Question about Stihl String Trimmer Brushcutter Service Instruction Manual Fe 35 40 55 Ec 70

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Will a fs66 gear head fit a fs76 trimmer

Gear head is bad on fs76 trimmer and want to know if it will interchange with a fs66 gear head

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2 Answers

Weedeater repair


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

Jul 18, 2014 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

Does anyone know of another gear head that fits on a Stihl FS66 trimmer?


I was told the old shaft is 7/8 and the new one is 1 ". Looks like you could use a sleave.

Aug 25, 2012 | Stihl Garden

1 Answer

Grinding Noise from Trimmer


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

Jul 28, 2012 | Garden

1 Answer

Just bought a brand new Husqvarna 224L Trimmer. Started it up and it runs fine. But the trimmer head will not turn. It just makes a grinding noise. The manual that came with the trimmer is useless. It says...


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.

Jul 21, 2011 | Husqvarna 28cc Gas Line Trimmer

1 Answer

How do fit a hedge trimmer attachment to a rbc 40 sb brushcutter ? thanks


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.

Sep 26, 2009 | Ryobi Garden

1 Answer

Finding parts for a stihl fs66 weed eater


I dont think it would be wise to fit used parts to a
twostroke engine and parts of a bigger model
wouldnt fit.

Sep 04, 2009 | Garden

1 Answer

I need to replace the whole trimmer head and I dont know how to get the gear case off so I can put the new one on. Can anyone help?


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.

Aug 27, 2009 | Echo Rapid Loader, Trimmer Head

2 Answers

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.




Jul 16, 2009 | Troy Bilt Tb70ss Gas Trimmer

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