L1500 fuel injection

[Kevin.shea]

I'm having a issue with this project tractor. It has been setting a few years without any fuel. The guy I got it from said he replaced the return spring for the throttle. It looks to me that at some point the whole front cover was taken off. Anyway I went to bleed the fuel to the injectors and got nothing to the fuel injectors. Out of curiosity I pulled the cover and there is a plunger, I'm assuming it is for the rack. If I take a screw driver and push it forward, I can get fuel to the injectors and it will run. But as soon as I let off of it it shuts down. Before I take the front cover off can some one let me know what to look for? Obviously the last guy didn't put it together right.

 

[North Idaho Wolfman]

You don't need to remove the front cover.
Is the fuel injector rack pin in the slot of the governor arm?
All of that is seen from the cover you have off on the side.
If the rack pin is not in the arm remove the four bolts that hold the pump down pick it up and align the pin to the slot.

 

[Kevin.shea]

You don't need to remove the front cover.
Is the fuel injector rack pin in the slot of the governor arm?
All of that is seen from the cover you have off on the side.
If the rack pin is not in the arm remove the four bolts that hold the pump down pick it up and align the pin to the slot.

View attachment 103026

View attachment 103025

The rack pin and arm both move together so I'm thinking that they are together right. One thing I did find was that the fuel limit stop was ran all the way in. Also is there a noticeable difference between the governor spring and the throttle spring? They look to be the exact same on my tractor. I have the shop manual for it but the diagrams are not very clear. And I'm not sure which one goes to the stud on the case and wich one goes on the throttle.

 

[North Idaho Wolfman]

Give me a pic of your " governor spring" (which is the start spring).
It should be a very light weight spring.
The start spring connects to a pin inside the gear case accessible from under the throttle control plate.

 

[Kevin.shea]

Give me a pic of your " governor spring" (which is the start spring).
It should be a very light weight spring.
The start spring connects to a pin inside the gear case accessible from under the throttle control plate.

View attachment 103062

Both springs,

 

[North Idaho Wolfman]

Yea that's the wrong spring for start.

Right spring:

Kubota #15221-56480 SPRING, START

SPRING, START

www.messicks.com

 

[Kevin.shea]

Yea that's the wrong spring for start.

Right spring:

Kubota #15221-56480 SPRING, START

SPRING, START

www.messicks.com

Yea that's the wrong spring for start.

Right spring:

Kubota #15221-56480 SPRING, START

SPRING, START

www.messicks.com

Thanks, just ordered the spring.

 

[Kevin.shea]

Thanks, just ordered the spring.

Ok, the spring came in and I installed it. also I ordered 2 glow plugs. It starts a lot easier, But now it surges at wide open throttle and dies at an idle. while i was at it I checked the compression of the cylinders and the back cylinder is showing about 370 PSI and the front cylinder is showing about 270PSI. from what I have read 327PSI is the lowest it should go before its time for a rebuild? Thoughts? engine kit recommendations? is the surging and lower compression related? or separate issues? also it does have low oil pressure. I suspect that the plug in the cam has fallen out but its just a guess right now.

 

[North Idaho Wolfman]

Here is a rebuild Kit:

Overhaul Rebuild Kits STD with Liners for Kubota Z750 Engine L175 L185 L1501 L1500

Overhaul Rebuild Kits STD with Liners for Kubota Z750 Engine L175 L185 L1501 L1500

www.fridayparts.com

Sounds like you may need the injection pump rebuilt, but low compression on a two cylinder can really make things run odd.

I would check the valve lash and run it for a bit and see if it calms down.

 

[Kevin.shea]

Here is a rebuild Kit:

Overhaul Rebuild Kits STD with Liners for Kubota Z750 Engine L175 L185 L1501 L1500

Overhaul Rebuild Kits STD with Liners for Kubota Z750 Engine L175 L185 L1501 L1500

www.fridayparts.com

Sounds like you may need the injection pump rebuilt, but low compression on a two cylinder can really make things run odd.

I would check the valve lash and run it for a bit and see if it calms down.

Ok, I guess YOUTUBE is your friend. I have been looking at a lot of post on YT, There is a guy in Washington who did a post on low oil pressure and it just so happened that he had the throttle cover off his tractor. well some time in the past someone thought it was a good idea to put a spring on the Max fuel limit stop. so i took mine back apart and removed the spring. low and behold it starts and idles like a champ revs up to about 2100 RPM and no more surging. Its still got work to be done on it, the low oil pressure is concerning, and I think ill tear into that next. after i figure that out i think i will run another compression check on it. From what i have been told by the guy who had it before me it hasn't been run since 2009.

 

[North Idaho Wolfman]

Ok, I guess YOUTUBE is your friend. I have been looking at a lot of post on YT, There is a guy in Washington who did a post on low oil pressure and it just so happened that he had the throttle cover off his tractor. well some time in the past someone thought it was a good idea to put a spring on the Max fuel limit stop. so i took mine back apart and removed the spring. low and behold it starts and idles like a champ revs up to about 2100 RPM and no more surging. Its still got work to be done on it, the low oil pressure is concerning, and I think ill tear into that next. after i figure that out i think i will run another compression check on it. From what i have been told by the guy who had it before me it hasn't been run since 2009.

What PSI oil pressure are you getting?
And are you measuring it with a mechanical gauge?