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Its possible that the drive shaft is broken or the end of the shaft is worn where it hooks into the gear head. The trimmer head has a hex fitting that meshes with the gear assembly in order for it to turn, its possible the hex is worn on the cutting head from usage, which would require replacing the outer spool assembly. Here is a link to a parts breakdown. http://www.partstree.com/parts/?lc=troy_bilt&mn=TB70SS+41ADT70C711&dn=769014720002
with a strieght shaft trimmer there is a gear at the trimmer head that gear could be bad if it has a arched shaft then its driven by a cable if you spin the head by hand while without it running you might feel some roughness
Hi, take it back to the dealer as the powered or gear box have not been fitted correctly. The noise you can hear is most likely the clutch drive grinding on the drive shaft. Hope this helps, regards Phil.
This unit was not made to have interchangeable heads. Ryobi makes a hedge trimmer attachment for some of its units that are quick connect. Otherwise, you may buy this attachment and see if you can interchange the head from the brushcutter to the hedge trimmer. You may find it more work than you want to tackle.
To replace the trimmer head you don't need to replace the gear case. If you look closely about a 1/4 inch up from the safety guard you'll see a hole in the side of the "gearcase" assemby. (you may have to clean the old dead grass clippings off to see it) You can shove a rod into the hole that will stop the head from spinning freely and I believe you spin the head clock wise (reverse threads) to remove the head.
The entire trimmer assembly (from the gearbox forward) will slide off of the drive shaft cover. On the side of the aluminum gearbox assembly, you will find a single screw. This is the "anti-rotation screw" (do not lose this). Then remove the small (approximately 1" diameter) clamp from the end of the gear box assembly and simply pull the entire cutting assembly off of the shaft.
If you just want to remove the trimmer bump head assembly, then you will need to lock the bump head assembly to prevent rotation while you are working. If you purchased this new, then there should be a small metal rod included with your accessories. This will fit in a small hole in the base of the gear box assembly 791-182193 and prevents the trimmer head from rotating.
Then proceed to remove the following items:
791-180814B (replaces 791-180814) Bump Head Knob Assembly 791-147495 Inner Reel (hold the trimmer string) 791-610636B (replaces 791-610636) Spring 791-612026 Retainer (be careful removing this so you do not inadvertently destroy it). If you intend to reuse the trimmer head. If not, then hack, pry, stab, etc.. until you mangle it enough to remove. 791-683301 Outer Spool & Eyelet Assembly should now slide out leaving only 791-612483 Spool Shaft which I will assume that you want to keep. I replaced my entire string head assembly a couple of years ago (and subsequently misplaced it and am in fact wanting to purchase one) and replaced it with a grass-gater or similar. I hope this helps.