la271 vs la301

[jonness]

I recently purchased a 1998 Kubota B1700 with 115 hours on it. The tractor is in excellent condition, but I found out B1700 tractors typically come with the la301 loader. My tractor has the la271 loader, which is rated at 65 pounds less lift capacity than the la301.

As you can see in the attached jpeg, the cylinders, bucket, etc. appear to be the same, but the relief valve setting pressure is different between the 271 and 301. Also, the weight is different. Does anyone know if the difference in the specs is due to the control valve, some other hardware, or just some sort of adjustment?

What is it about the la271 that makes it lighter duty than the la301?

Thanks

 

[85Hokie]

Looking at the specs -

The B7300 model came typically with the la271. The 7300 was a little smaller tractor than the B1700 in engine and overall capacity across the board.

the bucket is a little lighter, but the real story is the pressure. If you were to bump that relief spring up a couple of thousand, I think you would see it pick up 10% more.

Your call, but it would be an easy fix, looking at the WSM.

http://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor Owners Manuals/


On the BX series tractors, it is a very simple fix and the differences are noticeable.

 

[jonness]

I see two relief valves that can be adjusted (besides the one for the power steering). One is under the seat and is spec'd at 1920 to 1991 psi. I'm thinking this adjusts the pressure for the 3 point? The other is in the hydraulic control valve for the FEL. This is spec'd at 1900 to 2000 for the LA271 loader and 2100 to 2200 for the LA301.

Are these systems independent of each other, such that I can adjust the relief spring under the seat to 1991 psi and adjust the relieve spring on the loader to 2200 psi without one system affecting the other?

Thanks!

 

[jonness]

Update:

I found the parts manuals for the LA271 and the LA301. The frame, loader, boom, bucket, cylinders, etc are the exact same part numbers. There are some minor differences in a few ancillary hydraulic part numbers, but when I looked up the parts they superseded to, both loaders resolved to the same new part numbers. The difference between the LA271 and the LA301 is literally the stickers on the side.

(Note: The LA272 and LA302 are also the same as each other.)

As I learned in this thread, what matters, in this particular application, is the pressure being ran through the hydraulic lines. So setting the pressure to b1700 spec yields the same performance with both loaders. Given the info in this thread, it's safe to set the b1700 at 10% above max spec when using either the la271 or la301 buckets. This safely increases the max lift of the LA271 from 595 lbs to 725 lbs and increases the LA301 from 660 lbs to 725 lbs.

Now that's more like it!

 

[North Idaho Wolfman]

Are these systems independent of each other, such that I can adjust the relief spring under the seat to 1991 psi and adjust the relieve spring on the loader to 2200 psi without one system affecting the other?

Thanks!

No they are not Independent they use the same pump and piping, but they can be set to different pressures as long as the first is the higher.