L2350dt retrofitting a BL4690b backhoe

[fox2boost]

Hi!
i bought a bl4690b off facebook, the guy got it at auction. The hoe is missing the pto pump. kubota has discontinued this pump.

My questions are?

If i buy an after market pump with the correct gpm/pressure how do i go about mounting it? all the aftermarkets i see are side mounted instead of flush like the oem unit.

If i hook to the tractor hydros how do i about doing this? do i need a bypass valve of some sort? im not opposed to going this route if its easier then the pump option. the hoe will prob never come off and i dont use the pto for anything.

Thanks in advance im very green with the hydro stuff any help is appreciated..

 

[TheOldHokie]

Hi!
i bought a bl4690b off facebook, the guy got it at auction. The hoe is missing the pto pump. kubota has discontinued this pump.

My questions are?

If i buy an after market pump with the correct gpm/pressure how do i go about mounting it? all the aftermarkets i see are side mounted instead of flush like the oem unit.

If i hook to the tractor hydros how do i about doing this? do i need a bypass valve of some sort? im not opposed to going this route if its easier then the pump option. the hoe will prob never come off and i dont use the pto for anything.

Thanks in advance im very green with the hydro stuff any help is appreciated..

Thats a lot to answer. Short answer is using tractor hydraulics is easiest but hoe will be slower. What was the flow on the original PTO pump?

Dan

 

[fox2boost]

5.8 gpm i beleive

 

[Henro]

Make sure you get the proper heavy duty top link bracket, since it is a 3PH backhoe.

Great risk of damaging the transmission case otherwise.

I have the same backhoe on my B2910 and I have used it A LOT over twenty plus years with no issues. A 3PH backhoe is not as worrisome, as far as tractor damage goes, as many people seem to think.

 

[fox2boost]

yes i found that bracket from Kubota it wasn't terribly priced $
115

 

[TheOldHokie]

5.8 gpm i beleive

Your tractor is rated at 4.4 GPM so it will run at 4.4/5.8 = 75% as fast.

Dan

 

[fox2boost]

Your tractor is rated at 4.4 GPM so it will run at 4.4/5.8 = 75% as fast.

Dan

do you think this is a viable option? will just power be affected or just speed?

 

[TheOldHokie]

do you think this is a viable option? will just power be affected or just speed?

Viable if you dont mond the slowdown in speed. Power is a function of pressure so you would calculate it the same way I calculated speed. Do you know what the relief pressure setting is in the backhoe valve?

Dan

 

[North Idaho Wolfman]

A PTO pump is easy and painless.
Just slide the pump on the shaft and connect to the plumbing on the BH and go to work.
It will be fast and efficient.

Adding a Hydraulic loop on a L2350 is not easy or cheap, and that pump is small and slow.
It was designed to run the three point and that was it.

 

[fox2boost]

Viable if you dont mond the slowdown in speed. Power is a function of pressure so you would calculate it the same way I calculated speed. Do you know what the relief pressure setting is in the backhoe valve?

Dan

i do not

 

[fox2boost]

A PTO pump is easy and painless.
Just slide the pump on the shaft and connect to the plumbing on the BH and go to work.
It will be fast and efficient.

yes but i assume it has to be solidly mounted, that doesn't sound very easy..

 

[TheOldHokie]

yes but i assume it has to be solidly mounted, that doesn't sound very easy..

It just needs a torque arm which can be as simple as a chain but its not always easy to slide a standard PTO pump onto the PTO of a compact tractor.

Dan

 

[fox2boost]

i was looking at this style pump if anyone had any pictures of how they made the mounting hardware,

Vevor Hydraulic Pump 16.6 GPM 540 RPM 2500PSI SAE 16 and SAE 12 Port f

Vevor Hydraulic Pump 16.6 GPM 540 RPM 2500PSI SAE 16 and SAE 12 Port for Log Splitters or Tractors New. Authorized Dealer. Brand new in box. 1 year warranty. Free shipping, manufacturer direct.

factorypure.com

pic for reference of oem pump and mounting, very different..

 

[TheOldHokie]

i was looking at this style pump if anyone had any pictures of how they made the mounting hardware,

Vevor Hydraulic Pump 16.6 GPM 540 RPM 2500PSI SAE 16 and SAE 12 Port f

Vevor Hydraulic Pump 16.6 GPM 540 RPM 2500PSI SAE 16 and SAE 12 Port for Log Splitters or Tractors New. Authorized Dealer. Brand new in box. 1 year warranty. Free shipping, manufacturer direct.

factorypure.com

pic for reference of oem pump and mounting, very different..

As long as you can fit it on the PTO its fine. But they are big and Kubota likes to obstruct that area with things like gaurds, drawbars, and sway brackets....

Measure twice, buy once.

Dsn

 

[North Idaho Wolfman]

That pump doesn't "mount" it just has an arm or chain that keeps it from spinning on the shaft.

This pic has the bar and chain attached, yes that's all it needs.

 

[TheOldHokie]

Heres a picture of the PTO on a L2350. Looks pretty cramped in there.

Dan

 

[fox2boost]

yes it does, i would love to see if someone had that aftermarket pump on..

 

[TheOldHokie]

yes it does, i would love to see if someone had that aftermarket pump on..

You need to measure but I think you would need a PTO shaft extension and some means to support the pump.

Dan

 

[Flintknapper]

You need to measure but I think you would need a PTO shaft extension and some means to support the pump.

Dan

Shaft extention would make things easier. The depth of the 'guard' is about 8" and the area under the guard is roughly 10" x 10". However the guard is easily removed (just two bolts). Then there would be plenty of room in every direction for a pump.

 

[TheOldHokie]

Shaft extention would make things easier. The depth of the 'guard' is about 8" and the area under the guard is roughly 10" x 10". However the guard is easily removed (just two bolts). Then there would be plenty of room in every direction for a pump.

View attachment 154142

There you go. Are you sure it will clear the drawbar and top link bracket?

Dan