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Drill Master 3670 - User Manual

Drill Master 3670
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3/8” VARIABLE SPEED
REVERSIBLE DRILL
Model
3670
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.
Copyright
©
2003 by Harbor Freight Tools
®
. All rights reserved. No portion of this manual or any artwork
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.
Manual revised 10g

Questions and Answers

  • A
    Andrew JamesJul 30, 2025
    Why my Drill Master 3670 will not start?
    • S
      stephanie84Jul 30, 2025
      If your Drill Master Drill won't start, there are several potential causes. First, ensure the cord is securely plugged in. Second, check if the outlet has power. If not, turn off the drill and check the circuit breaker. If the breaker is tripped, verify the circuit's capacity and ensure no other loads are present. Finally, internal damage or wear could be the issue, in which case you should have a qualified technician service the drill.
  • B
    Billy BlackburnAug 5, 2025
    Why is my Drill Master Drill overheating?
    • U
      uadamsAug 5, 2025
      If your Drill Master Drill is overheating, consider these possible causes: * You might be forcing the tool to work too fast. Allow it to work at its own pace. * The accessory could be misaligned. Check and correct the alignment of the accessory to the fence and/or table. * A dull or damaged accessory may be the cause. Keep cutting accessories sharp and replace them as needed. * The motor housing vents might be blocked. Wear safety goggles and a dust mask/respirator while using compressed air to blow dust out of the motor. * The motor could be strained by a long or small diameter extension cord. Eliminate the use of an extension cord or use one with the proper diameter for its length and load.
  • C
    Cassandra ReidAug 11, 2025
    How to fix a Drill Master Drill that operates slowly?
    • J
      Jasmine PalmerAug 11, 2025
      If your Drill Master Drill is operating slowly, it could be due to a couple of reasons. One possibility is that the extension cord is too long or the wire size is too small. Try eliminating the extension cord, or if you need one, use a shorter, heavier gauge cord. Another reason could be that you're applying too much pressure. Lessen the amount of pressure on the tool by turning the torque setting to its minimum.
  • S
    Samuel FranklinAug 16, 2025
    What to do if the performance of my Drill Master Drill decreases over time?
    • S
      Stephanie LoganAug 16, 2025
      If the performance of your Drill Master Drill decreases over time, it could be due to a dull or damaged accessory. Keep cutting accessories sharp and replace them when necessary. Alternatively, the carbon brushes may be worn or damaged, in which case you should have a qualified technician replace them.
  • H
    hughesmichelleAug 23, 2025
    Why is my Drill Master Drill making excessive noise?
    • D
      Dr. Jason Phelps DVMAug 23, 2025
      If your Drill Master Drill is making excessive noise or rattling, it is likely due to internal damage or wear. In this case, have a technician service the tool.

Summary

Important Safety Information

General Power Tool Safety Warnings

Covers essential safety practices for power tool use, including work area, electrical, and personal safety.

Personal Safety Precautions

Details on staying alert, using PPE, and preventing unintentional starting or accidents.

Drill Specific Safety Warnings

Drill Safety Warnings

Specific safety advice for drill operation, including handling, labeling, and pacemaker considerations.

Grounding and Electrical Safety

Specifications and Operation

General Operating Instructions

Steps for plugging in, setting rotation direction, speed control, and locking the trigger.

Maintenance and Troubleshooting

Troubleshooting Common Problems

Solutions for common issues like the tool not starting, slow operation, or overheating.

Drill Master 3670 Specifications

General IconGeneral
BrandDrill Master
Model3670
CategoryDrill
LanguageEnglish

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