Mini Excavator keeps throwing the tracks - Missing lock nut on the track tensioner may be the reason
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- Опубликовано: 21 июл 2024
- A comment from a viewer on a previous video prompted me to look at the track tension adjustments on my own unit. He had been throwing a lot of tracks and suspected he was missing a lock nut to hold the tensioners in the desired position. It turns out my unit (the same make and model as his) was also missing these nuts. In this video I show how I went about determining the proper thread size and thread pitch so I could confidently order a pair of lock nuts. Will they fit? Watch to find out.
If you own an AGT LH12R mini excavator, this lock nut should also fit on your unit. If you own a different model, this video will show you how to find the required nut size.
If anyone knows whether these models were supposed to have the lock nuts from the factory, or if they just decided to skip this important feature, please let us know in the comments!
Thanks to @RiverForged on IG for help with the thumbnails!
Some of the items featured in the video are available on Amazon.com. We purchased all of the equipment and gear seen in this video with our own funds. This is not a paid promotion, but we are an Amazon affiliate. We’ve added links in the description for your convenience. As an Amazon Associate, I earn from qualifying purchases. There is no added cost to you.
Hexagon Head Lock Nuts - Stainless Steel Metric M24 x 2 mm
amzn.to/4e8FJTm
36mm Combination Wrench (to fit the above lock nuts)
amzn.to/3RgsHJt
00:00 - Does your excavator keep throwing tracks?
00:43 - Don't be afraid to ask!
01:00 - What is missing here?
02:00 - How to determine the thread diameter and pitch
06:05 - Found a source for the nuts- will they fit?
07:50 - Wrap up 
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Yep got the same machine and locknuts missing. Thks for your guidance.
Glad it helped
Thank you for sharing. Very good information.
Glad it was helpful!
Nice Job!
Thanks!
I ended up buying a 36mm open end wrench on Amazon. My mini skid steer uses that same nut for both adjustment and lock nuts. Nice video!
Thanks! I have one ordered, too.
Wow, what a valuable effort and forum. Keep it going. Thanks!
I am delighted to know you find value in it. That's the kind of feedback that motivates me to keep it going. Thank you!
I have seen vids on other models where they did have lock nuts. The 'L' series seems different enough it may be made in a different factory, my guess. Another YT'er at "The Garage Connection" has a lot of tech vids on the H series machines. Some have the hydraulic relief valve set too low and you do not get full power from the bucket. He also had a kit that bolted on and helped protect the drive motors that looked interesting. Final thing was a hose that screwed onto the motor to help when draining oil during future oil changes looked helpful.
I may sell some logs from my wooded property and will need to re-invest in some equipment but just doing research till then.
Thanks for the tips. I'm sure I'll be adding a lot of those common upgrades in the coming weeks. Speaking of wooded acreage, I've been back into the online auctions and will be rolling out another machine purchase soon. Stay tuned.
Awesome video! I'll bet this one will draw a lot of attention!😄👍🏻
Thanks! So far, so good.
My l12 had a bad grease fitting on the track. Mine is greased tensioned. It is a 2023 l13
That's interesting. I've wondered what the differences are between the L12 and the LH12R. So, mine apparently has the grease pressure warning stickers from an L12 but no grease tensioners to go with it. The AGT website has no information to help us sort out the features of their various models.
Why is there a warning label about high pressure oil cylinder for track tensioning? I would have assumed it had the grease pressure track tensioners, not the threaded rod.
I have no idea, but like you, I assumed this would have the grease pressure tensioner because of that sticker. When a viewer comment tipped me off to go looking for the lock nuts, I was shocked to actually see that mine has the screw tensioners.
Do you know if the LH12 I get in auction actually has grease tensioners in there if they could be swapped with the threaded ones?
Sorry, but I have no idea. I've never even seen the grease pressure type up close.
I just picked up the same machine.
How well does it go up hills?
Does this engine have a low oil shut off?
How hot does the cowling get by your calf after running mine for about a hour it gets so hot it burns my calf!
I don't have enough time
on mine yet to have good answers for those questions. The only "hill" I've attempted was the ramp on the trailer. You can see how that turned out in the prior videos. The nature of the work I've done so far has all been about loading dirt into a trailer. It only takes a few minutes to fill up a trailer load, and I turn it off between loads. So, I have not had any significant heat issues yet. I'll go out and look for a low oil switch next chance I get and let you know if I find one. I don't recall seeing one, but have not specifically checked for it.
The nuts were a perfect fit for the track tensioners. I notice that your exhaust pipe is about 2 1/2" shorter then on my excavator. (My store bought extends to just about flush to the shroud.) I've also found a You Tube channel from AGT that has video of the hydraulic oil system/filter/change: www.youtube.com/@AGTIndustrial . So far no major differences between your auction model and my store bought save that my bolts and nuts all seemed tight and lube/greasing had been done before delivery.
Thanks for the feedback. So far, we have not heard from anyone who has one of these units that came with lock nuts on the track tensioners. They must have just overlooked that in the design. I need to put an extension on that exhaust pipe. I want it as long as possible without interfering with the hood movement, so it sounds like 2-1/2" is the number. Thanks!
It looks like you need to buy some thread gauges. it's hard to measure it with a micrometer.
It's probably just Chinese fine thread.
I got the job done with what I had to work with. Thanks for watching.
It would have taken 20 seconds to check it with the thread gauge instead of 6 minutes like it did on the video!
And you probably could have got those nuts at a hardware store instead of sending away for them.
You must love doing things the hard way.
My thread guage didn't go anywhere near 2.0mm and I live a long way from any hardware that would carry any metric nuts close to that size. Thanks for watching.