eBay/Craigslist Back hoe question

[jakell2010]

Hi

I am new to the Chinese board,,,been around here a while though (TBN),,,anyway, I have a 2011 Kubota 2920B series,,,here goes,, surfing craigslist the other day I see " Backhoe 7' used 10 hrs, stored inside $2000", so I go to see it, and this chap had one time tried to start a dealership of Asian tractors and had bought several units to sell, he says when he got it he found that it didn't have a few things like stops for the swing etc. ( he's an engineer),, so it has been slightly modified.,,,but it looks fine, actually like new. What concerns me are the o- ring flat seals,,,it uses this on all fittings, the hoses look like new, but as everyone knows,,,,hoses are meant to be cut.

My needs for the hoe are slight,,,,,mainly around the farm kind of stuff,,,tree stumps,,test hole fence posts, etc.,,,probably won't see much use. This hoe runs off tractor hydraulics. He was running on a 1310 ford, pushing like 5 GPM, it was slow, but worked, . I am having my tractor plumbed for rear hydraulics tomorrow to see how it'll work on my tractor. It's a 3 point type

What do you think, should I not buy this thing,,,for my use a $2,000 hoe is perfect, far less than $8,000

The other thing was ,,the seller said the valve body has no bypass' in it, it has to be run by PB from the loader


Joe

 

[J_J]

Do you have FEL valve with PB?

Are you planning on plugging in to the remote valves for BH?

Detent on the remotes would be a good thing.

Do the remotes have PB?

How many GPM's does your tractor have?

What do you mean by no bypass on the BH valve? Do you mean no PB on the BH valve?

 

[RonMar]

Does the BH have a fluid tank? Does it have it's own pump? It can be run from a PB port on the tractor as long as it has a low pressure return to the reservoir. BH's tend to work the fluid hard and make a bit of heat. Most run their own pump and tank to help deal with this heat.

As for the hoses, every chinese BH I have seen uses the ORFS hoses. Any dealer that imports the chinese hoes should be able to get you replacement hoses if you need them...

 

[Bob Rooks]

ORFS fittings are becoming very common for low volume systems on today's construction equipment, however, the Chinese chose a metric size that's not available through regular sources (18 mm x 1.5).

The seller states the valve stack doesn't have a "bypass"? Of course it does. It has a system relief valve! (this fellow is an engineer?) If you remove the console cover you'll see it on the left side - it's the one with the adjusting screw. This hoe is designed for 7 gpm @ ~2,250 psig. All of the hoses are ~1/2" ID or the metric equivalent, which IMHO is too large for this unit.

Problems/issues you can expect: Piston cup seals in the hydraulic cylinders don't like American formulated hydraulic oil - they will decompose and blow, and fill your system with small bits, and plug the relief valve so you will have little, if any, operating pressure. Been there, done that with my Chinese hoe and so have a lot of other folks. The valves are not easily feathered and it will take some getting used to.

After numerous breakdowns, I finally fixed my Chinese backhoe - I replaced it with a LiTW Korean hoe and couldn't be happier. But that's just my story, several others have reportedly had good luck with them

 

[jakell2010]

Yes my loader has PB

I am having pressure and return ports put on the back of my tractor from the F.E.L VB

Why would I need an additional remote with detent before the hoe?,, the hoe has it's own valve body which will be supplied with power from my loader VB power beyond port

The seller said that the hoe doesn't have a relief valve inside the VB?,,that I need to run it off my loader valve PB port, which I do have, and which does have a relief

I have 8.3 GPM, the hoe doesn't have a pump or tank , it's set up for tractor hydraulics

 

[RonMar]

Maybe what he meant was the BH valve dosn't have a PB passage. I would be really surprised if it didn't have a safety relief in the valve block. As Bob mentioned, it will be near where the input hose connects to the valve block. On mine it is on the bottom of the valve block just below where the input hose attaches... Some PB ports have detent valves on them so you can turn the flow to them on and off

Is your tractor hydrostatic drive? If it is and you decide on this I would reccomend a return line filter on the return line from BH to tractor, again provided that return is low pressure to the tractor reservoir. I have had domestic fluid in mine for about 3 years now and have not experienced any seal degredation, but a fine filter would help contain any issues from contaminating your tractors system if you should experience any issues...

 

[J_J]

Yes my loader has PB

I am having pressure and return ports put on the back of my tractor from the F.E.L VB

Why would I need an additional remote with detent before the hoe?,, the hoe has it's own valve body which will be supplied with power from my loader VB power beyond port

The seller said that the hoe doesn't have a relief valve inside the VB?,,that I need to run it off my loader valve PB port, which I do have, and which does have a relief

I have 8.3 GPM, the hoe doesn't have a pump or tank , it's set up for tractor hydraulics

Are you going to keep the BH on all the time? If not, you have to connect a short hose from the pressure fitting to the return fitting to keep the flow in series.

You can always plug in a set of remote valves for other applications, like T-N-T, and other hyd driven attachments, etc.

 

[Soundguy]

sounds like a good price for a small hoe.

I picked up a woods 6500 for 2600$ a while back.

I too only need it for 1/year kinda jobs.. but it sure beats a shovel when ya need it.

I 3-pt'ed mine on an old ford 850 and run off a pto pump.

way cheaper than buying a new hoe, and way more convienient than going and renting one for spure of the moment jobs..

soundguy

 

[NuJinma]

There are problems with the chinese hoe. I have one, it has been working for me for 3 years now. If you blow a hose by tightning down the relief valve to much it is a pain getting new hoses with those fittings. The valving is not too smooth but you will get by and has it does have excellent power.

 

[jakell2010]

JJ,,,,,the Kubota guys didn't mention having to keep the PB flowing by looping it, the valve body on my B2920 is integral on the trans housing , the tractor comes with the loader valve stock,

I thought about putting a filter on the return, what micron size is best?

I see a lot of tractors with coupling that aren't tied together when not in use, what's the difference