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I see the spool shaft on the spool and not the drive cable. ALL my trimmers were designed for the line spool to come off the shaft (usually by removing the plastic bump feed nut). Your drive shaft appears to have a groove in it about 3/4 toward the top. I surmise that notch is where a broken/missing set screw or "c" clip would most likely hold the shaft to the drive cable. If you find it to be true, a factory part would not ne needed to find a replacement part to lock the shaft and drive cable.
sounds like your shaft is probably wound up,twisted, this happens sometimes, they get frayed, they are a flexible shaft kinda like a speedometer cable., take the screws out that will remove the housing from the motor should be 4 screws and the eng will slide off the tube and then you can see your flex shaft, then take pliers and pull it out and my guess is that you will find it twisted and frayed so that it winds up catches and springs back, GoodLuck
here is an excellent break down of your trimmer, I will explain what has to be done. First remove the four screws that hold the handle plastic housing that the throttle trigger is in to the base of the eng cover on shaft side, you may have to disconnect your throttle cable from carb. or from trigger assy,which ever is easier. then slide motor off shaft and set on bench, next you have to remove the clutch off the eng, so remove spark plug and stuff rope,clothesline what ever soft type rope you may have(nothing with wire or cable in it this will cause damage to cylinder) into spark plug hole , this keeps eng from rolling over while you are removing the allen screw that is inside the center of the clutch cover, turn counterclockwise to remove screw, next the clutch housing will come off after removing the center screw. then you are at the clutch itself take a screwdriver and give it a couple hard blows with hammer towards the left (counter clockwise) being carefull to only put screwdriver on edge of clutch and not on the dogs directly. next unscreww clutch off shaft and finally you remove I think it is four possibly five screws from plastic eng housing and the cover comes off and youn are finally there! next there is a plate inside there held on with 2 screws remove the carefully and carefully remove you spool without removing the rewind spring, and install the new rope, next put spool back in place and there is a cut out for rope on side of spool so once it is in place you can wind the spring clockwise i believe approx 3-4 turnes and tie your pull handle on it and put plate back over it and secure the 2 screws to it and route your wires accordingly to miss any movein parts. next check that the rope pulls out all the way and retracts all the way and doesen't bind up , if every thing is O.K. then reverse the procedure and you will have it back together in no time and running, make sure you hook up your on/off switch and carb. linkage. don't for get to rate this ...... Have Fun !
found this on a web site should tell you what you need to know
I removed the screws from the bottom of the unit to separate mechanism that held the blades from the engine. This revealed a clutch on the end of the drive shaft. I removed the springs so I could remove the two halves of the centrifical clutch. I did this so I could then remove the mount these two halves were around. This mount had an arrow and the word 'off' on it. I placed a block of wood against this mount and hit the wood (protecting the mount) as to spin off the mount in the direction of the arrow. A few sharp licks with the hammer and the mount started to come off. I removed it by hand then. Next I removed screws and spark plug so I could get the green housing off where the cord was mounted. Inside this housing is a white spool the cord was on. Becareful with the next step. To replace the cord I removed the spool the cord is wound on but be careful, under the spool is a metal housing under which is the spring that rewinds the cord when you pull start the unit. The end of the white spool that is out of your sight meshes with the end rewind spring. If you pull too far up on the spring or the metal housing that keeps the spring in place you will have spring everywhere and possibly toward your face becareful. So Loosen the two screws and turn the tabs out of the way that hold down the white cord spool. Slowly work the white cord spool off. Replace the cord on the spool making sure you wind it in the proper direction. Then replace the spool and mesh it with the spring. Turn the spool to wind the spring and retention the pull cord rewinding spring. re assemble unit. Good luck! This is not a step by step but I believe it will get you what you need.
If the noise was up by the handle it may have been the drive pulley breaking loose of the shaft on the motor causing the motor to spin and stop the flex shaft of the trimmer. Another possibility would be the small belt that aids the flex shaft. If those don't fix the problem check the lock nut that bolts the flex shaft to the spool housing. If the shaft broke free from the housing the motor would still run and the shaft would turn, but the spool housing would not spin if it does it could be stopped very easily. Definately check the warranty.
If it's like my Ryobi, the alignment arrows are for feeding in string, not removing the spool. When aligned with the arrows, you should be able to insert two pieces of line into opposite sides of the housing. The ends of the line will come out of the spool next to a tiny hole. Put the end of each of the two lines into the holes, then pull the two lines from the outside. This will lock the ends of the line into the tiny holes in the housing. Now you can turn the housing by hand to wind the lines onto the spool. I think it will take about ten feet of line (on each side).
Alternatively, spin the bump stop out of the assembly. This holds the spool in, so when the bump stop is removed, the spool comes right out.
My coupler was split in two, and I couldn't screw it off. I had to do the following:
1. Take the blender apart (mine had 2 screws on the bottom).
2. Remove the motor housing from the blender (mine was loose from removing the two screws earlier).
3. Remove the fan by removing the fan nut.
4. Take apart the motor housing. Mine had two machine screws with 1/4" hex heads holding a bracket that tied the two ends together. Once those two screws are removed, you can take the motor out of the housing. Be careful on the fan end of the motor, because it's got two spring loaded brushes that will come together once the motor is pulled through.
6. Once you have the motor out of the housing, you'll have something to grab onto so you'll be able to unscrew the broken coupler. I used a pair of channel locks and gently grasped the motor body, and then just used a regular pair of pliers to grab the broken coupler. It's regular thread (lefty lucy righty tighty), so twist accordingly.
Once you have the coupler off, just put everything back together. The hardest part is holding apart the spring loaded brushes while you push the fan end of the motor shaft back through the motor housing.
Took me about 20 minutes to do everything.
I am having the same problem. I took it apart and the plastic cap piece for the pull string spool has a crack. This is the plastic piece that turns the engine when pulling. Because of the crack, the absorption spring under the cap slips out of its hole in the cap. This causes the pull string spool to jam after a strong pull that causes the crack to open up. Now I need to find a replacement part. Any ideas?