Backhoe JW03 BackHoe capacity??

[DirtPoor]

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]

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]

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]

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]

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

 

[DirtPoor]

</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]

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]

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]

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]

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.

 

[DirtPoor]

Mine is a subframe mount and the dealer took the nice 'air ride' seat off and installed a much cheaper rotating seat like you discribe. The lower (only) bearing came apart the first time I sat in it with the pin removed. I now see a warning on the net, that this will happen if you don't put the pin back in. I was in one of those situation where I was using the hoe for about a minute, then moving the tractor to the next spot. That pin is a real pain to mess with..

I took the broken rotating seat back to the dealer and exchanged it for the much better OEM seat.

I was going to modify it like shown on John's Tractor site but have since come up with a plan to moun a small fold down seat on the back of the sliding seat.. With the OEM seat slide all the way forward there is enough room for this and I don't compromise the seat belt system.

To answer Johns question, the only time I have oil come out of the vent holes in the plug is when I'm loading/unloading the tractor without ramps and the angle of the climb is kinda steep. Not a big deal and sure beats dealing with ramps. Sure impresses the 'sidewalk supervisors' when I put it in low low 1st/4wd and let it creep up onto the trailer. BTW, my railer has a very low bed since it has a torsion axle.

Steve

 

[JohnS]

Agree with that bearing in that seat. As soon as you put any pressure on it, it pops out of the race. So far, have been happy with the swivel spring seat, I made last spring.

Never thought about putting a seat on, like you mentioned. Post a pic when you do it.

 

[jswisc]

I tended to lose hydro fluid out of my rear tube as well. I've got some pretty steep hills i go up every other day. I just cut the curve off the "J", stuck on 6" of plastic tube and a fuel filter on the end to keep out solids. Works fine and tank stays topped off. /forums/images/graemlins/cool.gif

 

[SevenCorners]

John Central VA is all mountains similar to WVA up and down very steep my property boarders the Skyline Drive and Wintergreen Ski Resort.

 

[JohnS]

I have been through the Blue Ridge Mnts a few times, and yes they are steep! Have some decent hills here too. Was just trying to understand how steep we are talking about.

BTW, it is part of the chinese design to help prevent rust to immediate area! /forums/images/graemlins/laugh.gif

 

[JackyD]

Hello Dirtpoor, have you already made your special seat for the backhoe? Can you post a picture of it, because I am going to make me one too. I am just sitting like a monkey when I am working with my frame mounted JW03backhoe at my Jinma 224!!! /forums/images/graemlins/confused.gif /forums/images/graemlins/tongue.gif /forums/images/graemlins/crazy.gif