Question about Troy Bilt Tb70ss Gas Trimmer

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Weed trimmer attachment shaft sheared at trimmer head. Repair?

I can hear the shaft turning bur the head does not. I assume it sheared at the head. Can this be repaired? Am I wasting my time if I attempt to open it up and see if parts can be replaced?

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Posted on Jan 02, 2017

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  • 49 Answers

SOURCE: Troy-Bilt Trimmer TB425CS

Sound like the clutch is going out or already is bad. There should be a cone shape cover that attaches the engine to the handle. Usually with 4 screws. Take those screws out and seperate the housing. There is a small centrifugal clutch, which is probably bad.

Posted on Jan 30, 2009

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dropndeal
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SOURCE: remove the trimmer head from shaft

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.




Posted on Jul 19, 2009

  • 41 Answers

SOURCE: string trimmer cutting attachment doesn't turn fast enough

Take the shaft off at the motor,see if any thing is worn there.Also,take head off of end of weed eater,check for grass or any build up in there.

Posted on Aug 29, 2009

  • 7 Answers

SOURCE: shaft disengages and trimmer head stops spinning

something wrong with your cintrifical force clutch . it is problably set too loose so the the shaft wont engage

Posted on May 12, 2010

  • 1 Answer

SOURCE: Tryingto replace my troy built weed eater's head

clean grass off between shaft and the top of the head. hold weed eater still and turn the head, looking between the shaft and the top of the head. There will be what looks like a hole. Place something there that will keep the shaft from turning, then twist the head off.

Posted on May 25, 2011

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Take the shaft off at the motor,see if any thing is worn there.Also,take head off of end of weed eater,check for grass or any build up in there.

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Sound like the clutch is going out or already is bad. There should be a cone shape cover that attaches the engine to the handle. Usually with 4 screws. Take those screws out and seperate the housing. There is a small centrifugal clutch, which is probably bad.

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