating less
than 150 volts:
If the machine is intended for use on a circuit that has an
outlet that looks like the one illustrated in Fig. A,the
machine will have a grounding plug that looks like the plug
illustrated in Fig. A. A temporary adapter, which looks like
the adapter illustrated in Fig. B, may be used to connect
this plug to a matching 2-conductor receptacle as shown
in Fig. B if a properly grounded outlet is not available. The
temporary adapter should be used only until a properly
grounded outlet can be installed by a qualified electrician.
The green-colored rigid ear, lug, and the like, extending
from the adapter must be connected to a permanent
ground such as a properly grounded outlet box. Whenever
the adapter is used, it must be held in place with a metal
screw.
NOTE: In Canada, the use of a temporary adapter is not
permitted by the Canadian Electric Code.
IN ALL CASES, MAKE CERTAIN THE
RECEPTACLE IN QUESTION IS PROPERLY
GROUNDED. IF YOU ARE NOT SURE HAVE A
QUALIFIED ELECTRICIAN CHECK THE RECEPTACLE.
1. All grounded, cord-connected machines:
In the event of a malfunction or breakdown, grounding
provides a path of least resistance for electric current to
reduce the risk of electric shock. This machine is
equipped with an electric cord having an equipment-
grounding conductor and a grounding plug. The plug must
be plugged into a matching outlet that is properly installed
and grounded in accordance with all local codes and
ordinances.
Do not modify the plug provided - if it will not fit the outlet,
have the proper outlet installed by a qualified electrician.
Improper connection of the equipment-grounding
conductor can result in risk of electric shock. The
conductor with insulation having an outer surface that is
green with or without yellow stripes is the equipment-
grounding conductor. If repair or replacement of the
electric cord or plug is necessary, do not connect the
equipment-grounding conductor to a live terminal.
Check with a qualified electrician or service personnel if
the grounding instructions are not completely
understood, or if in doubt as to whether the machine is
properly grounded.
Use only 3-wire extension cords that have 3-prong
grounding type plugs and matching 3-conductor
receptacles that accept the machine’s plug, as shown in
Fig. A.
Repair or replace damaged or worn cord immediately.
POWER CONNECTIONS
MOTOR SPECIFICATIONS
Your machine is wired for 120 volts, 60 HZ alternating current. Before connecting the machine to the power source,
make sure the switch is in the “OFF” position.
GROUNDING INSTRUCTIONS
THIS MACHINE MUST BE GROUNDED WHILE IN USE TO PROTECT THE OPERATOR FROM
ELECTRIC SHOCK.

7
3. 240 VOLT SINGLE PHASE OPERATION
The motor supplied with your saw is a dual voltage,
120/240 volt motor. It is set at the factory at 120 volts. If
it is desired to operate your machine at 240 volts, single
phase, it is necessary to reconnect the motor leads in
the motor junction box by following instructions given on
the motor nameplate.
MAKE SURE MOTOR IS
DISCONNECTED FROM POWER SOURCE BEFORE
RECONNECTING MOTOR LEADS.
It is also necessary to replace the 120 volt plug, supplied
with the motor, with a UL/CSA listed plug suitable for
240 volts and the rated current of your machine as
illustrated in Fig. C. Contact your local Authorized Delta
Service Center or qualified electrician for proper
procedures to install the plug. The machine must comply
with all local and national electrical codes after the 240
volt plug is installed.
The machine with a 240 volt plug should only be
connected to an outlet having the same configuration as
the plug illustrated in Fig. C. No adapter is available or
should be used with the 240 Volt plug.
IN ALL CASES, MAKE CERTAIN THE
RECEPTACLE IN QUESTION IS PROPERLY GROUNDED. IF
YOU ARE NOT SURE HAVE A QUALIFIED ELECTRICIAN
CHECK THE RECEPTACLE.
4. Permanently connected machines:
If the machine is intended to be permanently connected,
the machine should be connected to a grounded metal
permanent wiring system, or to a system having an
equipment-grounding conductor.
Fig. C
GROUNDED OUTLET BOX
CURRENT
CARRYING
PRONGS
GROUNDING BLADE
IS LONGEST OF THE 3 BLADES
EXTENSION CORDS
Use proper extension cords. Make sure your extension cord is in good condition and is a 3-wire
extension cord which has a 3-prong grounding type plug and matching receptacle which will accept the machine’s
plug. When using an extension cord, be sure to use one heavy enough to carry the current of the machine. An
undersized cord will cause a drop in line voltage, resulting in loss of power and overheating. Fig. D-1 or D-2, shows
the correct gauge to use depending on the cord length. If in doubt, use the next heavier gauge. The smaller the gauge
number, the heavier the cord.
Fig. D-1 Fig. D-2
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC MACHINES
Ampere Total Length Gauge of
Rating Volts of Cord in Feet Extension Cord
0-6 120 up to 25 18 AWG
0-6 120 25-50 16 AWG
0-6 120 50-100 16 AWG
0-6 120 100-150 14 AWG
6-10 120
up to 25 18 AWG
6-10 120 25-50 16 AWG
6-10 120 50-100 14 AWG
6-10 120 100-150 12 AWG
10-12 120
up to 25 16 AWG
10-12 120 25-50 16 AWG
10-12 120 50-100 14 AWG
10-12 120 100-150 12 AWG
12-16 120
up to 25 14 AWG
12-16 120 25-50 12 AWG
12-16 120 GREATER THAN 50 FEET NOT RECOMMENDED
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC MACHINES
Ampere Total Length Gauge of
Rating Volts of Cord in Feet Extension Cord
0-6 240 up to 50 18 AWG
0-6 240 50-100 16 AWG
0-6 240 100-200 16 AWG
0-6 240 200-300 14 AWG
6-10 240
up to 50 18 AWG
6-10 240 50-100 16 AWG
6-10 240 100-200 14 AWG
6-10 240 200-300 12 AWG
10-12 240
up to 50 16 AWG
10-12 240 50-100 16 AWG
10-12 240 100-200 14 AWG
10-12 240 200-300 12 AWG
12-16 240
up to 50 14 AWG
12-16 240 50-100 12 AWG
12-16 240
GREATER THAN 100 FEET NOT RECOMMENDED

8
FOREWORD
Delta Model 31-300 is an industrial/commercial duty 1-1/2 HP belt/disc sander. The induction-type, ball-bearing motor provides
long-lasting, smooth performance. The Sanding Center can provide 3000 SFPM with the belt, and the disc will revolve at 2100
RPM.
FUNCTIONAL DESCRIPTION
CARTON CONTENTS
1. Disc Sander Table
2. Belt Guard
3. #10-32 x 1/2" Machine Screws (4)
4. Belt Sander Table
5. Motor
6. Knob (2)
7. Clamp (2)
8. 7/16” Washer (2)
9. Spring (2)
10. Stud (2)
11. Handle (1)
12. 3/8” Washer (1)
13. Tension Spring (1)
14. 3/8” Hex Nut (1)
15. 3/8” Lock Nut (1)
16. Stud (1)
1
2
3
4
5
Fig. 2
Fig. 3
19
NOTICE: THE PHOTO ON THE MANUAL COVER ILLUSTRATES THE
CURRENT PRODUCTION MODEL. ALL OTHER ILLUSTRATIONS CONTAINED
IN THE MANUAL ARE REPRESENTATIVE ONLY AND MAY NOT DEPICT THE
ACTUAL COLOR, LABELING OR ACCESSORIES AND ARE INTENDED TO
ILLUSTRATE TECHNIQUE ONLY.
16. Lower Braces (Short) (2)
17. Top Shelf
18. Lower Braces (Long) (2)
19. Legs (4)
20. Sanding Disc
18
16
17
6711
10
8
9
13 14
12
16
15
20
Fig. 4

9
Fig. 5
UNPACKING AND CLEANING
Carefully unpack the machine and all loose items from the shipping container(s). Remove the protective coating from
all unpainted surfaces. This coating may be removed with a soft cloth moistened with kerosene (do not use acetone,
gasoline or lacquer thinner for this purpose). After cleaning, cover the unpainted surfaces with a good quality household
floor paste wax.
For assembling stand:
21. 5/16-18 x 5/8" Carriage Bolt (32)
22. 5/16" Lock Washer (32)
23. 5/16" Flat Washer (32)
24. 5/16"-18 Hex nut (32)
To attach center to stand
25. 5/16 x 1/2" Hex Head Bolt (4)
26. 5/16" Lock Washer (4)
27. #10-32 x 1/2" Machine screws (4)
28. #10 Flat Washers (4)
To attach motor to stand:
29. 1/2" Flat Washer (2)
30. 1/2" Locknut (2)
31. 1/2-13 x 3/4" Hex Head Bolt (2)
32. 5/16" Lock Washer (2)
33. 5/16" Flat Washer (2)
34. 5/16" Wing Nut (2)
35. 5/16-18 x 1" Carriage Head Bolt (2)
36. Pointer and #10-32 Round Head Screw
37. Sanding Center
21
22
23
24
25
26
29
30
31
32
33
34
35
28
27 37
ASSEMBLY
ASSEMBLY TOOLS REQUIRED
* Phillips Head Screwdriver (not supplied)
* 11/16”, 3/4”, and 1/2” Socket or Open End Wrenches (not supplied)
ASSEMBLY TIME ESTIMATE - 1-2 hrs.
FOR YOUR OWN SAFETY, DO NOT CONNECT THE MACHINE TO THE POWER SOURCE UNTIL
THE MACHINE IS COMPLETELY ASSEMBLED AND YOU READ AND UNDERSTAND THE ENTIRE
OWNER’S MANUAL.
ASSEMBLING STAND
1. Attach the two short lower braces (A) Fig. 6, and the other two
long lower braces (B) to the four legs (C), using the sixteen 5/8"
carriage bolts, flat washers, lockwashers, and hex nuts.
NOTE:Hand tighten the hex nuts for future adjustments.
2. Attach the top shelf (D) to the legs, using the remaining carriage
bolts, flat washers, lockwashers, and hex nuts. NOTE: Hand
tighten the hex nuts for future adjustments.
3. Make sure that the stand is on level ground. Use a helper to lift
and position the machine on the top shelf, and tighten all stand
hardware securely.
Fig. 6
A
A
B
B
C
C
C
D
C
36

10
ATTACHING MACHINE TO STAND
DISCONNECT MACHINE FROM POWER
SOURCE.
1. Pull the belt (A) Fig. 8 down through the smaller
rectangular hole (B) in the top shelf of the stand.
2. Fasten the machine to the top shelf with four 5/16" x
1/2" bolts and lockwashers (C) Fig. 8 (three of which
are shown) and four #10-32 self-tapping screws and
washers (D). (The motor was removed for easier
viewing here.)
10
ATTACHING MOTOR TO STAND
DISCONNECT MACHINE FROM POWER
SOURCE.
The motor comes with an attachment bracket installed.
1. Locate the welded bracket (A) Fig. 7 underneath the
top shelf of the stand.
2. Place the motor attachment bracket (B), so that the
holes in the attachment bracket align with the holes in
the welded bracket (A).
3. Insert the hex head bolts - one of which is shown at (C)
- and flat washers, in the holes from the inside out.
4. Using an 11/16" open end wrench, tighten the locknuts -
one of which is shown at (D) - on the hex head bolts.
Hold the hex head bolts with an 11/16" socket as you
tighten.
Fig. 8
A
B
C
D
INSTALLING DRIVE BELT AND BELT
GUARD
DISCONNECT MACHINE FROM POWER
SOURCE.
NOTE: MAKE SURE THE BELT IS ON THE SANDER
DRIVE PULLEY.
1. Slip belt (A) Fig. 8A, over motor pulley (B).
2. Allow motor to drop and pull belt tight.
3. Be sure the pulleys are aligned properly. To adjust,
loosen set screw (E) Fig. 8A with a 3/16 hex wrench and
move motor pulley to proper position. Once set, retighten
set screw.
4. Other adjustments are possible. Loosen screws (D)
and (C) Fig 8A and slide sanding unit right or left if needed.
Retighten all hardware before continuing.
5. Insert carriage bolts (C) Fig. 8A from inside out to
attach free end of motor to motor mounts.
6. Place washer and lockwasher on carriage bolts.
7. Thread wing nut (D) onto carriage bolts and tighten
securely.
8. Place belt guard (F) Fig. 8B over pulley and belt. Align
the holes in the guard (G) with the holes in the shelf (H).
Fasten the guard to the shelf with four #10-32 machine
screws.
A
B
C
DD
Fig. 7
Fig. 8A
Fig. 8B
E
B
A
C
D
F
H
G

11
A
B
C
Fig. 9 Fig. 10 Fig. 11
DISCONNECT MACHINE FROM POWER
SOURCE.
1. Thread the disc table trunnion stud (A) Fig. 12 into
the hole (B) on the side of the machine and tighten
snug.
2. Place the disc table trunnion clamp (C) on the stud
and insert the two pins (D) in the two holes (E).
3. Attach the washer, spring, and knob (Inset - Fig. 12)
4. Follow the same procedure for the other side.
5. Place the table in position. Confirm that the table
trunnion (A) Fig. 13A rests in the groove (B) of the
attaching clamps. Tighten the knob (C)
6. Remove the disc table trunnion knob (C) from the side
of the machine where there is a scale on the trunnion.
Attach the pointer (A) Fig. 13B to the hole (B) on
the disc table trunnion clamp.
7. Tighten the knob (C) Fig. 13A.
Fig. 12
AB
C
D
D
EE
Fig. 13A
AB
C
ATTACHING DISC TABLE
DISCONNECT MACHINE FROM POWER SOURCE.
1. Clean the sanding disc plate (A) Fig. 9 of any oil or grease, and be certain that it is dry.
2. Peel approximately 1/2 of the backing (B) Fig. 9 from the sanding disc (C).
3. Insert the sanding disc (C) Fig. 9 with the paper backing downward between the disc assembly and the disc guard.
4. Press the top half of the sanding disc firmly against the disc assembly (Fig. 10).
5. Manually rotate the disc assembly and remove the paper from the sanding disc (Fig. 11). Press the remaining half of the
sanding disc firmly against the disc assembly.
IMPORTANT: Securely position the sanding disc on the disc assembly prior to applying power to the tool.
ATTACHING SANDING DISC
Fig. 13B
A
B

Fig. 18
A
STARTING AND STOPPING THE MACHINE
The on-off switch (A) Fig. 16 is located on the sander base. To turn the sander “ON”, move the switch to the up position. To turn
the sander “OFF”, move the switch to the down position.
Fig. 16 Fig. 17
A
A
12
DISCONNECT MACHINE FROM POWER SOURCE.
1. Insert the trunnion key (A) Fig. 14 into the slot on the side of the sanding arm (B).
2. Thread the stud (C) into the hole (D) on the side of the sanding arm.
3. Attach the washer, nut, lever, spring, and locknut (Inset - Fig 15)
4. Tighten the lever (E) Fig.15.
Fig. 14
A
B
C
Fig. 15
D
ATTACHING BELT TABLE
E
OPERATION
OPERATIONAL CONTROLS AND ADJUSTMENTS

13
ADJUSTING TENSION AND
TRACKING OF THE BELT
The machine is shipped without belt
tension. Before operating the machine,
follow these instructions for adjusting the
belt for tension and tracking.
1. Loosen the two lock knobs (A) Fig. 19, and remove the
top cover (B).
2. Turn the belt tension lever (C) Fig. 20 counter-clockwise
to increase the belt tension. NOTE: The tension lever (C)
is spring-loaded and can be repositioned by pulling out
the handle, moving it, and letting it spring back into
position. Correct tension is determined by:
(A) flatness of the belt on the plate.
(B slippage of the belt when sanding heavy work.
3. Rotate the belt (D) Fig. 21 by hand, and tighten or loosen
the tracking knob (E) Figs. 20 and 21 until the belt is
tracking correctly.
4. Turn the tool on and off to check for proper tracking. If
the belt is leading to one side or the other, very gently
turn the tracking knob (E) Fig. 20 clockwise to move the
belt to the right or counterclockwise to move the belt to
the left.
5. A final adjustment can be made with the motor running.
THIS ADJUSTMENT SHOULD BE VERY SLIGHT.
6. Replace the top cover that was removed in STEP 1.Fig. 20
Fig. 21
IMPORTANT:
DISCONNECT MACHINE FROM POWER
SOURCE.
OVERLOAD PROTECTION
The motor supplied with your sander is equipped with a reset overload relay button (A) Fig. 18. If the motor shuts off or fails to
start because of overloading (sanding too heavy, using a worn sanding belt or disc, using the sander beyond its capacity), or
low voltage, turn the switch (A) Fig. 16 to the “OFF” position. Let the motor cool three to five minutes and push the reset button
(A) Fig. 18. Start the motor.
Fig. 19
LOCKING SWITCH IN THE “OFF” POSITION
When the tool is not in use, the switch should be locked in the “OFF” position to prevent unauthorized use,
using a padlock (A) Fig. 17 with a 3/16" diameter shackle.
IMPORTANT:
A
B
C
E
D
E

1414
After a long period of time, adjustments may be necessary to
maintain the tension and tracking of the sanding belt. If the
belt will not hold its tension, tighten the set screw (G) Fig. 22.
If the belt will not hold its tracking, tighten the set screw (F)
Fig. 22.
Make only small adjustments to these screws. Over-tightening
will lock the tension lever and/or the tracking knob.
NOTE:
1. Loosen the table tilting lock handle (A) Fig. 23, move the stop (B) into position, and rotate the table (C) Fig. 24 until the
trunnion (D) Fig. 23 contacts the stop (B). Tighten the lock handle (A). NOTE: The lock handle (A) is spring-loaded and can
be repositioned by pulling out the handle, moving it, and letting it spring back into position.
2. Place a square (E) Fig. 24 on the table against the belt. See if the table is 90 degrees to the belt.
3. To adjust, loosen the table tilting lock handle (A) Fig. 23. Turn the adjusting screw (F) in or out until table is 90 degrees to
the belt.
4. Tighten the lock handle (A) Fig. 23.
5. The adjusting screw (F) Fig. 23 ensures that the belt table can rapidly return to the 90 degree position after the table has
been tilted.
6. Adjust the pointer, if necessary.
ADJUSTING SANDING BELT TABLE 90 DEGREES TO BELT
DISCONNECT MACHINE FROM POWER SOURCE.
Fig. 22
Fig. 23 Fig. 24
TILTING THE BELT SANDER TABLE
DISCONNECT MACHINE FROM POWER SOURCE.
The table (A) can be tilted 45 degrees down (Fig. 25). To tilt the table, loosen the lock handle (B), tilt the table to the
desired angle, and tighten the lock handle (B). The degree of tilt is noted on the pointer and scale.
NOTE: When tilting the table down (Fig. 25), rotate the stop (E) Fig. 26 out of the way.
Fig. 25 Fig. 26
G
F
A
B
C
D
FE
A
B
C
D
E

15
CHANGING POSITION OF SANDING ARM
DISCONNECT MACHINE FROM POWER SOURCE.
1. The sanding arm (A) can be used in the vertical position (Fig. 31), the horizontal position (Fig. 30), or any angle in
between. Loosen the lock handle (B), position the arm (A) to the desired angle, and tighten the lock handle (B).
2. The top idler pulley cover (C) Figs. 30 and 31 can be removed to clear the workpiece when sanding in the
horizontal position. For a long workpiece, lower the deflector plate (D) to clear the workpiece. Raise the deflector
plate (D) to deflect saw dust when sanding a short workpiece.
NOTE: With the sanding arm (A) in the horizontal position (Fig. 31), use the table (E) or the accessory backstop to
support the work.
Fig. 27
Fig. 31
Fig. 30
1. Position the table (A) (Figs. 27 and 28) 90 degrees to the belt. Place a square (B) in the miter gauge slot with the
blade (C) of the square touching the sanding belt. Check the opposite end of the belt to see if the miter gauge slot
(D) is parallel to the belt.
2. To adjust, loosen the three (3) screws (E) Fig. 29, located underneath the table. Move the table (A) until the miter
gauge slot is parallel to the sanding belt. Tighten the three (3) screws (E).
NOTE: When making this adjustment, tighten the table lock handle.
IMPORTANT: Maintain a maximum distance of 1/16" between the sanding belt and the table.
DISCONNECT MACHINE FROM POWER SOURCE
ADJUSTING BELT SANDER TABLE MITER GAUGE SLOT
PARALLEL TO SANDING BELT
B
C
D
A
B
C
D
A
E
C
A
E
D
B
A
CE
B
Fig. 28 Fig. 29

1616
DISCONNECT MACHINE FROM POWER SOURCE
Fig. 33
Fig. 32
ADJUSTING SANDING DISC TABLE 90 DEGREES TO DISC
TILTING THE DISC SANDER TABLE
DISCONNECT MACHINE FROM POWER
SOURCE.
The table (A) can be tilted 45 degrees down (Fig. 34), by
loosening the lock handle (B), tilting the table (A), and
tightening lock handle (B). The degree of tilt is determined by
the scale and pointer.
Fig. 34
1. Loosen the disc table lock handle (A) Fig. 32, and move the table (B) Fig. 33 until the it contacts the stop. Tighten
the lock handle (A) Fig. 32.
2. Place a square (E) Fig. 33 on the table and against the sanding disc. See if the table is 90 degrees to the disc.
3. To adjust, loosen the lock handle (A) Fig. 32, and tighten or loosen the screw (F) Fig. 32 until the table is 90 degrees
to the disc.
4. The stop (F) Fig. 32 ensures that the table can rapidly return 90 degrees to the disc after the table has been
tilted.
5. Adjust pointer, if necessary.
ADJUSTING DISC TABLE MITER GAUGE SLOT PARALLEL TO SANDING DISC
DISCONNECT MACHINE FROM POWER
SOURCE
1. With the table (A) Fig. 35 positioned 90 degrees to the
disc, place a square (B) in the miter gauge slot with the
blade of the square touching the sanding disc.
2. Use a pencil to mark the disc where the blade contacts it.
(Fig. 35).
3. Rotate the disc to the other end of the table. Use a square
to check the distance between the miter gauge slot and
the mark on the disc made in STEP 3.
Fig. 35
ABE
F
A
B
A
B

17
REPLACING SANDING BELT
To replace the sanding belt:
1. Loosen the two lock knobs (A) Fig. 38, and remove the top cover (B).
2. Loosen the two screws (C) Fig. 39 enough to allow the back panel (D) Fig. 38 to hinge open. NOTE: The screw (C)
cannot be removed.
3. Release the belt tension by turning the hand lever (E) Fig. 38. Slide the belt (F) Fig. 40 off of both sanding drums.
4. Slide the new sanding belt over both sanding drums. Ensure that the belt runs in the direction of the arrow, printed
on the inside of the belt.
5. Apply tension to the sanding belt and replace the top cover removed in STEP 2.
6. Tighten the two screws loosened in STEP 3.
7. Connect the power source to the sander and check for proper belt tracking.
Fig. 38 Fig. 39
REPLACING SANDING DISC
See “ATTACHING SANDING DISC” section in this manual.
DISCONNECT MACHINE FROM POWER SOURCE
DISCONNECT MACHINE FROM POWER SOURCE.
POWER TAKE-OFF SHAFT
1. A power take-off shaft (A) Fig. 37 is provided on the lower end of the sanding belt arm to accommodate
accessories.
2. For access to the power take-off shaft, remove the two screws (B) Fig. 37, and cover (C).
Fig. 37
DISCONNECT MACHINE FROM POWER SOURCE
Unguarded rotating shafts (A) Fig 37 can create an entanglement hazard. ALWAYS COVER THE
POWER TAKE-OFF SHAFT when not using accessories.
4. To adjust, loosen the four screws, two of which are shown at (D) Fig. 36. Adjust the table until the miter gauge slot
is parallel to the disc. Tighten the four screws (D).
NOTE: When making this adjustment, tighten the lock handle (A) Fig. 36.
IMPORTANT: Maintain a maximum distance of 1/16" between the sanding disc and the table.
Fig. 36
Fig. 40
D
A
A
B
C
A
B
E
CF
D

18
Fig. 45
Fig. 44
SURFACING OR EDGE SANDING WITH SANDING BELT
When surfacing (Fig. 44) or edge sanding (Fig. 45), place the sanding arm in the horizontal position and use the table
(A) Fig. 44 and Fig. 45 to keep the workpiece in place. Hold the workpiece firmly and keep your fingers away from the
sanding belt. Place the end of the workpiece against the table and move the workpiece evenly across the sanding belt.
Apply only enough pressure to allow the sanding belt to remove material. Use extra caution when sanding very thin
pieces.
POSITION THE EDGE OF THE TABLE (A) FIG. 44 A MAXIMUM OF 1/16" AWAY FROM THE
SANDING BELT (B) TO AVOID TRAPPING THE WORKPIECE OR YOUR FINGERS BETWEEN THE
TABLE AND THE SANDING BELT.
Fig. 46
SANDING INSIDE CURVES
You can sand inside curves on the top sanding drum
(Fig. 46) if you loosen the knobs (A) Fig. 46 inset and
remove the guard
REPLACE THE SANDING DRUM
GUARD AFTER THE SANDING
OPERATION IS COMPLETED.
Fig. 47
SANDING OUTSIDE CURVES
Sand outside curves on the sanding disc as illustrated in
Fig. 47.
ALWAYS SAND ON THE LEFT SIDE
(DOWNWARD ROTATION SIDE) OF
THE SANDING DISC. SANDING ON
THE RIGHT SIDE (UPWARD
ROTATION SIDE) OF THE SANDING
DISC COULD CAUSE THE
WORKPIECE TO FLY UP, WHICH
COULD BE HAZARDOUS.
THE EDGE OF THE TABLE (A) FIG. 47
MUST BE POSITIONED A MAXIMUM
OF 1/16" AWAY FROM THE SANDING
DISC (B) TO AVOID TRAPPING THE
WORKPIECE OR FINGERS BETWEEN
THE TABLE AND SANDING DISC.
A
A
MACHINE USE
B
A
B
A

19
Fig. 48
END SANDING WITH THE DISC
When sanding the ends of narrow workpieces, use the sanding disc and an accessory miter gauge (A) Fig. 48. Move
the work from the center to the left side (downward) of the sanding disc.
ALWAYS SAND ON THE LEFT SIDE (DOWNWARD ROTATION SIDE) OF THE SANDING DISC.
SANDING ON THE RIGHT SIDE (UPWARD ROTATION SIDE) OF THE SANDING DISC COULD
CAUSE THE WORKPIECE TO FLY UP, WHICH COULD BE HAZARDOUS.
THE EDGE OF THE TABLE (C) FIG. 48 MUST BE POSITIONED A MAXIMUM OF 1/16" AWAY
FROM THE SANDING DISC (B) TO AVOID TRAPPING THE WORK OR FINGERS BETWEEN THE
TABLE AND THE SANDING DISC.
Fig. 49
END SANDING WIDE WORKPIECES WITH THE BELT
When sanding the ends of wide workpieces, use the sanding arm in the vertical position (Fig. 49).
For more accurate work use an accessory miter gauge and move the work evenly across the sanding belt (Fig. 49).
AC
B

2020
TROUBLESHOOTING
For assistance with your machine, visit our website at www.deltamachinery.com for a list of service centers or call
the DELTA Machinery help line at 1-800-223-7278 (In Canada call 1-800-463-3582).
MAINTENANCE
PARTS, SERVICE OR WARRANTY ASSISTANCE
All Delta Machines and accessories are manufactured to high quality standards and are serviced by a network
of Porter-Cable • Delta Factory Service Centers and Delta Authorized Service Stations. To obtain additional
information regarding your Delta quality product or to obtain parts, service, warranty assistance, or the location
of the nearest service outlet, please call 1-800-223-7278 (In Canada call 1-800-463-3582).
KEEP MACHINE CLEAN
Periodically blow out all air passages with dry compressed
air. All plastic parts should be cleaned with a soft damp
cloth. NEVER use solvents to clean plastic parts. They could
possibly dissolve or otherwise damage the material.
Wear ANSI Z87.1 safety glasses while
using compressed air.
FAILURE TO START
Should your machine 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.
LUBRICATION
Apply household floor paste wax to the machine table and
extension table or other work surface weekly.
PROTECTING CAST IRON FROM RUST
To clean and protect cast iron tables from rust, you will
need the following materials: 1 pushblock from a jointer,
1 sheet of medium Scotch-Brite™ Blending Hand Pad, 1
can of WD-40®, 1 can of degreaser, 1 can of TopCote®
Aerosol. Apply the WD-40 and polish the table surface
with the Scotch-Brite pad using the pushblock as a
holddown. Degrease the table, then apply the TopCote®
accordingly.
SERVICE