Can you use an 18 volt dc drill on a pier

Go to e replacement parts and type in your model number.this will give you a parts break down.

Your best bet might be to rebuild those NiCd batteries if they cannot be revived. It is possible to revive NiCds by using 2 good batteries or a high power DC source of about 40 Volts. The details for reviving NiCd batteries are all over YouTube. I suggest you watch a few before attempting to do this. Results are mixed. They may come back almost 100% or they may be done for. In that case you will need to rebuild with new cells. Harbor freight tools are throw away tools. They are cheaply made and have poor support.

There could be a number of things wrong inside the charger, and could cause more problems trying to replace components on the board. Your best bet is to look on ebay or some other place to see if you can get a replacement charger.

Yo Mate, Have you tried contacting Ryobi online. GIve it a try, They have xlnt cust service.
...............dansky66

No. It will probably charge but you will significantly reduce the life of your battery.

go to the tip section and I left detailed instructions on how to do this, or try and go to my profile page under tups. Let me know if you still need more help

No. Not unless you also use the right size diode to make the AC go in one direction only.
AND---- Don't try anything like this with a Lithium battery! We're talking NiCad, right?

Do the same in reverse, if possible. Also, you could use two channel locks as most of those chucks have two rings, the narrow one towards the drill itself being attached to the motor. However, make sure the screw inside the chuck is tight first -- I've seen those back out and block chucks open.

It is usually a current limiting resistor anyway... so I would think that about 100 Ohms should be all good, you generally need about 250 - 300mA to charge ya batteries. It is simple Ohms law calculation.

For USA go here, http://www.dewaltservicenet.com/
For UK go here, https://service.toolcommerce.com/Products/Default.aspx
I work in uk and that is the same system we use, just a few less functions than I get as a service agent.