I have two skid steers; a 2010 Bobcat S150 and a 2011 John Deere 323D With the bobcat, you can operate with a low throttle. The lower the throttle the slower it moves but it does not complain With the 323D, it needs 50+% throttle to do anything. Any less than that and it really strains and complains loudly in the form of an non enough power noise. The 323D has a much more powerful motor. Comparing the two, I can't help but wonder if there is not something wrong with the 323D I have not used another 323D so I don't have anything to compare it against. Anyone else have a 323D and experience the same?
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It could be an issue with the machine, i have found my S150 runs great at 50 or so % throttle, i believe just about any machine should run fine at lower speeds, just slower.
Is the JD turbo charged? i wonder if it could be that there isn't enough revs to spool the turbo, so you aren't getting enough air/fuel to give you the power needed.
Is the JD turbo charged? i wonder if it could be that there isn't enough revs to spool the turbo, so you aren't getting enough air/fuel to give you the power needed.
The 323D has a 69HP, 192ft lbs torque, Turbo Diesel. .
My S150 has a 46.1HP @ 109ftlbs torque, no turbo. .
I can't say I have noticed the sound of the turbo.....its a fairly load tractor, especially with the throttle greater than 50%. . Now I'm wondering if the turbo is even spinning. . Unfortunately, I'm off in another state for a while.
Mainly I was just trying to understand if this is normal behavior for the 323D.
Its only been 7 years, but I got around to checking the boost on the 323D. The spec says 2800RPM: 20 PSI Boost
I measured it:
idle/1200RPM: 0 PSI (but not a vacuum)
@ 2800 RPM: 4 PSI (steady)
Any boost at all means the turbo is spinning.... Or could it mean that the Turbo is frozen and there is a exhaust leak path through the turbo and into the intake. I did notice that the intake manifold test port plug had a lot of soft soot on its inside surface
I measured it:
idle/1200RPM: 0 PSI (but not a vacuum)
@ 2800 RPM: 4 PSI (steady)
Any boost at all means the turbo is spinning.... Or could it mean that the Turbo is frozen and there is a exhaust leak path through the turbo and into the intake. I did notice that the intake manifold test port plug had a lot of soft soot on its inside surface
The fan spins freely and smooth. No signs of housing impact. It has no wastegate... instead it has a valve on the path between turbo and inter-cooler. Its wide open. My next step is to pressure test the turbo pathways. Though visually, all looks good.
No error codes. Apparently the machine has a fuel pressure sensor. Since there are no codes, I assume the pressure is not completely out of whack.
It seems to me that if the machine is able to put out 2800 RPMs, then the fuel system and mechanical aspects of the engine should not matter. 2800RPMs of cylinder pressure to the turbo should produce the right pressure or close to it. Exception would be a clogged exhaust or a leaky turbo air pressure path, clogged air filter, or an impaired turbo. I removed the air filter, no difference.
I don't see smoke from the exhaust. I don't hear any missing either. I keep envisioning a crack in the intercooler or something similar. Can't see the back side of the intercooler. Yep, I will pressure test next
It seems to me that if the machine is able to put out 2800 RPMs, then the fuel system and mechanical aspects of the engine should not matter. 2800RPMs of cylinder pressure to the turbo should produce the right pressure or close to it. Exception would be a clogged exhaust or a leaky turbo air pressure path, clogged air filter, or an impaired turbo. I removed the air filter, no difference.
I don't see smoke from the exhaust. I don't hear any missing either. I keep envisioning a crack in the intercooler or something similar. Can't see the back side of the intercooler. Yep, I will pressure test next
ward
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I would test it (the pressure) with the engine under a light load as with no load at 2800 rpm it is still just at idle, exhaust pressure rises under load and hince turbo pressure will increase, semi trucks with turbo pressure gauges see more pressure under load yet no rpm change however the fuel used is raised as it loads, the old 1980s and 1990s trucks you could hear the turbos spool up under load as the semis would hit small grades and hear them let off once they hit the top of the grade.
Here is the section from the manual on testing boost. I had just ignored it as it seemed odd and harsh on the machine. But once the weather improves, I will repeat the boost test.
ward
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If the brakes are out of adjustment or just dont hold when you hit boost you can fully lower the arms (if I recall the arms have a stop when fully lowered) and set the bucket flat and drive agist an in movable object such as a foundation or pole ease up to it till you bump it then start the test.
I just performed the test. 2800RPMs will full forward on both drive sticks in park. Pressure went to 19 PSI. That says the turbo is fine.
There is something very wrong with the machine, it can't even move itself forward at idle. It makes such a horrible laboring sound if you try. I spoke with another 323D owner and he said his could move without issue at idle, although very slowly. If the engine is fine, then it must be hydraulics, I would guess.
I need to measure the hydraulic pressure next.
I noticed that I originally posted this on the Bobcat forum rather than the Deere forum...Not sure why, but I suspect its because there is little posting going on on the deere skidsteer forum
I have created a new post there: https://www.skidsteerforum.com/threads/2011-323d-sick.121831/
There is something very wrong with the machine, it can't even move itself forward at idle. It makes such a horrible laboring sound if you try. I spoke with another 323D owner and he said his could move without issue at idle, although very slowly. If the engine is fine, then it must be hydraulics, I would guess.
I need to measure the hydraulic pressure next.
I noticed that I originally posted this on the Bobcat forum rather than the Deere forum...Not sure why, but I suspect its because there is little posting going on on the deere skidsteer forum
I have created a new post there: https://www.skidsteerforum.com/threads/2011-323d-sick.121831/
Last edited:
ward
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You should not be able to go full stick movement with the unit at full throttle with the brakes set and or up aginst a unmoveable object unless you have a huge bypass in the hydraulic system, full stick should have killed the engine unless the wheels moved, I don't remember if the units had a forward and reverse relief valves however I believe they did and if they have gone bad in forward you may be able to swap them out, I had to do that to a new holland and order new relief valves to get a customer up and running, the reverse were ok as the hardest work is always going forwards, with that said I think a case drain test of the drive pumps and drive motors, is there a way to get an audio of your moving it, as the hydraulics can make a lot of noise that tells you a lot.
