RTV900 Issues

   / RTV900 Issues #1  

drtwpmd

New member
Joined
Apr 1, 2009
Messages
12
Location
Michigan
Tractor
Kubota L4740 HSTC-1
As a new Kubota owner (L4740 HSTC-1 w/loader, HD bucket, cutting edge, worklights, loaded R-4's + RTV900 worksite w/soft cab) of less than 1 week, I feel I've made the right decision. Got what I feel is a pretty good deal ($31,500 for the tractor, $12,500 for the utility vehicle), but my RTV broke with only 2 hrs on the clock. I was allowing my wife to get acquainted with the machine, since she will be using it for transport to the horse barn/arena, when it suddenly gave up the ghost and wouldn't budge. We were in the back 20 acres when she coasted to a stop. Upon stepping on the gas again, engine revs up - but no forward motion. She immediately turned to me with a "But I didn't do anything!" look, and since I was sitting right beside her, I had absolve her of any guilt.

After reacquiring my favored position behind the wheel, and trying multiple shift ranges, 2 vs 4 wheel drive, etc., I came to the conclusion I was looking at a machine stuck in the field with 2.1 hr on the Hobbs. The power steering and hydraulic dump worked, so figured the hydrostat drive was generating fluid pressure or the PS wouldn't work. The engine revs appropriately when the pedal is pressed, and the little beast SEEMS to want to go with an initial creep forward when revved, but then stops. Also, I was able to push the machine back and forth 4-5 feet in neutral, so assumed the brakes hadn't locked up. After speaking with my dealer (100 mi away) and hearing that the 900 in their experience is bulletproof, and offering no ready solution, I received the OK to tow it up to the house with the pickup.

The dealer, fortunately, sent a mechanic to look at the unit 2 days ago with another new RTV in tow to scavenge for parts if needed. He and I played with this and that for 1-2 hrs adjusting brakes and gear linkage assemblies, including removing the linkage arm cover on the top of the transmission to make sure it was engaging, but everything was in order and no success. Calls to Kubota engineering were relatively fruitless. We ultimately decided it needed a proper operating room and winched it up onto the trailer - and away it went.

I haven't heard back from the dealer, so assuming it's more than a simple fix. The questions I have for you good folk are:

1) Anybody experienced anything similar to this with an RTV? Everybody I've spoken to at the dealer seems befuddled.

2) Do you think this portends a lifetime of misery with this machine? The RTV series carries a 1 yr warranty as I understand it, and visions of major repair issues at 14 months keep dancing in my head.

3) At what point should I suggest (to the dealer? Kubota?) maybe we should swap out this machine for a different one? If they have to replace major mechanical parts (ie transmission), should this be construed a good thing that the present (and future?) problem(s) are fixed, or a bad thing?

4) I noticed in going over the machine that my particular unit was produced in Oct, 2007 (if the sticker is correct). Could a long time sitting on the lot lead to significant mechanical issues in the future? Also, were any major improvements in the RTV series implemented from then to now? I can understand moving out your old stock, but I must admit I assumed the machine would probably have been produced in 2008.

So far I'm satisfied with the response/actions from the dealer. They've been in business for 70+ yrs and did the honorable thing by sending a mechanic and trailer 100+ mi one way to fix &/or transport the machine. That said, I spent over $50,000 on the Kubota's and a Gravely ZTR mower at their dealership, so I guess I expect a little favored nation treatment. Also, I'm a firm believer in the buyer beware theory of business and work on the assumption that nobody looks out for me like me.

Thanks for any input from you experienced Kubota devotees and think I'll fire up the 4740 this morning for a little tree mashing. If it breaks, I'll be back.
 
   / RTV900 Issues #2  
I would definitely get the transmission swapped out, or a really good walk through of what failed and how they replaced all of it.

The 900 is a great machine, but the shifting sucks -- 100%.

I often find myself trying to go from L to R and having to stop, gas the machine, wiggle the 2WD to 4WD -- just to get it to shift -- and it eventually does. I baby the machine though, and never force or grind.

The times this is a real PITA when you're in a tight spot, and you just can't shift the lovely machine out of gear -- it's a bit embarrassing.

Also, it makes you never want to have others borrow it, for fear that they'll just jam the shifting when it doesn't immediately work, making your trans. junk.

What I really love is my b2400's true hydro, with a front foot forward, heel reverse pedal -- it's bullet-proof, and it makes going in reverse a joy.

The 900 is a great machine, but it seems like nobody really test drove them before producing 100,000 of them --

:|
 
   / RTV900 Issues #3  
:)The magic of shifting an RTV900 is 'Wait 10 Seconds while you hold your foot firmly on the brake'. The RTV is a hydro transmission, tied to a slidding gear transmission. You have to give the hydro 10 seconds to unload then it shifts like any other transmission. The gear transmission is trying to hold the machine in place. You have to transfer the load to the brakes before you can shift it. 100% fix for RTV shifting.
 
   / RTV900 Issues #4  
Get a 2009 model. It has a VHT Plus transmission which has less dynamic brake and less sticking when shifting due to a pressure relief system built into the brake pedal- no more pulling a knob on the dash panel to release the pressure.
 
   / RTV900 Issues #5  
Get a 2009 model. It has a VHT Plus transmission which has less dynamic brake and less sticking when shifting due to a pressure relief system built into the brake pedal- no more pulling a knob on the dash panel to release the pressure.

Those are not shipping yet.

I'd not worry about it, most RTV transmission issues are fixed pretty easily. I'd guess its a pretty common problem we run into with the shift linkage.
 
   / RTV900 Issues #6  
Thanks for any input from you experienced Kubota devotees and think I'll fire up the 4740 this morning for a little tree mashing. If it breaks, I'll be back.


I guess we won't hear from you then? :)

Ahh, do keep us posted. I never had mine not move before. It was one of the first batches produced. Shifting became easier over time. I am sure the dealer will figure it out.

Sounds like you have a nice setup.
 
   / RTV900 Issues
  • Thread Starter
#7  
Update on the RTV

Received the unit back yesterday from the dealer. To their credit, they picked up, fixed, and returned the unit 108 mi each way without a squawk.

Apparently, the problem arose from the shift assist pump (?) located at the very back of the transmission. According to the mechanic who dropped off my machine, the dealership adjusted all linkages to tolerances without effect. They then called in the wandering Kubota mechanic who diagnosed the problem with the pump. It sounds like there is some kind of hydraulically actuated pressure plate which engages a linkage assembly to assist with shifting. Upon removing the six bolts holding the cover on, they discovered the linkage arm had disconnected and was lying at the bottom of the pan. The rep reportedly took numerous pictures to forward on to the factory in Japan.

After reassembling the linkage using loctite, they replaced the cover and problem fixed. I questioned them if there was any long term sequelae from this little event, to which they replied no. Hope so, and guess I'll find out. The rep told the dealership he had seen this problem once before in another RTV.

Anyway, machine is back and everything appears in order. My wife and niece took turns driving it around the back 40 yesterday - no problems. Except that shifting, both L-M-H and 2WD-4WD, is sometimes cantankerous. But I guess that's an inherent trait of the machine as it currently exists. Otherwise, I'm looking forward to using it this summer extensively and for many years to come.

Thanks for all of the replies, and incidentally no problems with the 4740 thus far. It appears to be a real workhorse.
 
   / RTV900 Issues #9  
there is a fix to the shifting on the RTV900's have your dealer adjust the valve in the transmission we did it to ours and you get some more free wheeling before the transmission's back pressure kicks in and that is about half of what it was. It was definitely worth it.
 
   / RTV900 Issues #10  
:)The magic of shifting an RTV900 is 'Wait 10 Seconds while you hold your foot firmly on the brake'. The RTV is a hydro transmission, tied to a slidding gear transmission. You have to give the hydro 10 seconds to unload then it shifts like any other transmission. The gear transmission is trying to hold the machine in place. You have to transfer the load to the brakes before you can shift it. 100% fix for RTV shifting.

I've mentioned it in other threads, but installing a 'coast' valve was the best thing I ever did to my RTV. My dealer strongly advised me against tampering with the spring on the factory coast valve and said that their RTV tech had attended a Kubota training meeting where the pointed out that tampering with the spring on the factory valve could easily cause cavitation and ruin the transmission. I asked him about the solid, no spring, replacement valve I bought and he didn't believe it would cause the same cavitation problem because it had no spring to allow variances. All I know is my RTV drives great, there is no 'learning curve' to operating it, and my shifting issues disappeared including the need to wait 10 seconds (which annoyed the heck out of me). I haven't used the release valve but once since installing the coast valve and that was when I had the machine in a bind in a rut.

Having said that, my RTV900 became easier to shift the more I worked it. By the time I traded it on an RTV1100 it ran much better and shifted much better than when it was new. I firmly believe there is a break in period for these machines.
 

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