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The clock motor in an Intermatic T104 timer will occasionally fail. It is time to replace the mechanism if the yellow wheel stops turning but the manual switch still functions correctly. The following steps will provide a guide on how to replace the WG1573-10D.
TURN OFF THE POWER TO THE TIMER BOX. There should be a circuit breaker before the timer box where the power can be turned off.
Inside the Intermatic T104 box, remove the black plastic insulator. The insulator is held in place by one screw.
With a flathead screwdriver, loosen the screws that hold the ground cables and power cables in place. Pull the cables away from the Intermatic mechanism.
Compress the tab at the top of the box that holds the mechanism in place.
Pull the Intermatic T104 mechanism out of the box.
Place the T104 mechanism on a smooth flat surface with the yellow clock dial facing up. Remove the two screws, from terminals 1 and 3, that secure the two white clock motor cables in place.
Turn the mechanism over to the backside and locate the clock motor.
With a small phillips head screwdriver, remove the two screws the fasten the clock motor to the mechanism.
Remove the clock motor and white cables from the Intermatic T104 mechanism.
Place the new Intermatic WG1573-10D clock motor onto the mechanism. Align the holes on the clock motor with the holes on the mechanism.
Tighten the two screws and fasten the clock motor to the T104 mechanism.
Feed the white cables from the clock motor through the cable holder on the mechanism.
Turn the mechanism over and place one white cable onto terminal 1 and the other onto terminal 3. It does not matter which white cable goes to terminals 1 or 3.
Tighten the two terminal screws to terminals 1 and 3.
Press the T104 mechanism back into the timer box.
Connect the ground wires to the green screw located on the Intermatic timer mechanism. The ground wires will be green or exposed copper. One ground will be coming from the breaker and the other will be from the equipment.
Locate the two input power cables that come from the breaker. Connect one to terminal 1 and the other to terminal 3. Terminals 1 and 3 are called the "Lines". Note: it does not matter what color goes to 1 or 3. It only matters that one cable is on 1 and the other is on 3.
Connect the cables running from the equipment to terminals 2 and 4. One cable will go to teminal 2 and the other to terminal 4. Terminals 2 and 4 are called the "Loads". The Loads are what the timer controls. Note: it does not matter what color goes to 2 or 4.
Place the black plastic insulator back into the box and tighten the screw to keep it in place.
Turn on the power at the circuit breaker.
The Intermatic WG1573-10D clock motor should now be successfully installed if the yellow clock dial is turning. Close the timer door and continue to enjoy the energy savings of using a timer.