Replacing Drive Shaft for a Ryobi 725r

String Trimmer Drive Shaft Replacement - Poulan Pro ...

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www.youtube.com/watch?v=A_Sv1S7r_-o
Mar 4, 2013 - Uploaded by RepairClinic.com
This video provides step-by-step instructions for replacing the lower drive shaft on Poulan string trimmers. The .

If not a clutched model, likely the flexible drive shaft is broken. Check 1st to insure the engine head is firmly positioned into the aluminum shaft case. If it is remove at the engine, disconnect the cable as necessary and pull out the shaft for close inspection.

Shaft needs to come out the top, will have to split the case or remove motor from shaft to pull cable out

Hi enriquemon,
To remove the drive shaft, loosen the clamp that is just above the protective shield and remove the set screw attaching the drive shaft tube to the trimmer housing. Remove the drive shaft and if you want clean and inspect for damage. You are installing a new one so it is not an issue. Coat the shaft with a high quality, multipurpose lithium grease. Make sure the ends of the shaft are properly located in the drive adapters when assembling. Depending on the amount of time it is used, the drive shaft should be cleaned and greased every year or two. I hope this is helpful to you. Any questions welcome. All the best and good luck.

I believe what you need to do is remove the 3 screws on the trimmer head to remove the head from the lower shaft. After the head is off you can look down into where the shaft goes and be able to use some needlenose pliers or something of the sort to pull the broken part out.<!-- from fixya rte -->

it comes out but you have to lossen the screws holding the engine on at the base and pull it out? the other end has a locking nut remove the spool and loosen

You can buy new Line to re-spool on your existing head

To get the original parts:
http://www.ereplacementparts.com/ryobi-725r-41bd725a734-handheld-trimmer-parts-c-7931_15633_18592.html

there is definitely a problem in the drive shaft. check to make sure there's nothing blocking the mal and female ends. if there is, clean it out and lubricate it so that the male will attach to the female slot. also check to see that both ends are not stripped. if the motor portion of it is stripped, which most liekly is out culprit, then it needs to be replaced, or you need to get a new trimmer. if you do, i recommend the Ryobi model CS26 gas trimmer.if the atachment shaft is stripped, the the attachment needs replacement. if you replace the motor portion you need not lubricate the attatchment slot. if the attachment is stripped, it needs to be replaced, but im quite sure the female end in the motor shaft is our problem. it could also be broken inside the shaft. make sure nothing falls out if you hold the attatching ends to the ground.

It could be simple. Sounds like the drive cable came loose or broke. You could get an estimate from a repair shop -- probably not terribly expensive.