Why?

M

Mr. Green

New member
<FONT face="Courier New" color=#ffffff><FONT face=Arial color=#000000>I, apparently like most here, also find the RTV900 noise levelcoupled with the highidle speed somewhat annoying. I have read and researched past threads on fast idle speeds and I am tempted to adjust the idle to a lower speed as described.</FONT></FONT></P>


<FONT face=Arial>Certainly we must assumeKubota engineered/designed these units to have the rather fast idle that they are all born with. </FONT></P>


<FONT face=Arial>Why then? What is their reasoning behind the high idle speed. There must be an explanation for this and I would like to find out what it is before I reduce the idle speed on my "beast". I assume it must have something to do with the hydrostatic transmission operation at "idle", but don't really have a clue.</FONT></P>


<FONT face=Arial>Does anyone have any insight on this?</FONT></P>


<FONT face=Arial>Thanks..........</FONT></P>


<FONT face=Arial>Mr. G.</FONT></P>


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Other than the diesel rattling more at idle, I can't think of any reason. Some units with too high of an idle can actually put some pressure on the transmission and make it hard to shift.
 
I can see it now, everyone who reads these post are going to get paranoid, thinking their idle is to high. But the point where Messick Farm Equipment wrote stands true. If your RTV is really, reallyhard to shift, ( at a idle), it might be idled to high, but on the other hand, if your transmission goes in gear faily well, then it should be idled at the manufactured setting. But I would bet anyone, that they check these units before they leave the Kubota factory to the dealers >>>>>>> [H]
 
Setting the idle "high" helps reduce noise/vibration inherit with small diesel engines. Idle RPM should not adversely effect shifting...that is primarily dictated by the HST's neutral setting. I think the factory idle setting is 1,200 RPM (I'll try to confirm that later).
 
I can completely remove the idle adjusting screw with no change in idle rpm. Too bad Kubota chose to have a useless speedometer instead of a tachometer. They probably had their reason! I personally am more concerned with the flimsy (micky mouse) front drive shaft.</P>
 
[quote user="Jiles"]

I can completely remove the idle adjusting screw with no change in idle rpm. Too bad Kubota chose to have a useless speedometer instead of a tachometer. They probably had their reason! I personally am more concerned with the flimsy (micky mouse) front drive shaft.</p>[/quote]

Does any UV come with a tachometer? I don't think so. That's odd that removing the idle adjusting screw had no change. Well, the front drive shaft may look "mickey mouse" but it gets the job done.
 
Jiles </P>


Got to make a statement on the " Mickey Mouse " front drive shaft. Don't let the size of the shaft fool you.... For, a matter of fact, it has the same size front shaft on the RTV, that a oil field winch truckhason it's PTO, that runs a Tulsa Winch pulling a 1-1/2 inch steel cable line that pulls over 60,000 - 80,000 lbs. of steel up & over a rolling tailboad of a oil-field trailer. I know the winch is geared low for the jobs, but I figure if a small " Mickey Mouse " shaft can run a big winch like this. The shaft Kubota has will turn the front end of any RTV with no problem. It's all in the gearing . So don't be fooled by this. I haveowned & run these trucks before with winches and the winch & cables would go out before the shaft. Designers of these types of equipment has DONE figured all of this out before they ever go into production. So giveyour RTV your best shot, it will take it !!!!!![Y]</P>


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By saying, (micky mouse), I am referring to the sloppy yoke fit. There is no excuse for this in a machine of this quality design! From reading on this forum, it is suggestive that Kubota can't get it right.I will make my own changes to the yokes with the set screws as indicated somewhere on this sight, and eliminate the rattle. ALL MACHINES have their design flaws and just because I own one doesn't mean I overlook defects. Other then : (1) Drive shaft rattle (2) Gas cap design (3) Spindle stops (4) High idle ,the Kubota is a fantastic machine. I still feel that it is far superior in quality then any other machine that I considered buying. Just a few things that should have been addressed before 2006.
 
[quote user="Jiles"]By saying, (micky mouse), I am referring to the sloppy yoke fit. There is no excuse for this in a machine of this quality design! From reading on this forum, it is suggestive that Kubota can't get it right.I will make my own changes to the yokes with the set screws as indicated somewhere on this sight, and eliminate the rattle. ALL MACHINES have their design flaws and just because I own one doesn't mean I overlook defects. Other then : (1) Drive shaft rattle (2) Gas cap design (3) Spindle stops (4) High idle ,the Kubota is a fantastic machine. I still feel that it is far superior in quality then any other machine that I considered buying. Just a few things that should have been addressed before 2006.[/quote]

True, the RTV900 is not perfect and you were not specific as to the problem with the front drive shaft. Problems 1-3 listed have been addressed with a fix, change or kit (see your local dealer or PM me). Problem 4 is not a problem that I know of or at least something that should be easy to adjust/fix. Lastly, these things were found before 2006 but you need time to test and verify changes/fixes will get the job done right and not create other problems...etc.
 
As you suggested, I have seen the dealer. My Kubota is a 2006 and has all the problems I mentioned. The fuel tank and cap were replaced--very little improvement. The front yokes were replaced and the noise went away--for a while. As I stated in my original post, the idle screw on MY MACHINE has nothing to do with lowering the idle. The lever on the injection pump will just move, free travel, until it reaches the point where the screw originally had it located. Then the rpm increase. Yes I adjusted the correct screw. I have worked on many injection pumps and have come to the conclusion that the idle is controlled internally within the injection pump. This would not be a simple fix.I have not has problems with the spindle stops but will make the proper update. As in all cases, my Kubota may be different from what you have experienced. Maby I need to find another dealer.
 
The fuel tank assembly fix is a fairly recent development...the Rev.5 version of it fixes this problem. The front drive shaft has a kit to prevent said noise problem. I will have to double check the idle deal i.e. ask my sources what to do there. Yeah, get your dealer to contact the Kubota tech line if they don't know how to fix the fuel tank or front drive shaft issues and they should be able to help with the idle situation as well.
 
Jippy said it all !!!! [;)]</P>


Wouldn't it be just right to get the Kubota dealer to check the idle speed . THEN , if it needs adjustment, let him set it to the factory standards. For jacking around with a pump, could run a owner into something he might wish he'd never stepped into >>>>>></P>
 
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