Most Lathem clocks have two areas that need service; the most common is the motor.  The other area, albeit less common, is the movement. 

If the clock is noisy and losing time, but the printed time always matches the "face" time, then you should replace the motor.

If the “face“ is on time but the printed time is falling behind, then the movement needs replaced.  At this point, you would be money ahead to replace the machine, as the movement costs $225.00 plus shipping and $90 labor

The Lathem time clock motor is easy to replace.  It starts with a rumbling noise, then one day it is squealing.  The Lathem time clock motor is replaceable with just two tools: a flat blade screwdriver and a #2 Philip's head screwdriver. 

Simply remove the movement by popping off the “C” clip on the upper left hinge bracket, then pull the movement out. Next, loosen the two Philip's head screws that hold the clock frame to the case, on the left and right.  Loosen or remove, either way is the same result.

Now taking the same screwdriver, loosen the two screws that lock in the motor.The motor should lift out or it may need pried out using that flat blade screwdriver.  Disconnect the power leads and rotate the copper “S” spring counterclockwise to remove it.

Reassemble everything, squirt some oil in to the movement.
If you have a wire brush handy, Scrub the lint and ink off of the print wheels.
Wash the movement with WD-40, dry it with a hair dryer (get it hot!) for 5 minutes.
Let it cool down, and reassemble the machine.

We have the motors, we have all the parts. 
We can even do this for you and guarantee the work.