Case o Matic

[rickdude]

Hello all
Ive been working on an 800 Diesel case o matic tractor and I took it out for its first run at a local tractor pull last weekend. The first pass I was pretty pleased with, I ran in COM and it pulled well, I kept the throttle to the pin and I finished up by spinning out at the end of the run. On day 2 I operated the same way at full throttle but felt like the torque converter stalled out at the end of the run instead of spinning the tires stopped pulling short of where I thought it should have. What would cause the torque converter to stall out? I didnt think to watch the clutch pressure gauge right at the end of the run so I couldnt say for sure if the pressure dropped or not at the stall. The only difference from the day before was I added at least 1 more quart of oil, as she has a few leaks and I didnt want to be low, but looking at it now its at least 1-2 quarts over full. I was running in 4th gear low range.

 

[Roger Link]

Once the load gets great enough the torque converter will stall out, if it didn't it would kill the motor. The track conditions could have changed or the weight class changed, how far did the engine RPM drop down to?

 

[casecollectorsc]

4th is a pretty tall gear for stock. I ran my 800 in 3rd com or 2nd direct.

 

[mEl]

(reply to post at 15:22:11 06/12/23)

Depending on weight classes pulled , 4 th gear is a bit to much for the HP an 800 has. As Roger said, the COM stalled as is normal when overloaded, There is a stall speed for diagnosing TC problems but the tach has to work or an external tach used,Stall speed would be the rpm that it holds in 8th gear full throttle hood to something that can't move or good brakes. Another hint, High Idle must be to spec or a bit above, the COM s like RPMs and that can help pulling, if it were mine I would have High Idle at 23-2350 RPM. especially for pulling. Allowing the DOM to stall does no damage, Good luck pulling, keep us posted

 

[rickdude]

Heres a clip from the video

 

[rickdude]

Apologies, I cant seem to get the 4mb video too load

 

[rickdude]

I dont think the RPM dropped very much, hard to say as the tach isnt working yet. I think if I had pulled in direct it would have pulled the revs down a lot more.

 

[rickdude]

<video width=90% src=https://www.yesterdaystractors.com/cvvideos/cvvideo156400.mov controls>http://forums.yesterdaystractors.com/cvvideos/cvvideo156400.mov</video>

 

[rickdude]

<video width=90% src=https://www.yesterdaystractors.com/cvvideos/cvvideo156401.mov controls>http://forums.yesterdaystractors.com/cvvideos/cvvideo156401.mov</video>

 

[John Saeli]

Nothing wrong w/ that converter!! That's a big tire to spin in 4th. Even though she stopped spinning, she kept the tire squatted. Never dump the clutch before throttling back 1st.

 

[rickdude]

Thanks for the replies everyone, it sounds like I was asking a bit much with running in 4th. Im running 18.4 30s which were on it when I rescued it from the scrap yard, so Ill gear down a bit more next time. I wish I could get the video from the day before to load, I ran 20 feet longer and spun it out at the end. I appreciate the tip John about throttling back first, it caught me off guard when the wheels stopped and the revs were still up. Im still learning how to run a COM.

 

[olgentdc]

looks like it did ok and par for the course ,.. however the stop, pause,, then re engage jerk! is troublesome ... several things would cause that .. low Fluid , which I doubt in Your CASE ,,.or improper spaceing on the champfer blocks on the clutch assembly ,,. or ,,. and it is very common on a well worn tractor ,, too much slop in the control valves or levers allowing the system to shut down in extreme pulls ,,. either way ,, i dont think you have anything to worry about ..