How To Replace an Intermatic T104 Clock Motor

The clock motor in an Intermatic T104 Timer will occasionally fail. If the yellow wheel stops turning but the manual switch still functions correctly, It may be due to one of two failures, the timer motor or the timer mechanism. The following steps show you how to replace the motor, WG1573-10D . Note, this motor is for a T104 220V timer. If you have a 110V timer, T101, use motor WG1570-10D. Please click here to view Intermatic Timers.

Things You’ll Need

• Clock Motor

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Step 1

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.

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Step 2

Inside the Intermatic T104 box, remove the black plastic insulator. The insulator is held in place by one screw.

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Step 3

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.

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Step 4

Compress the tab at the top of the box that holds the mechanism in place.

Please click here to view the Intermatic Timer parts. 

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Step 5

Pull the Intermatic T104 mechanism out of the box.

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Step 6

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.

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Step 7

Turn the mechanism over to the backside and locate the clock motor.

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Step 8

With a small Phillips head screwdriver, remove the two screws the fasten the clock motor to the mechanism.

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Step 9

Remove the clock motor and white cables from the Intermatic T104 mechanism.

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Step 10

Place the new Intermatic WG1573-10D clock motor onto the mechanism. Align the holes on the clock motor with the holes on the mechanism.

Please click here to view the Intermatic Timer parts.  

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Step 11

Tighten the two screws and fasten the clock motor to the T104 mechanism.

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Step 12

Feed the white cables from the clock motor through the cable holder on the mechanism.

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Step 13

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.

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Step 14

Tighten the two terminal screws to terminals 1 and 3.

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Step 15

Press the T104 mechanism back into the timer box.

Please click here to view Intermatic Timers.  

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Step 16

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.

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Step 17

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.

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Step 18

Connect the cables running from the equipment to terminals 2 and 4. One cable will go to terminal 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.

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Step 19

Place the black plastic insulator back into the box and tighten the screw to keep it in place.

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Step 20

Turn on the power at the circuit breaker.

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Step 21

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.

Please click here to view the Intermatic Timer parts.  

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