Question about Garden
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Posted on Jan 02, 2017
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
I have the same model. Home Depot assembles their trimmers then sells them, so I didn't get the stuff that comes with it. A 3/16" punch works perfectly.
Posted on Aug 24, 2009
you dont say what model Stihl, lets assume its FS80/85. the torxs style screw driver is part of the tool kit supplied with the machine and includes spark plug spanner 3/4 AF, remove the four screws to release the starter assembly, the starter also retains the fuel tank, dont lose the oblong rubber insert or the tank will wobble around when assembled. if the rope wont return the end of the rewind spring may have broken off or it maybe that the spring has got so rusty its just hanging up. with the recoil off remove the centre screw (normal anti-clockwise) holding the starter away from your eyes, withdraw the pulley and inspect the spring for damage which normaly occurs at the end that engages with the pulley, if it's broken and you cant get a replacement use a pair of pliers to grip the spring about 3/4 inch from broken end, heat with blowtorch to soften and rebend into a hook to engage with the pulley, dont try to bend without softening, clean off any rust with wire wool and re-install the spring in it's housing working from the outside toward the middle.it's more of a knack than anything else and you could probably do with eleven fingers. having installed the spring make sure the rope is fully un-wound and insert the pulley into the housing turning gently until you feel the spring engage, you will know you've got it right when the pulley attempts to rewind, fit the pulley retaining screw, you will observe a notch in the outer rim of the pulley,make sure that the rope is in the notch and use it (the rope) to wind the spring about five times, check that the whole rope rewinds into the pulley, if you still have some hanging out put more turns on the spring but dont over do it. to check, gently pull on the grip until you come to the end of the rope, thats the important bit, you must come to the end of the rope before you come to the end of the spring otherwise the spring will break again.install the starter assembly by offering up and slowly pulling on the grip until you feel the pulley engage with the starter pawl. good luck.
Posted on Aug 31, 2009
You should find a hole in the piece just above the trimmer head, this should line up with another hole deeper in the area. You stick a piece of rod in there to keep the head from turning. Use some pb blaster penetrating oil to help loosen up the head.
Posted on Feb 25, 2010
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