Kubota l2501 throttle adjustment screw.

Status
Not open for further replies.
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
One thing that confuses me, is why would there be a rated (2600) PTO RPM marker on the Tachometer, and a maximum (2900rpm) PTO RPM marker 300rpm higher? My machine revs just over 2700rpm maxed out.
Any ideas on that?
Does the L2501 have something similar?

 
Last edited:
North Idaho Wolfman

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
30,224
6,390
113
Sandpoint, ID
SRG said:
One thing that confuses me, is why would there be a rated (2600) PTO RPM marker on the Tachometer, and a maximum (2900rpm) PTO RPM marker 300rpm higher? My machine revs just over 2700rpm maxed out.
Any ideas on that?
Does the L2501 have something similar?
Click to expand...
What model tractor is that dash on?
 
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
NIW, that is the dash of my 870.


Rdrett, apologies for jacking your thread, but I felt it was along the same lines of info you are looking for.
 
R

Rdrett

Member
Dec 5, 2017
222
8
18
Paris Ky
SRG said:
NIW, that is the dash of my 870.


Rdrett, apologies for jacking your thread, but I felt it was along the same lines of info you are looking for.
Click to expand...


No problem.
Mine doesn’t have the max and rated.
If I had your machine I would have no problem turning up the rpm to 2900 rpm.
It clearly says 2900 max so I would crank it up.
I am going to do some more research and if I find that the kubota d1703 max is 2800 I will crank it up.
2400 rpm is to low.

I do understand that two motors being identical are ran under the exact same load one run at 2400 rpm and one running at 2800 rpm the one running lower rpm will probably run longer but I don’t plan on running it 2800 rpm 100% of the time.
I will only run it at 2800 less than 10% of the time. And it may be useful to have the extra revs when I get myself in a bad situation.

Like when I set a field on fire. I could of used the extra revs then.


Thanks again for the help.
 

Attachments

R

RCW

Well-known member
Lifetime Member

Equipment
BX2360, FEL, MMM, BX2750D snowblower. 1953 Minneapolis Moline ZAU
Apr 28, 2013
9,159
5,253
113
Chenango County, NY
SRG said:
One thing that confuses me, is why would there be a rated (2600) PTO RPM marker on the Tachometer, and a maximum (2900rpm) PTO RPM marker 300rpm higher? My machine revs just over 2700rpm maxed out.
Any ideas on that?
Does the L2501 have something similar?
Click to expand...
SRG --

I'm guessing the "MAX" marker is what we used to call the "Red Line" for max engine RPM?

I know I tickled a few Red Lines on Rice-burner motorcycles.....::p:eek:
 
Last edited:
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
RCW said:
SRG --

I'm guessing the "MAX" marker is what we used to call the "Red Line" for max engine RPM?

I know I tickled a few Red Lines on Rice-burner motorcycles.....::p:eek:
Click to expand...
I thought so too maybe. But, why is it PTO related, with the PTO symbol? I wouldn't think the engines max RPM would have that symbol.
 
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
Rdrett said:
http://www.orangetractortalks.com/forums/attachment.php?attachmentid=41716&stc=1&d=1553360776

No problem.
Mine doesn’t have the max and rated.
If I had your machine I would have no problem turning up the rpm to 2900 rpm.
It clearly says 2900 max so I would crank it up.
I am going to do some more research and if I find that the kubota d1703 max is 2800 I will crank it up.
2400 rpm is to low.

I do understand that two motors being identical are ran under the exact same load one run at 2400 rpm and one running at 2800 rpm the one running lower rpm will probably run longer but I don’t plan on running it 2800 rpm 100% of the time.
I will only run it at 2800 less than 10% of the time. And it may be useful to have the extra revs when I get myself in a bad situation.

Like when I set a field on fire. I could of used the extra revs then.


Thanks again for the help.
Click to expand...
I gotta do a little more digging myself, before i start playing with it.
Any luck on finding camshaft info?
 
JerryMT

JerryMT

Active member

Equipment
Kubota M4500, NH TD95D,Ford 4610
Jun 17, 2017
528
156
43
The Palouse - North Idaho
Rdrett said:
SRG.
Thanks for the reply. I forgot to check the camshaft. I will look into that.

Here are some Information I found online about the d1703 engine.

KUBOTA
D1703 KUBOTA

HORSEPOWER : 17.2-30 HP SPEED : 1500-2800 RPMTYPE : DIESEL
Horsepower: 30
Low Noise
Featuring a built-in solenoid, low fan position and single side serviceability, the Kubota D1703 offers powerful performance, exceptional reliability and a long service life to meet almost any application.

My kubota l2501 max rpm is 2,400 rpm. Which is very low and why I kept yanking on the throttle lever when I first got it.
The d1703 engine is rated to run between 1500-2800 rpm.
I am positive I can turn the engine up to 2,800 rpm without any negative The Kubota D1703 is a vertical, water-cooled, 4-cycle diesel engine with a capacity of 30HP at 2800RPM. effects on the engine.
Just because I turn it up to 2,800 rpm doesn***8217;t mean I am going to run it 100% of the time at 2,800.
The only time I will run it up to 2,800 rpm is when I travel on the road or need to dig myself out of a hole.

I will most likely set max rpm at 2,600 at test from there.
Click to expand...

The Kubota D1703 is a vertical, water-cooled, 4-cycle diesel engine with a capacity of 30HP at 2800RPM.

IF the engine is rated for 30 hp at 2800 rpm (and it doesn't say "rated" in this sentence, so that's why I bolded the IF) then your machine should be able to achieve this engine rpm under load and have a minimum output of 30hp. That's how engine ratings work. If, under no load conditions (i.e. high idle), you cannot achieve 2800 rpm you need to adjust the stop so you can.
here's some data I found on tractordata.com for the L2501.

I did some looking. http://www.tractordata.com/farm-tractors/008/0/8/8085-kubota-l2501-engine.html This says the engine is rated at 24 HP @2200 rpm. If this is correct (another if) than it seem you are already above rated rpm at 2400.
 
Last edited:
R

RCW

Well-known member
Lifetime Member

Equipment
BX2360, FEL, MMM, BX2750D snowblower. 1953 Minneapolis Moline ZAU
Apr 28, 2013
9,159
5,253
113
Chenango County, NY
SRG said:
I thought so too maybe. But, why is it PTO related, with the PTO symbol? I wouldn't think the engines max RPM would have that symbol.
Click to expand...
Hmmm... looked at it again. Not sure if it's PTO or not.

I see what you're saying with the 2 PTO symbols...

My experience with JD are a Styled B circa 1940, and a 1996 425 Garden Tractor.

Your 870 is Asian or European, if my memory serves.... I'm honestly not sure what the heck they were trying to say with that indicator! :( I'm wondering if that was their attempt at a Red Line and it was confused in the "translation" or presentation on the dash?!?! I don't know - just guessing..

Like I said before, I know that some of Asian manufacturers knew how to put an honest "red line" on their motorcycles..
 
Last edited:
mdhughes

mdhughes

Well-known member
Lifetime Member

Equipment
L3901DT
Dec 10, 2014
1,252
722
113
Ste Geneveive county, MO
Rdrett, have you looked at the torque and HP chart for the engine? If I was looking at the right on, you will lose torque if you up the RPMs. And if I figured right, if you up the RPMs by 400, will will add just about 1 MPH in high gear.
 
R

Rdrett

Member
Dec 5, 2017
222
8
18
Paris Ky
JerryMT said:
The Kubota D1703 is a vertical, water-cooled, 4-cycle diesel engine with a capacity of 30HP at 2800RPM.

IF the engine is rated for 30 hp at 2800 rpm (and it doesn't say "rated" in this sentence, so that's why I bolded the IF) then your machine should be able to achieve this engine rpm under load and have a minimum output of 30hp. That's how engine ratings work. If, under no load conditions (i.e. high idle), you cannot achieve 2800 rpm you need to adjust the stop so you can.
here's some data I found on tractordata.com for the L2501.

I did some looking. http://www.tractordata.com/farm-tractors/008/0/8/8085-kubota-l2501-engine.html This says the engine is rated at 24 HP @2200 rpm. If this is correct (another if) than it seem you are already above rated rpm at 2400.
Click to expand...
2400 rpm is where it was set at from the factory.
2400 rpm with no load. Add a small load and it drops to 2200 rpm.
 
JerryMT

JerryMT

Active member

Equipment
Kubota M4500, NH TD95D,Ford 4610
Jun 17, 2017
528
156
43
The Palouse - North Idaho
Rdrett said:
2400 rpm is where it was set at from the factory.
2400 rpm with no load. Add a small load and it drops to 2200 rpm.
Click to expand...
That's consistent with the info from tractordata.com. that's called speed droop and is meant to keep the engine within limits.

Where did the 30 hp come from?
 
Last edited:
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
RCW said:
Hmmm... looked at it again. Not sure if it's PTO or not.

I see what you're saying with the 2 PTO symbols...

My experience with JD are a Styled B circa 1940, and a 1996 425 Garden Tractor.

Your 870 is Asian or European, if my memory serves.... I'm honestly not sure what the heck they were trying to say with that indicator! :( I'm wondering if that was their attempt at a Red Line and it was confused in the "translation" or presentation on the dash?!?! I don't know - just guessing..

Like I said before, I know that some of Asian manufacturers knew how to put an honest "red line" on their motorcycles..
Click to expand...
It's built in Japan. It's technically a Yanmar, built for John Deere, by Yanmar.
The 3TN84 (when in the 870) has a governed/limited high idle RPM, of 2750-2800rpm, I'd think that would be where the "redline" would be, if it were marked, maybe(?). Looking back at the second PTO MAX marker, it actually appears to be 2950rpm, judging by the spacing of hashmarks.
It's confusing. Could it be the no load PTO rpm is MAX, and the loaded rpm is RATED?
 
Last edited:
R

Rdrett

Member
Dec 5, 2017
222
8
18
Paris Ky
JerryMT said:
That's consistent with the info from tractordata.com. that's called speed droop and is meant to keep the engine within limits.

Where did the 30 hp come from?
Click to expand...
I got it from the kubota d1703 Service manual.

ISO Net Continuous: (28.4 HP / 2800 min-1 (rpm)
SO/SAE Net Intermittent: (32.7 HP / 2800 min-1 (rpm)
SAE Gross Intermittent: (35.0 HP / 2800 min-1 (rpm)
Maximum Bare Speed: 3020 min-1 (rpm)
Minimum Bare Idling Speed: 750 to 850 min-1 (rpm)
 
S

SRG

New member

Equipment
B8200D 4WD........ JD 870, FWA, 300x FEL.......... JD 797, 72" Z-Trak
Jul 15, 2017
490
3
0
N. IL
Rdrett said:
I got it from the kubota d1703 Service manual.

ISO Net Continuous: (28.4 HP / 2800 min-1 (rpm)
SO/SAE Net Intermittent: (32.7 HP / 2800 min-1 (rpm)
SAE Gross Intermittent: (35.0 HP / 2800 min-1 (rpm)
Maximum Bare Speed: 3020 min-1 (rpm)
Minimum Bare Idling Speed: 750 to 850 min-1 (rpm)
Click to expand...
Any idea what the min-1 (rpm), means?
 
R

Russell King

Well-known member
Lifetime Member

Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Jun 17, 2012
5,368
1,416
113
Austin, Texas
SRG said:
Any idea what the min-1 (rpm), means?
Click to expand...
Yes that is one way to state “per minute”

The Max pto your dash shows is just a limit on engine speed to limit the pto to some rpm. Rated would get 540, max would get something like 550 to 575 rpm

That is what I think anyway


Sent from my iPad using Tapatalk
 
B

Big Gee Tn

New member

Equipment
L2501
Dec 12, 2018
40
0
0
White Pine,tn
Member by the name Joel K -has did the same as what you are wanting to do and he boosted hydraulic pressure too.Look at some of the older post.Just for the record I'm gonna do the same thing when warranty has expired.
 
Status
Not open for further replies.

Top Bottom