Same thing happened to my Kubota Z421. After third time Kubota said it was a defective spring design and gave me the new improved spring . So far has not broke or come off.
For the life of me, I could not get that darn spring back on. Then I saw your video and it went on like a charm on the first try. Thanks so much for the “spring on a string” trick. I just used the string that was already on a handle from my extendable pole pruner.
Thanks for the tip. Tensioner bolts came out (factory must have not tightened them) and messed up the belt with just 80 hours on the mower. Was struggling to get the spring back on. You gave me an idea and I was able to do it basically the same way with a battery cable screw eye. Went on without issues.
Thank you helped me alot because I don't know much about fixing things like this I have recently had to learn alot of things like this. Thanks again for your help
Thanks for the work sir! Needed this today. Was just mowing along, made a turn and…💩. Towed her back to my shop and saw your video. Went back to where it quit and bingo…there was the spring. 💪🏼👊🏼🇺🇸
Yes, you helped me! Sure enough, 48 hours on the mower, and i was riding along today and heard it break. Couldn't steer any more or accelerate. I'm sending this video to my husband. Dumb spring.
Mine broke at 33 hours. It was laying on the ground behind the mower. I had no idea where it went. The video was very useful. Thanks! Update...2nd one broke at 39 hours. Kubota has a problem.
Dem Thanks for the" String on the spring trick". I've be fighting this spring for 30 minutes without success and said OK it's time for TH-cam and found your post.
Just replaced the my spring ... with a two man operation , no need to jack up mower nor did we use a breaker bar ... my Son guided the spring in place while I pulled the tension with a nylon twine tied to one end of spring and the other one a piece of wood to help the old man out
Thanks so much for the video which helped to make replacing the spring easier. I have now done 80 hours and gone through 6 springs in 2 years. Kubota in Australia offer no assistance or answers and say I am the only one with this problem. Does anyone want to buy a second hand Kubota?
In terms of symptoms, do you hear a clunk and then all it can do is mow in place? It won't move forward or back and the arms feel very heavy when you try.
How many Inches is the belt? I have the same mower but my drive belt broke, and lucky not the spring. I need to buy a new belt but my local Kubota is closed on weekends
Good luck with that galvanized spring. I have a two year old Z421 and have broken four of those already. It is a terrible design and a weak idler arm. Good video though, I use similar methods in replacing the spring.
Kubota ended up replacing the galvanized spring with what I assume to be a steel spring (black) and that has helped some with the continuous breaking factor. They also replaced and redesigned the idler arm itself for increased strength but the spring kept slipping off the bushings and I have since burned up two transaxle fans because of it. Finally they installed oversize washers against the bushings to keep the spring from popping off but the belt still comes off the idler arm or left transaxle pulley about every other mowing cycle. It's in the shop now and Kubota is attempting to replace the bushings in the idler arm to try to correct a possible alignment issue. Parts have been on backorder for two weeks and they say it may be another two weeks before they arrive. It's been a nightmare. There are definitely issues with the belt drives on their Z421 series mowers.
Wow, wasn’t aware of this issue before buying my Z422 last fall. Just checked and my spring is black so I guess it’s the upgraded version, though it looks like those aren’t fool proof either. Guess I’ll keep an eye on it. Thanks
Same thing happened to my Kubota Z421. After third time Kubota said it was a defective spring design and gave me the new improved spring . So far has not broke or come off.
For the life of me, I could not get that darn spring back on. Then I saw your video and it went on like a charm on the first try. Thanks so much for the “spring on a string” trick. I just used the string that was already on a handle from my extendable pole pruner.
Thanks for the tip. Tensioner bolts came out (factory must have not tightened them) and messed up the belt with just 80 hours on the mower. Was struggling to get the spring back on. You gave me an idea and I was able to do it basically the same way with a battery cable screw eye. Went on without issues.
Thank you so much! This helped out so much. Mine just broke and it has 120hrs. Just a regular guy and this helped, thanks again!
Great video! Mine flew off and I couldn't figure out what direction the spring hooked up (blue end). Thanks again for posting!
Thank you helped me alot because I don't know much about fixing things like this I have recently had to learn alot of things like this.
Thanks again for your help
Thank you for the tutorial, I was clueless as a rock, but I got my machine back in service. Thanks again.
Thanks for the work sir! Needed this today. Was just mowing along, made a turn and…💩. Towed her back to my shop and saw your video. Went back to where it quit and bingo…there was the spring. 💪🏼👊🏼🇺🇸
Yes, you helped me! Sure enough, 48 hours on the mower, and i was riding along today and heard it break. Couldn't steer any more or accelerate. I'm sending this video to my husband. Dumb spring.
spring was kicking my butt til I watched this video, parachute cord worked great, thanks!
Mine broke at 33 hours. It was laying on the ground behind the mower. I had no idea where it went. The video was very useful. Thanks!
Update...2nd one broke at 39 hours. Kubota has a problem.
My Z781 just broke today at 39 hrs. Right in the middle of a job too.
Your video helped me a lot. I have different model but same sort of connection. The cord and handle idea was also handy. Thanks
Dem
Thanks for the" String on the spring trick". I've be fighting this spring for 30 minutes without success and said OK it's time for TH-cam and found your post.
Great tutorial, saved me service call and time.
Very helpful, thanks.
Thanks for the video.
Mine broke at 99 hrs.
I hooked a ratchet strap to the front of the frame ,and to the tension pulley arm,wont much trouble
Great video, thanks for taking time to show us,....
Thanks mate. Exactly what I needed. Well done.
This video was awesome! Just what we needed to fix our
You guys in the comment section , not knowing how do a simple task like this simply amazing,, just kinda use some brain cells like this guy did
Just replaced the my spring ... with a two man operation , no need to jack up mower nor did we use a breaker bar ... my Son guided the spring in place while I pulled the tension with a nylon twine tied to one end of spring and the other one a piece of wood to help the old man out
Nice ! ... mine just let go ... approx. Between 25 - 30 hour range . Did you have to loosen the pully or could it be done as is ???
Good idea and was very helpful.. will let u know how it goes
Doing today and you did it right. The belt is listed as 67 and 68 inches. 67 being way too much on spring.
I needed this thank you
Thanks so much for the video which helped to make replacing the spring easier. I have now done 80 hours and gone through 6 springs in 2 years. Kubota in Australia offer no assistance or answers and say I am the only one with this problem. Does anyone want to buy a second hand Kubota?
I used a dog tie out spring, it uses a compression spring for tension just made a couple "S"hooks to equal the original extension spring offset
Same problem I had thank you so much
Thanks. Fixing to replace mine.
Could you share the part number of the spring please? Thank you for the video. Part numbers would be the component to make it 100%
In terms of symptoms, do you hear a clunk and then all it can do is mow in place? It won't move forward or back and the arms feel very heavy when you try.
Much appreciated! Made for a quick fix!
Thanh you. I found the spring on the ground and wondered what the heck it went too.
Thanks this helps
How many Inches is the belt? I have the same mower but my drive belt broke, and lucky not the spring. I need to buy a new belt but my local Kubota is closed on weekends
Might as well get a spring to have on hand
How to you change the belt .. does the pully get loose 🤔 I feel mine is loose and wearing down my belt
Thx for the info, just broke mine @ 109 hrs, guess I'm goning to need a 6 pack of these 😪
Thanks for making!
Thanks now I know , I was lost !
THANK YOU 🙏
Thanks. Help me today
What is the part number for that spring?
Thanks
😊
Thank u
Good luck with that galvanized spring. I have a two year old Z421 and have broken four of those already. It is a terrible design and a weak idler arm. Good video though, I use similar methods in replacing the spring.
That engine sound in the background is not the Zero Turn, my tractor was running.
I have replaced two of these with only 50 hrs.
Kubota ended up replacing the galvanized spring with what I assume to be a steel spring (black) and that has helped some with the continuous breaking factor. They also replaced and redesigned the idler arm itself for increased strength but the spring kept slipping off the bushings and I have since burned up two transaxle fans because of it. Finally they installed oversize washers against the bushings to keep the spring from popping off but the belt still comes off the idler arm or left transaxle pulley about every other mowing cycle. It's in the shop now and Kubota is attempting to replace the bushings in the idler arm to try to correct a possible alignment issue. Parts have been on backorder for two weeks and they say it may be another two weeks before they arrive. It's been a nightmare. There are definitely issues with the belt drives on their Z421 series mowers.
Same amout of hours and mine just broke. Same machine... Thanks
Wow, wasn’t aware of this issue before buying my Z422 last fall. Just checked and my spring is black so I guess it’s the upgraded version, though it looks like those aren’t fool proof either. Guess I’ll keep an eye on it. Thanks