Kubota BX25 has weak HST power

[check]

Hello, guys, my 2009 Kubota BX25 seems to have lost a LOT of power to drive up even a slight incline, especially in reverse. For example, I was back dragging some very light, sandy soil up a VERY gentle slope, and even in Low (turtle) the tractor simply could not handle it. (And even when I lifted the FEL right off the ground, the tractor was barely moving.) Also, when driving forward in high with the HST pedal all the way down on a flat road, I don't seem to get the same speed I used to get.

Any ideas what is wrong?

Thanks,

James

 

[JK22]

Try this. Kubota BX Tech Tip (Slow Tractor)? - YouTube

 

[wawajake]

That video was very interesting, thanks !!! I also find that the forward reverse pedal (when you lift the rubber carpet around the unit you will see there is a spring pin that can work its way out that joins the pedal to the shaft, I find when I see I am losing power , I lift the carpet and drive the spring pin back in with a nail punch and hammer ( two minute job) and it is back to normal for a month or more (still haven't figured a solution on how to keep that spring pin in better (its about quarter inch diameter and sometimes an inch sticking out)

 

[JK22]

That video was very interesting, thanks !!! I also find that the forward reverse pedal (when you lift the rubber carpet around the unit you will see there is a spring pin that can work its way out that joins the pedal to the shaft, I find when I see I am losing power , I lift the carpet and drive the spring pin back in with a nail punch and hammer ( two minute job) and it is back to normal for a month or more (still haven't figured a solution on how to keep that spring pin in better (its about quarter inch diameter and sometimes an inch sticking out)

You are welcome. Paul Short has numerous helpful and insightful videos. I suggest you subscribe to him. He has a lot to teach! I'll have to take a look at that spring pin. Sounds like it might need to be replaced or maybe just degreased? I know that it's common in firearms for those spring pins/roll pins to get worn down and need replacement.

 

[zoltanthegypsy]

Now I've got to go check that linkage too. Tractor is moving fine, but still merits a check. Thanks!

One more possibility that happened to me. Sudden loss of full speed forward. Small pebble had somehow ended up against the pedal pivot under the pedal and was blocking full travel. Checked everything and all was connected as it should be. Just about gave up - then spotted the pebble.

FWIW,
Z.

 

[AStanton]

I would recommend that you check all you hydraulic hoses. I had a back hoe hose rubbing on the frame and it finally sprung a leak. This is the only complaint I would ever have against my dealer, as the tractor came new from there to me.

 

[check]

All great ideas, guys! Will check them all out this weekend.

 

[timswi]

Check the condition of your air/fuel filters too--Had that happen on my BX23 and the air filter was clogged from moving a tri-axle load of dusty limestone--Just a suggestion.

 

[Tractor Seabee]

I was bumming with my dealer's shop foreman awhile back and we were discussing common HST problems. He said that a very common problem is folks wipe out the HST cooling fan and do not realize it till other problems crop up like yours. He said on a hot day under loads like brush hogging the HST fluid gets way too hot (over 210 degrees) for too long and parts start to wear and break down. It is an expensive rebuild of the HST as a lot of parts get affected and some replaced for insurance. I've heard KTAC will pay the freight if you can tie the too together and indicate a casualty type situation that destroyed the fan. Worth checking. He also said HST fluid changes color under heat stress; good indicator of heat as nothing else contaminates it unless introduced from outside. I am looking at a way to get a temp probe into the HST, any anybody done that?.


Ron

 

[check]

Ok, it looks like Paul Short was right. It is a missing nut on the linkage from the HST go pedal. The nut is a 5/16" machine thread, so I just need to pick one up and put it on, either with the nylon thread lock, or some goop, or one of those flange nuts that comes with its own Version of a lockwasher.

Will have to remove the Bro-Tek skid plates in order to get proper access. No problem, they are just bolt on..

 

[dodge man]

This is a real long shot but I had a similar problem. My tractor just wouldn't pull a hill. My rear tires were under inflated. They are fluid filled and hard to check. They didn't look low but they were so under inflated the rim was spinning inside the rim.

 

[David_Kb7uns]

Double check the 5/16 thread, I would think the nut is Metric.

David

 

[check]

He scores! Paul Short was right in his Youtube posting. It was this piddly little nut deep in the frame of the tractor, almost inaccessible, that had come off. It joined one piece of the go pedal linkage to another piece, and, with the nut off, there was slack in the system, meaning that the go pedal force on your foot was not all being translated directly to the HST mechanism. So, it was like you had just pushed the go pedal down a little bit instead of however much you actually did push it down.

Anyway, I had to remove the Bro-Tek skid plates in order to get access, and then I couldn't believe it, but I was able to reach up and put the new nut on and lock washer with my big hands and big fingers, after about 20 or 30 or 40 tries. Now Paul had exactly the same problem, and I have no idea how he figured it out, but he said that it would be difficult to get that nut on and I was very inspired by the fact that he also said "I did it, and if I can do it, you can do it." If it was not for that statement I would've given up after 30 tries or so, but I kept thinking about what he said, and after many, many tries, and much to my surprise, I finally got the nut on!

Another great example of how we support and inspire each other here on TBN.

After I had installed the washer and nut, and then bolted my skid plate back on, I went for a little ride, and it was so nice to see the tractor booting along much faster than it did before. Also the reverse had all the power in the world, and it was the tractor that I had originally purchased all over again.

A big relief, and it saved me both time and money because I did not have to take it to the dealer.

Now I have to sit back and watch the sunset here at the lake, and say to myself "life is good".

Thanks again, Paul, and best of luck on your recovery! You have certainly made a difference in my tractor life, and I hope that you continue to do so!

James
(A fellow "Canuck" from Ontario)

 

[amigauser]

Excellent, glad you were able to resolve it quickly. That is on big benefit of TBN, the shared knowledge

 

[4shorts]

He scores! Paul Short was right in his Youtube posting. It was this piddly little nut deep in the frame of the tractor, almost inaccessible, that had come off. It joined one piece of the go pedal linkage to another piece, and, with the nut off, there was slack in the system, meaning that the go pedal force on your foot was not all being translated directly to the HST mechanism. So, it was like you had just pushed the go pedal down a little bit instead of however much you actually did push it down.

Anyway, I had to remove the Bro-Tek skid plates in order to get access, and then I couldn't believe it, but I was able to reach up and put the new nut on and lock washer with my big hands and big fingers, after about 20 or 30 or 40 tries. Now Paul had exactly the same problem, and I have no idea how he figured it out, but he said that it would be difficult to get that nut on and I was very inspired by the fact that he also said "I did it, and if I can do it, you can do it." If it was not for that statement I would've given up after 30 tries or so, but I kept thinking about what he said, and after many, many tries, and much to my surprise, I finally got the nut on!

Another great example of how we support and inspire each other here on TBN.

After I had installed the washer and nut, and then bolted my skid plate back on, I went for a little ride, and it was so nice to see the tractor booting along much faster than it did before. Also the reverse had all the power in the world, and it was the tractor that I had originally purchased all over again.

A big relief, and it saved me both time and money because I did not have to take it to the dealer.

Now I have to sit back and watch the sunset here at the lake, and say to myself "life is good".

Thanks again, Paul, and best of luck on your recovery! You have certainly made a difference in my tractor life, and I hope that you continue to do so!

James
(A fellow "Canuck" from Ontario)

Glad it worked out for you James. I appreciate the mention. It's so rewarding when we can solve our own tractor repairs and not have to take the machine out to the dealer. Proud of you for getting it done :laughing:
Good stuff.

 

[shellfishlady]

Looking for a cross reference for oil filter and transmission filter. Our Kubota dealer is a 90 mile round trip!
Have a new BX25DLB and hit the 50 change already.
Thanks for any help.

 

[SLIMSHADIE]

Here you go, this guy has sold 410 of these! Its always nice to have a spare set of filters, wether its fuel filters in the winter at -20, dont ask? or in your case 90 miles to dealer...you are looking for part # 77700-03362 and it says it is.


KUBOTA OEM BX FILTER MAINTENANCE KIT BX24 BX25 BX223 BX235 BX236 BX237 | eBay