Delta 6″ Edge Sander 31-390,31-391,31-392 Owners Instruction Service & Parts Manual

Description

Number of Pages: 24

A dependable shop reference for anyone who owns or works on a Delta 6″ Edge Sander. This manual covers Delta models 31-390, 31-391, and 31-392. This quality reproduction combines the original factory instructions with two parts sections in one convenient book. The pages have been carefully cleaned and prepared for easy use at the workbench.

What’s in this manual:

• Auxiliary Abrasive Drum & Spindle Assembly — Standard equipment on this machine, with assembly instructions for finish-sanding small contoured workpieces, including mounting the drum assembly to the drive pulley. Three drum sizes (1-1/2″, 2″, and 3″) are covered.
• Auxiliary End Table — Assembly and positioning of the auxiliary end table, supplied as standard equipment. Adjusts vertically and horizontally to support contour sanding around the drive pulley and auxiliary abrasive drum spindles.
• Single-Phase & Three-Phase Installation — Model 31-390 is the single-phase machine and 31-391 is three-phase; the manual covers installation for each, including bringing three-phase power into the starter box and checking belt rotation direction.
• Changing Sanding Belts, Abrasive Sleeves, Graphite Pads & Drum Spindles — Four separate maintenance procedures: releasing belt tension to change the belt, loosening the spindle nut to replace abrasive sleeves, replacing the stapled graphite pads, and exchanging drum spindles at the adapter plate, with illustrations for each procedure.
• Adjusting Belt Tracking & Pulley Alignment — Checking belt tracking by jogging the machine and correcting it with the tracking knob, plus truing the motor pulley when the belt runs high or low.
• Adjusting Long & Short Platen, Tilting Table — Setting the long platen for the straight table, adjusting the short platen for the tilting table, and setting the table angle for bevel edge sanding. Includes adjusting table position and straight-table height.
• Original Catalog Spec Sheet — A bound-in catalog specification sheet covering belt size, platen dimensions, table dimensions, pulley diameters, dust collection spouts, and overall machine dimensions. Also lists catalog numbers for replacement belts and sanding sleeves.
• Two Parts Lists for Different Production Runs — Separate AFM-13-1 and AFM-13 (dated 10-22-30) parts breakdowns, including printed serial-number applicability to help match parts to the machine’s production run. The parts diagrams explicitly cover Delta models 31-390 and 31-391.

Contents:

GENERAL SAFETY RULES...................................................2
MANUAL BEFORE OPERATING THE TOOL.......................................2
TURN POWER OFF.........................................................2
MEDICATION.............................................................2
ADDITIONAL SAFETY RULES FOR ABRASIVE FINISHING MACHINES................3
AND AFTER SANDING METAL................................................3
  POWER CONNECTIONS....................................................4
MOTOR SPECIFICATIONS...................................................4
  GROUNDING INSTRUCTIONS...............................................4
GROUNDED...............................................................4
SINGLE PHASE INSTALLATION 31-390.......................................4
THREE PHASE INSTALLATION 31-391........................................4
PERMANENTLY CONNECTED TOOLS:...........................................4
ELECTRIC SHOCK.........................................................4
EXTENSION CORDS........................................................5
FUNCTIONAL DESCRIPTION.................................................5
FOREWORD...............................................................5
UNPACKING AND CLEANING.................................................5
ASSEMBLY...............................................................6
  ASSEMBLING LEGS TO EDGE SANDER.......................................6
  ASSEMBLING STARTER BOX TO CABINET (MAGNETIC CONTROL MODELS
    ONLY)..............................................................6
  ASSEMBLING BELT TENSION LEVER........................................7
  ASSEMBLING TOP GUARD AND DUST CHUTE ASSEMBLY.........................7
ASSEMBLING AUXILIARY ABRASIVE DRUM AND SPINDLE ASSEMBLY TO DRIVE
  PULLEY...............................................................8
ASSEMBLING AUXILIARY END TABLE.........................................9
OPERATING CONTROLS AND ADJUSTMENTS....................................10
NOT IN CONTACT WITH THE TABLE.........................................10
STARTING AND STOPPING EDGE............................................10
ADJUSTING TABLE POSITION..............................................10
  ADJUSTING TILTING TABLE.............................................10
ADJUSTING SHORT PLATEN................................................10
ADJUSTING LONG PLATEN.................................................11
ADJUSTING AUXILIARY END TABLE.........................................11
  ADJUSTING BELT TRACKING.............................................12
  ADJUSTING PULLEY ALIGNMENT..........................................12
  EDGE SANDING........................................................13
CONTOUR SANDING AROUND THE DRIVE PULLEY...............................13
CONTOUR SANDING AROUND THE AUXILIARY ABRASIVE DRUM SPINDLE............13
  CHANGING SANDING BELTS..............................................14
CHANGING ABRASIVE SLEEVES.............................................14
CHANGING GRAPHITE PADS................................................14
ACCESSORIES...........................................................15
PARTS, SERVICE OR WARRANTY ASSISTANCE.................................15
CHANGING DRUM SPINDLES................................................15
EXPLODED VIEW & REPLACEMENT PARTS - SECTION 1......................16-19
EXPLODED VIEW & REPLACEMENT PARTS - SECTION 2......................20-23
CATALOG SPECIFICATION SHEET...........................................24

Overview:

A clean manual is essential for dialing in your machine, but hard to find. Unlike low-resolution free PDF downloads, we professionally digitally restore every page—erasing stains, hole punches, tears, and handwriting. While constrained by the factory original, we maximize clarity so our manuals often look better than new. Printed on quality white paper and comb-bound to lay completely flat at the machine, we deliver a durable, vital tool backed by 30 years of shop expertise.