Bluegill2
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Well, I don't understand HST, so I'll just watch and listen on this one.
I Still Hate My Tractor
- Thread starter The Fred
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sd455dan
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Fred I think you will be fine- just confirming Kubota's opening point for that intake valve using a confirmed TDC and the degree wheel with a dial indicator on #1 intake valve in the direction of crank rotation...
The fact that your leak down test confirms low leak down- and that the cranking compression is below norms could point to the cam being installed- out of its ""normal installed" position...
OH and next time you do a comp test open the intake manifold up by removing the air cleaner from the system- would hope the air cleaner filter isn't wrapped in plastic or been wet or anything.
I think you will get this figured out- and I also believe something is up with the engine...
The fact that your leak down test confirms low leak down- and that the cranking compression is below norms could point to the cam being installed- out of its ""normal installed" position...
OH and next time you do a comp test open the intake manifold up by removing the air cleaner from the system- would hope the air cleaner filter isn't wrapped in plastic or been wet or anything.
I think you will get this figured out- and I also believe something is up with the engine...
The dealer dynoed the tractor and it was fine. I would say the cam timing is fine.
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Midniteoyl
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They said they did..
TripleR
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Well, I don't understand HST, so I'll just watch and listen on this one.
Well having an HST sure ain't helping me, so we'll both be watching and listening.:laughing:
ovrszd
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Yep Don. HST takes a LOT of power. In an attempt to offer many HP ranges in the same basic model, Kubota has went too far. For most operators they won't know the difference. My Brother included. I've owned both, HST and gear models. My L4400DT was the same basic chassis size as my Brother's L3240. No comparison beyond that. It would do more work at an idle than his does at half throttle.
If you own a L3240HST or L3540HST or even L3940HST and are happy with it's power, I'm happy for you!!!
ddb123
Platinum Member
Yep Don. HST takes a LOT of power. In an attempt to offer many HP ranges in the same basic model, Kubota has went too far. For most operators they won't know the difference. My Brother included. I've owned both, HST and gear models. My L4400DT was the same basic chassis size as my Brother's L3240. No comparison beyond that. It would do more work at an idle than his does at half throttle. If you own a L3240HST or L3540HST or even L3940HST and are happy with it's power, I'm happy for you!!!
I had an L4300 gear and now have an L3540 HST. My HST tractor has 10 fewer hp, 4wd, and weighs 2,000 lbs more than the gear did, and will spin all 4 tires at 1800 RPM or more. It gets the power to the ground. It will go up my steepest slope at idle. That said, I do notice similar symptoms to what Fred and OVRSZD describe if going uphill kinda fast in M range and operating the loader at the same time. The tractor will not stall, but ground speed slows and the engine loses RPMs. At typically slow working speeds, including loader usage or mowing, the HST has no such symptoms. If I'm trying to race up my hill and operate the loader at the same time, no question the gear was better. For my purposes the heavier HST machine is the hands-down preferred tractor.
Chilly807
Elite Member
I think I'm subscribing at just the right time...
If the dealer did the dyno test as they said, this is more about what a turbo will do for a 3940 than about correcting a problem.
Any chance there's an exhaust restriction? That will do the same thing as starving for air, at least power-wise.
Sean
If the dealer did the dyno test as they said, this is more about what a turbo will do for a 3940 than about correcting a problem.
Any chance there's an exhaust restriction? That will do the same thing as starving for air, at least power-wise.
Sean
I would increase the timing to at least 21*. Any of these high speed diesels need advanced timing because they have no mechanical advance. I guarantee you will notice a huge increase in performance. 17* is very retarded for this style engine.
He said they did. I'm not sure why this was not mentioned in his first thread.
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buickanddeere
Super Member
I agree. All this will be is a sick engine with a turbo on it. The dyno story is suspect.
the old grind
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We have to remember that Fred has the cab, heater, AC, whatever comes with that... so even more weight to lug vs other HST L3940s, and must've made the power loss more noticeable. Bra-vo for the thorough testing/reporting. :thumbsup:
The times I had big power drops was when I had the 3PH's feedback lever out of adjustment. Say when moving snow, I'd feel the engine bog & drop 4 or 5 hundred rpm if raising the FEL while moving. I be reminded to lower the BB that smidge until ti; I could hear the load come off the motor, and my hydraulics weren't working the motor more while in bypass. Bog would be gone and I'd be scooting again with but a hundred or two less rpm vs twice that otherwise. Just sayin' ... and Fred's covering a lot of bases.... btw: I still keep a lift lever down slightly from the top stop after gaining the habit.
The times I had big power drops was when I had the 3PH's feedback lever out of adjustment. Say when moving snow, I'd feel the engine bog & drop 4 or 5 hundred rpm if raising the FEL while moving. I be reminded to lower the BB that smidge until ti; I could hear the load come off the motor, and my hydraulics weren't working the motor more while in bypass. Bog would be gone and I'd be scooting again with but a hundred or two less rpm vs twice that otherwise. Just sayin' ... and Fred's covering a lot of bases.... btw: I still keep a lift lever down slightly from the top stop after gaining the habit.
Chilly807
Elite Member
That's another couple of issues.. he's got the hydraulic pressure increased to 3000 psi, which shouldn't be a problem unless something is forcing it to go over the relief valve, or the hydraulics are being used heavily. Maybe the feedback rod is mis-adjusted too? Another member is having that problem now as well.
Plus the weight of the cab, AC running, HST losses, etc. Have to keep in mind there's not a lot of power to begin with, every thing eats a little bit.
A friend of mine had a 3240, he found it was a bit light on power for the size of the machine, although he had a 'hoe attached to his.
Sean
Plus the weight of the cab, AC running, HST losses, etc. Have to keep in mind there's not a lot of power to begin with, every thing eats a little bit.
A friend of mine had a 3240, he found it was a bit light on power for the size of the machine, although he had a 'hoe attached to his.
Sean
nybirdman
Super Member
I found exactly the same on my L4240......after three trips to the dealer,the district rep came up with this solution.Just out of adjustment,at least I know what it is now.We have to remember that Fred has the cab, heater, AC, whatever comes with that... so even more weight to lug vs other HST L3940s, and must've made the power loss more noticeable. Bra-vo for the thorough testing/reporting. :thumbsup:
The times I had big power drops was when I had the 3PH's feedback lever out of adjustment. Say when moving snow, I'd feel the engine bog & drop 4 or 5 hundred rpm if raising the FEL while moving. I be reminded to lower the BB that smidge until ti; I could hear the load come off the motor, and my hydraulics weren't working the motor more while in bypass. Bog would be gone and I'd be scooting again with but a hundred or two less rpm vs twice that otherwise. Just sayin' ... and Fred's covering a lot of bases.... btw: I still keep a lift lever down slightly from the top stop after gaining the habit.
Chilly807
Elite Member
Are you saying they didn't adjust it, and you still can't move the lever to the fully raised position? It's a fairly easy adjustment to make.
The one I mentioned was an mx5100 in Texas, I think it was..
It really surprises me to see this, it's not hard to get it right before it leaves the factory. I played with mine a bit while I was working on the 3-point valve, ended up leaving it pretty much exactly where it was to begin with. About an inch or two of free travel at the top of the range of motion, measured at the end of the lower arms.
I would think the higher capacity pumps on the GL series would put more load on the engine than mine, especially if the hydraulic relief pressure had been increased to 3000 psi.
Sean
s219
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I'd be surprised if any tractor dealership had the capability to dyno a tractor engine properly. I would have asked to see their dyno and the test results. I bet it was a butt-dyno from some lazy employee who doesn't care and just wanted the customer off his back. What's next, will the dealer offer to test something in their tractor lab?
Bluegill2
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I've thought from the beginning something wasn't right with the hydraulics.
The dyno story doesn't hold water either.
Too much stuff goin on here!
The dyno story doesn't hold water either.
Too much stuff goin on here!
OP
The Fred
Veteran Member
The 3PH upper limit seems set correctly, the engine quits laboring when it gets to the high point. I had this happen on my other tractor (the good one) one time while I fooled with that adjustment to get my woodchipper higher off the ground for transport. I went a little to far and the hydraulic system went into relief, you could hear the engine laboring badly. I'm well aware of the sound/feeling when this happens.
Dealer DID tell me that the smaller tractors are hard to dyno because their PTO dyno is a larger one. Either way I feel I am on the right track with the turbo thing. It's a no brainer. The power should go up to just under 60hp. which still could be marginal.
Back to the milling machine, Fred
Dealer DID tell me that the smaller tractors are hard to dyno because their PTO dyno is a larger one. Either way I feel I am on the right track with the turbo thing. It's a no brainer. The power should go up to just under 60hp. which still could be marginal.
Back to the milling machine, Fred
Midniteoyl
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It was prolly dyno'd at the factory and they were reading from the dyno sheet.. Dunno
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