hydraulics on b-hoe attachmnt shut down

[canucklehead]

These are some pics of our backhoe attachment. The PTO powers the pump. There aren't many hours on this unit. My son was extending the hoe and heard a "clicking" sound. He says medium loud. It lasted about 30 seconds and then we couldn't use any of the hydraulic functions for the hoe.

I am a decent backyard mechanic but lost on hydraulics. i checked the resevor and added fluid. Hard to tell if it's that low since most cylinders are exteneded out. I hear no noise at all when he moves any/all of the levers back and forth. No obvious leaks or blow outs anywhere.

So now the tractor sits out in the rain and we can't move a thing. Any suggestions on where to start, or how I can get these cylinders retracted so we can move this into the shop to work on?

where and how do I begin to trouble shoot?

thanks

 

[kennyd]

Start at the pump...Is it turning? Is there a shear pin between it and the PTO coupler? Is the PTO on the tractor working?

Edit:

You can retract the cylinders by operating the appropriate control and lifting the arms or outriggers with a hoist, the releasing the control.

 

[canucklehead]

oops, should have mentioned,the PTO turns fine and seems to be no issue there. I hear no noise for the pump at all, but the tractor is loud.

excellent info on the hydraulic jack to lift the various cylinders. I'll try that.

a 5T floor jack should work fine for that??

will the cylinders remain in after that, or will I need to somehow strap them down so they don't fall back?

does the PTO need to be running, or can we do this as long as we pull the right way on the appropriate lever?

THANKS!

 

[kennyd]

a 5T floor jack should work fine for that??

A 5t jack will work fine-but I was thinking a chain/cable hoist to the ROPS or something else.

will the cylinders remain in after that, or will I need to somehow strap them down so they don't fall back?

The cylinders should hold it up after the valve is closed (neutralized) provided you havent lost any fluid-but strapping is a good safety measure anyway.

does the PTO need to be running, or can we do this as long as we pull the right way on the appropriate lever?

No, it does not need to be running. The fluid will be forced back into the tank just as if it was powered.

Since nothing is working-I still suspect the pump, it's the only real common thing that will keep everything from working. I think the noise he heard was the insides coming apart. Might want to check the tank or filter for metal bits.

 

[canucklehead]

there is no ROPS, here are a couple of pics in better times. maybe I could use the boom with a chain hoist, OR...the winch from my Rhino??

 

[kennyd]

Raise the loader, attach chain from bucket to boom, activate boom lever, lower loader...boom raises.:laughing: Of course the chain will be right at your head!

Use whatever, just plan carefully and think twice-stay safe!

 

[wdchyd]

I agree Kennyd, start at the pump.....the clicking sound could be a bad pto shaft, keyway or hyd pump shaft (snapped internally)

Hard to tell from the pics but is it a Vickers V20 vane pump..??

 

[bindian]

These are some pics of our backhoe attachment. The PTO powers the pump. There aren't many hours on this unit. My son was extending the hoe and heard a "clicking" sound. He says medium loud. It lasted about 30 seconds and then we couldn't use any of the hydraulic functions for the hoe.

I am a decent backyard mechanic but lost on hydraulics. i checked the resevor and added fluid. Hard to tell if it's that low since most cylinders are exteneded out. I hear no noise at all when he moves any/all of the levers back and forth. No obvious leaks or blow outs anywhere.

So now the tractor sits out in the rain and we can't move a thing. Any suggestions on where to start, or how I can get these cylinders retracted so we can move this into the shop to work on?

where and how do I begin to trouble shoot?

thanks

Sounds to me the 30 second sound your son heard was the hydraulic pump eating itself up. You can raise the boom with a hi lift bumper jack then get a come-a-long strapped to either the raised loader or the mid mount for the loader. You will need two people to raise the boom the way KennyD states. One to operate the loader and one to hold the boom lever. Or you can make a stick with a loop of leather on one end to operate backhoe controls from your tractor's seat. Or operate the throttle from you backhoe's seat.
hugs, Brandi

 

[wdchyd]

If it doesn't have a suction strainer it could have swallowed something to jam up the pump and snap the shaft......(wild guess here).....:confused2:

 

[canucklehead]

your replies are all much appreciated. :thumbsup:

I can see the tractor's PTO spin the end where the pump's shaft connects to it. So by PTO shaft, are you referring to the inside of the pump that I can't see? Otherwise, I see te PTO turning freely.

Unfortunately I am inclined to agree that there is something wrong with the pump and that you are most likely right.....that my son was listening to it disintegrate. He usually wears ear protection so what sounded like a "click" over the roar of the engine might have been the sound of it grenading apart.

I'll have to do more research on the pump make/model. Any easy way to look and tell? My neighbour built this backhoe attachment. He's retired and he owned a company that worked on converting heavy equipment into logging equipment. He is a very smart guy and knows his stuff. Unfortunately he's very busy with a big project of his own right now. I really want to get this into a shop so i can take a better look.

So how much will my wallet wail & squeal for a new pump?

 

[canucklehead]

I just checked...the pump is distributed by a local company and has their name marked on it, PSI Fluid Power Ltd. The model number is C2300-V007653

When I go to their webpage, they carry Eaton pumps. This is blue and looks to be shaped a bit like an Eaton/Vickers pump. But when i started poking around at pump prices....OMG!!!!!!!!!!!:shocked::mur: this is worth as much as the attachment.

just curious, we were only moving sticks around, as you can see from the pile...nothing too heavy. Fluid was up before this happened. Is there something I did or didn't do, that caused this to happen? Or is it just bad luck?

thanks

 

[J_J]

https://www.surpluscenter.com/item.asp?item=9-1047-7&catname=hydraulic

 

[canucklehead]

I see on that link that they sell pumps, but how do I figure out what I replace mine with?

 

[kennyd]

I just checked...the pump is distributed by a local company and has their name marked on it, PSI Fluid Power Ltd. The model number is C2300-V007653

When I go to their webpage, they carry Eaton pumps. This is blue and looks to be shaped a bit like an Eaton/Vickers pump. But when i started poking around at pump prices....OMG!!!!!!!!!!!:shocked::mur: this is worth as much as the attachment.

just curious, we were only moving sticks around, as you can see from the pile...nothing too heavy. Fluid was up before this happened. Is there something I did or didn't do, that caused this to happen? Or is it just bad luck?

thanks

Yes, PTO pumps are anything but cheap...I suspect it just happened and that there is nothing you or your son did to cause it. Get the pump off and take it to a local shop-best case is they can fix it.

 

[wdchyd]

Can you take pics of the pump....if it's a Vickers, it may be salvageable....sometimes they'll jamb from a chunk of foreign debris wedged in between the rotor and the cam ring and snap the shaft internally....

wouldn't hurt to open it up anyway to check it out before purchasing a new one..

 

[canucklehead]

sounds like a plan. I'll remove it and take a few pics.

do I have to drain all the hydraulic oil from the resevoir tank ?

 

[wdchyd]

while you are taking it off, notice if it has a splined shaft and look carefully if the splines are worn/stripped.....

 

[kennyd]

sounds like a plan. I'll remove it and take a few pics.

do I have to drain all the hydraulic oil from the resevoir tank ?

Yes, since the one hose connects to the tank fluid will run out when disconnected. I would filter it also through an old shirt to check for metal also.

 

[canucklehead]

while you are taking it off, notice if it has a splined shaft and look carefully if the splines are worn/stripped.....

BINGO!! That's what my neighbour said aswell (he built this attachment). It was connected with a U-joint, one side to the PTO, and one side to the pump shaft. the pump shaft is much harder and stripped out the inside of the u-joint splines. Way better than needing a pump!!:thumbsup:

so now I need to find a yoke with 13 splines. Any suggestions on where I find a U-joint yoke to match?

 

[J_J]

A shop that services driveline products, such as drive shafts, u-joints, etc.