Liberty Implements Backhoe

[Boyd L]

Can anyone share where I might find some information such as retailers, service providers, owner/service manual, etc... for a Liberty Implements Backhoe attachment?
I just purchased one second hand and from appearances it looks practically unused. However the operation of the hoe, though functional when not under load, is not generating enough force to dig when used in sod. The obvious source (Liberty Implements) doesn't have a currently functioning website (or at least I can't find one), nor is there an answer at the only phone number I can find.
It's a 3-pt hitch unit with a PTO powered pump, sitting on the back of a Kubota L3830. No leaks or obvious damage to the hoe. Specifically I'm wondering about the hydraulic fluid spec and failing that as a reason for weak output, is a pump rebuild an option? There is no name on the pump to indicate manufacturer but I do have pictures if someone can identify the source of the pump through those.

 

[George2615]

I have a Woods BH750 with PTO pump and subframe that I adapted to fit my tractor. I found I need to run the RPM around 22-2400. Any slower and it doesn't seem to have power to dig. I run TSC premium universal hyd fluid in mine.
Can't help on manual for your Liberty. I almost ordered one before finding a deal on my Woods. What RPM are you running at?

 

[Boyd L]

Thanks for the reply George. That's the fluid that's been in my machine.
The last time out I ran it at 2500+ RPM.

 

[Imold]

Will this help? Just for info.
liberty backhoe parts catalog transportini.com

 

[Boyd L]

The link takes me to what appears to be a PDF or photo of a IH backhoe manual's cover page. But I do appreciate the trouble you went to.

I'm thinking a replacement of the pump with something with a better support network. As previously mentioned I don't know much about PTO pumps but I guess there's only one way to change that. Maybe I should have focused my thread on that possiblity.

Thanks again.

 

[5030]

Prince Hydraulics offers a replacement PTO pump. I bet the pump is shot.

 

[Boyd L]

Prince Hydraulics offers a replacement PTO pump. I bet the pump is shot.

Would you (or anyone else for that matter) have suggestions as to the pump specs I should be looking at for a replacement pump?

 

[oldnslo]

Boyd,
I would suggest doing some testing Before condemning or replacing the pump. Pumps are frequently replaced and then determined they were not the problem

Do any functions seem to have full power or do they all seem weak? I.e. will the stabilizer lift and hold like you expect?

A couple of simple tests:

1) shift a valve to bottom a cylinder and hold the valve in that position. Do you hear anything than sounds like fluid flowing under pressure? There is a relief valve is the system somewhere probably in the valve stack. If this is opening the tank line of the valve stack will start to get warm.

2) Does the pump housing get hot when you do this? If yes then the pump could be suspect

I would suggest getting a pressure gauge and required fitting and tee this into the pressure line. With luck the valve stack might have a port for a gauge.

Doing this will allow you to watch the pressure while operating different functions to see if the pressure is similar from function to function

 

[Boyd L]

Boyd,
I would suggest doing some testing Before condemning or replacing the pump. Pumps are frequently replaced and then determined they were not the problem

Do any functions seem to have full power or do they all seem weak? I.e. will the stabilizer lift and hold like you expect?

A couple of simple tests:

1) shift a valve to bottom a cylinder and hold the valve in that position. Do you hear anything than sounds like fluid flowing under pressure? There is a relief valve is the system somewhere probably in the valve stack. If this is opening the tank line of the valve stack will start to get warm.

2) Does the pump housing get hot when you do this? If yes then the pump could be suspect

I would suggest getting a pressure gauge and required fitting and tee this into the pressure line. With luck the valve stack might have a port for a gauge.

Doing this will allow you to watch the pressure while operating different functions to see if the pressure is similar from function to function

Thank you.
Both tests for temperature are quick and simple. One question, when you say the tank line of the valve stack or the pump will get "warm", how warm? Too hot to touch? I ask because there's always something hot on everything I use. Any suggestions are welcomed for gauging this.
Another question: should the pressure gauge used be capable of 2500 or more psi?

Thanks again.

 

[oldnslo]

Boyd
Temperature rise depends on amount of flow, pressure & time at pressure. What you are looking for is a noticeable difference of temperature between the pressure line going to the valve and the tank line. If the relief is opening or there is a leak in the valve stack the tank line temperature will rise vs pressure line.

Same thing with the pump, if it is slipping or bypassing internally the pump housing will get warmer than the inlet hose relatively quick.

Gauge size? I suspect this would operate at 2500 PSI or less but would recommend 3000 PSI for a little safety margin. If you have a 2500 use it. Just feather the controls to what the pressure does.

Hopefully my responses answer your questions