timer motor does not keep proper time

this dryer uses a w 10185976d timer control. we disassembled the timer cleaned very dirty points-dryer would not heat- prior to repair and following repair the timer lags time badley ie moves 15 min after being on for 45 minutes. it heats properly on all settings-timer just not moving as it should. we have no wiring dia. or schewmatic for this unit. help please

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It may be that the drive cog on the spindle of the timer drive motor is slipping or that some of the cogs of the gear wheels connected to the drive motor of the timer may be stripped. In a lot of electro-mechanical timers there are usually several gear wheels used to convert the time derived from the 50Hz power supply rotation of the motor spindle to a time based rotation of a wheel. I have experienced it in one of my timers (was an old water reticulation timer - similar concept as your part except it was driving a 24hr wheel with edge operated contacts) where the first two gears were brass and the next three were nylon. No prizes for guessing between which two the problem was.

Hopefully this is of some help.

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