Central Machinery 3914 Set Up And Operating Instructions Manual

Single needle industrial sewing machine

Hide thumbs

Table of Contents

Quick Links

Download this manual

Single needle induStrial

Set up and Operating inStructiOnS

Visit our website at: http://www.harborfreight.com

read this material before using this product.

Failure to do so can result in serious injury.

SaVe thiS Manual.

2005 by Harbor Freight Tools

contained herein may be reproduced in any shape or form without the express written consent of

Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly from the product described herein. Tools required for

assembly and service may not be included.

For technical questions or replacement parts, please call 1-800-444-3353.

reV 07f, 10b

Sewing Machine

Model

3914

Table of Contents

Summary of Contents for Central Machinery 3914

Page 1: Sewing Machine
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.
Page 2: Specifications
Machine Type Heavy duty, industrial sewing machine; high speed, single needle-lock stitch Drive V-belt driven (size 41 replacement belt) Action Foot pedal operation, along with a knee and manual lifting arm for presser foot. Feed Type Link style needle feed...
Page 3 Only use accessories intended for use with this tool. Approved accessories are available from Harbor Freight Tools. do not operate tool if under the influence of alcohol or drugs. Read warning labels if taking prescription...
Page 4 3 prong grounded electrical plug provided with the machine must only be performed by a licensed electrician. This machine must be properly grounded. This sewing machine is only to be used for the purpose intended. reV 07a, 10b SKU 3914...
Page 5 (See 3-prong plug and Outlet.) reV 10b SKU 3914 For technical questions, please call 1-800-444-3353. The grounding prong in the plug is connected through the green wire inside the cord to the grounding system in the tool.
Page 6 Tools at the number on the cover of this manual as soon as possible. Symbology Double Insulated Canadian Standards Association Underwriters Laboratories, Inc. Volts Alternating Current Amperes No Load Revolutions per Minute (RPM) unpacKing When unpacking, check to make sure reV 10b SKU 3914...
Page 7 (25g) in each Pad or Cushion. note: The Rubber Pads (23g) are optional. They may be omitted, or used under the Rubber Cushions (24g) to adjust the tilt reV 07f, 10b SKU 3914 For technical questions, please call 1-800-444-3353. power Switch Figure 3...
Page 8 Do not use this setting to reverse the direction of the machine. Use the Reverse Control Lever (22e) to reverse the stitch feed direction when sewing. reV 03d, 03e, 07g, 10b Receptacle for 6 volt work light (not included) SKU 3914...
Page 9 Carriage Bolts (70j) into the top of the Tabletop so that they are flush with the tabletop. reV 04c; 07g, 10b SKU 3914 For technical questions, please call 1-800-444-3353. Carriage Bolts (70j), Flat Washer (69j), Belt (71j)
Page 10: Adjusting The Belt Tension
Page 10 For technical questions, please call 1-800-444-3353. caution: Do not tighten the Belt so much that the left side of the Sewing Machine begins to lift up from the Oil Pan. Once the Belt is the proper tension, tighten both Nuts against the Motor Housing Flange to hold the motor in place.
Page 11 (see above). Place another Washer (37i) over the end of the Rod, and thread on and tighten a Nut (38i). reV 04c, 05d, 10b SKU 3914 For technical questions, please call 1-800-444-3353. Upper Spool Rest Rod (30i)
Page 12 Mark where to drill holes. Remove the Rear Belt Cover and drill pilot holes. Secure the Rear Belt Cover in place using Wood Screws (9h). OperatiOn sewing machine, and avoid possible damage to the machine, sew at reV 07a, 10b SKU 3914...
Page 13: Bobbin Winder Operation
Loosen the Bolt (25c) and hold Needle (23c) with its indented part facing to the reV 07a, 10b SKU 3914 For technical questions, please call 1-800-444-3353. right. Insert the Needle and push it up until it will go no farther.
Page 14 Holding the Bobbin Case by the hinged latch, insert the Bobbin Case into the Rotating Hook (20c) from the underside of the machine. Release the hinged latch as the Bobbin Case slides into place. Bobbin (22c) Rotating Hook (20c) reV 07a, 10b SKU 3914...
Page 15: Threading The Top Thread
Needle (23c) wire guide Presser Foot (9d) Figure 25 reV 10b SKU 3914 For technical questions, please call 1-800-444-3353. threading the top thread Pass the thread between the two Thread Tension Discs (27a) on the top of the machine. Pass the thread up through the right...
Page 16: Adjusting The Stitch Length
(to a height of up to 1/2”), as long as it is pushed, while the Presser Foot stays in the raised or lowered position when using the Presser Foot Lever. Decrease Tension Bobbin Case (21c) reV 10b SKU 3914...
Page 17: Advanced Settings
Presser Foot pressure. After adjustment, tighten the Presser Spring Regulator Nut. reV 10b SKU 3914 For technical questions, please call 1-800-444-3353. The Sewing Machine is set at the factory for using with jean weight materials. The following adjustments are needed only when using the machine for unusual types of fabric or when changing machine components.
Page 18 Securely tighten the Set Screws on the Rotating Hook. If the clearance is too small, the tip of the Hook Blade Point will be abraded. If it is too large, it will lead to skipped stitches. reV 10b SKU 3914...
Page 19: Adjusting The Presser Bar Height
When sewing lightweight materials, move the Thread Guide (35a) to the right to decrease the length of thread reV 10b SKU 3914 For technical questions, please call 1-800-444-3353. pulled out by the Thread Take-up Spring. The normal setting is when the marker on the Thread Guide is aligned with the center of the Bolt.
Page 20 Check the Belt (71j) tension after first use and then weekly, and adjust as described in adjusting the Belt tension under the assembly instructions. When not in use, cover the machine and store in a clean and dry location. reV 10b SKU 3914...
Page 21 MOtOr wiring diagraM reV 07g, 10b SKU 3914 For technical questions, please call 1-800-444-3353. Page 21...
Page 22 Bed Screw Stud Rubber Plug Thread Take-up Lever Link Pin Hole Rubber Plug Brand Plate Brand Plate Rivet Main Shaft Bushing Connecting Rod Screw Motor (Not Shown) Servo motor (Slower replacement for stock motor, not shown, optional) SKU 3914 reV 07a, 10b...
Page 23 Bed aSSeMBly drawing Motor (DOL 12-Ha) (Not Shown) SKU 3914 For technical questions, please call 1-800-444-3353. Page 23...
Page 24 Needle Bar Crank Connecting Rod Sub-assembly Needle Bearing Needle Bar Crank Wearing Plate Crank Oil Adjusting Sub-assembly Crank Oil Adjusting Sub-assembly Rubber Bushing O-Ring Main Shaft Felt Main Shaft Front Bushing Sub-assembly Main Shaft Bolt Bolt SKU 3914 reV 10b...
Page 25 10b B - Main ShaFt aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 25...
Page 26 Needle Bar Thread Guide Bolt Wire Needle Bar Thread Guide Needle Bar Lower Bushing Bolt Needle Bar Connecting Pin Needle Bar Guide Block Needle Bar Needle Bar Upper Bushing Rubber Plug Bevel Gear Bevel Pinion Upright Shaft Upper Bushing reV 10b SKU 3914...
Page 27 - Stitch driVe aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 27...
Page 28 Tension Release Lever Lifting Lever Presser Rod Lifting Lever Rear Crank Lifting Lever Presser Rod Pressure Lever O-Ring Presser Spring Lifting Lever Shaft Hinge Bolt Spring Hinge Bolt Thread Release Finger Presser Bar Set Screw Bolt reV 10b SKU 3914...
Page 29 - preSSer Bar aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 29...
Page 30 Lock Pin Spring Lock Pin Stitch Length Dial Bolt Bolt Set Screw Feed Reverse Shaft O-Ring Feed Reverse Spring Bushing Bolt Bushing Connecting Rod Pin Snap Ring Bolt Rocker Slate Pin Set Screw Bolt Feed Holder Shaft reV 10b SKU 3914...
Page 31 - Feed cOntrOl aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 31...
Page 32 For technical questions, please call 1-800-444-3353. part description Bolt Bolt Oil Pump Throughway Rubber Joint Oil Pump Brace Bolt Gasket Oil Tube Bolt Spring Oil Return Tube Holder Oil Return Tube Plate Oil Return Tube Holder Bolt Oil Return Clamp O-Ring reV 10b SKU 3914...
Page 33 F - luBricatiOn aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 33...
Page 34 For technical questions, please call 1-800-444-3353. part description Bolt Knee Press Lifter Crank Knee Press Plate Rod Knee Press Plate Cover Joint Knee Press Plate Bolt Knee Lifter Tube Holder Knee Lifter Oil Pan Magnet Rubber Pad Rubber Cushion Tack reV 10b SKU 3914...
Page 35 When ordering parts for this component use the suffix “h”. note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. reV 10b SKU 3914 For technical questions, please call 1-800-444-3353. part description...
Page 36 Thread Hanger Column Cap Upper Spool Rest Rod Bolt Washer Column Pipe Connector Bolt Lower Spool Rest Rod Washer Spool Vibration Stopper Spool Pin Spool Rest Spool Mat Thread Guide Hole Thread Guide Hole Spool Support reV 10b SKU 3914...
Page 37 - BOBBin winder & thread Stand unit aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 37...
Page 38 ON/OFF Control Box Thrust Spring Ring Cushion Plate Bolt M6 x 20 (not shown) Nut M8 Spring Washer Ø8 Flat Washer Ø8 Carriage Bolt Belt (size 41) (not shown) Wood Screw (not shown) Flat Washer (not shown) description reV 10b SKU 3914...
Page 39 J - MOtOr aSSeMBly drawing SKU 3914 For technical questions, please call 1-800-444-3353. Page 39...
Page 40 Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that this product is free from defects in materials and workmanship for the period of 90 days from the date of purchase. This...