D6D stall test - advice?

Looking at a D6D 04x and it won’t push through the brakes when stalling the converter. Local guy here is saying this is true for a D6D of the 04X series. I’m confused as I thought it would based on my readings here.

I made a short video with it at 3/4 throttle sitting on the brakes and going through the gears. Tried to get tracks, gear selector and driveshaft all in one shot.

thoughts?

So what's the problem?
Bob

Looks like it is doing what it is supposed to do.

Looks like I’m misunderstanding what I read in the forums. I thought this tractor would push through the brakes in first but stall in third.

It may at high idle but not at 3/4.
Bob

I guess that’s why I’m confused. Why would high idle push through but higher in the rpms won’t? Brake boost is much higher?

LCA078 said:

I guess that’s why I’m confused. Why would high idle push through but higher in the rpms won’t? Brake boost is much higher?

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High idle is the throttle pulled all the way back.
Bob

Bluox said:

High idle is the throttle pulled all the way back.
Bob

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hmmm- I’d call it wide open but I’m new to this rodeo so I do appreciate the education.

on another note- I also stalled it at ‘high idle’ and same result. Call it full throttle, wide open, fire-walled, etc, that tractor was not moving in any gear with the brakes pushed. The tc temp slowly crept up to upper third green after what seemed a long two-three mins in first but it never got to red. The auction house folks were eyeballing me so I backed off. Tc temp them slowly went down to low green.

LCA078 said:

hmmm- I’d call it wide open but I’m new to this rodeo so I do appreciate the education.

on another note- I also stalled it at ‘high idle’ and same result. Call it full throttle, wide open, fire-walled, etc, that tractor was not moving in any gear with the brakes pushed. The tc temp slowly crept up to upper third green after what seemed a long two-three mins in first but it never got to red. The auction house folks were eyeballing me so I backed off. Tc temp them slowly went down to low green.

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Most auctions would have run you off for abusing the tractor and dangerous actions.
A stall test is a valuable test when done properly.
Maybe you should hire someone who knows what they are doing before you get in trouble.
Bob

It probably depends somewhat on the condition of the brakes. Sounds like they're in good shape. 3rd gear stall test makes no sense. I think someone commented that a Komatsu (D41?) could drive through the brakes in 1st gear. This is a totally different machine. Cat calls full throttle high idle.

I don't think that test will tell you anything except possibly that the brakes are worn or out of adjustment. The only thing I've used a stall test is to check turbo boost level or to see if the trans input is turning or not.

What you are missing is the RPM of the engine when the torque converter is stalled. Most machines will drive through the brakes in first. A D6D though is an old machine with an old engine. Did the engine speed drop down when you put it in third gear stall? If so, how much? They do make tachometer pickups that will attach to a fuel injection line for that vintage of machine that will give the RPM on a display unit. Did you check turbo boost while you were there?
You are right though on one thing, the test will do you no good at all if you don't understand what you are doing and don't have the right tools to do it with.

I myself would not be keen to Stall Test any Tractor in 1st gear with the engine on full bore, 2nd and 3rd speed calm things down some, the danger is knot knowing how good or bad the Brake System is on something you have jumped on for the first time, in a tight Site things can go bad very fast, lots of CAT equipment will drive through the Brakes in 1st speed with all you are doing is damaging the equipment, the Torque Stall Test on a D6D starts off by first doing a speed test on the engine from the low idle setting then the high idle setting, these figures are listed in the CAT Rack Setting chart for the Serial Number of the tractor, then with the engine warmed up as required the Stall test can be done, at High Idle in 2nd or 3rd gear with the brakes firm on the engine speed can be checked to see what speed the engine loads down to, the spec figure is listed to be within it's operational target speed, you would not stall out the Torque for any longer than needed as again all you are doing is harm, I would never Stall Test anything without reason the fact that it's at a Sale Site would put me off more, checking the drive shaft locks when speed/direction is selected at moderate speeds against the brake is about all you need to do unless you have the correct tooling and information to make any judgement on what data you note.
tctractors.

I'll respectfully disagree on how long you can stall out a Cat torque converter. You can stall it out until the temperature gauge reaches the red mark. Stalling it is no different than pushing a big load on the blade. On things like a Cornbinder or an Allis, about a minute is all you need. You can still stall them to the red mark on the gauge but it will get there a lot faster on those makes than it will on a Cat. I stall test every machine I inspect that has a torque converter / power shift transmission.

John C. said:

I'll respectfully disagree on how long you can stall out a Cat torque converter. You can stall it out until the temperature gauge reaches the red mark. Stalling it is no different than pushing a big load on the blade. On things like a Cornbinder or an Allis, about a minute is all you need. You can still stall them to the red mark on the gauge but it will get there a lot faster on those makes than it will on a Cat. I stall test every machine I inspect that has a torque converter / power shift transmission.

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We all do things our own way John, I am not keen to flog out anything I don't need to just to get it Hot, my plan that I try to stick to with unknown to me Tractors is avoid any damage or risk, do the Job, then get Paid, I have ran Torque Stall tests to check temp issues etc many times, this is until the alarm bell rings in H/Drives, but on Flat Drive Tractors I take more care, I am not a Machinery Appraiser just a Field Donkey that likes to be careful with other peoples equipment and not keen to cause any problems.

Odd there is no mention of one of the real advantages for stall test.
It's a good way to sort out whether a flooded torque converter housing is due to a leaking torque converter or a failing scavenge pump.

A lot to do with how fast it was able to cool down after the test. We used to warm up the wheel loaders by stalling them out in 3rd gear with the right pedal and cycling the hydraulics. Always kept an eye on the trans temp though.