Kubota L35 big mistake on hydraulic loader valve looking for advice.

[PoTreeBoy]

That cant be right. Without a inlet relief on the loader valve people could/would fry the pump in everyday loader use.

Dan

The L35 is a plumber's nightmare. The fluid goes from the front pump back to the relief on the 3ph, then back up to the loader.

 

[TheOldHokie]

The L35 is a plumber's nightmare. The fluid goes from the front pump back to the relief on the 3ph, then back up to the loader.

I was pretty sure of that. Kubota did and still does use that routing on a lot of machines. I looked the L35 schematics over about a year ago and its an "interesting" design. Lots of levers to keep organized

Dan

 

[PoTreeBoy]

I assumex the blocked neutral just blew every thing on the bottom out. But if the bucket spool is shifted to "slow extend" the blocked tank core will see roghly 1.5 times inlet pressure so jaybe tgats what happened. What is tractor side relief set to and whats the rated max on the valve?

Dan

The relief is set at 2489 to 2560 psi and the valve is rated at 3000. I don't see a spec on the tank passage. I didn't think about the multiplication effect.

 

[TheOldHokie]

The relief is set at 2489 to 2560 psi and the valve is rated at 3000. I don't see a spec on the tank passage. I didn't think about the multiplication effect.

The tank port limit is going to be 500/600 PSI but thats not a burst pressure. The old grey iron in those valves is probably getting tired and this was a straw too much...

Dan

EDIT

 

[TheOldHokie]

The relief is set at 2489 to 2560 psi and the valve is rated at 3000. I don't see a spec on the tank passage. I didn't think about the multiplication effect.

BTW - you may not have considered the multiplication factor but you picked up on it immediatly. I also didnt think it completely through Since the boom is a serial circuit commanding lift at the same time as commanding dump multiplies pressure twice :

2500 PSI x 1.5 x 1.5 = 5625 PSJ

Youser!!

Dan