Trimmer Repair - Replacing the Lower Flexible Driveshaft (Ryobi Part # 791-181852)
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- เผยแพร่เมื่อ 8 ก.ย. 2024
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This particular flexible drive shaft is specific to Ryobi manufactured brands, including Ryobi, Troy-Bilt, Yard Man, and MTD. To find a lower flexible drive shaft specific to your model, visit eReplacementParts.com.
If your Ryobi string trimmer is showing any of these symptoms; replacing the lower flexible drive shaft could solve your problem:
1) Trimmer head not spinning
2) Trimmer head makes noise
3) Engine idles, but head won’t move when throttled
4) Drive shaft ends stripped
5) Flexible cable is kinked or broken
eReplacementParts.com part number: 791-181852
Tools used for this repair/replacement:
1) Pick or small screwdriver
2) Phillip’s screwdriver
3) Split-ring pliers
4) Long-nosed pliers
5) Rubber mallet
6) Wrenches and/or socket set
7) Wheel & chassis grease
8) Retainer replacement tool (or a metal tube or pipe that is slightly larger in diameter than the bushing housing drive shaft)
Get model-specific repair help from eReplacementParts.com. Learn how to troubleshoot, diagnose and repair your power tools and equipment with illustrated instructions, hundreds of step-by-step repair videos, and our DIY forum. If you have a power tool or appliance problem, we can help. www.ereplaceme...
[ VIDEO TRANSCRIPT ]
Hi, I’m Mark from eReplacementParts.com. In this video, I’m going to show you how to replace the lower flexible drive shaft in a Ryobi trimmer. The lower flexible drive shaft is mounted inside the tube on your trimmer attachment. Its purpose is to drive the trimmer head. Common problems with the lower flexible drive shaft are the square ends will wear to round, at which point they’ll no longer drive. It’s also possible the damage to the cable if the trimmer head is stopped very rapidly. This can cause the cable to kink or even break.
Replacing the lower flexible drive shaft is easy to do, and I’m going to show you how. Lower flexible drive shafts, as well as many other parts, can be found on our website. Let’s get started.
I’ll begin by removing the bump head knob and the spool. I’ll use a small pick to pull the C-clip away from the shaft. Now remove the plunger and the plunger spring. Now remove the E-clip, the slider, and the two slider springs. I’ll use a pair of split ring pliers to do that. Now remove the retaining clip that secures the trimmer head to the shaft. This part is not reusable, so you don’t have to be real careful when you are removing it. I like to pry it away with a pick, and then use pliers or even a cutter to pull it away from the shaft if necessary. This one’s going to come off pretty easily.
Now I can remove the outer spool from the shaft. The plastic outer spool is pressed onto a metal nut on the back side. To remove it, I’ll strike the end of the shaft with a rubber mallet. You don’t want to use a steel hammer here, because you will bend and damage the shaft. Now remove the bushing housing assembly. First I’ll remove the guard, then the retaining clamp, and the anti-rotation screw.
Next, I’ll loosen the bolt that secures the clamp to the shaft. Now remove the anti-rotation screw and separate the bushing housing assembly from the shaft. And now I’ll remove the lower drive shaft.
Before I install the new motor drive shaft, I’ll lubricate it with a little bit of bearing and chassis grease. A little bit on my finger, and slide that all over the shaft. And now it’s ready to be installed.
You’ll notice that there’s a ring pressed onto one end of the shaft. This is the lower end or the end that goes on the trimmer head. So, I’ll slide the opposite end through the curved portion of the shaft, and insert it until that ring bottoms out, like that.
Now I can install the bushing housing assembly. Before I do though, I want to make sure that I remembered to slide the retaining clamp over the shaft, then the shaft into the bushing housing assembly. Make sure everything lines up, and I’ll secure these two together with the anti-rotation screw and the clamp....
[ Download the entire transcript for this video here: www.ereplaceme... ]
Thanks for a great video. Really helped a lot.
I have a 4 stroke 30 CC Ryobi and the end of the shaft broke off . I had an extension bar on and was using a pole saw to cut wood. I bent it too much and the end broke off. I took it home and repaired it. I had a spare shaft and connected it using this video. The springs caused all the pain and aggravation. My model had an extra spring. From the looks of it, that spring is used to keep the wires/cables in the slot in the back of the trigger housing. My other trimmer had the same extra spring and I could see it holding down the 2 cables/wires. I couldn't figure out how to install that extra spring. I put it all back together and everything seems fine. Trigger works good . Hope it works tomorrow.
Thanks for the video. It was exactly what I needed to fix my trimmer. Your video saved me a lot of trial and error, especially with getting the old retaining ring off and the new one on.
Great video. I have a stihl trimmer that the head is not spinning fast enough so not sure what the problem is but your videos are always great. Great camera work,nice and slow and easy to follow with no background interruptions. I hope my cable is this easy to replace and thanks.
Please let me know if you have any questions with your repair. I will be happy to assist!
As of right now it is back in the shop only a year old and I told them not to replace anything if its not under warranty so we'll see what I end up with. My old weed eater I just work on and had the cable out and it looks really easy to replace so I should be good. Thanks Mark.
only need remove clamp and anti rotation screw, other steps no need but thank you any way
Thanks please. Understood how to take care and maintain the machines.
Whats up with all the extra steps? I just had to remove the guard and clamp and it came right apart.
Hi, i have to swap either the shaft tube over or the head bearing assemble to fit diff head with diff thickness shaft, one thicker than the other. Is the "bearing" simply a bush and how does that not wear out if not a bearing?? also should i try to put some oil into it?
Good video thanks
Glad you enjoyed it!
I have a Ryobi 25.4cc bent shaft that has a broken lower shaft. It has a different line head than in this video, but I thought the shaft would be the same. I ordered the part number you listed and when it arrived, it's much shorter when you pay it beside the outer bent tube.
My question is are there different lengths?
Why was it necessary to disassemble the timmer head? Seems that just removing the guard would allow the head and bushing housing to be removed as one unit.
There's also no reason to remove the trimmer guard, it all comes off as one assembly.
@@jackmackerel4151
I thought I needed some tool to lock the hub from spinning to remove the trimmer housing of the Ryobi 720r I have, but I now realize I just need to unscrew the brush cutter attachment I have on it while holding the trimmer drum. The video shows that the housing is locked in place on the shaft by the plastic hex, so the video was helpful even if it was totally unnecessary to disassemble it to replace the drive shaft 🙃
I thought i needed to replace gear head because the anti rotation screw sheared off.
After disassembling, i found the lower drive shaft cable is stuck in the gear head. It will not come apart from the gear head. Any ideas??
The cable being stuck inside the inner section of gear head, won't allow me to push the gear head back down all the way to the anti rotation screw hole to align the gear head.
Would e been a lot of force to shear that screw. :/
thank you
Why is there a ring on the drive shaft on the drive head? Mine fell off and can’t figure out how to keep the drive shaft from falling out again.
What about the protective sleeve , how do you replace it with a new one ??
Good Job.!!!
Are all drive shaft the same length.?
I watch all the videos..
I am actually starting a spare parts shop in California..
I need to know which company shafts to procure for all types of trimmers...
Companies such as Stihl, Husqvarna, Echo, Ryobi, and others..
I have MTD trimmers that use Elliott flex shafts..
For other companies what company flex shafts to procure..
Any help will be appreciated..
Thank you..
The ryobi that I have is the 28000 on the troudle have other clip that don't show on the video and I don't know where it is going conected to.
Thanks for he video. However, my Stihl is hard to get the cable back into it's housing. Done everything but to no avail!
Unfortunately we are not a Stihl Service Center. And I am not familiar with their trimmers. Try to contact a service center in your area.
What keeps the drive shaft head from falling off? The anti rotating screw is it for the head not turning?
That also retains it from sliding off, along with the clamp holding it.
You just put it (lower shaft) into the shaft of the trimmer and it locks onto the motor?
Mine just came off with the head but it's not broken.
My cable is stuck.unsude the gear head. I can't get it loose nor get the gear head to seat far enough down. Any ideas?
@@mj-ls7qr8xp3n mine was an easy fix - the shaft just wasn't secured enough to the guard and that's why it came off.
I honestly wouldn't know what the issue is with yours, I'm a noob when it comes to these.
Do you mean the trimmer line? If so, you'll need to undo the bob to unwind the trimmer line.
Is there some procedure to lubricate the bearing in the trimmer head? Thank you.
I had a bearing seize after several years of use. I replaced it and lightly packed the area will bearing grease. I had to remove the bolts as there was not any fitting to apply grease.
Nice!
this is a great video, however, I have a CS26 ryobiand need to replace lower flex drive shaft. the video does not show the style I have. It has tube and a 1/2 inch nut on the lower end.How do I remove it?
Hi Dawn, the lower flex shaft is not available. You will order the 308038010 Curved Shaft Assembly.
How do u do that on a murray weedtrimmer
Where did you get your tool pouch? I use to have the same one but I can't find them anywhere.
Hi Juan, our technical purchased two tool pouches from one of the big box stores and then he used rivets to connect them back to back.
and where do you buy your driveshaft from ??
What are the pricing of the flex shafts and their lengths as well
Thanks for the question. You can find this shaft here: www.ereplacementparts.com/lower-flexible-drive-shaft-p-282797.html. It is 24 3/4" and is priced at $48.74USD for an authentic OEM product. We hope this helps!
Hey! I have a brand new P2500 Poulan Trimmer with the shaft Housing sligltly bended. Never started. Could I fix (unbend) the housing and the machine will work properly? Greetings from Mexico !
Depending on how bad the bend is and if the shaft is crimped. The inner drive cable is flexible and runs through the outer shaft through several bushings inside. If the bend is minor you will probably be ok to just use it. You can straighten the shaft as long as you don't damage the inner bushings.
Ok Thanks a lot !!
Why would you take apart the trimmer head just to replace the shaft?
Complete waste of time and parts.
Do you have driveshaft
I can order sir
Hey, I need flexible driveshaft for Bandit Homelite SX 135. Where I buy this element/unit?
This part is showing as No Longer Offered by the manufacturer. Craftsman also has the same part list as not available. The part number is 986117001. You may be able to search on line. Someone may have one left in their stock.
Where can I get to buy the flexible lower shaft
Hi, you can purchase the part number 791-181852 Lower Flexible Drive Shaft at www.eReplacementParts.com or you can call 1-866-322-9842 and order it with one of our representatives.
Title should be “How to replace line trimmer shaft in 200 easy steps!”
Some of these repairs certainly are complicated! We always try to be as thorough as we can, as many beginners are using our videos for their home repairs. Thanks for watching!
Replacing the lower drive shaft is about as 'easy to do' as building your own space rocket....! Bin the strimmer, buy a new one, and add 6 months to your life expectancy - oh, and save yourself 500 dollars on all those special tools you need but don't have.....and will never find a use for again.