DK40SE Squeal When Moving in Reverse.

[kattywumpus]

I have a new DK40SE. After 30 minute of use the tractor started generating a very loud squeal when moving in reverse. The squeal sound like a brake sticking. The engine was running at the recommend RPM for HST if not higher. The HST was in low range. I was using a 6' angle blade to grade a driveway. Once the tractor was moving in reverse the sound would start. When I hit the brakes the sound might stop or might not, but the minute I hit the forward petal it would stop. I'm sure the dealer will fix it, but I'm wonder what the cause is.

 

[art]

It could be a hydro relief valve problem as you said the brakes didn't make any difference.

 

[kattywumpus]

I was thinking the same thing. One change to the description of the problem it appears it really takes 1 1/2 hours to 2 hours of steady use before the noise occur.

 

[Highbeam]

Is it a chatter like a chirp chirp chirp or is a steady squeal like a waaaaaaaaaaaa?

I'll get some odd chirp sounds in reverse sometimes. Chirp hear a chirp there. Goes away when the clutch pedal is depressed just enough to take up the slack which tells me it's the throwout bearing.

Try setting your foot on the clutch pedal while the noise is going.

 

[Johnjudge007]

my tractor makes a squealing sound in both directions but only under strain

 

[roger 4400]

Try to adjust your brake pedal a little bit lower. My new MF 1643 HST was slowing and loosing rpm instead of increasing after 2 hours of mowing (HST oil hot). Dealer came home adjusted the pedal lower and since then no problem.. When hst oil is too hot the brake pads that are in the oil are expanding because of the heat and slow the tractor, making the hst under more stress . Good luck. Roger

 

[MichiganIron]

Sounds like HST Relief valve. Contact your dealer.

 

[kattywumpus]

Highbeam, I think the sound depend on how long the tractor been running. Initially after an 1 1/2 hours of use its a random or odd chirp sounds in reverse. And when either HST forward or reverse pedals are released a quick steady squeal occurs until the tractor stops. After around 3 hours of use when the tractor is placed in reverse the sound is more steady and very loud. My wife can hear it in the house. At that point I shutdown the tractor and let it cool down.

Roger, it does sound so much like a brake squeal and it does seem like the brake pedals are tight. I really have to push really hard to engage the parking brake, so you maybe on to something.

So far the dealer hasn't been much help. His response was I was not running the tractor at the correct RPMs. When I would go in reverse I would drop the RPMs to 2500 RPM were the red triangle is on the gauge. I did this because I was backing down a long driveway without a load on the tractor. When I graded forward I would increase the RPMs to 2900. The dealer had told me for best HST performance the RPMs should be at the red triangle (2500 RPM) or above. But the manual say 2600 RPM, so his answer was I should running it at 2600+ instead 2500. I doubt very much an extra 100 RPM will resolve the issue since the problem seem to be temperature related. Once the tractor cools down the noise does not occur for another 1 1/2 to 2 hours. But I will give his suggestion a try.

Thanks

 

[Highbeam]

I do plenty of HST work with RPMs WAY WAY below the red triangle. I like burbling along at 2000 for lots of work and while it may not be the "best" performance I can assure you that it works just fine. You could say the same thing about gear tractors, that for the "best" performance the engine should be at peak HP or torque RPM but we all know that the rest of the RPM range makes power too.

Try touching the clutch pedal when it is squealing to take up the slack in the clutch mechanism. Just to see. It doesn't cost anything.

Do you have a hydro cooler on that model? If you notice a direct relationship between heating the machine up and the noise then the fluid may be getting hot, thinning out, and bypassing a relief. When it is hot enough to squeal, open the hood and put your hand on the hydro cooler and see if it is hot. On my CK I have a hydro filter behind my right foot that I can feel with my hand from the operator's seat to dense if the hydro fluid is too hot.

 

[MichiganIron]

As the tractor warms and the hydraulic fluid gets warm, the pressure relief in the hydrostat could open prematurely. This will normally happen under load, like the brakes were stuck.

If you hear the squeal, and you are sure the brakes are released, we would look to the HST pressure relief next. The squeal would come from the middle of the transmission case.

Put the range selector in NUETRAL !!!, then try to rock the tractor gently. You'll be are to tell if the brakes are locked.

 

[Johnjudge007]

just spoke to Kioti about my new DK55 tractor. been calling about a sqeeling sound during streess on tractor, was told that its the air to the turbo, possible bad connection, not designed with alot of room on the intake side, great brand new machine with less than 14 hours on it and I'm to start wrenching on the engine....starting to think I got a lemon!!

 

[Hawghauler]

just spoke to Kioti about my new DK55 tractor. been calling about a sqeeling sound during streess on tractor, was told that its the air to the turbo, possible bad connection, not designed with alot of room on the intake side, great brand new machine with less than 14 hours on it and I'm to start wrenching on the engine....starting to think I got a lemon!!

Most mechanical devices will have any of the manufacturing/assembly issues manifest fairly early on. Use the warranty, that is what it is for. I wouldn't throw in the towel just yet. Even Rolex has repair centers for new watches.

 

[kattywumpus]

I'm still pushing the dealer to get this resolved. I attached a video showing the RPMs and direction of the tractor. You can clearly hear the squeal. The video starts with the sound occuring. When I push the forward pedal the squeal goes away. When the reverse pedal is pushed the sound starts again. When I release the reverse pedal the squeal may continue to occur until the forward petal is pushed. There is no load on the tractor.

I have not troubleshooted the problem yet, I focused on getting a good video to send to the dealer.

Video Link: http://www.youtube.com/watch?v=yazhoO3ohvQ

DBB

 

[LaVoie Equipment]

Katty - Don't push the dealer, TAKE it and let THEM repair it. Warranty is there for a reason and here is the opportunity to use it.

I have sold many of this series of tractor. We OWN one. The DK40SE Cab tractor is one of the nicest tractors you can buy. Let your dealer repair it and you to will be impressed.

Tony

 

[kattywumpus]

Tony,
Please understand my point of view, as a customer that just spend a lot money I expect the problem to be resolved in a timely matter with good communication without making me jump through a lot of loops. Good communication being the most important. Good communication can reduce the uncertainty the customer maybe feeling. I really don't think this is too much to ask. As far as the warranty goes it is only as good as the vendor and company that stands behind it. This creates uncertainty for me since I have no experience with this dealer and the company. If this was a new car or truck I can guarantee you it would have been returned by now, period, no ifs ands or buts. I think I'm being very patient. Part of reason I'm being patient is communication in this forum including your's.

It seem now days businesses easily forgot to put themselves in their customers' shoes.


--------------------------------------------------------------------------------

Katty - Don't push the dealer, TAKE it and let THEM repair it. Warranty is there for a reason and here is the opportunity to use it.

I have sold many of this series of tractor. We OWN one. The DK40SE Cab tractor is one of the nicest tractors you can buy. Let your dealer repair it and you to will be impressed.

Tony
__________________
J A LaVoie Equipment Sales, Inc.
Virginia KIOTI Tractor, Woods Equipment, Carmate & Cam Trailers, CID Attachments Dealer: New, Used, Service, Parts

LaVoie Equipment

 

[kattywumpus]

I received an update from my dealer. Kioti has seen the video and stated the problem is a hydraulic sound resonance issue. They are aware of the issue and are working on a fix. They also stated the sound will not effect the tractor operation or longevity. I have not seen it affect the tractor performance. They promised a solution is forthcoming. I am glad to hear Kioti realizes there is a problem and is working on it. Hopefully Kioti will keep the owners affected by this problem updated.

If this problem can be resolved I will be very happy with this tractor.

 

[dourobob]

Interesting to hear that Kioti knows about this problem and is developing a solution.

I have a DK45SE HST and noticed it squealing in reverse yesterday but not so much today. Is the noise sporadic?

Bob

 

[chasemech]

kattywumpus I know you said the tractor was new what year is it, 2009 or 2010.
I have a 2009 about 1 year old and do not hear that noise in forward or reverse through all ranges of rpm. Either way would be interested in the outcome keep us posted

 

[kattywumpus]

Just purchased the tractor 2 weeks ago new, less then 4 hours on it at purchase. I don't remember the paper work indicating 2009 so I assume it 2010.

Initially there is no noise until after 1 to 2 hours of use. The time greatly depends on the type of use. Using ground engaging equipment, which works the transmission harder, will result in the sound occurring sooner. Once the sound starts it occurs sporadic for a period of time in reverse, maybe 30 to 60 minutes. After this period the squeal will occur constantly for the remained of the tractor use when in reverse. So the behavior of the squeal is dependent on the temperature of the transmission/ hydraulic fluid.

 

[dourobob]

Hi
Any progress on this?

Since I started reading your posts a few days ago my DK45SE HST has been producing the same kind of noise under almost the same conditions - after an hour in reverse in both low and mid range.

Thanks for doing the leg work and the YouTube video. This is on the list for my dealer to address.

Bob