I need a new spring to replace the lost one that makes the spool advance. Its a Grass hog that is a few years old. Not battery powdered, but electric. Can yoy tell me where to buy one or what size springe I need to replace the old one. My zip is 85308, Glendale AZ.

It sounds like that the automatic line release is damaged.

1. Remove and clean all debris from the head. I assume that you have already done this if you have changed the line a few times, but just make sure.

2. Remove the the head from the shaft.

3. There should be a large spring in there. If its broken, damaged or missing that will allow the head to spool line pretty fast. again make sure all debris is removed from this area.

4. Check the feed dogs in the same area as the spring. If they are worn the same problem will occur.

5. Install line on the spool.Make sure that it is wound the proper direction. There should be arrows indicating this. The line wound in reverse will also cause the same problem as well.

6. Put it all back together and see if works now.

7. If this doesn't solve it you may need to replace the head assembly.

Good luck!

For the cordless Grass Hog, the replacement spool is AF-100. You can purchase these spool heads online or maybe find them at your local hardware store, but they may be hard to find because the Grass Hog is not made any more.

You should be able to download a new manual at the following link. I hope this helps.
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Which part of the Grass Hog did you take apart? If you mean the spool head, that is easy to reassemble. The actual spool (the round part with the line coming out) goes into the cavity on the bottom of the trimmer, with the line poking out of the hole in the side several inches (not enough to hit the plastic guard). Then the cover (orange with the spring on it) fits on top of the spool so that the spring pushes on the spool and the two tabs on the side snap into the holes in the trimmer.

Unless you took another part off, that should be all you need to do to reassemble the Grass Hog. Turn it right-side up and turn it on to make sure everything works.

To lengthen the string:

- Turn the Grass Hog upside down
- Push in on the two release buttons on either side of the spool (they're orange)
- Pull the spool head off and spin it to release more string while you pull the string with your hand (make sure it is still fed out through the hole in the base)
- Pop the spool head back into place

Test the Grass Hog to make sure the string is not too long. If it is you'll hear it cracking against the plastic guard on the base.

Is the string spool seated on the rachet correctly? If so and all is well, it is worth noting that these trimmers auto feed fuunction is problematic at best, requiring manually unwinding some line every few minutes as the unit gets older.

For Black and Deckers: Remove cup from bottom of unit by depressing 2 detent tabs and pulling away from unit. Replace empty spool with new full one or wind on aftermarket string. Wind in direction of arrow on spool. Make sure spool is seated on rachet firmly.

No, just the part that trims.

Do you remember putting the spring back in when you filled it with new line. You mite check to see that it is in there.

Good luck

After removing the screw, I had a heck of a time pulling off the old spool kit. I ended up running a rope through the holes that the cap clips into, stood on the rope and pulled up on the Grass Hog. Finally I managed to pull the old kit off. I managed to put the new one one, but I'm not 100% sure whether the cross-shaped piece at the bottom of the post is perfectly lined up with the new spool head. I was able to replace the screw and so far it seems ok.