I am unable to identify Intermatic 885L
Add a comment with clear description of timer so I can identify and help.
With mechanical dial timers, once the motor begins to slow down, then motor overheats and burns out. This is true for all electric motors, and eventually all electric motors stop working.
Power pack yard-light transformers, in-wall timers and plug-in type timers are not repairable, even with WD40, because the motor has already overheated.
These timers are replaced with new timer.
However if you have a power pack, since this timers is expensive, you can buy cheap plug-in timer, set power pack to override, and then plug power pack into cheap timer.
With direct wire mechanical box-type timers that are used for parking lot lights and pool pumps, for example T100 series 120V and 240V timers, the clock motor is replaceable. These small motors cost $16 to 60 depending on clock.
Again, add a comment with clear description of timer so timer can be identified for certain.
I can also post the manual if available, and post links to sellers of similar/same timer if replacement if necessary.
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers.aspxhttp://www.aplussupply.com/intermatic/timer.htmAdd a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.