1. Product Overview
The Intermatic WG1573-10D time clock motor is a robust replacement component designed for various Intermatic time switches. It features high torque and fixed tab connectors for straightforward installation. This motor is specifically intended for use with Intermatic T102, T104, and WH40 time switches, operating at 208/277 Volts and 60Hz.
Key Features:
- Genuine Intermatic replacement motor
- Sturdy motor with high torque
- Fixed tab connectors for easy installation
- Compatible with T102, T104, and WH40 series
- Operates at 208/277 Volts and 60Hz

Figure 1: Intermatic WG1573-10D 60-Hertz Replacement Clock Motor. This image shows the compact motor unit with its two white electrical leads terminating in brass spade connectors. The motor casing is gray with model number WG1573-5 and voltage/frequency specifications (208/277V, 60Hz) printed on it.
2. Important Safety Instructions
WARNING: Risk of Electric Shock or Fire.
- Always disconnect power at the circuit breaker or fuse box before installing, servicing, or removing the motor. Failure to do so can result in serious injury or death.
- Installation and servicing should only be performed by qualified personnel in accordance with all local and national electrical codes.
- Ensure all connections are secure and properly insulated.
- Do not operate the timer with damaged components. Replace any worn or broken parts immediately.
3. Installation Guide
3.1 Accessing the Timer Mechanism
- Disconnect Power: Turn off the circuit breaker supplying power to the timer. Verify power is off using a voltage tester.
- Open Timer Enclosure: Open the timer's outer housing.
- Remove Insulator Shield: Carefully remove any insulator shield covering the electrical terminals.
- Remove Timer Mechanism: Locate the metal clip holding the timer mechanism in place. Press the clip and gently lift the entire mechanism out of the enclosure.
Video 1: How the "Little Gray Box" Works! This video demonstrates how to open an Intermatic timer, remove the internal mechanism, and shows the clock motor, electrical contacts, and the manual ON/OFF switch lever. It also details the gear system and how to set the time and trippers.
3.2 Replacing the Clock Motor
- Locate Motor: Turn the timer mechanism over to expose the clock motor, typically labeled WG1573-5.
- Disconnect Wires: Unscrew the terminal screws holding the old motor's wires. Carefully disconnect the two wires from the motor.
- Remove Old Motor: Unscrew the small torx head brass screws securing the motor to the mechanism. Remove the old motor.
- Install New Motor: Position the new WG1573-10D motor and secure it with the screws. Ensure the motor gear properly meshes with the intermediate gear.
- Connect Wires: Connect the new motor's wires to the appropriate terminals. Ensure connections are tight.
- Reassemble: Place the timer mechanism back into the enclosure, ensuring it clips securely. Replace the insulator shield and close the timer housing.
Video 2: Timer motor replacement - what you need to know. This video provides a concise guide on how to replace a timer motor, highlighting the screw and wire connections. It also offers a tip on how to check if the motor is dead by observing the internal gears.
4. Operating Instructions
4.1 Setting the Time of Day
- Pull Out Dial: Gently pull the yellow clock dial forward to disengage its gear from the timer mechanism.
- Turn Dial: Rotate the dial in either direction until the current time of day aligns with the tip of the time-of-day pointer. The dial features 15-minute increments for precise setting.
- Push In Dial: Once the time is set, push the dial back into place to re-engage the gears.
4.2 Setting ON/OFF Times (Trippers)
The timer uses ON and OFF trippers to automate switching. These trippers attach to the perimeter of the yellow clock dial.
- ON Tripper: The ON tripper has a tab closer to the center of the dial. When the dial rotates and the ON tripper engages the top of the switch, it turns the timer ON.
- OFF Tripper: The OFF tripper has a tab closer to the edge of the dial. When the dial rotates and the OFF tripper engages the bottom of the switch, it turns the timer OFF.
- Adjusting Trippers: To adjust the ON/OFF times, loosen the screw on the tripper, slide it to the desired time on the dial, and tighten the screw.
4.3 Manual Override
The timer includes a manual switch lever for temporary operation. Moving the lever to the left opens the contacts (OFF), and moving it to the right closes the contacts (ON). This manual operation will be overridden by the next scheduled ON or OFF tripper event.
5. Maintenance
- Periodic Inspection: Regularly inspect the timer for any signs of wear, damage, or loose connections.
- Cleaning: Keep the timer enclosure clean and free from dust and debris. Use a dry cloth for cleaning. Do not use liquid cleaners.
- Component Check: Ensure the clock dial rotates freely and the trippers engage the switch mechanism correctly.
6. Troubleshooting
6.1 Motor Not Running
- Check Power: Ensure the timer is receiving power from the circuit breaker.
- Inspect Gears: If the timer is powered but the clock dial is not moving, carefully observe the small plastic gears connected to the motor. If these gears are not rotating, the motor may be faulty and require replacement.
- Verify Connections: Check that the motor's electrical connections are secure.
7. Product Specifications
| Specification | Detail |
|---|---|
| Brand | Intermatic |
| Model Name | WG1573-10D |
| Speed | 60 RPM |
| Horsepower | 60 Watts |
| Material | Alloy Steel |
| Item Weight | 3.2 ounces |
| Product Dimensions | 2.25 x 1.44 x 3.06 inches |
| Power Source | Electric |
| Voltage | 208/277 Volts |
| Frequency | 60 Hz |
| UPC | 078275119246, 078275020122 |
8. Warranty and Support
For warranty information, technical support, or further assistance, please contact Intermatic customer service directly. Refer to the official Intermatic website or product packaging for the most current contact details and warranty terms.





