Backhoe JW03 BackHoe capacity??

DirtPoor · Oct 18, 2004

I have a JW03 backhoe on my Jinma 204. It is driven off the regular hydraulic system, not the rear mounted pump.

I didn't get any literature on it and when I look at the specifications online, they seem to be for the model with a seperate rear mount pump system.

I'm curious about the lifting capacity of this unit in situations where I must move something off the ground. Like a rock or log, once I install a thumb.

I assume this will be effected by the distance I have to reach, away from the backhoe base, etc.

I have similar questions about the FEL but I think that information is available from other sources. I know that I can raise the rear wheels off the ground if I try to lift something too heavy.

Thanks,

Steve

JohnS · Oct 18, 2004

Steve,

I didn't know they were selling the hoe without the tank and the pump. How do they recommend plumbing it? Is it in series with the fel? Post a pic, if you get a chance. Without other input, I'd assume similar specs as the pump/tank model.

DirtPoor · Oct 19, 2004

The hoe isn't installed on the tractor right now but I will post a picture the next time it is. However you are correct that the hydraulics are connected in series with the FEL.

When I install the hoe, I must disconnect a QD in the supply hose to the FEL and connect in the supply and return to the backhoe.

BTW. While shopping for a tractor, I did a test operation of the same model back hoe at another dealer. This model had the standard tank and rear mounted hydraulic pump. The unit was way to "quick on the control sticks". Very jerking operation (and I have operated my JD 1010 track hoe for years).

I then found this adaptation of the same model at Coldwater Tractor in westerm WA. and the controls were much better. However there may be some difference in the actual performance using the hydraulics from the normal tractor system (I didn't operate the standard JW03 long enough to compare this).

Steve

JohnS · Oct 19, 2004

Steve,

The internal pump design of the backhoe hyd pump and the tractor hyd pump are very similar. I don't know how they compare on volume and pressure, but they are probably close.

As you probably already know, be very careful about swapping the hoe in and out. Always have the engine off and double check those QDs before starting. If they are not connected, will dead head the pump. This is probably easier than installing/uninstalling the pump, but need to be very careful with QDs.

The tractor hyd capacity is half of the stand alone, so be careful when using the hoe for extended times. It has less time for oil to cool, before being pumped back through the system. Take this into consideration, when adding additional hydraulics, like a thumb. With all cyl retracted, sets your high tank level, having all cyl extended sets your low tank level. In common use, it might not be probable that you have all extended, but need to evaluate, before level drops where you are sucking air. Just seems like allot of cylinders to run off a 2 1/2 gal tank.

As far as jerky operation, most of that is in the valve assembly, and problems associated with it. It can be some what regulated by engine rpm, but once you have the main boom cyl where they are not jerky, the bucket may be too slow. Otherwise, I don't know why one would have seemed smoother than the other.

Lifting logs, with the hoe, maybe more of a front ballast issue. Hoe is considerable weight on its own. Going up hills, with mine is always interesting. Also need to keep in mind the brakes are probably near their limits with all that weight. Just be very careful as you attempt the first few lifts.

SevenCorners · Oct 19, 2004

Steve, so when you muse the BH you can't use the FEL?

DirtPoor · Oct 19, 2004

</font><font color="blueclass=small">( >so when you muse the BH you can't use the FEL?< )</font>

No,this is not a problem since the lines are connected in series with the FEL and the fluid return from the back hoe circuit provided pressure to the FEL control valve.

Or something like that. I just hook it up like the dealer showed me. He also warned me about reconnecting the fittings when the back hoe was not installed to prevent 'dead heading' the circuit.

BTW. The control jerkyness of both FEL and backhoe has deminished with the change to AW32 hydrualic oil. Plus I don't have to wait for it to warm up.

Steve

SevenCorners · Oct 19, 2004

Steve, my jerkiness has diminished too after the change, I still have to continually "top" mine due to the going up and down hill, fluid spills out of the short breather tube. Someone recommended that I braze an extension onto the tube to keep more fluid in. I will get around to that oneday....

DirtPoor · Oct 19, 2004

My 204 has a modified hex plug without a breather tube so the seat slide will clear it.

The taller tube would prevent fluid leakage when I drive on and off the trailer, but I can't figure how to accomplish this.

I'm think of drilling and taping one of the side vent holes for a hose barb and then run a plastic or oil grade hose up the ROPE. Just have to remove it when I want to check the oil.

Steve

JohnS · Oct 19, 2004

Steve,

Does the factory now have a sliding seat that rotates for the hoe? or does your hoe have its own seat? If it is a 3pt mount hoe, I've seen those, they do have their own seat. Haven't seen that in the frame mounted hoe.

How much hyd fluid are you loosing and at what type of angles are we talking? If not over filled, it would seem that it would take a pretty good angle to get it to flow out the breather, especially the J tube type. I now have the low profile one, but either don't have that happen enough or the oil amount is so little, I don't notice it. After the first year, it gets cleaned like a "real" tractor. Once, maybe twice a year, only if it really needs it. /forums/images/graemlins/grin.gif Oil foaming and dropping the fel after shutdown can cause oil to come out the breather.

bluechip · Oct 19, 2004

Hi John,
I ordered a couple of 6' subrame. asked for JW-3 but what I got has Guilin label, cant remember the model.

Anyway I got swivels to mount the standard seat, slides and all, onto it replaces the riser brackets. To rotate, you pull a pin, rotate the seat, then slide forward or backward into position.

The subframe mount does keep the hoe much closer to the rear of the tractor.