L5740 hydraulic add on questions

[cstamm81]

I just picked up a nice L5740-3 with BH92 backhoe. It's clean, has 800 hours, no service history so I will be going through everything this Summer.

First off, are there downloadable manuals floating around anyone could share? I like to get my hands on every service, parts, and operation manual there is for the tractor, hoe, and loader. I also need to know the flow rates through the loader and backhoe valve, I'm assuming they are the same? I'm not sure if I can trust the info on tractordata or not.

It has 2 rear remotes, but no third function or diverter valve for the loader. I'm a big fan of having as many hydraulic capabilities on a tractor as possible. I'd like two valves on the loader, I was originally thinking 1 third function and 1 diverter. My idea was this would give me the ability to run something like a rotatable tree shear on the front. The third function would work great for a grapple, and the diverter for tasks where I might need to feather the hydraulics. Ideally, I'd like the ability to run something with a hydraulic motor on the front end as well, but I don't know if there is enough flow through the loader valve, or if the loader valve or the third function / diverter could handle continuous duty, or if I need a dedicated motor valve to run a hydraulic motor.

I've been looking at Surplus Center for individual parts, Summit Hydraulics: Hydraulic Quick Couplers and Multiplier Valves for kits, and Scorpion X Series control handle with up to four faceplate buttons. for a control handle for as many functions as I could possibly want.

Any advice or threads to share would be greatly appreciated. Thanks in advance.

 

[Smokeydog]

Congratulations on the new tractor and sounds like a good one.

3rd functions are great for cylinders like grapples. But are poor for motors of any appreciable size or continuous duty. Exception being some low flow post hole augers. No case drain or open path back to tank. If the motor has rotational momentum like a cutter it is even more important. Additional heat load to consider. Separate pto hydraulic package would work.

I ran a loader 3rd function from a rear remote on a M5030 for decades with no problems. Depends on where they put the remote handle(s).

 

[Fallon]

I just picked up a nice L5740-3 with BH92 backhoe. It's clean, has 800 hours, no service history so I will be going through everything this Summer.

First off, are there downloadable manuals floating around anyone could share? I like to get my hands on every service, parts, and operation manual there is for the tractor, hoe, and loader. I also need to know the flow rates through the loader and backhoe valve, I'm assuming they are the same? I'm not sure if I can trust the info on tractordata or not.

It has 2 rear remotes, but no third function or diverter valve for the loader. I'm a big fan of having as many hydraulic capabilities on a tractor as possible. I'd like two valves on the loader, I was originally thinking 1 third function and 1 diverter. My idea was this would give me the ability to run something like a rotatable tree shear on the front. The third function would work great for a grapple, and the diverter for tasks where I might need to feather the hydraulics. Ideally, I'd like the ability to run something with a hydraulic motor on the front end as well, but I don't know if there is enough flow through the loader valve, or if the loader valve or the third function / diverter could handle continuous duty, or if I need a dedicated motor valve to run a hydraulic motor.

I've been looking at Surplus Center for individual parts, Summit Hydraulics: Hydraulic Quick Couplers and Multiplier Valves for kits, and Scorpion X Series control handle with up to four faceplate buttons. for a control handle for as many functions as I could possibly want.

Any advice or threads to share would be greatly appreciated. Thanks in advance.

TractorData.com Kubota L574 tractor information just under 10gpm to all hydraulics outside of steering. All that flow goes through 1 power beyond loop. You divert that loop through the hoe when it's plumbed in. Tractordata data is generally pretty accurate. 10gpm is what most CUTs have for flow.

My L4060 has about the same flow. My 3rd function is ok most of the time for the smallest SSQA post hold digger you can get. Don't plan on running to much hydraulic motors like a snowblower or tree cutter. It's fine for plow angle or a grapple though. More than a 3rd function on a CUT loader is a bit unusual. Definitely doable, but I'd recommend nailing your use case down well before you install more than just a 3rd function (true 3rd or a diverter).

Kubotabooks.com may have workshop (WSM) & other manuals.

 

[cstamm81]

Congratulations on the new tractor and sounds like a good one.

3rd functions are great for cylinders like grapples. But are poor for motors of any appreciable size or continuous duty. Exception being some low flow post hole augers. No case drain or open path back to tank. If the motor has rotational momentum like a cutter it is even more important. Additional heat load to consider. Separate pto hydraulic package would work.

I ran a loader 3rd function from a rear remote on a M5030 for decades with no problems. Depends on where they put the remote handle(s).

I'm thinking of adding a separate motor control valve, electric over hydraulic, with a set of continuous switches. Even though I only have a hair under 10 GPM, I still would like the ability to safely run an auger and a sweeper. I may also piece together a hydraulic pto pack, as I already have some of the parts, which could be used for high demand hydraulic implements. Essentially I want the ability to run almost anything.

I have a little Mahindra that I use the rear remote to control a grapple. It's not the best, but I have gotten proficient with it.

 

[cstamm81]

TractorData.com Kubota L574 tractor information just under 10gpm to all hydraulics outside of steering. All that flow goes through 1 power beyond loop. You divert that loop through the hoe when it's plumbed in. Tractordata data is generally pretty accurate. 10gpm is what most CUTs have for flow.

My L4060 has about the same flow. My 3rd function is ok most of the time for the smallest SSQA post hold digger you can get. Don't plan on running to much hydraulic motors like a snowblower or tree cutter. It's fine for plow angle or a grapple though. More than a 3rd function on a CUT loader is a bit unusual. Definitely doable, but I'd recommend nailing your use case down well before you install more than just a 3rd function (true 3rd or a diverter).

Kubotabooks.com may have workshop (WSM) & other manuals.

Thanks for verifying that 10 gpm figure, and also how the hydraulic circuit is plumbed.
My only current plans for the motor control valve, would be occasional use of a SSQA post hole auger, and a low flow sweeper. I do understand that I would be limited in uses given the flow. However, the ability to quickly throw on a post hole digger or sweeper, without hooking up a pto power pack, is appealing to me. I've used rear pto powered augers before, and in the right conditions, they work great. They are somewhat of a bear to put on though, expecially if I have to remove the backhoe.

 

[FatTire]

I have a SSQA post hole auger that I run off a 3rd function valve. When doing that I like the BH92 for weight but I disconnect the hydraulics from it. I think the hydraulic auger is both easier and safer to use than the PTO unit. Being able to reverse it is really nice.

 

[cstamm81]

I have a SSQA post hole auger that I run off a 3rd function valve. When doing that I like the BH92 for weight but I disconnect the hydraulics from it. I think the hydraulic auger is both easier and safer to use than the PTO unit. Being able to reverse it is really nice.

Why do you disconnect the hydraulics to your backhoe when running the hydraulic auger? Any issues with the abrupt stopping of the hydraulic motor when using the third function? What model auger are you using, and are you happy with its performance? The last thing I want to do is go to all this trouble and expense, and have an auger that is a toy.

 

[Fallon]

Why do you disconnect the hydraulics to your backhoe when running the hydraulic auger? Any issues with the abrupt stopping of the hydraulic motor when using the third function? What model auger are you using, and are you happy with its performance? The last thing I want to do is go to all this trouble and expense, and have an auger that is a toy.

Not directed at me, but I'll answer the non hoe questions...

Yes, my hydraulic lines jump a lot whenever I let off the 3rd function button. I have 1/2 NPT 3 GPM 15-3 PSI Hydraulic Cushion Valve | Relief & Cushion Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com on the shelf I need to install. Debating on adding it to the 3rd function on the teactor so it affects any impliments or on the PHD itself. It's been on the shelf for a while so when I blow a line it's my own dam fault. Not nearly as bad as the momentum on say a rotary cutter which would absolutely blow up the lines or motor.

I have a Danhuser EP6, which I assume is pretty much the same as their current EP615. EP615 Auger System | Danuser

It's less power than a PTO PHD on my old L3200. 25hp vs under 15hp on tap for the hydraulics on my L4060 (10gpm give or take at 2,500psi). Down pressure, reverse & ease of hitching makes it more pleasant to use. This week it took 30-45 seconds to sink the 12" auger in 3' or more with little fiddling. When our clay gets hard & dry it can take a couple minutes per hole & a bit of fiddling to not stall the auger. More fiddly with open center hydraulics running the auger & loader than the 3pt hitch. But you had to be careful to not corkscrew the PTO auger on the 3pt so that was fiddly as well.

While not perfect it's very much a tool, not a toy.

 

[cstamm81]

Not directed at me, but I'll answer the non hoe questions...

Yes, my hydraulic lines jump a lot whenever I let off the 3rd function button. I have 1/2 NPT 3 GPM 15-3 PSI Hydraulic Cushion Valve | Relief & Cushion Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com on the shelf I need to install. Debating on adding it to the 3rd function on the teactor so it affects any impliments or on the PHD itself. It's been on the shelf for a while so when I blow a line it's my own dam fault. Not nearly as bad as the momentum on say a rotary cutter which would absolutely blow up the lines or motor.

I have a Danhuser EP6, which I assume is pretty much the same as their current EP615. EP615 Auger System | Danuser

It's less power than a PTO PHD on my old L3200. 25hp vs under 15hp on tap for the hydraulics on my L4060 (10gpm give or take at 2,500psi). Down pressure, reverse & ease of hitching makes it more pleasant to use. This week it took 30-45 seconds to sink the 12" auger in 3' or more with little fiddling. When our clay gets hard & dry it can take a couple minutes per hole & a bit of fiddling to not stall the auger. More fiddly with open center hydraulics running the auger & loader than the 3pt hitch. But you had to be careful to not corkscrew the PTO auger on the 3pt so that was fiddly as well.

While not perfect it's very much a tool, not a toy.

Thanks for the detailed reply, very helpful. I was leaning towards installing a separate electric over hydraulic motor control solenoid, which would allow hydraulic motors to coast to a stop. It may be overkill, but I feel it would be the safest way to run hydraulic motors. Besides the cost, my only concern is finding ideal mounting space for a few electric valves, 1 for motors, and 1 or 2 for cylinders (2x third functions).

 

[Fallon]

Thanks for the detailed reply, very helpful. I was leaning towards installing a separate electric over hydraulic motor control solenoid, which would allow hydraulic motors to coast to a stop. It may be overkill, but I feel it would be the safest way to run hydraulic motors. Besides the cost, my only concern is finding ideal mounting space for a few electric valves, 1 for motors, and 1 or 2 for cylinders (2x third functions).

A crossover relief valve is cheap & won't let line pressure spike to high. It's a more universal solution to as it will work just fine with a cylinder or a motor. It's also the simplest solution. The more complex & fancy things get, the more I appreciate simple system that just work with fewer failure points.