I recently picked up an L235 with an L1200 loader and a 4530B backhoe. Hydraulics were a mess. The machine had been flipped and the main hydraulic pipe was cut and spliced directly to the loader control. Found a used pipe and replaced. The loader still worked fine. The lift arm control valve was set off in the lock position. Turned it on and arms work, but keep floating up and now there is no pressure to the loader. It seems like the control valve is sticking. I do not see a relief valve on the schematic parts. Only 700 hours on the unit with a new hydraulic pump. Any ideas what to clean/disassemble to fix the issue.
"I do not always drive a tractor, but when I do, I prefer Kubota, Stay Orange my friends!"
Newbie here - this is my first go at hydraulics, I just bought a l245dt
My 3pt lift is pretty weak and scouring the wealth of info on OTT, I've flushed the hydro/tranny fluid, replaced hydraulic screen and cleaned out vent tube. It seems better, but still not getting the lift I need for the back blade. I.e. 3 pt lifts when no implement is on, but halts if you put it under weight.
I'm wanting to check the relief valve, but just wanted to check on the process before I pull that plug...can someone give me the lowdown on cleaning that pup? Does it have to be installed at a specific torque?
Thanks and what I've picked up thus far on OTT has me a very serviceable tractor! Thx!
The original pump on the L245 was not overly powerful or speedy. I have a pump on my L185 that was too weak/slow to run the FEL on my L245, but does fine lifting a flail mower or rake. I have pulled the PRVs on all of my machines and tightened them to "just enough" with no issues. My "just enough" is based on what is being held together and size/material. As I remember, you have a couple of o-ring in there. Pull it, clean it out, check that the valve and spring are free, check and/or replace o-rings and snug it back together. If it leaks, tighten it some more. If the lift is still too weak, I would get the pressure out of the pump tested.
I do not always drive tractors, but when I do I prefer to drive Kubota. Stay Orange my friends.
MikeL - thanks for the help. The loader seems to run fine, lifts good and strong - the 3 pt hitch on the other hand is the one that struggles with even light loads. That said, can we assume the pump is putting out sufficient pressure?
Like I said I'm pretty green with hydraulic systems, and associate relief valves with pressure and just wanted to make sure I wasn't going open anything under pressure.
Amaurymsa - one of the great things about this forum seems to be the follow up with solutions. I'll post back my results.
The vent tube on my tractor is right below the seat on my left side (if I was sitting on the tractor). It is a threaded tube that can be removed and cleaned out (recommended on another thread) - mine was full of mud?