RTV500 HST Shifting

   / RTV500 HST Shifting #21  
I didn't go back through this thread to read if it had been mentioned, but have you removed your spark arrestor from the muffler? If it is clogged it would create the symptoms you describe. Forgive me if this has already been covered.
 
   / RTV500 HST Shifting #22  
High Gear in a RTV is strictly for flat, hard ground rolling. Some call it a highway gear. Even in soft dirt or mud, the machine should be put in " M ">>

Think sometimes that " H " was put there for folks who buy the machine to check the mail with >>>>>

We hardly ever use the high gear
 
   / RTV500 HST Shifting
  • Thread Starter
#23  
High Gear in a RTV is strictly for flat, hard ground rolling. Some call it a highway gear. Even in soft dirt or mud, the machine should be put in " M ">>

Think sometimes that " H " was put there for folks who buy the machine to check the mail with >>>>>

We hardly ever use the high gear

TWO GUNS, The 500 only has high and low...Wish it did have "M".

Just pulled the spark arrestor...Perfectly clean. Thanks for that suggestion though.

I'm with 737 on this. 450cc is not huge, but not that small either. This should have more power (not speed) than it does. Seems that the HST is not efficient in terms of power transfer. I'm sure it's more durable than a CVT and they do work great on diesels. On gas, not so much.

The 500 series Polaris will run circles around this thing. Wish it wasn't so.

I love the size, features and build of this thing, but come on Kubota!!

A dealer told me that there is a sport version of this coming. I just laughed at him.
 
   / RTV500 HST Shifting #24  
What I have noticed is Kubota is a tractor company. Thr RTV's are built from a tractor mentality, with features like HST transmission and hydrolic dumpand so on. For working and towing I have found nothing better, but I think Kubota will never build a RTV that will go fast, but it will get there and I can tow a ton while doing it.
 
   / RTV500 HST Shifting #25  
You DO NOT have to lift up on the pedal if the HST is set up correctly from pdi. On the Kubota hst your foot is not directly connected to the swashplate in the trans, it goes through a reaction valve first which senses hst pressure to tell the pump when to de stroke. Under full load, the engine should pull down a little, but not bog, and you definately do not have to back out of the throttle. The system was designed to take care of these types of issues, but it only will work as designed if set up right. It is an easy adjustment to make too.


so what constitutes a correctly setup HST? How do i tellif it is doing all that it can?
 
   / RTV500 HST Shifting #26  
I am a trained Kubota technitian and a heavy duty mechanic by trade, so I know the unit very well. The design of this hst is that it will "backshift" automatically when needed. This is the same thing that when you stab the pedal to the floor it does not bog the motor down and stall, just lugs a little and maintains it untill maximum speed is reached. This is just a simple adjustment on the hst unit for how aggressive the response is. If you push the pedal to the floor on a hst tractor suddenly, it will stall. You can do that on the rtv's because of the load sensing ability. In short, you know if your rtv is set up correctly if:

1. The motor only lugs a little and maintains it under hard acceleration, not bogging down or reving freely and loosing acceleration.
2. When the unit starts into a heavy load or up a hill, the unit should slow a little and gain in torque as the assist motor kicks in. After it has done this and is at maximum torque, it will start to pull the motor down (like an hst tractor pushing into a pile of dirt) and as the hydraulic pressure in the system rises, the load sensing piston will start to back off the swashplate angle. This in turn keeps the engine at full power and in its peak powerband, just like what a cvt system does. As the load comes off, or gets heavier, it will adjust to it.

If ANY of the rtv's do not do this for you, they are not adjusted properly.
 
   / RTV500 HST Shifting
  • Thread Starter
#27  
If ANY of the rtv's do not do this for you, they are not adjusted properly.

What is the proper adjustment method? Does it differ from what has been stated on this thread?
 
   / RTV500 HST Shifting #28  
I am new to this forum, so I do not know what others have suggested. On the transmission servo there is a small adjusting screw with a jam nut that when adjusted makes the hst more or less agressive. I need a picture to accurately point which one it is. Once you know what one, the further in or clockwise, the more agressive, or out and counterclockwise is less agressive. The servo is the rectangular black thing on the trans that has an arm attatched to it that moves with the throttle pedal to give you motion. Once you find it, there is a small screw with a slot in the end and a jam nut on the screw at the opposite end of the arm from the linkage. Once you find it, its really easy. From there, adjust it like I said before. It will take a bit of fine tuning, but it makes a night and day difference. If you need more in depth info let me know, maybee a phone call is in order?
 
   / RTV500 HST Shifting
  • Thread Starter
#29  
I am new to this forum, so I do not know what others have suggested. On the transmission servo there is a small adjusting screw with a jam nut that when adjusted makes the hst more or less agressive. I need a picture to accurately point which one it is. Once you know what one, the further in or clockwise, the more agressive, or out and counterclockwise is less agressive. The servo is the rectangular black thing on the trans that has an arm attatched to it that moves with the throttle pedal to give you motion. Once you find it, there is a small screw with a slot in the end and a jam nut on the screw at the opposite end of the arm from the linkage. Once you find it, its really easy. From there, adjust it like I said before. It will take a bit of fine tuning, but it makes a night and day difference. If you need more in depth info let me know, maybee a phone call is in order?

Thanks...I'll see if I can find it...Will let you know.
 
   / RTV500 HST Shifting
  • Thread Starter
#30  
Once you find it, its really easy. From there, adjust it like I said before. It will take a bit of fine tuning, but it makes a night and day difference. If you need more in depth info let me know, maybee a phone call is in order?

The only screw and jamb nut I see is on the silver part of the servo, and it's an allen screw. Doesn't sound like the correct on based on your description. I dont see anything on or near the servo rod.

Do you have a graphic description of this adjustment?

What does a more aggressive shift do? Your opinion as there are many ways to define this.

Is there any possiblity of tranny damage from doing adjustment?

If I mash it, it just runs out of RPM's on hills until I let up on the pedal to cause the downshift, sometimes there isn't much pedal left to release once I get to the top of the hill. It's very annoying and honestly embarassing for something this expensive.

There are those who say this is normal, your thoughts?
 

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