This is an OEM sourced replacement part designed for use with Makita drills/drivers. It allows user to secure drill bits. The ratcheting action clicks the jaws tightly into place for reduced bit slippage. If your drill\'s bit retention is suffering, the rotation feels stiff, or the chuck has seized up entirely, a new chuck should fix the problem. Please note the screw used to secure this chuck it is sold separately.
Had to replace gear box, chuck, and screw (reverse threads) that secures chuck. Recommend only tighten and loosen chuck by hand, do not hold chuck and use motor to tighten chuck. Save yourself some $.
Remove internal screw, counter clockwise. Remove chuck with star drive, #45, clockwise. Need to clamp drill tightly first. Star drive has to be long to reach into chuck properly.
1. Opened the jaws on the chuck to access the retainer screw for the chuck. Note: The retainer screw has left-hand threads, so turning the screw to the left acutely tights the threads.
2. Back the chuck off the drive stem, the chuck has right hand threads, so it backs off by left hand rotation.
3. Inspection of components, al
... Read morel looks good and matches.
4. Screw the chuck on till it bottoms out.
5. Insert the retainer screw and tighten down.
6. Tested chuck, all systems in good working order.
1. Removed all loose parts
2. Unscrewed screw holding drill chuck
3. Attempted to unscrew the body of the drill chuck with adjustable wrench
4. Attempted to unscrew the body of the drill chuck with an adjustable wrench and vise.
5. Cut off most of the body of the drill chuck with a sawzall
6. Unscrewed remai
... Read morening body by hand
7. Screwed new drill chuck onto drill
8. Screwed in retaining screw.
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Chuck would not stay tight from very heavy use over many years.
I followed the instructions on the web site but the chuck was on the shaft so tight I had to use an impact gun to break it loose. Other than that it was a piece of cake. I didn\'t need a new retention screw but bought one just in case. Left hand threaded screws are hard to find!
1. Viewed the repair/replacement video on YouTube.
2. Removed defective drill chuck
3. Ordered replacement drill chuck and retaining screw on website.
4. Received the replacement parts in 3 days, replaced new parts on drill.
1. Remove plastic cover/case, only one side
2. Remove gear box with chuck, hammer drill chuck is right hand screw, to prevent chuck loose with reverse rotation, inside chuck has left hand pan head slotted screw. Removing left hand screw is easy using impact driver, however, I expect chuck, right hand screwed may not loose due to hum
... Read moremer action operation too many times. So I bought a gear box and a chuck.
3 Attach chuck to gear box.
4.Insert gear box/chuck inside case/cover. perfect alignment/position of all parts will be required before case/cover closing together.
5. Return self tapping screws, even self tap screws should not be \"cross screw\".
6. I don\'t know the best way to remove chuck from gear box. Anyway gear box is useless, remove all gears from gear box and use special tool, chuck may be removed.
7. My hammer drill has BL motor and last longer so it can be equivalent a new hammer drill after replace gear box.
REMOVE CHUCK
1. Set drill power level on \"1\", \"drill\" setting. Important
2. Hand-twist until fully open drill chuck
3. Insert long flat edge screwdriver and turn clockwise (reverse threaded) to remove drill chuck screw.
4. Secure drill to edge of workbench. Insert allen key. Be sure to open the chuck fully by t
... Read moreurning by hand several revolutions against resistance. Use hammer to whack allen key and unthread chuck. It may take quite a few tries.
OPEN DRILL CASE AND REMOVE GEAR ASSEMBLY
5. Unscrew drill case using Philips head screwdriver. Separate case. Be sure the trigger stays in proper position.
6. Pull back metal tab resting on armature.
7. Free white plastic gear assembly. Note the bottom of the armature assembly has a notch for alignment in the case. There\'s also a line on top of the armature for alignment.
8. Insert new gear assembly. It can be fussy.
9. Reassemble case, making sure trigger is working.
10. Once assembled thread on new chuck, being sure to keep the chuck wide open.
11. Insert chuck screw and thread counterclockwise to tighten.
12. Watch YouTube videos.
I threaded the new chuck onto the drill shaft and then installed the retaining screw down the center of the fully open chuck and used a screwdriver to tighten counterclockwise.
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