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.