Is it possible to rebuild a HST damper?

   / Is it possible to rebuild a HST damper?
  • Thread Starter
#21  
4lane,
Not sure how difficult it is to access the two different dampeners but if possible can you disconnect one and operate them to see if they return to home position repeatedly. I suspect that one of them is more like a gas strut and will not return very well and the other should repeat position.

My old Kubota BX 1850 had a strut that looks very similar to your item 31. It did nothing for position, it strictly controlled return to neutral speed of the spring linkage assembly.

Other thing not easily done is to try and measure how much movement is required to go from creeping forward to reverse. This will provide some estimate of required repeatable accuracy of the centering mechanism. I suspect that it is not much travel.

Both the damper and spring are easily accessible. I think my next step is to remove the damper from the equation since (I believe) it's sole purpose is to control the return rate of the spring. This way I can see if the spring alone brings it to neutral on it's on any better or not. At least it will give me a next step. the movement needed to eliminate the creeping is pretty minimal so here's hoping I can identify an improvement between the damper/spring.
 
   / Is it possible to rebuild a HST damper? #22  
Sounds like you are approaching this in a very methodical manner so confident you will find the root cause.

Just throwing out ideas or things to consider.

Is there a chance moisture, dirt got into that spring damper assembly and could be causing some extra friction from corrosion? May not take much to effect its ability to return home.

Best of luck on the search for the problem
 
   / Is it possible to rebuild a HST damper? #23  
Both the damper and spring are easily accessible. I think my next step is to remove the damper from the equation since (I believe) it's sole purpose is to control the return rate of the spring. This way I can see if the spring alone brings it to neutral on it's on any better or not. At least it will give me a next step. the movement needed to eliminate the creeping is pretty minimal so here's hoping I can identify an improvement between the damper/spring.

I’ve been watching this thread and wondering this very thing. It’s an easy test and will likely get you back to neutral. But I suspect it’s going to stop suddenly....like wear your seatbelt and hold on to the dentures fast!
 
   / Is it possible to rebuild a HST damper?
  • Thread Starter
#24  
I致e been watching this thread and wondering this very thing. It痴 an easy test and will likely get you back to neutral. But I suspect it痴 going to stop suddenly....like wear your seatbelt and hold on to the dentures fast!

This specific Kioti issue has, in some cases, been diagnosed as a transmission issue, in other cases the damper was blamed. I never saw any firm resolution one way or the other: as we have seen in this thread. Anyway, this is my only option so it is worth a shot.
 
   / Is it possible to rebuild a HST damper? #25  
If it turns out to be the dampener they make generic ones that may be less than the dealer. Maybe some more hassle though
 
   / Is it possible to rebuild a HST damper?
  • Thread Starter
#26  
If it turns out to be the dampener they make generic ones that may be less than the dealer. Maybe some more hassle though

Right. Oldnslo pointed out that you can get internal parts for the damper, so it appears that it is not a gas shock, but spring loaded, and it痴 rebuildable so I would not have to buy the whole thing.
 
   / Is it possible to rebuild a HST damper? #27  
4lane
I suspect that Kioti has a description (translation) error on the two dampeners. I believe the one that has all the springs and appears rebuildable is the centering spring assembly while the other item is a sealed gas strut that is actually dampening or controlling the rate that the spring returns to center.

This why I asked if you could access these two items to confirm one is a spring assembly that just wants to return to a given position quickly while the other is more like a shock absorber and restricts movement
 
   / Is it possible to rebuild a HST damper?
  • Thread Starter
#28  
Cold weather has broken and I've finally had a chance to dig into this further by taking apart the assembly. The spring is actually just a gas damper, and the other one is just centering and controlling the rate of return. The centering damper seemed to act just normal.

However, the little gas damper acted quite odd and I'm not sure it's working properly. After you compress it, I would expect it to extend out on it's own like a normal gas damper, but it doesn't. Seems dead to me.

Here's a video of the gas damper after I've taken it out to test it. What do you think?

 
Last edited:
   / Is it possible to rebuild a HST damper?
  • Thread Starter
#29  
And here is a video of the whole unit in action:

 
   / Is it possible to rebuild a HST damper? #30  
I don't think you can rebuilt it , They have oil and pressure in them ...
 

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