Backhoe first time owner, first time operator...i broke it.

[whsnyderiii]

Sweet....starting to learn the shuttle shift. Getting 4th going sucks. Anyway, I have a backhoe attachment. Was going to remove it so I can play with a Bush hog this weekend. There's a pin in the arm that I couldn't get out. It was binding. The PO told me to touch back on the left hand control arm to take the pressure off and the pin would come out. Tried that..didn't release. Touched back some more still didn't release....again...pop! Hydraulic fluid pouring out. Pulled the cover thinking I would discover a blown hose/fitting. However, what I discovered is there isis a small set screw looking hole to the far right of the controls, at the top, where hydraulic fluid flows out of when I engage either the a or the b remotes. WTF did I do? Is that whole far right block screwed? Is this just a find the right set acre cause u blew some kinda relief valve...need some help/advice here. Im mechanical, but don't know didly about hydraulics. I'm going to try and attach two pics. One of the whole system of hydraulics and one close up of the far right set screw spot where the hydraulic fluid came out of. Thanks a million.

 

[whsnyderiii]

After all that explanation...it appears this is done kind off pressure relief spot. Maybe this is ridiculously simple. Just get a set screw for that spot and I'm good to go. However, the reason I didn't just do that is that in the middle of the bank of hydraulics (pic 1) there is another one of these set screw spots which is not leaving and also does not have a set screw in it. That's what caused me to ask for help, thinking it wasn't something as easy as it first looked.

 

[mfreund]

What kind of tractor and backhoe?

 

[whsnyderiii]

It's a kioti dk45c. It's a dk2385 back hoe. Looking at MIE it appears to be a port relief valve. It's like 240 bucks from them. If that's what it is...fine. However, I'm unable to do anything with my pto until I get this fixed. Weekend gone. Can I put a set screw in the top just in order to operate the back hoe only to get it off the tractor?

 

[ritcheyvs]

I'll bet JJ knows.

 

[VictorW]

I have a KB2375 and my valve block set up is by Nimco. Yours looks similar but Kioti used several brands of valves. MEI site shows a Hanil brand valve block for your KB2385 but those diagrams don't match your pictures. Yours looks like my Nimco. Like this Error. About 8 years ago, I had to change a bad valve block for one of my stab legs, center two. Each one of the valve blocks, castings, are the "same" and they're just sandwiched together to make the entire valve system. If you notice the main two levers, their mounting uses this threaded hole in the respective blocks to mount each of the two levers. Looking at your picture, each of the main lever mountings has an allen head screw on the left front side. This screw should go into a blind drilled threaded hole. Apparently this valve had the hole drilled a little to far and it finally let go. I'd just find a set screw, it will be metric (M5-0.8P), and loctite it in the hole.

 

[murphy1244]

I'll bet JJ knows.

Yea you might want to put this in the hydraulics forum.

 

[countrybumpkin]

If you notice the main two levers, their mounting uses this threaded hole in the respective blocks to mount each of the two levers. Looking at your picture, each of the main lever mountings has an allen head screw on the left front side. This screw should go into a blind drilled threaded hole. Apparently this valve had the hole drilled a little to far and it finally let go. I'd just find a set screw, it will be metric (M5-0.8P), and loctite it in the hole.

I am thinking the same thing, if your talking about fluid coming out of the small threaded hole.

 

[o2batsea]

OK I'm a doofus, cz I can't figure out why you can't take the BH off even with the hydraulic leaks. From what you are saying it only spews when you hold open the valve with the cylinder at full out/in, or when trying to move against the pinned arm (yeah dont do that if you can avoid it).
The secret to removing the BH is to lower the outriggers till they just take all the weight. You pull tractor forward 6" to drop the subframe out. Put a couple cinder blocks under the BH. Raise the outriggers to drop BH on the blocks. Undo hydro lines.

 

[murphy1244]

OK I'm a doofus, cz I can't figure out why you can't take the BH off even with the hydraulic leaks. From what you are saying it only spews when you hold open the valve with the cylinder at full out/in, or when trying to move against the pinned arm (yeah dont do that if you can avoid it).
The secret to removing the BH is to lower the outriggers till they just take all the weight. You pull tractor forward 6" to drop the subframe out. Put a couple cinder blocks under the BH. Raise the outriggers to drop BH on the blocks. Undo hydro lines.

How do you take the pressure off the lines?

 

[radioman]

To take pressure off the lines on my kubota backhoe I just simply turn off my engine. Reason is that it has a power beyond hose that is constantly flowing while running. The kioti may be the same way.

 

[paulfun9]

Outriggers just on the ground enough to take the weight. bucket on ground for balance. Remove locking pins for sub frame If pins are tight /hard to pull out you can simply push the reverse pedal a little or use the bucket curl to remove pressure on pins. Once pins are out simply drive forward slowly just enough to release subframe.. Adjust backhoe to what ever position you want it and then turn remote lever to middle position For safety reasons I always shut the machine off but with the switch to the middle/off position you can remove the HYD lines and then drive the tractor away from the backhoe.

 

[Xfaxman]

Just to be sure, is this the hole?

 

[o2batsea]

How do you take the pressure off the lines?

I let the outriggers down.

 

[Amvcane]

To take the pressure off the lines: with the backhoe remote in neutral or better yet engine off, cycle both joysticks till the unit settles, pressure is relieved. Disconnect the lines. If you don't do this you will never be able to reconnect the lines with out relieving the pressure. You are not strong enough. If you have the backhoe disconnected with pressure in the lines as I once did. You will have to relieve the pressure by loosening the fitting at the QD or depressing the tip of the QD on a hard flat surface. Both should be done with a rag around them or you will get wet. This I knew and did not get wet.
I am not sure how your DK's are laid out but on my CK the hydro filter is located right above the backhoe frame rail. Before driving away from the hoe I make sure that it is balanced so the front of the hoe frame will not lift and crush the filter when driving off. To help with this the top of the front receiver is about 3" longer than the bottom. This lets the hoe frame disconnect from the tractor and not lift. Now I can lower the frame away from the tractor. My dealer warned me of this and I have not crushed a filter yet.

 

[whsnyderiii]

Sorry, all... I unfortunately had started another thread in the Hydraulics section and forgot about this one. I got the back hoe off. Turns out that hole (yes the one you have indicated xfaxman) was NOT the leak. My "eyes" let me down but she usually is good at that, so I aint mad. The actual leak was from the spool. I disassembled the control valve section and removed the block in question. I got the spool out and discovered my only problem was a failed o-ring. It was dark and cold, so I haven't put it back together yet, but I will keep everyone updated. I appreciate all the help/advice. Bummer I broke it the first day, but at a repair cost of like 50 cents (for two O-rings) I think I will count my blessings.

 

[DK35vince]

I appreciate all the help/advice. Bummer I broke it the first day, but at a repair cost of like 50 cents (for two O-rings) I think I will count my blessings.

You didn't break it.
It must have been ready to blow.
The backhoe relief valves should go into relief before anything blows.