I Still Hate My Tractor

[aczlan]

Wow, it dropped 100 rpms just by activating the loader hydraulics with no tractor movement and the engine in it's peak torque range (2000 rpm)??? I think yours is worse than Fred's, at least his tractor is moving and operating the loader hydraulics at the same time. Try driving up an incline in mid range half throttle (1500 rpm or less) with a bale on and operate the loader hydraulics.

To make 10GPM (the L3940 aux hydraulics GPM) at 2500PSI takes 17HP. That is 42% of the engine's 40HP. If you have the hydraulics turned up to 3000PSI (as The Fred has done) it takes 21HP, over 50% of the engine's HP.

Aaron Z

 

[ddb123]

TEST RESULTS!

Probably no one is interested in this, but I did it so I'm going to post it. First, it was 18 degrees this morning (got down to 8 last night) and my tractor sits in an unheated shed with three sides and out of the sun. The glow plugs auto-cycle only. They ran for about 10 seconds and the tractor turned over three times and started. It hacked for about two seconds and then ran fine. Throttle was set to about 1100 rpms. I cleared the drive for about 30 minutes so it was warmed up, then I went to my steepest navigable hill.

The range shifter was in MED-Rabbit. For reference, top speed in this range and setting is 7.4 mph. Auto H-DS was set to OFF. In each instance I climbed the hill with the hydro pedal mashed to the floor and operated only dual functions of the loader.

1500 RPM: as soon as I took off, dropped to 1400, then dropped to about 1200 with loader operation added in.
1700 RPM: dropped to 1600 at GO, then to about 1300 with loader added in.
1800 RPM: dropped to 1700, then about 1450-1500.
2000 RPM: dropped to 1800, then 1600.
2400 RPM: dropped to 2200, then 1900.

So it dropped more the higher the revs were. Of course, my speed was a lot faster with higher revs, too. I then tried it in MED-Turtle. Top speed in this range is 4.4 mph.

1500 RPM: dropped to 1400, then 1300.
1800 RPM: dropped to 1700, then 1600.
2000 RPM: dropped to 1800 and stayed.
2400 RPM: dropped to 2200 and stayed.

Just for kicks, I put the range shifter in LOW-Rabbit. The top speed in this range is 3.6 mph.
1500 RPM: dropped to 1400 and stayed.
1800 RPM: dropped to 1700 and stayed.
2000 RPM: no drop, no drop.
2400 RPM: no drop, no drop.

I usually putt around the yard in MED-Rabbit with the revs anywhere from 1500-1800. I expect some change in engine note from idle (no load) to moving/working (under load).

I think something huge that is being overlooked here is that MED-Rabbit has a top speed that exceeds 10th gear on the GST model or 2nd-High on the manual shift model (both of those have a top speed of 6.9 mph). I don't think anyone would put their GST in 10th or 11th gear and try to crawl up a steep hill while working the loader at half throttle where the engine is only making a portion of its rated hp. Yes, the HST pump is variable but the main gear it is driving isn't.

 

[ddb123]

I forgot to add that I performed the same tests on level ground and the engine never dropped more than 100 rpms in any instance, in case anyone is curious.

 

[kuboman]

I forgot to add that I performed the same tests on level ground and the engine never dropped more than 100 rpms in any instance, in case anyone is curious.

Interesting, I've had similar experience with a L3130. In med range going up a steep hill with loader and counter weight if I operated the loader the tractor would die in a cloud of black smoke. And I mean die!

 

[Bluegill2]

Interesting, I've had similar experience with a L3130. In med range going up a steep hill with loader and counter weight if I operated the loader the tractor would die in a cloud of black smoke. And I mean die!

See, I really don't understand this?

 

[ovrszd]

To make 10GPM (the L3940 aux hydraulics GPM) at 2500PSI takes 17HP. That is 42% of the engine's 40HP. If you have the hydraulics turned up to 3000PSI (as The Fred has done) it takes 21HP, over 50% of the engine's HP.

Aaron Z

Good information Aaron. I would have never guessed that. Explains why a smaller displacement/HP engine suffers more from hydraulic use.

 

[ovrszd]

I forgot to add that I performed the same tests on level ground and the engine never dropped more than 100 rpms in any instance, in case anyone is curious.

I for one was very curious!!!! Saved me from getting out in the cold to run tests on my Brother's L3240. Thank you very much for this information. Is very useable information for Fred to compare his results to.

 

[ddb123]

Interesting, I've had similar experience with a L3130. In med range going up a steep hill with loader and counter weight if I operated the loader the tractor would die in a cloud of black smoke. And I mean die!

See, I really don't understand this?

I agree. I didn't mean that my tractor nearly stalled; it never came close to stalling and ground speed barely slowed. Something doesn't seem right if your tractor dies that way. Although I was reading a thread the other day about DK40/45 owners stalling their tractors while using the loader and NO I'M NOT KNOCKING KIOTI TRACTORS! I just didn't know it was possible to stall a tractor using hydraulics -- I figured the relief would kick in and save the day before that would happen

 

[ericher69]

No reply from OP in how many posts...

 

[murphy1244]

No reply from OP in how many posts...

Said he had enough of this group. Gone with the wind.