How to Repair a Lathem Time Clock Motor or Movement

Lathem mechanical time clocks are known for their durability, and many remain in service for decades. When problems develop, they typically fall into one of two categories: motor wear or movement failure. Correctly diagnosing the issue can determine whether a simple repair makes sense or whether replacing the clock is the better long-term investment.

Diagnosing the Problem

If the clock is noisy and losing time, but the printed time matches the clock face:
The motor is usually the problem. A worn motor often begins with a low rumbling sound and may eventually develop a squealing noise. As performance declines, the clock may lose time.

If the clock face shows the correct time but the printed time falls behind:
The movement is likely worn or failing. In many cases, replacing the movement is more expensive than replacing the entire machine. Movement replacements can exceed $225 plus shipping and labor, making a new clock the more economical choice.

Replacing a Lathem Time Clock Motor

Motor replacement on many Lathem mechanical models can be performed with basic hand tools:

• Flat blade screwdriver
• #2 Phillips head screwdriver

Basic Motor Replacement Steps

1. Disconnect power before beginning.
2. Remove the movement by popping off the “C” clip located on the upper left hinge bracket.
3. Gently pull the movement assembly out of the case.
4. Loosen the two Phillips screws securing the clock frame to the case (left and right sides).
5. Locate and loosen the two screws that secure the motor.
6. Lift the motor out carefully. If necessary, gently pry with a flat blade screwdriver.
7. Disconnect the power leads.
8. Rotate the copper “S” spring counterclockwise to remove it.

Install the new motor in reverse order, reconnect the wiring, and reassemble the movement and frame.

Maintenance While the Clock Is Open

While servicing the unit, it is common to:

• Clean lint and ink residue from print wheels using a small wire brush.
• Lightly lubricate appropriate movement components.
• Remove debris buildup inside the case.

Use care when applying any cleaning solvent. Avoid saturating sensitive components or applying excessive lubrication, as this can create future problems.