Hydraulic Flow Meter

[Mgray]

I just got my WSM for my Kubota B2710 and was reading about the diagnostics for a hydraulic problem that I have. It calls for a flow meter "Code No: 07916-52792". I Googled that and several combinations of it and got nothing. What I found for the "Hydraulic Flow Meter" search wasn't much help either. There are lots of meters out there and what I've found starts at around $300 and doesn't check everything I want it to anyway. I want something that measures: Flow (6.1 U.S. Gal/Min), Pressure (1991 psi), and Temperature (122 F), and of course I don't want to spend a fortune on it. If I can't find what I need I may just have to start taking things apart and inspecting them visually.

Any recommendations?

Thanks
Mark

 

[montejw]

I just got my WSM for my Kubota B2710 and was reading about the diagnostics for a hydraulic problem that I have. It calls for a flow meter "Code No: 07916-52792". I Googled that and several combinations of it and got nothing. What I found for the "Hydraulic Flow Meter" search wasn't much help either. There are lots of meters out there and what I've found starts at around $300 and doesn't check everything I want it to anyway. I want something that measures: Flow (6.1 U.S. Gal/Min), Pressure (1991 psi), and Temperature (122 F), and of course I don't want to spend a fortune on it. If I can't find what I need I may just have to start taking things apart and inspecting them visually.

Any recommendations?

Thanks
Mark

I was looking for one too, found some for about $150, but didn't bookmark it. Don't try to get something that does it all. A flow meter is $150, pressure guage is less than $20, you can use your hands on the return line from the pump to guage temperature, free. Just hook up the flow meter and pressure guage to "tee's" with quick disconnects and plug them into the circuit somewhere. I've got a pressure guage in the pressure line into the loader control valve, that gives me the cutoff pressure for that relief valve.

Monte

 

[RickB]

Disassembling hydraulic components and inspecting them instead of using a flow meter is a fool's errand. If you want (need?) a flow meter, be prepard to spend upwards of $300 for a unit capable of metering up to 30 GPM or so with a needle valve and pressure gauge. An infrared non-contact thermometer can substitute for a flow meter with integral thermometer. When at the dealership I assembled a "beater" meter for the service truck with components purchased from Baum Iron or Hy-Capacity, I forget which.

 

[diyDave]

I got my flow meter at an auction for $140.00. It is an IH meter made by OTC-they made most of them for the farm dealers. You might want to check and see if a tool dealer local to you carries OTC(Ottawanna Tool Co). Mine doesn't have a temp gauge, but you could always use an infra red thermometer to check temps. If you were local to me I'd let you use mine.

 

[Mgray]

Disassembling hydraulic components and inspecting them instead of using a flow meter is a fool's errand.

I am glad to hear you say that because I have a "tool" problem and I didn't know if I was looking at this as an opportunity to get another tool or if it was something I really needed. The local dealership said it could be as much as $1100 to fix my problem so I guess $300 on diagnostic equipment is justifiable.

The way I see it is if it costs $100 to fix and $100 to buy the tools and parts you need to fix it, then fix it yourself because the next time something like that happens, then you'll already have the necessary tools. The only problem is that this may be a one time type of repair.

The problem that caused me to start looking for a flow meter is that my 3 point hitch won't raise when there is a load on it and it raises very slowly without a load. You can read all about it on this post below.

http://www.tractorbynet.com/forums/parts-repairs/43942-b2710-3-ph-not-raising.html

The description of the problem matches mine exactly but that doesn't mean that the same symptoms are caused by the same problem. The fix for the problem involves a bit of work that I'd like to avoid if it isn't the problem.

Thanks
Mark

 

[638]

I have to ask. Will the TPH hold a load up, or does it drift down rather fast? If it drifts down fast, then the problem could be TPH cylinder seals. Do the rest of the hydraulics work as fast and as strong as they used to? If so, then the pump is probably OK. If pump is OK, and TPH holds a load, then I would look for worn linkage on the TPH valve or maybe the valve it self. If you stop and think about the system and what part of it works and what part doesen't work right, you might not need a flow meter.

ron

 

[Mgray]

Will the TPH hold a load up, or does it drift down rather fast?

The TPH will lift without a load on it. If I close the valve that controls how fast an implement drops then the bars will remain in the up position and I can stand on them with no give whatsoever. After reading more of the WSM last night, it seems like the relief valve may be the culprit. If the relief valve is letting the fluid bypass at too low of a pressure, then it won't have the power to lift anything. That may just be wishfull thinking because the relief valve is easy to reach. I guess the pump could not be generating enough pressure which would have the same results.

On a side note, the pump that suppliess the TPH is connected to the pump that supplies the power steering. The power steering seems to be working fine as far as I can tell but then the power steering wouldn't need as much pressure to operate as the TPH would. Even though they are powered from the same source, they are still separate so that might not mean anything anyway.

I think the first thing I need to do is to run a pressure test at the relief valve. That will tell me if enough pressure is actually getting to the TPH cylinder and if the relief valve is letting the fluid bypass at the right pressure. I might see if I could just rent the equipment if it is available.

The one thing I do know is that there is at least some flow. I just don't know where it fails after that.

 

[diyDave]

Always buy the tool-here's why: Once you buy it, that immunizes you from ever having the problem that the tool is used for. Kind of like the second phase of murphy's law.

 

[638]

I have a pressure guage set up on quick disconnects for my BX23. All I have to do is plug it in to any one of the FEL QDs to check max pressure on my machine. I will be in Indy this weekend to visit the kids. If the QDs are the same, we could plug it in for a quick check on your max pressure. Send me a PM, maybe we can get together Saturday and give it a try. The kids live in New Pall. on the SE side of Indy.

ron

 

[Mgray]

I have been busy for the last few weeks but I finally got around to checking a few things on the tractor.

I pulled the suction line that supplies the pump that powers the steering and 3ph. The screen looked absolutely pristine. I went ahead and drained all of the fluid and replaced it at that time. The old fluid looked good to me. I also added a few washers on top of the relief spring to increase the bypass pressure at the relief valve. This made no change in performance at all.

It looks like I am going to have to pull the control valve.

Mark