Curious - what did you do or what happened that the transmission needs replacing?

 

I purchased it with the weak transmission so not sure the cause... has 2000 hrs on the tractor. I have changed the fluid and filter as well as the hydrostatic relief valves... some improvement but in reverse the tractor will not go up a 15 degree incline, forward is better, but still weaker than I would expect

 

Have you tried calling TuffTorq? I've read on here where guys have called and spoke with them, apparently they have good customer support and will help you find whatever part numbers you need whether it's a part, complete rebuild kit or a whole new unit.

 

Have only spoken with the JD dealer... will try Tuff Torq next.

 

Here are a couple of options for Tuff Torq K92 Transmissions:

Mulligans Parts Company

Tuff Torq K92

There should be a tag somewhere on your transaxle with the TT model and serial number. You'll need this for service and parts information.

 

Thanks, unfortunately there is no tag to be found... suspect it was pressure washed and the tag came off. I am hoping with the tractor product id tag, tuff torq will be able to identify the transmission

 

OP,
Be aware that there are many sub models of the K90 and K92 transaxle. Those sub models determine the what options come with the unit. Also be aware that a new K90-92 will cost in excess of $6000 dollars. I would suggest that you contact TuffTorq and JD to see what parts and options are available before you do anything else. This transmission is the king of the TuffTorq line and well worth repairing. Good luck.

 

Thanks, will call tuff torq tomorrow... would prefer used transmission as I am guessing would be simpler to swap out than open the transmission and do a rebuild.

 

FYI, I recently repaired a dead Tuff Torq K46 in an X300. Ordered $85 worth of parts from TT and had the unit repaired, reinstalled and running in a few hours.

It's possible your K92 may only need a refresh and I doubt it's totally shot. Could be anything from low fluid due to leakage to mechanical disaster. That being said disassembly & inspection are likely the first step for you or someone mechanically capable.

 

It all depends whats wrong with your transmission. There are many subsystems in it - each with its' own repair approach, and each with completely different needs of "how" to do it. For example.... hydraulic pump for basic hydraulic flow and pressure for implements and power steering (including flow diverters, pressure regulators, and PRV valves)... variable displacement pump and motor for tractor fwd/rev motion..... front drive shaft gears and engagement systems... rear differential and differential lock...... wheel brake..... PTO shaft and gears (including PTO clutch and PTO brake).... the case / housing... etc.

So... what's wrong with your transmission (or what happened to it) that it may need overhaul or replacement?

 

Thanks wally2q, the tractor will not go up a 15-20 degree incline in reverse, better forward but still not what I would expect. It also makes a slight clunking sould every tire rotation, and finally when driving forward, if I take my foot off the pedal quickly it doesn't continue to roll forward. I purchased it this way, and the original owner was not able to provide much of an explanation. Given the above, I am not convinced the Tuff Torq rebuild kit will address all of these problems which is why I would prefer to swap it out with a used one in good working order.

 

Typically it’s the subsystem within the k92 that is repaired. IE PTO clutch, differential, brake or case/housing. What exactly is your issue?

 

i would recommend that you don't think of whatever needs repair is contained in a "rebuild kit". There really isn't such a thing for this transmission.
There may be kits for various systems, but no generic kit. Not like a k46 - where the only part to deal with is the var. displacement pump and motor.

Clunking on wheel revolution could be gear / diff problems. Or it could be loose wheel bolts / wheel wobbling. Or it could be a worn bearing in the wheel axle.
Weakness sounds like hydraulic pump/motor problem. Could be a plugged filter. low on oil. could be badly adjusted or slipping actuator levers.

you said: "if I take my foot off the pedal quickly it doesn't continue to roll forward. "
it's not supposed to. this is normal.
the tractor will come to a stop when you let go of the pedal.... now if the discussion is that the stop is "abrupt" as in you are about to go over the steering wheel when you let of the pedal... vs "it slows down over the span of a few feet".... this is most likely caused by the external damper.

So... bottom line... if you need help understanding what may be needed to fix it... and how to go about it - we're going to need a lot more detail w.r.t. what is happening under various conditions.
if you simply decided to just replace the transmission from the get-go, then yea - a search for "parts tractors" is in order....

 

You are wanting part number MIA11936. On EBay there is one used transmission for 1000. And several new for 2300.

Are you certain the clicking noise is from the transmission. The driveshaft and front axle are also know to cause clicking. As short as the x7 is it can be hard to pick out front to rear noise at times.

 

You might want to start with a troubleshooting manual. Before doing anything else jack the rear wheels off the ground and make sure the brakes aren't dragging. Something as simple as a bound-up brake linkage could cause lack of power.

Simple pressure tests will help you to determine whether you have pump or hydraulic motor issues. Back in the day I used to rebuild automotive, Lt. truck and HD Allison dual-range automatic truck & bus transmissions that came in on the hook. Rarely was there anything seriously wrong with them. Usually just basic disassembly & inspection. Measure everything for wear and then some seals, o-rings, sometimes nothing more than a stuck spool in a valve body and occasionally replacing some worn clutch disks was all it took to get them back out on the road for another 100K+ miles. Few had serious mechanical issues.

Other than a PTO, differential lock and remote hydraulics your K92 is just a larger version of a small lawn tractor transmission. There's virtually nothing to them.

As far as used parts are concerned, you never know what you're going to get.

 

You need a good mechanic to help you with this, verses simply buying another used unit.

The problems you describe can be normally "adjusted" out of the machine, following the proper procedures. If the machine is moving and isn't grinding itself to bits, its usually a matter of diagnosing and repairing the issues at hand. I have seen broken ring gears, sheared off ring gear bolts, worn PTO clutches, swash plates out of adjustment and causing serious power deficiencies. But I have never seen a unit was "junk" and needed to be entirely replaced. Not even close....

You need to start with two very important technical manuals if you are going to be working on this project yourself. You need a John Deere Technical Service Manual for the x748 and make sure you get a REAL Deere, authorized copy and not some generic version. These are exceptional manuals for repairing and properly diagnosing all mechanical issues of the machine and provide very helpful information. The Deere TSM for the x748 is sold here.

Search for Equipment Publications - Technical Information Store

techpubs.deere.com

Note, the manuals are based upon your tractors serial number range and its important you order the correct manual to be of most help to you. These manuals are not cheap, but they are worth their price in diagnosing and properly repairing your machine. It's an investment in your machine and these manuals make a huge difference

Go to this Tuff Torq Link below and search for the various repair and diagnosis information for the Tuff Torq model in your machine. Many of these manuals are free and are very helpful.....There are also other resources to be found here to help you diagnose the issues you are having with your x748.

Tuff Torq Ordertree | Home

tufftorq.ordertree.com