DK40SE Squeal When Moving in Reverse.

[Coyote machine]

ROFLMAO!

I knew someone would pick up on the irony of my post

So KWumpass, If Kioti knows so much about what is NOT causing the squeal- do they know ANYTHING about what IS causing it?!

 

[tnewbern]

The HST pressure test is performed thru 2 ports located on the side of the unit (under the left floor deck). These ports are actually part of the neutral valves. The test is detailed in the service manual your dealer should know this.

Coyote Machine:
The tractor has a tandem hydraulic pump the first section powers the (FEL, 3PT hitch and implements) and the second (4WD, PTO, Steering and the HST).

Kattywumpus:
Did your dealer do a pressure test on your HST and what were the results. I was not implying it was the high pressure reliefs but rather the charge relief valve. The charge relief controls the fluid on the low pressure side. I am curious if the low readings I am getting are shared or local to my machine. If the HST is not getting enough fluid it will cavitate and make all sorts of noise.

I share your pain with the squeal. I am tired of people telling me HST transmissions make noise or I am not driving it right. I just want this fixed and if I have to get dirty then so be it.

 

[grsthegreat]

The HST pressure test is performed thru 2 ports located on the side of the unit (under the left floor deck). These ports are actually part of the neutral valves. The test is detailed in the service manual your dealer should know this.

Coyote Machine:
The tractor has a tandem hydraulic pump the first section powers the (FEL, 3PT hitch and implements) and the second (4WD, PTO, Steering and the HST).

Kattywumpus:
Did your dealer do a pressure test on your HST and what were the results. I was not implying it was the high pressure reliefs but rather the charge relief valve. The charge relief controls the fluid on the low pressure side. I am curious if the low readings I am getting are shared or local to my machine. If the HST is not getting enough fluid it will cavitate and make all sorts of noise.

I share your pain with the squeal. I am tired of people telling me HST transmissions make noise or I am not driving it right. I just want this fixed and if I have to get dirty then so be it.

geesh, if i had a pressure testing valve id go test mine and tell you the results. i do need to get one of these guages.

Page 5-22 of the service manual shows how to perform the test. seams easy. WAIT: the manual states neutral pressure is/should be 255 PSI but operating (driving) should be 4975 PSI. is this correct? nearly 5,000 pounds of pressure?

 

[grsthegreat]

Spoke to my dealer about possibly testing the hydraulic relief valves and such. He says there is a way to test the hydraulic pump that supplies the rear remotes etc., but the HST is a separate pump and he does not know of a place to put a gauge to test its pressure(s), etc.

Any thoughts on this?

I do not know if there are in fact two different pumps for HST and other hydraulics- I am under the impression there is/was only one pump for all hydraulic fluids?!:confused2:

According to my service manual page 5-22 the hose from the gage connects to the plug under the left floor deck.Looks to be right inside of the step. On my cab unit its just above the tool box.

 

[tnewbern]

Yes that is correct. You will either need 2 gauges a high pressure and a lower pressure or a digital gauge do you can get accurate reading for the charge pressure. You will also need an 7/16-20UNF adapter to connect to the test ports. The manual details both tests and you must be careful not to engage the HST while the low pressure gauge is connected.

My setup is a 5' 5000 PSI hose (burst is 20,000 PSI) with diagnostic quick coupler (not cheap). I got 2 gauges 0-6000 PSI and 0-500 PSI both with quick couplers. I got a 7/16-20UNF to 3/8 JNI but you can substitute for what ever is convenient to connect to your hose.

Today I bypassed the oil cooler with no joy (thinking it might be the restriction). I was able to test the pressure before the HST filter. This test setup is a bit trickier with the hard lines and all. The pressure here is much higher (over 250 PSI @ idle) indicating the filter may be the restriction for me. I am not say this is the problem as I have already changed the filter.

The low charge pressure may not even be related to the squeal but how can you look beyond an out of spec charge pressure. If you google HST charge pump and read you will see how important it is to a closed loop HST system. Here are some links to articles but there a many more.

Correct Charge Pressure Setting in Closed loop Transmissions

Hydrostatic transmissions

And this just for fun...

Troubleshooting Hydraulics

 

[dfkrug]

geesh, if i had a pressure testing valve id go test mine and tell you the results. i do need to get one of these guages.

Page 5-22 of the service manual shows how to perform the test. seams easy. WAIT: the manual states neutral pressure is/should be 255 PSI but operating (driving) should be 4975 PSI. is this correct? nearly 5,000 pounds of pressure?

I was just going to ask what the M24 HST pressure spec was. To put that in
perspective, my CK30 (M27) is only 4000psi, while my JD 4300 is 6000psi.

To do this test, you need to get a 10,000psi guage, unless you can find
one that is only 6 or 7K psi (less likely). There are 3 test ports, which are
readily accessible on tractors I have owned. They are for fwd, rev, and
charge pressure.

Note that some tractors have a separate charge pump for the HST (e.g.
my B21 did), or charge volume is provided from the PS pump (e.g. my
CK).

The HST relief valves are readily accessible on my CK, and the specs are
the same for F and R. Maybe the OP could swap the RVs on his DK to see
if it still squeals in reverse? At least that would rule out the RV as possibly
weak.

 

[Coyote machine]

Yes that is correct. You will either need 2 gauges a high pressure and a lower pressure or a digital gauge do you can get accurate reading for the charge pressure. You will also need an 7/16-20UNF adapter to connect to the test ports. The manual details both tests and you must be careful not to engage the HST while the low pressure gauge is connected.

My setup is a 5' 5000 PSI hose (burst is 20,000 PSI) with diagnostic quick coupler (not cheap). I got 2 gauges 0-6000 PSI and 0-500 PSI both with quick couplers. I got a 7/16-20UNF to 3/8 JNI but you can substitute for what ever is convenient to connect to your hose.

Today I bypassed the oil cooler with no joy (thinking it might be the restriction). I was able to test the pressure before the HST filter. This test setup is a bit trickier with the hard lines and all. The pressure here is much higher (over 250 PSI @ idle) indicating the filter may be the restriction for me. I am not say this is the problem as I have already changed the filter.

The low charge pressure may not even be related to the squeal but how can you look beyond an out of spec charge pressure. If you google HST charge pump and read you will see how important it is to a closed loop HST system. Here are some links to articles but there a many more.

Correct Charge Pressure Setting in Closed loop Transmissions

Hydrostatic transmissions

And this just for fun...

Troubleshooting Hydraulics

Good work! Thanks for the info and clarification about the split pump function, etc. I often feel as if my dealer speaks as if I am clueless, when I'm asking them to do things to solve problems?! It's as if they don't want anyone to know about anything but them- you know like its top secret or something like that! :confused2:

BTW, not bad for a jersey boy:thumbsup:

Keep the info coming. This thread is being viewed by many people, and we will prevail with Kioti eventually; even if I have to make it a personal mission.

 

[grsthegreat]

cool, ill check on some gauges, as they would be a handy thing to have around.

 

[grsthegreat]

Yes that is correct. You will either need 2 gauges a high pressure and a lower pressure or a digital gauge do you can get accurate reading for the charge pressure. You will also need an 7/16-20UNF adapter to connect to the test ports. The manual details both tests and you must be careful not to engage the HST while the low pressure gauge is connected.

My setup is a 5' 5000 PSI hose (burst is 20,000 PSI) with diagnostic quick coupler (not cheap). I got 2 gauges 0-6000 PSI and 0-500 PSI both with quick couplers. I got a 7/16-20UNF to 3/8 JNI but you can substitute for what ever is convenient to connect to your hose.

Today I bypassed the oil cooler with no joy (thinking it might be the restriction). I was able to test the pressure before the HST filter. This test setup is a bit trickier with the hard lines and all. The pressure here is much higher (over 250 PSI @ idle) indicating the filter may be the restriction for me. I am not say this is the problem as I have already changed the filter.

The low charge pressure may not even be related to the squeal but how can you look beyond an out of spec charge pressure. If you google HST charge pump and read you will see how important it is to a closed loop HST system. Here are some links to articles but there a many more.

Correct Charge Pressure Setting in Closed loop Transmissions

Hydrostatic transmissions

And this just for fun...

Troubleshooting Hydraulics

when you bypassed the cooler, did the squeal go away? you said the pressure went up

 

[tnewbern]

Sorry for the confusion.

No the squeal was still there and the HST charge pressure was the same. What I measured was the pressure before the filter.

You should get yourself a service manual. Check with your dealer they are about $100 or so. There is some good information in there and a bunch of stuff that should be in the owners manual.