Why doesn't the second speed of my Stanley Fatmax FMC627 drill work?

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Your Stanley Fatmax FMC627 is equipped with a speed selector (number 6 on the manual diagram) that allows switching between two speed ranges: 0-450 RPM in 1st speed and 0-1800 RPM in 2nd speed. If the 2nd speed is not working, here are the points to check in order:

Check the speed selector: Locate the sliding slider on the side of the tool (mark 6). To activate the 2nd speed, you must slide it forward from the tool (towards the chuck). Press firmly until you hear or feel a click. A simple positioning without complete engagement prevents switching to 2nd speed. Ensure that the slider remains locked in the forward position.

Battery status: The 2nd speed (1800 RPM) consumes much more energy than the 1st speed. If your 18V Li-Ion battery is partially discharged, the tool may refuse to switch to 2nd speed or disconnect instantly. Fully charge your battery (charging time between 45 and 240 minutes depending on the charger model) before testing again.

No bit attached: Perform this test without any bit or attachment installed. An already engaged load (bit stuck, chuck excessively tightened) can prevent switching to 2nd speed. Also, clean the inside of the chuck by regularly opening it to remove debris that could create resistance.

Selector blockage: The selection mechanism may be clogged. Clean the sliding selector and the area around it with a dry cloth. Do not use abrasive detergents or solvents. If the slider remains stuck or does not slide freely, the transmission system may be damaged.

If after these checks the 2nd speed still does not work, you can test the proper functioning of the motor in 1st speed (0-450 RPM). If the motor starts normally in 1st speed but categorically refuses 2nd speed even with a charged battery and engaged selector, this indicates a mechanical problem in the transmission that requires professional repair from Stanley support or an authorized repairer.

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