GOYOJO GMS8 Digital Torque Screwdriver Instruction Manual

1. Introduction

The GOYOJO GMS8 Digital Torque Screwdriver is a manual force-applied precision tool designed for accurate measurement and control of tightening torque during screw fastening. It is not an electric screwdriver and requires manual force application. The digital screen displays real-time torque values, ensuring precise application and preventing over-tightening or under-tightening. This tool is ideal for precision assembly, electronics repair, bicycle adjustment, optics mounting, and other tasks requiring controlled torque.

Image: GOYOJO GMS8 Digital Torque Screwdriver displaying a torque value of 6.4 Nm during use on a bicycle component.

2. Included Components

The GOYOJO GMS8 Digital Torque Screwdriver set includes the following items:

• 1 x Digital Torque Screwdriver (7.08-70.8 in-lbs / 0.8-8 N·m)
• 10 x Screwdriver Bits
• 1 x Product Manual
• 1 x Storage Case
• 2 x AAA Batteries

Image: The complete GOYOJO GMS8 Digital Torque Screwdriver kit, including the screwdriver, various bits, and storage case.

3. Product Features

• High-Accuracy Digital Torque: Torque range of 7.08–70.8 in-lbs (0.8–8 N·m) with ±2% accuracy.
• Multiple Units: Supports 4 torque units: in-lb, ft-lb, N·m, and kg-cm.
• Real-Time Digital Display: Manual force application with real-time torque value display.
• Working Modes: Track, Peak Hold, and Preset modes for versatile use.
• Backlit Screen: Ensures clear readability in various lighting conditions.
• Buzzer and Visual Alerts: Provides audible and visual alerts when nearing or reaching the preset torque value to prevent over-tightening.
• Data Storage: Stores up to 999 groups of torque data for tracking and comparison.
• Magnetic Bit Holder: 1/4" magnetic bit holder for quick bit changes.
• Ergonomic Design: Comfortable handle for improved control during use.

4. Setup Guide

4.1 Battery Installation

The GOYOJO GMS8 Digital Torque Screwdriver requires 2 AAA batteries (included). To install:

1. Twist off the cap at the bottom of the screwdriver handle.
2. Insert the 2 AAA batteries according to the polarity markings.
3. Replace and tighten the cap securely.

4.2 Bit Installation

To install a screwdriver bit:

1. Pull up the collar on the 1/4" magnetic bit holder at the tip of the screwdriver.
2. Insert the desired bit into the holder.
3. Release the collar to secure the bit. Ensure the bit is firmly seated.

Image: The screwdriver displaying its control buttons and the 1/4" bit holder.

5. Operating Instructions

5.1 Power On/Off

To power on the device, press the 'C' button. The screen will beep and display the interface. To power off, press and hold the 'C' button.

5.2 Mode Selection

The screwdriver offers three working modes: Track, Peak Hold, and Preset. Use the 'M' button to cycle through these modes:

• Track Mode: Displays real-time torque value as force is applied. Resets to zero when released.
• Peak Hold Mode: Captures and holds the highest torque value achieved during tightening.
• Preset Mode: Allows setting a target torque value. The device will alert you when this value is approached or reached.

Image: The screwdriver's display illustrating the Peak and Track modes with their respective functions.

5.3 Torque Unit Selection

Press the 'U' button to switch between the four available torque units: N·m, lbf·ft, lbf·in, and kgf·cm.

Image: The screwdriver's display cycling through the four available torque units: in-lb, ft-lb, kgf-cm, and N·m.

5.4 Setting Target Torque (Preset Mode)

In Preset Mode, use the Up (▲) and Down (▼) arrow buttons to adjust the desired target torque value. The display will show the set value.

5.5 Using the Screwdriver

Apply manual force to tighten the screw. The screen will display the real-time torque. In Preset Mode, the device will provide alerts as you approach and reach the target torque.

Image: A collage demonstrating the GOYOJO GMS8 Digital Torque Screwdriver being used in automotive, bicycle, electronics, and woodworking applications.

5.6 Torque Alerts

When approaching the preset torque value, the screwdriver provides both a buzzer and visual alerts (LED lights on the sides of the display) to indicate the tightening status. This helps prevent over-tightening or under-tightening.

Image: The screwdriver in use, with red LED lights indicating that the target torque is being approached or has been reached.

6. Maintenance

• Keep the screwdriver clean and dry. Wipe with a soft, damp cloth.
• Store the device and its accessories in the provided case when not in use to protect it from dust and damage.
• Remove batteries if the device will not be used for an extended period to prevent leakage.
• Avoid exposing the device to extreme temperatures or direct sunlight.

7. Troubleshooting

• Device does not power on: Check battery orientation and ensure batteries are not depleted. Replace if necessary.
• Inaccurate readings: Ensure the bit is correctly seated. The device supports calibration-related applications; refer to the calibration certificate for details.
• No alerts in Preset Mode: Verify that a target torque value has been set and the device is in Preset Mode.

8. Technical Specifications

9. Warranty and Support

GOYOJO stands behind the quality of its products. The GMS8 Digital Torque Screwdriver comes with a 3-year replacement warranty for added peace of mind.

For technical support, warranty claims, or any inquiries regarding your product, please refer to the contact information provided in your product packaging or visit the official GOYOJO website.