Where is the defrost timer located on Maytag Model # PBF1951KEW ?

SOURCE: Defrost timer

http://www.us1internet.com/FRS24XGCW2_141846.htm

The above URL will take you to an exploded view of the controls. Look at number 23 which will be located behind toe plate below door on the left side. That is the defrost timer. Rotate the clutch head screw Clockwise SLOWLY until you hear a loud click. That is the defrost timer starting the defrost. If the unit restarts after 18-22 minutes and defrost does not take place you problem is most likely the defrost thermostat.

SOURCE: defrost timer location

need to know the make and model...

GE are in the top right back
Frigidaire are under the toe plate left and right also in the back by the compressor. cheaper frigdaire are in the middle center top refer... so you see they hide them in a lot of places..

SOURCE: Maytag PBF 2255 HEW refrigerator defrost timer location?

These look like schematics that might help you.
http://www.partselect.com/AdvancedModelSearch.aspx?ModelNum=PBF2255HEW&mfgModelNum=&fkMfgID=1

SOURCE: WHERE IS THE DEFROST TIMER LOCATED ?

Hi

The defrost timer is sometimes found behind the front grill of the refrigerator. It may also be found behind a cover plate inside the refrigerator or freezer, in the temperature control console, or behind the refrigerator near the compressor.
The timer is usually held in place with one or more screws. Remove the screws and gently pull the timer out far enough to disconnect the wiring connector.
Locate the timer switch and turn it clockwise until you hear it click. One click and the refrigerator shuts off = defrost mode, second click the compressor and fans come back on = run/cooling mode.
*Some defrost timers are a constant or continuous run timer, which means when ever the refrigerator is plugged in the defrost timer is powered up and running. Some defrost timers are an accumulative run timer, which means when the refrigerator is off the defrost timer is off and not running, when the refrigerator is running the defrost timer is running. This is also sometimes called a demand defrost. The power for the defrost timer goes through the cold control first on an accumulative defrost system. The timers are often the same but will be wired differently to get the different operations.

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Thanks
Rylee

SOURCE: maytag fridge defrost timer location

If this unit has the temp controls in the middle top of the fridge then it is in there.