Question about Lawn Trimmers & Edgers

Open Question

Broken Drive Shaft

How do I replace the broken drive shaft myself without to much expence?

Posted by on

  • John McKinney May 11, 2010

    I can help you if you can get me all of the numbers off of your unit. (model, serial, etc...) I am sure I could get you a diagram or walk you through it.

×

6 Suggested Answers

  • 1 Answer

SOURCE: Take apart method to replace rubber drive belt.

I had the same dillema, till I discovered a soft spot on the label. They put one last screw there. I got the housing open and discovered the belt was broken. Ordered a new belt ($12.39) through ACE Hardware repair center, now I can't get the belt on. That is why I came to this site.
The Ace guy told me he has had lot of calls for this particular belt. If you order one, I suggest you order two.
Good luck.

Posted on May 15, 2009

  • 376 Answers

SOURCE: Replacing Drive Shaft for a Ryobi 725r

The lower flex shaft should cost around $40, unless you order it online and have to pay shipping. You should be able to get one from your local MTD dealer. (Ryobi is owned by MTD)

Posted on May 25, 2009

  • 1 Answer

SOURCE: Stihl FS45 2 cycle string trimmer. Bought in 5/06

Dealer says shaft has broken. Stihl had a problem with some FS45's doing this. They are trying to have it repaired under warranty.

Thanks for the response.

Posted on Jun 24, 2009

dropndeal
  • 134 Answers

SOURCE: fix the flexible drive shaft has a problem

The Metal Clamp referenced clamps directly on the end of the '2-Piece Gear Box Assembly'. The gear box assembly is an aluminum casting held together by 3 machine screws. The Metal Clamp does not actually lock the drive shaft housing into the gearbox assembly. The flexible drive shaft cable engages the engine output shaft, and the gear box assembly. This is a fixed length (non-adjustable) assembly.

First ensure that the drive shaft assembly is fully engaged at the quick connect fitting and that the "snap" is engaged. Then make sure the knob is fully tightened. The quick connect allows you to quickly switch between various attachments offered on this unit.

Now, based on your description, it sounds like the 'anti-rotation screw' 791-182519 has backed out or is gone. This will allow the entire cutting assembly (gearbox forward) to slip off of the drive shaft housing and disengage the flexible drive shaft. If your cutting assembly is attempting to rotate while in operation, or the drive is not engaged as you described.
Do not continue to operate the unit until you get this fixed as you could strip out the drive shaft end or cause other serious damage to the equipment or yourself.

If it is the anti-rotation screw, then make sure to push the drive shaft housing firmly into the gear box and ensure to align the holes in the drive shaft housing and the gear box. If the screw is lost, then find one similar sized, but be CERTAIN that it is not too long as it will actually engage the flexible drive shaft and prevent rotation, or cut the drive shaft.

Back to the clamp: If it is still wanting to move, then remove the lock nut and place slightly oversized washers on the bolt head and the lock nut. This will force more pressure (does not take much) on the clamp and will lock it down.

I just fixed mine today (071809) in fact and had to drill a new hole in the drive shaft housing as the original was completely wallowed out.

I hope this helps.

DROPNDEAL

Posted on Jul 19, 2009

nova2nv
  • 197 Answers

SOURCE: Ref: Stihl FS46 string trimmer. Broken Flex shaft.

Remove orange sheild,remove single screw holding head in shaft then grab head with pliers and twist side to side until complete head is free.You should then be able to grab part of shaft.On power head loosen screws {about one turn each} that hold two white case halves near trigger,I think there are four,then there is a single torx screw on the bottom of lower case half in the middle that must be taken out to allow tube to be removed.Romove flexshaft from top.Check 4 plastic burnt to flexshaft,if there is you must replace tube liner as well,usally around bent part of tube the liner will go bad.

Posted on Nov 28, 2009

  • 41 Answers

SOURCE: Craftsman weed wacker trimmer head won't turn

it could still have the broken peice from the old one inside the seat.take it apart and look inside and inspect the seat where the drive cable enters.

Posted on Apr 14, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Mine's a bent shaft. I guess only Victa agents can replace/repair the centrifugal clutch or internal broken cable?


not necessarily--- the broken drive cable can be removed /replaced by removing the trimmer head from the shaft at the bottom
undo the clamp and if there is a small screw/ bolt into the shaft undo that as well and pull the head off
the flexible drive cable will slip out
check the ends and they should be square in form
Mostly the cable breaks but occasionally that square section will wear round
slip in a new cable and reassemble

Oct 16, 2015 | Lawn Trimmers & Edgers

1 Answer

How do I replace the upper drive shaft on a Ryobi RBC430SEC brushcutter?


I couldn't find this model on google, but when replacing drive shafts in most brushcutters we used to slide the cutting head / gear assembly off the bottom of the shaft, remove the circlip holding the drive shaft if there was one, slide out the shaft from its square hole in the clutch at the motor end. If the shaft was broken we'd slide the motor part off the shaft to get the broken part of the shaft out.

Nov 10, 2014 | Lawn Trimmers & Edgers

1 Answer

Ryobi grass scorpion rct2800a head keeps coming off. Is there a screw or bolt to hold the head in the housing?


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.

Apr 10, 2013 | Lawn Trimmers & Edgers

1 Answer

No power when wheel spins


You may have a broken drive shaft. Some are braided and flexable and used on curved shaft units. The solid shaft is used on most straight shaft units. Remove the string head and pull the shaft out to look at the ends to see if they are broken or stripped. George

Jun 05, 2012 | Homelite Consumer Products 4.0 Amp, 13 In....

1 Answer

Trimmer runs but the head wont turn


It may be that the drive shaft is broken, or not engaged to the engine. Make sure the trimmer attachment is locked all the way onto the shaft coming from the engine. If it still doesn't work, check by seeing if any of the other attachments work when you put them on. If they do, you know the drive shaft in the trimmer attachment is probably broken.

Aug 17, 2011 | Craftsman Convertible 25cc. Gas Line...

1 Answer

The head stops going round, it sems to me that the drive shaft has become disconnected, can it be repaired by myself.


You need to take the drive shaft tube off the power head and see if it is broken. If the machine has the split boom, then you will need to inspect both. Just turn the end of the drive on one end, and see if the other end turns with it. If it is a one piece drive shaft, then, remove the boom from the front engine cover and turn it, noting if the string head turns too. You can fix this yourself.

Oct 22, 2010 | Homelite Curved Shaft Trimmer Bump Feed...

1 Answer

The lower flex shaft appears too short. The string head will "stall"


It sounds as if the dive shaft is broken, but not to the point that it has come apart. I believe the drive shaft is separating inside the shaft housing and it cannot spring back until you take it apart.

you should take the drive shaft out and see if you can twist it apart along any section of it, (be careful not to twist too hard), I think you will find that it will separate somewhere along the shaft. If it doesn't separate, then you probably have something broken on the trimmer attachment.

Good Luck!

Jim

Sep 19, 2010 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

The flexible drive shaft broke near the bottom. I have removed it from the motor end and pulled out whats left of the shaft, but cannot figure out how to get to the broken end so that the flex shaft can be...


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 -->

Jul 06, 2010 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

I broke the flex drive shaft but can't remove the head to get out the broken shaft piece. I got the big part of the shaft out from the top. the bump head has been replaced by the kind that you cut 2 pieces...


The flex shaft drive you are referring to is only sold as a assy that I am aware of. You can try www.partstree.com for the replacement shaft assy. you are refering to, however you may find out by the time you buy a new shaft assy you may be money ahead just buying a new trimmer.
Sorry

Aug 08, 2009 | Ryobi Lawn Trimmers & Edgers

2 Answers

Engine runs great, no power at head, drive shafts not broken.


The drive shaft is not seated into position properly or the shaft has broken.

Have you had the shaft off recently? If so, take the shaft off again and try to seat the shaft as you gently pull on the rope. If you need further assistance, just let me know.

Jim

Jun 15, 2009 | Troy Bilt Tb70ss Gas Trimmer

Not finding what you are looking for?
Lawn Trimmers & Edgers Logo

Related Topics:

181 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lawn Trimmers & Edgers Experts

Jim Parker
Jim Parker

Level 3 Expert

1040 Answers

Dwain Pippen

Level 3 Expert

376 Answers

Roland W VanLue
Roland W VanLue

Level 3 Expert

375 Answers

Are you a Lawn Trimmer and Edger Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...