I have a Hitachi DS18 DVB cordless drill and the chuck started to lock up.It's very hard to turn it to loosen or to tighten the chuck. It looks like it will require two very thin wrenches to remove it but I'm not sure and would appreciate any help out there.
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Re: hitachi cordless drill, removing chuck
Replacing the chuck on a drill is simple when you know the trick. I worked at a tool rental center while attending college and learned how to repair many tools. Open the chuck enough to remove the screw that you will see inside the chuck. It will most likely be reverse thread. The chuck is threaded on the shaft so just simply close the chuck on an allen socket and impact off with air or electric impact tool. If you do not have an impact tool close the chuck on-to the largest allen wrench that will fit into the chuck.(with the long part of the allen wrench projecting out) You will need to set the drill into a vise or strap to work-bench, then strike allen with hammer. Most chucks are removed with one quick impact of the hammer, counter clockwise. Do not squeese the drill too tightly with vise, we used a piece of leather to protect the drill. Good luck. Enjoy
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Pound roll pin out of black trigger and remove. Turn silver slotted part with screw driver and the two valves will pop out. Usually it's the flat trigger bushing that is bad and makes it leak. I have all parts.
If its working ok, dont take it apart, just give it a bath in diesel. Diesel fuel and a small brush will keep it clean and lubed from the outside. Keeping using few drops of oil once or twice a day. If the cylinder is sticking open (air out head when you connect air), remove head and pull out the cylinder and clean /lube with white grease. If the cylinder has fine scratches where orings make contact, sand with very fine sandpaper untill smooth. Make a gizmo that you can turn with drill that will fit into the cylinder and spin the cylinder while you sand. I use a 1.5 inch solid rubber bushing with 1/4 " shaft pushed thru; fits snuggly into cylinder (or just turn by hand). Good luck
Check the date of the bottom of the gas. With the gas removed when you fire it you should hear a faint spark sound from the top. If gas is in date try putting it in your pocket for 10 minutes to warm it up. Open the front and make sure the piston is pushed all the way up into the machine.
Use a punch as close to the size of the driver as possible and tap it with a hammer until the blade retracts and clears the jammed nail. Be careful and only hit it as hard as needed to clear the jam. Sometimes it will require a few good "whacks" with a hammer. Much easier then disassembling the tool and I clear jams on customers tools like that all the time here at my shop.
UNPLUG the tool. on the trigger itself you will find a roll pin, remove it then with the trigger off you will see what appears to be a slot for a straight screwdriver, you can lay a screwdriver blade the width of the slot and turn to loosen and remove, next on the front there is a spacer with o rings on it carefully remove it and the spring can be removed. If you go to "ereplacementparts.com you can download a schematic for this. On the left side click on the Hitachi parts and go to nailers and scroll down till you find your model is is on the left side of the mini page click on it and you can see the schematic. Let me know if you need more help
The NR83a has an adjustment just below the triggering plunger. It is a 6mm hex head bolt with a locking nut. Loosen the nut and adjust screw out several turns and re-test. Make adjustment as necessary. I have seen many of these gun without the locking nut which allows the bolt the adjust itself all the way down. AS parts wear this screw needs to be adjusted. The pushing lever and the plunger are wearing smaller/shorter, that is unless the locking nut was missing. Remove gun from air supply for safety when making adjustments. Good Luck an email if you have other qustion about this gun.
The roofers that frequent my shop want their nailers to work like machine guns. Here is what I do to make the hitachi 45 nail fast. Remove the cylinder and sand the fine scratches where orings meet cylinder. I use a rubber slug with a small bolt through the center. The rubber slug fits snuggly into the cylinder and the bolt into chuck of drill. Turn the cylinder with the drill while holding fine sandpaper against the scratches untill smooth. remove the nose from body and replace the sheet (part # 877125) and the bumper. If the sheet fits loose on the driver and the bumper has cuts or missing pieces, the driver will not return with full force. also the oring on the piston should not be too tight. Just snug enough to hold the weight of the piston. While nose piece is off check the air passage to feed piston for trash, use a small wire and push through to make sure. Make sure the orings on the feed piston fit snug. Actually push the feed piston by hand in the nose piece to make sure the three orings fit snugly. A loose feed piston will reduce nailing speed. Finally replace the boot on the firing pin. If the boot is blown off its seat with use replace the firing pin. A loose firing pin will waste air and lower pressure reducing nailing speed. Good luck