Motor runs well but trimmer head does noy rotate

SOURCE: Black and Decker Grass Hog Model #GH1000

the drive cable probley kinked or bent and does not drive the head the cable goes from the motor to the head take the clamp bolt out and lift the head off the cutter check the cable

SOURCE: Black & Decker gh1000 trimmer head not spinning

The same thing happened to me. You either have a ruined belt pulley, or, hopefully, the belt burned out. Belts are easy to find online, but the housing is tricky to remove - see other posts.

I finally got it the plastic housing apart on my trimmer (there is one screw hidden under the label), only to find a total meltdown. The plastic pulley is ruined, and the only way to get it replaced is to buy a new motor (the most expensive part).

If your trimmer is no longer under warranty, then you can get a refurbished gh1000 for the price a new motor unit.

SOURCE: motor works fine, but trimmer will not rotate

Have an assistant start and hold the trimmer. At idle, there should still be a little drag on the clutches to make the shaft spin on that split shaft trimmer with the accessory head removed. No need to rev it or do anything fancy, but teamwork will make it safer.

Now forget about the engine and clutches - does the accessory head spin freely when turned by hand (removed from engine still!) and with a clear rotation of the shaft end visible inside the connector socket? Is the shaft end square with sharply defines angles, or rounded off? Does swapping in a different accessory function normally and as expected?

Sometimes the nub end of the shaft wears. Worse, the socket on the engine side has eaten itself to pieces. Worse, worse yet, clutches in the engine side that engage the accessory shaft are worn and there is simply no transmission of power. Good luck, hopefully this info will set your boots in the right direction!

SOURCE: I can not remove the

The knob is definitely a LEFT handed thread....try this...take a shop rag and double it. Wrap it around the red knob and with a pair of channel locks or large pliers...carefully turn it in a CLOCKWISE direction it should break loose...some crud or water may have gotten in the threads of the cap and are binding it....good maintenance tip....when you get it loose clean the threads and lubricate them with a small amount of grease on the threads....won't stick again...hope this helps...;-D

SOURCE: The motor starts and runs. The trimmer head does

The clutch is not working. You will need to check the clutch and clutch drum to be sure which will involve taking apart the housing to get to it. If this unit is less than a year old, I highly recommend taking it in for warranty service.