DK40SE Squeal When Moving in Reverse.

[dourobob]

Hopefully this will be the start of good things for you with Kioti.

Keep us posted.
Bob

 

[kattywumpus]

Had a good visit with Territory Manager Tom Martell and Product Support Engineer Terry Coley. A temporary fix was installed to reduce the hydraulic noise or squeal. I would like to drive the tractor more before giving my opinion. I learned some good information for Terry. He seem to know his stuff. I received a positive impression from the visit. More inform later.

 

[dourobob]

Great news.

I look forward to hearing the details as I seem to be having a similar squealing issue with my DK 45 SE HST

Glad to hear that the corporate folks are paying attention.
Bob

 

[kattywumpus]

The temporary fix does seem to reduce hydraulic squeal volume. It also appears to take longer before it occurs, but the cooler temperatures may also play a part in this. It does not eliminate the noise, but it is more bearable. The squeal can still become very annoying after 2.5 to 3 hours of hard transmission use in both directions. An example of this is moving a loam pile. Other types of tasks that don't use reverse as much do not appear to get to this level of annoyance. I'm still verifying this statement, I need to use the tractor more.


The temporary fix was to replace the very short steel tube between the HST filter and the transmission with a longer flexible hydraulic line with two 90s at the mounting points. This helps to reduce the amplification of the noise or pulsation transmission through the HST precharge supply line. It also reduces fluid friction. If for any reason you remove this short steel tube be aware the bolt for the transmission side is a little longer. From the Kioti visit it does appear they are aware of the issue and are working towards a solution. The sooner it comes the sooner I can sing the praises of Kioti, but my jury still out on this issue. It is a step in the right direction and I do appreciate their visit.

 

[dourobob]

Thanks for the update. Due to some complications with my eye I haven't been able to put in 2 or 3 hours at a time on my Kioti. The squealing for me happened in very warm weather and in cooler weather as well and it did not seem to take more than 1/2 an hour before it would start.

I'll ask my dealer about the temp fix when he does the 50 service (soon I hope) and I'll keep watching for updates regarding a permanent (or as permanent as anything can be with machines) fix.

As one of my local heavy equipment guys says "If you never used them, they would never break down."

Keep us posted please.

Bob

 

[wallace]

If this tractor has been out now for 3 years why is this a problem all of the sudden?
I have never had a customer say anything to me about a noise.
My DK40SE does not have any noise.
I'm thinking you have some trash or something stuck in a valve or something that is restricting the flow.
Please keep us posted as I would like to know what they come up with.

 

[tnewbern]

I just purchased a new DK40CHSE and I have the same issue. This only happens after the hydraulic fluid gets warmed up. I first noticed this after digging out a stump with the backhoe. I did a quick search and found this post.

I would say that it sounds like the pressure relief in the HST. Initially it only happens when you fully depress the pedal at progressively gets worse. In addition if you feather the pedal and only slightly engage there is no noise. The tractor is not seeing an excessive load and it seems to move fine. Running the tractor at higher RPM's seems to help or possible just mask the noise. The interesting part is this only happens after the fluid gets warm. I would think either the relief setting was adjusted with cold fluid or they are using a different fluid.

I have my dealer and regional rep coming to my property next week and I will post my findings.

Tom

 

[IslandTractor]

Interesting thread. I too have a DK40se HST (2007). I've never noticed this squeal. I have certainly run the tractor until it was warm with mowing, tilling and backhoe work but just have never noted the sound you guys are describing. I haven't seen any posts on the Bobcat thread either.

I wonder if Kioti changed something in assembly fairly recently? I'd think however that Rick would have commented on that.

I'll keep listening to see what you guys figure out.

 

[tnewbern]

My machine was just assembled at the NC facility last month and immediately loaded onto a truck. Actually the shipment was held up a couple of days and another machine bumped. The sound is very pronounced and very similar to kattywupus's video minus the rattle. My father stopped by after I got the tractor to drive it and thought that backup indicator was a neat feature. He was surprised when I told him that it was not normal. He even questioned me and thought that its sounded to deliberate to be anything else. IslandTractor is your machine a CAB unit or ROPS. I see that both myself and kaddywupus have the CAB maybe this has something to do with it. Also do both of your have the backhoe KB2485? Kaddy if so is yours installed when you here this noise? I have not tried working the machine to that point without the backhoe. I doubt that has anything to do with it but I figured I would provide as much info as possible.

 

[IslandTractor]

My DK40se is open station. I do have a backhoe but it is the Woods BH90x.

 

[dourobob]

...is your machine a CAB unit or ROPS. I see that both myself and kaddywupus have the CAB maybe this has something to do with it. Also do both of your have the backhoe KB2485? ...

This is getting even more interesting - and unfortunately sounding more frequent too.
My tractor is a CAB model and I do not have a backhoe (would love one but ... not yet anyway) and the noise is consistent once the fluid warms up.

Bob

 

[IslandTractor]

Anybody with an open station DK40/45/50se have this problem? Open station models must outnumber the cab versions by a fair margin so there should be some noisy ones unless it is an issue possibly related to the cab or changes made since the cab models came out.

 

[kattywumpus]

I think the backhoe is only a factor in warming up the hydraulic fluid. While I work the backhoe the sound does not occur. The HST must be used. Keep in mind if you hit the reverse pedal and the transmission in neutral the sound will still occur because you engaged the HST but the transmission is disengage. When the sound occurs it can be heard outside of the cab. Before the temp fix you could easily hear the squeal several hundred feet away.

I will be happier with my backhoe once the upside down frame and leaking hose issues are resolved. It's been a month now since I learned about the backhoe issues and almost 3 month since I reported the sound the first day I used the tractor.

 

[Kiotisooner]

I have a DK50HST with ROPS. Mine will make a squealing noise only every now and then. It mostly happens in reverse. I haven't contacted the dealer yet. Tonight I put my 6 ft. Gannon box blade on it with all 8 ripper blades down to see if it would rip up the area. I put it in low and 4 wheel drive. The tractor would not spin the tires, just pull the engine down some and relieve on the HST pressure relief. After this, the squeal was noticeable in High range, forward and reverse. Is this what is happening to yours?

 

[MotorSeven]

2 year old DK40SE Hydro open cab, 400 hrs.....never a squeal.

RD

 

[ON84]

2007 Kioti DK45S with backhoe. 320 hours.

No squeals except when I accidentally bumped the detent valve.

 

[kattywumpus]

I have a DK50HST with ROPS. Mine will make a squealing noise only every now and then. It mostly happens in reverse. I haven't contacted the dealer yet. Tonight I put my 6 ft. Gannon box blade on it with all 8 ripper blades down to see if it would rip up the area. I put it in low and 4 wheel drive. The tractor would not spin the tires, just pull the engine down some and relieve on the HST pressure relief. After this, the squeal was noticeable in High range, forward and reverse. Is this what is happening to yours?

No, not in forward with a load or not. I have used both a 6' box box blade and scraper blade. The only time it makes the squeal going forward is after an hour or so when I'm going slow down a hill. This action reverse loads the HST.

 

[Coyote machine]

KattyW,
You're not crazy- it is the guy at the dealership who is giving you a hard time for NO fault of yours
I just upgraded my 1 year old DK-35se/hst to a 2010 DK-40sehst open( no cab), and it started this afternoon squealing like a run over cat! D**n!
I do not currently have my KB-2485 backhoe attached, but have my Igland 4001 winch running off my 3pt hitch.
I was cutting some trees around my flip house and had the tractor at idle for quite some time- maybe 30 minutes or so and when I went to use again it I noticed the high pitched squeal- sort of like a seized bearing or pump and was surprised to hear it, hoping the factory had actually installed all the fluids!?
Now the tractor had 3 hours on it when I received it at my door, no cab, no backhoe, no stress on the new tractor since I'm taking it easy and slow for the first 20hours or more anyway so things can break in properly.
So I'd have to conclude from everything I've read so far this is a problem that Kioti is aware of but seems to not have the solution to - YET!
It seems it affects some tractors and not all and since the engines are the same all the way up to the 50 from the 40, it is likely an internal part or something that is used on some but not likely all of the similar models. For instance a pressure relief valve that is supplied by two or three different manufactures but is somehow slightly different in its design or some other factor that affects the specific tractors that had it installed at the factory. I will be contacting my dealer tomorrow morning. Please all keep posting until we get this resolved- and Katty w, don't give up- it will get fixed!

 

[csholler]

I have a DK50se cab and it does the same thing. It has not affected the performance in any way but it does bother an operator after a while. I have notified my dealer and he has given me pretty much the same info as all of yall have received. I think the best hing we can do is stay on our dealers about this issue so our dealers will stay on Kioti.

 

[IslandTractor]

So now we have cab and non cab versions of the new DK series making the noise but I don't believe we have any reports from tractors built before 2009 or so. Doesn't that make it likely that Kioti changed something in design or part supplier in the past year or so and shouldn't that help them narrow down what the issue is? Are there any reports from the Bobcat CT400 series owners?

By the way, congratulations Coyote on your new 40se. I'm sure you will love it (once the noise goes away:laughing.