Trimmer Repair - Replacing the Upper Drive Shaft & Housing (Ryobi Part # 753-04344)

http://www.ereplacementparts.com/uppe... Click here for more information on this part, installation instructions and more.

This particular upper drive shaft is specific to Ryobi manufactured brands, including Ryobi, Troy-Bilt, Yard Man, Bolens, and MTD. To find an upper drive shaft & housing specific to your model, visit eReplacementParts.com.

If your string trimmer is showing any of these symptoms; replacing the upper drive shaft & housing could solve your problem:

1) Accessories not engaging
2) Accessory coupling damaged
3) Upper drive shaft housing damaged
4) Inner drive cable damaged

eReplacementParts.com part number: 753-04344

Tools used for this repair/replacement:

1) Torx drivers
2) Phillip’s driver
3) Wrenches and/or socket set

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. https://www.ereplacementparts.com/art...

[ VIDEO TRANSCRIPT ]

Hi, I’m Mark from eReplacementParts.com. In this video, I’m going to show you how to replace the upper shaft on a Ryobi trimmer. The upper shaft attaches to the engine on your Ryobi split shaft trimmer. The opposite end attaches to the various accessories. The most common reason you need to replace the upper shaft is wear to the coupling where the accessories attach. Replacing the upper shaft is easy to do, and I’m going to show you how.

Upper shaft assemblies, as well as many other parts, can be found on our website. Let’s get started. I’ll begin by removing the accessory from the motor shaft. The handle assembly is secured with five screws plus one anti-rotation screw. I’ll split the two halves by removing those screws. Now remove the trigger and the trigger spring. With the trigger removed, now I can go ahead and pull the opposite half of the handle assembly away from the throttle cable.

Now I’ll remove the anti rotation screw from the shaft, as well as loosen the clamp, then I can separate the shaft from the motor. There are number of components on the old shaft that we’ll need to transfer to the new one, so I’ll go ahead and remove those now.

On the motor end, I have the spring, I’ll pull that away. I’ll also slide the clamp off of the shaft, and then I need to remove the handle. The handle has another anti-rotation screw on the bottom. I’ll go ahead and remove that, and while we are at it, there’s another similar screw on this end of the shaft.

Now I can loosen the screws that secure the handle. And now I can just slide this assembly off of the shaft. Now the accessory clamp. Again, there’s an anti-rotation screw. And the screw that tightens the clamp to the shaft. Now I can install the upper shaft.

You’ll notice that one end of the shaft has a cast female end to receive the accessories, and that’s the end that the clamp goes on.

The opposite end has a slit milled in it, and that end will go into the engine. Now we’ll go ahead and install all the pieces that we took off of the old shaft. I’ll start with the accessory clamp. I’ll slide it onto the shaft until the holes for the anti-rotation screw line up, then I can replace the anti-rotation screw and tighten the clamp screw. Now I’ll slide the handle back onto the shaft. And again, I want to lineup the holes for the anti-rotation screws.

I’ll use the hole that’s closest to the clamp assembly, and I’ll tighten the screws and secure the handle. Then we’ll install another anti-rotation screw. This one keeps the inner cable liner from rotating. Now I can slide the clamp back over the shaft and replace the spring. Now install the shaft back into the engine. The slot should go up toward the top of the engine. You want to make sure that you align the spring with the clutch drum, and then insert the shaft until the anti-rotation screw holes line up.

Now I can reinstall the clamp. And again, line up the anti-rotation screw holes, and install the anti-rotation screw. And now I’ll secure the clamp. Now I’ll slide the throttle cable into the side of the trigger grip. And I bring the cable in until it bottoms out on the shoulder like that. Now install the throttle trigger...

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