[Hostaman]

As we all know the Transaxle Relief Valve BW15043 is for 2WD and BW15044 is for 4WD. What would be different about them?:dunno:

 

[eKretz]

The only thing I can think of is maybe different set relief pressure.

 

[Hostaman]

I thought about that. I am going to trade my X700 in on an X728 and wish I could use the TFV. I won’t do it, it’s just wrong but it does make one wonder.

 

[Hostaman]

Well, I guess that we stumped the panel of experts on this question.

 

[eKretz]

I think you probably just asked a question that nobody has even thought much about previously. Speaking for myself, I own an x595 with a loader, and the dealer installed the THRV before the tractor was delivered. I've never even thought about it other than to know it's there.

 

[Sergeant]

Hostaman contact Tuff-Torq since they are the actual Manufacture of the Valve and not Deere https://www.tufftorq.com/contact/ and they can tell You why You need a different valve or not:thThumbsU

 

[Hostaman]

Thank you Sergeant...email is on the way.

 

[eKretz]

Let us know what they say. Now you've got me curious.

 

[Hostaman]

Apparently Tuff Torq has a bring you children to work policy and while there allows them to answer the technical questions.

Tuff Torq says that John Deere has never purchased the K92 from them and they don’t understand my question.

 

[Hostaman]

This is the response that I received from Tuff Torq...


Hello,
John Deere does not buy the K92. They buy the K91 which is a little different and has a few parts that are different from the K91. But I do not really know what you are referring to in your email. If it is the valves on the center case the different ones are for different applications. So I am wondering what you are meaning.


Thank you for your inquiry, today. Do not hesitate to contact us if you have any further questions.

Tuff Torq Corporation
After Market Service Parts
6041 Hunter Road
Talbott, TN 37877
Phone (866) 572-3441
Fax (423) 317-2312
Com_Net redirection


Here is my response back to them...

I apologize for the mistake. The 2006-2012 X Series tractors used the TT K92 according to my research.

When adding a John Deere Model 45 FEL to one of their older X Series lawn & garden tractors the instructions recommend that a Transaxle Hydrostatic Pressure Relief Valve (THRV) replace the OEM Forward Free Wheeling Valve in the K92. The John Deere part number is BW15043 for a 2WD tractor and a BW15044 for a 4WD. These THRV's are taller than the OEM valve and require a different Free Wheeling Lever be used to allow the tractor to roll when not running. Apparently the K92 achieved “relief” by tire spin that can sometimes be compromised with extra ballast and other weight when using a Front End Loader.

I am trading a 2008 X700 2WD tractor for a 2012 X728 4WD and wanted to know if it would be a problem to use the BW15043 THRV in the 4WD X728 as I am having trouble locating a BW15044 that is made specifically for the 4WD tractor.

 

[eKretz]

Well handled. I probably would have asked for Daddy. You can probably tell that I sometimes have little patience for the ignorant.

 

[Hostaman]

Thanks,

It doesn’t look I’ll get an answer to the question. You must be right about the relief being a different set point...what else can it be?

 

[eKretz]

Nothing I can think of on the MFWD tractors. On HFWD there could conceivably be a separate hydraulic circuit for the front wheels.

 

[Sergeant]

This is the response that I received from Tuff Torq...


Hello,
John Deere does not buy the K92. They buy the K91 which is a little different and has a few parts that are different from the K91. But I do not really know what you are referring to in your email. If it is the valves on the center case the different ones are for different applications. So I am wondering what you are meaning.


Thank you for your inquiry, today. Do not hesitate to contact us if you have any further questions.

Tuff Torq Corporation
After Market Service Parts
6041 Hunter Road
Talbott, TN 37877
Phone (866) 572-3441
Fax (423) 317-2312
Com_Net redirection


Here is my response back to them...

I apologize for the mistake. The 2006-2012 X Series tractors used the TT K92 according to my research.

When adding a John Deere Model 45 FEL to one of their older X Series lawn & garden tractors the instructions recommend that a Transaxle Hydrostatic Pressure Relief Valve (THRV) replace the OEM Forward Free Wheeling Valve in the K92. The John Deere part number is BW15043 for a 2WD tractor and a BW15044 for a 4WD. These THRV's are taller than the OEM valve and require a different Free Wheeling Lever be used to allow the tractor to roll when not running. Apparently the K92 achieved “relief” by tire spin that can sometimes be compromised with extra ballast and other weight when using a Front End Loader.

I am trading a 2008 X700 2WD tractor for a 2012 X728 4WD and wanted to know if it would be a problem to use the BW15043 THRV in the 4WD X728 as I am having trouble locating a BW15044 that is made specifically for the 4WD tractor.

Here is the Valve But You can also use AM122228 But Keep In Mind Just a different Part Number But it costs $80 more than BW15044
https://www.greenpartstore.com/John-Deere-Transaxle-Hydrostatic-Relief-Valve-BW15044.html

https://greenfarmparts.com/?s=BW15044+&x=21&y=11

So You Can use either BW15044 or AM122228 But the BW has a Lower Price Tag

Just Ask Tuff-Torq why 2WD Machine Need a Different (PRESSURE RELIEF VALVE) Than 4WD or AWD Machines Tuff-Torq won't Know anything Based On Deere Part Numbers Just Call it a PRESSURE RELIEF VALVE and they May not Get as confused and tell them it for a K90 series transmission :thThumbsU

 

[Hostaman]

Thanks Sergeant, it’s actually about $115 more:tango_face_surprise.

I can get one from GreenPartsStore or any of the other parts suppliers. My Dealer has the X728 and I am going to let him do the up fitting (THRV, shutoff valve, free wheeling lever, 3PT hitch) and I’m sure that he doesn’t want to go to an outside source for the parts.

If necessary I’ll just buy the tractor from him and do all the work myself.

As for Tuff Torq, thanks again for the contact info but I’m just going save the effort and blindly move ahead. I was just interested in the difference.

 

[Sergeant]

Thanks Sergeant, it’s actually about $115 more:tango_face_surprise.

I can get one from GreenPartsStore or any of the other parts suppliers. My Dealer has the X728 and I am going to let him do the up fitting (THRV, shutoff valve, free wheeling lever, 3PT hitch) and I’m sure that he doesn’t want to go to an outside source for the parts.

If necessary I’ll just buy the tractor from him and do all the work myself.

As for Tuff Torq, thanks again for the contact info but I’m just going save the effort and blindly move ahead. I was just interested in the difference.

When I bought My X748 I already Had the Valve I mailed it to the Dealer as they were a 3hr Dive away from Me Because the dealer will Probably order AM122228 and then charge You freight On it So why Not save a Little On the Build:thThumbsU

 

[Pete_Craftmn_TN]

Hi Folks, thanks for the great information. Just checking that these part numbers are also the right ones for the latest signature series x700's. I bought a X738 last year and planning on getting one of the small buckets, probably the Little Buck Loader. Are these valve part numbers still the same? Free wheeling lever too M146148?

thanks for all the great help
=============================
Well after doing some checking I found a thread on GreenTractorTalk where Sergeant recommended these parts for a 739. I figured they were still the right parts for the Signature series but wanted some confirmation before I ordered. The various threads I read on MTF never mentioned the Sig series. Some of us haven't been around these machines long so double checking is wise.

Pete

 

[heathiopian]

I know this is a two year old thread, but since I recently got the answer at the dealer, I figure I'd pass it along. The parts guy was able to look up exact specs. It's been a month ago, and I know nothing about hydraulics, but the difference was the pressure rating. I believe he said 3600 for the 2wd and 4900 for the 4wd. Like I said, I don't know what those numbers mean, but I'm sure some of you do.

 

[Nouveau Redneck]

They are the pressures (3600 psi and 4900 psi respectively) at which the relief valve opens to allow fluid to bypass the circuit in case the pressure builds to high. It is a safety mechanism, both to protect the hydraulic circuit from too much pressure building if something is blocking the flow, and to protect you, the human operator from injury in case something were to blow out because of too much pressure building. Apparently the 4WD circuit is designed to handle a lot more pressure than the 2WD circuit. If you use the lower rated relief valve from a 2WD system in a 4WD tractor, chances are that you would not be able to utilize the 4WD tractor to its fullest capabilities, as the relief valve would open at the lower pressure and allow the fluid to bypass the part of the circuit where the work is being done when the pressure hadn't reached the true rating for the circuit.