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Fig. A
FUNCTIONAL DESCRIPTION
FOREWORD
Delta Model 31-390 is a large capacity Edge Sander for fast, efficient, straight and bevel edge sanding with the added
ability to handle contour sanding jobs. The standard unit includes; motor, stand legs, push-button controls, magnetic
starter, transformer, overload protection, laminate coated tables, graphite platens, three sanding drums with 80 grit
medium abrasive sleeves and 6" x 132" belt, sealed ball bearing idler pulley, rubber contact motor pulley, belt guard with
hinged end caps and instruction manual.
5
GROUNDED OUTLET BOX
CURRENT
CARRYING
PRONGS
GROUNDING BLADE
IS LONGEST OF THE 3 BLADES
31-390 ONLY:
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 tool’s plug. When using
an extension cord, be sure to use one heavy enough to
carry the current of the tool. An undersized cord will
cause a drop in line voltage, resulting in loss of power
and overheating. Fig. C, 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.
EXTENSION CORDS
Fig. C
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC TOOLS
Ampere Total Length Gauge of
Rating Volts of Cord in Feet Extension Cord
0-6 230
up to
50 18 AWG
0-6 230 50-100 16 AWG
0-6 230 100-200 16 AWG
0-6 230 200-300 14 AWG
6-10 230
up to
50 18 AWG
6-10 230 50-100 16 AWG
6-10 230 100-200 14 AWG
6-10 230 200-300 12 AWG
10-12 230
up to
50 16 AWG
10-12 230 50-100 16 AWG
10-12 230 100-200 14 AWG
10-12 230 200-300 12 AWG
12-16 230
up to
50 14 AWG
12-16 230 50-100 12 AWG
12-16 230
GREATER THAN 100 FEET NOT RECOMMENDED
Fig. B
UNPACKING AND CLEANING
Carefully unpack the tool, two legs 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.
Fig. 2, illustrates the basic sander (A) removed from the
shipping container. Place the sander (A) on a supporting
surface that will hold 375 lbs., such as two saw horses,
which will allow safe and efficient assembly of the legs.
Fig. 2
A
CONNECT
THREE POWER
LEADS TO
TERMINALS
L1 - L2 - L3
AND GREEN
LEAD TO THE
GROUND
STRIP
GROUND
STRIP
BRING POWER
LEAD THRU
ENTRANCE
HOLE IN
BOTTOM OF
STARTER
ENCLOSURE