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post #1 of 16 Old 07-16-2019, 02:02 PM Thread Starter
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What is different about 4WD and 2WD Transaxle Relief Valve?

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

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post #2 of 16 Old 07-16-2019, 04:51 PM
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The only thing I can think of is maybe different set relief pressure.
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post #3 of 16 Old 07-16-2019, 06:04 PM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

I thought about that. I am going to trade my X700 in on an X728 and wish I could use the TFV. I wonít do it, itís just wrong but it does make one wonder.

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54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
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post #4 of 16 Old 07-17-2019, 01:26 PM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

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

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54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
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post #5 of 16 Old 07-17-2019, 01:29 PM
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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.
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post #6 of 16 Old 07-18-2019, 11:29 AM
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

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

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post #7 of 16 Old 07-18-2019, 03:42 PM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

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

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54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
*named by PA318Guy
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post #8 of 16 Old 07-18-2019, 08:08 PM
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Let us know what they say. Now you've got me curious.
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post #9 of 16 Old 07-23-2019, 10:07 AM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

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 donít understand my question.

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post #10 of 16 Old 07-23-2019, 10:26 AM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

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 ďreliefĒ 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.

X728, X729
54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
*named by PA318Guy
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post #11 of 16 Old 07-23-2019, 11:24 AM
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Well handled. I probably would have asked for Daddy. You can probably tell that I sometimes have little patience for the ignorant.
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post #12 of 16 Old 07-23-2019, 11:52 AM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

Thanks,

It doesnít look Iíll get an answer to the question. You must be right about the relief being a different set point...what else can it be?

X728, X729
54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
*named by PA318Guy
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post #13 of 16 Old 07-23-2019, 12:04 PM
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Nothing I can think of on the MFWD tractors. On HFWD there could conceivably be a separate hydraulic circuit for the front wheels.
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post #14 of 16 Old 07-23-2019, 12:24 PM
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

Quote:
Originally Posted by Hostaman View Post
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 ďreliefĒ 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-...e-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
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Ingersoll Model:3016PS
Simplicity Models:Wonder Boy
White Model: GT2055



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"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Last edited by Sergeant; 07-23-2019 at 12:31 PM.
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post #15 of 16 Old 07-23-2019, 01:14 PM Thread Starter
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Re: What is different about 4WD and 2WD Transaxle Relief Valve?

Thanks Sergeant, itís actually about $115 more.

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 Iím sure that he doesnít want to go to an outside source for the parts.

If necessary Iíll just buy the tractor from him and do all the work myself.

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

X728, X729
54" Deck w/BM20827 Mulch Kit, 45 Loader, JD BM23882 Cat 1 3PH, JD LPHDC18JD 18 CuFt Cart, JD LP22862 25 Gallon Sprayer, JD LPPA48JD 48" Core Aerator, JD LP25001 3-Point Receiver Hitch, JD BM17972 50 lb. Cast Wheel Weights, JD BM22725 Wheel Spacers, Custom Heavy Hitch, TOMBSTONE* Ballast Slab, Eight Suitcase Weights, Fluid Filled HDAPs on Stock Wheels, Turfs on SE Wheels, SE Seat, Brush Guard, Click-N-Go Weight Bracket (Modified to hold eight suitcase weights)
*named by PA318Guy
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