Experienced gardeners share their insights in answering this question :
If this is actually a hand drill you might be able to replace the brushes.

If this is a chain saw and has no torque then:

Saw teeth may need to be sharpened.
Clutch may be worn out and needs replacement.
Saw needs a tune up.

Please post more clarification such as brand, model number, age etc…..
We can then provide specific steps and better defined solutions.



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Adjust the Clutch

The clutch setting is is the most important feature to have dialed in. You`ll see a list of numbers from 1 to 10 or 20. These are used to set the clutch to deliver a torque range. The higher the number on the collar, the higher the torque and the larger the fastener that can be driven.

Variable torque settings makes your drill more versatile and allows you to complete a wider variety of jobs with the same tool. For example, if you are driving screws into a soft material like wood your best bet is to turn down the torque.
A drill/driver powers a constant 550 in/lbs of torque at about 1,500 rotations per minute (RPMs) with permanently engaged gears for high-speed hole drilling or driving simple fasteners.
Similarly, the torque produced by a motor can be increased or decreased through the use of gearing. An increase in torque comes with a proportional decrease in rotational speed. The meshing of two gear teeth can be viewed as equivalent to the interaction of a pair of levers as shown in Figure 5.
If you choose a drill with a torque of between 25 and 50Nm, you can use it for all the usual jobs in and around the house. With more than 50Nm, even professionals will have enough power for heavy screw work.
Drill Clutch

A clutch is designed to slip once the appropriate level of torque is achieved so that the screw being installed will not hurt the material it is being installed into.

The primary reason your screw won`t go into the wood is that it`s reached a particularly dense section of wood, and needs a bit more force. To mitigate the issue, drill a larger pilot hole, use a better quality screw, or get a more powerful drill/driver.
Without brushes to cause friction and slow things down, brushless drills pack more power and torque. They can reach higher speeds, too. “You can expect a 15 to 35 percent increase in performance compared with a brushed motor drill,” says Banta.
The most common reason a drill won`t penetrate a wall at all is because the drill is spinning in the wrong direction. If the drill bit enters the wall and then hits resistance, the typical cause is a metal plate or masonry obstruction.
A common misconception is: the higher the torque rating, the faster the drill will complete an application. That`s not necessarily true. Torque is the force the drill produces to turn an object, not how fast an object will turn.
The most simple means of increasing torque is to run an open exhaust and intake and tune properly.

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