need lift / tilt valve for 751

[mmsllc]

I think some parts were lost / destroyed from when we took our valve apart. Now the valve does not leak hydraulic fluid, but the bucket won't tilt at all, or lower when machine is running. I have to turn machine off & pull emergency relief valve by seat to lower it. SUCKS!! Please let me know what you have, Thanks!!

 

[Tazza]

Silly question, BUT could the spools have been put in the wrong holes for lift and tilt?
I'd like to think it's pretty fool proof for the other parts, nothing that could be lost should stop it lowering if nothing is bound up. Does it slide in and out as far as the tilt spools? They should have the same stop length on both segments (if that makes sense). If there is something limiting travel, it would explain why it will not lower.

 

[mmsllc]

Silly question, BUT could the spools have been put in the wrong holes for lift and tilt?
I'd like to think it's pretty fool proof for the other parts, nothing that could be lost should stop it lowering if nothing is bound up. Does it slide in and out as far as the tilt spools? They should have the same stop length on both segments (if that makes sense). If there is something limiting travel, it would explain why it will not lower.

Well, the full skinny on this valve is that it was removed completely from the machine before I ever knew we could remove a few more panels from the machine & remove just the spools themselves. So, in removing the valve, it was thought best to in bolt the two (2) valve halves from each other to make the valve removal even possible with so many metal / steel hydraulic tubes that were in the way. During the removal four (4) or five (5) rubber O-rings fell out from between the two (2) halves of this valve. Then once we had the valve on the work bench, I removed the spools myself, replaced the spool seals & re-installed them back into their respective bores. After that, I handed the job off to the guy who removed the valve. After he was done, it did not leak hydraulic fluid anymore, but it also no longer worked as it should; meaning lifting, lowering & tilting. It was a bummer because of the overall amount of work involved with resealing the spools, ya know?? To make matters worse, my guy showed me a small piece of metal (that we could not identify) that he though for certain came out of the valve, somehow. So, I guess I either need another valve that hopefully has not been taken apart at all & is known to have worked good, or remove this entire valve again & compare what we did procedure wise to a repair manual for that valve. This particular machine is an old concrete machine & really looks like hell, but it used to run so perfect before this hydraulic leak appeared out of nowhere.

 

[mmsllc]

Well, the full skinny on this valve is that it was removed completely from the machine before I ever knew we could remove a few more panels from the machine & remove just the spools themselves. So, in removing the valve, it was thought best to in bolt the two (2) valve halves from each other to make the valve removal even possible with so many metal / steel hydraulic tubes that were in the way. During the removal four (4) or five (5) rubber O-rings fell out from between the two (2) halves of this valve. Then once we had the valve on the work bench, I removed the spools myself, replaced the spool seals & re-installed them back into their respective bores. After that, I handed the job off to the guy who removed the valve. After he was done, it did not leak hydraulic fluid anymore, but it also no longer worked as it should; meaning lifting, lowering & tilting. It was a bummer because of the overall amount of work involved with resealing the spools, ya know?? To make matters worse, my guy showed me a small piece of metal (that we could not identify) that he though for certain came out of the valve, somehow. So, I guess I either need another valve that hopefully has not been taken apart at all & is known to have worked good, or remove this entire valve again & compare what we did procedure wise to a repair manual for that valve. This particular machine is an old concrete machine & really looks like hell, but it used to run so perfect before this hydraulic leak appeared out of nowhere.

I think after we get the 863 to start & run correctly, we will visit the BOBCAT dealership and get a parts break down on this valve. I am really wanting to get this machine repaired asap, as I know it will sell once running good again. Any thoughts on a valve breakdown / diagram??

 

[Tazza]

I think after we get the 863 to start & run correctly, we will visit the BOBCAT dealership and get a parts break down on this valve. I am really wanting to get this machine repaired asap, as I know it will sell once running good again. Any thoughts on a valve breakdown / diagram??

I may have a diagram, i'll look for it for ya.
The part that was found, can you email me a picture? If it's what i think it could be, it sort of looks like a bar stool with a hole in it? This is the only part that sort of floats in the control block that i can think of.