Leaky Hoe...

I always block up the main frame of the hoe, or the 'box' around the valve section, for lack of proper term. I block it on each side just under the base of the outrigger. I do this just before the tractor is driven ahead. I also use 2 long posts on an angle, against each side of the top of the boom, to hold it steady. Last time I did this on a 680, I parked it with the boom along side a sea container, and used a chain to brace it from falling over. A tree would have worked as well.

I put another block under the swing tower pivot pin to keep the 'frame' level.

Most, if not all of the cylinder hoses have to be taken off the valve assembly, before the spool caps come off, as I remember. I relieve the pressure on all the cylinders just before disconnecting the big quick coupler. The hoe settles on the blocks and the boom braces will tighten. Phil

oarwhat said:

S1120 I don't know why you want to pull the entire valve body . Thats alot of work...

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Well, that was my suggestion oarwhat, and here's why; not saying he has to, but he's going to have to go through a good bit of work just to repair a single leaking spool seal. And on an older machine, it's very likely if one spool seal is leaking, won't be long until the other old spool seals are going to be leaking, might as well replace all the spool seals while you've got the unit disassembled to access components. And if all the spool seals are old and tired, you can bet those o-rings between the spool sections are going to be hard as a brick, how long is it going to be until one of those fail and it's leaking again? That's my logic, if I'm going through the trouble to access that control valve, I think I'd rip it apart and fix it to be done with it for a while. Just my humble opinion.

I had only one spool leaking in my assembly. I decided to reseal all of them. That is when I found someone before me had installed the wrong type of O rings in three different spools. As ATCO said, sooner or later the others were doomed to leak also.

Phil,
Thanks for the info. I have a place that has a few trees out back, that would be perfect. I also think I have a nice steel support for the boom laying around. Thanks!

As for the valve... Ill have to scope it out once I get the hoe off. See what i want to do. As was said, its over 40 years old.... maybe better to just do the whole thing, and then my kids wont have to worry about it down the road.

Any tips of the trade to keep the hoses in order???

Atco I agree 100% I didn't know he had to pull the hoe to get at the valve. Randy

s1120 said:

As was said, its over 40 years old.... maybe better to just do the whole thing, and then my kids wont have to worry about it down the road.

Any tips of the trade to keep the hoses in order???

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Now you got the idea s1120.

Keep the hoses in order? Center punch and hammer. When you go to take a hose connection loose, punch a single dot on the valve fitting and the nut of the hose fitting that's connected to it. On the next hose connection, punch two dots with the center punch. The next, three dots. Pretty easy to do and don't wash off. Same thing if you decide to take the valve sections apart. Matching punch marks for each valve section.

To identify hoses I use colored Tie Wraps. After using all the colors once I then use two Tie Wraps same color or different colors. They will fit nicely on the steel fittings the hoses are attached to.

Yep, colored tie wraps work real well Tinkerer.

Great idea with the tiewraps, and I have used the punched dot thing on engines I have rebuilt before to keep bearing caps in order. I did not eaven think if it for this. Thanks!

Well a few years later, and I have been living wiht the leak, but its gotten too bad now to put up with it. So Im going in!!!! I belive im going to reseal the whole thing wile im in there...its due.... SO looking for the crowfoot flare nut wrenches now!!!

I just completed doing the reseal/rbld of the backhoe valves. I pulled the whole valve bank so I could work on it on the bench. All I did to ensure the pressure was off was to extend the boom, put the outriggers on the floor and cycle all the spools with the engine off. As i removed each hose, I bagged the end of he hose with a sandwich bag secured with colored tie wraps for coding. Copied the page from the parts manual and drew a diagram of where the colored hoses went. It's not that hard a job.

TheOldMan said:

I just completed doing the reseal/rbld of the backhoe valves. I pulled the whole valve bank so I could work on it on the bench. All I did to ensure the pressure was off was to extend the boom, put the outriggers on the floor and cycle all the spools with the engine off. As i removed each hose, I bagged the end of he hose with a sandwich bag secured with colored tie wraps for coding. Copied the page from the parts manual and drew a diagram of where the colored hoses went. It's not that hard a job.

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Thaks for the tips! I havent been here in a bit, and havent touched the hoe yet. SO thats still on my todo list!!