akb1212
Aluminum
- Joined
- Jun 26, 2009
- Location
- Norway, Vestfold
All,
Finally I have had some progress on my MahoMH600E. After switching the whole controller with the guy in this thread with a similar machine we now have both machines working. Meaning I'm now able to start the controller and make the axes move. He's able to make his machine work with my controller that I wasn't able to get to work on my mill, and I'm able to get my machine running with his. He is even using his machine to make money now by boring engine blocks for cars.
But now I have serious problems with the hydraulics for the ATC. After a thorough cleaning one of the valves started to leak out through the coil. Therefore I attempted to take it off to see if I could make it work again.
But this ended in disaster, and after putting it back I now have one more problem. The pump now starts every 3rd second, and runs for about .5 seconds. This indicates to me that there is a leak. But this leak isn't possible to see. There is no oil leaking except for the one drop of oil an hour that the first mentioned valve had in the first place.
Could this come from air trapped in the system? I had to empty out all the oil, and I'm sure some air went in the hoses.
I could try to get as much of this air out of the system, but I have removed most of it already by manually pushing the valves to make the cylinder go back and forth some times. And it now feels as if there is no more air in the system. But the pump is still turning on and off in quick succession.
But the main question is how to disassemble the valve? I found the national supplier for HAWE here in Norway, and they could sell me a new one. But it wasn't cheap I can tell you that. About $500 is a bit more than I would like to spend on this. Especially since the leak isn't that big.
Anyway, he expected it to be the o ring between the coil and the valve that made the initial leak. He even gave me the size of o ring to use (28 mm * 1.5 mm). My problem is I'm not familiar with hydraulic valves like these, and I have no idea on how to take it apart. And there is no evident way to take it apart as far as I can see. I would expect the valve and coil to be possible to be parted. There are also two screws that seem to keep the two parts together. But after removing the screws there was still no way the two parts would come apart. Is there a trick here, or a special tool or something I need to take it apart? I did apply some force to try to get it apart, but I gave up when it only felt like I was making things worse.
I have looked for these valves on ebay, but so far I haven't had any luck. Apparently most other machines use other configurations of valves. The valves on my machine are VP1G. Here is the datasheet.
The four o rings sitting between the valve and the main block were clearly old, and should probably be replaced as well. They were deformed by being squashed together for so long, and possibly don't make a good seal anymore. I will try to get the correct ones. The local supplier only had a softer version that I suspect won't withstand the pressure used.
The question now is what to do..... I could probably live with the initial leak, as it's only a drop now and then. The problem then is how to prevent it from starting and stopping like it is doing now.
So any advice on how to proceed would be very welcome right now. Hydraulics is the one discipline I'm leas familiar on when it comes to these machines.
Regards
Anders
Finally I have had some progress on my MahoMH600E. After switching the whole controller with the guy in this thread with a similar machine we now have both machines working. Meaning I'm now able to start the controller and make the axes move. He's able to make his machine work with my controller that I wasn't able to get to work on my mill, and I'm able to get my machine running with his. He is even using his machine to make money now by boring engine blocks for cars.
But now I have serious problems with the hydraulics for the ATC. After a thorough cleaning one of the valves started to leak out through the coil. Therefore I attempted to take it off to see if I could make it work again.
But this ended in disaster, and after putting it back I now have one more problem. The pump now starts every 3rd second, and runs for about .5 seconds. This indicates to me that there is a leak. But this leak isn't possible to see. There is no oil leaking except for the one drop of oil an hour that the first mentioned valve had in the first place.
Could this come from air trapped in the system? I had to empty out all the oil, and I'm sure some air went in the hoses.
I could try to get as much of this air out of the system, but I have removed most of it already by manually pushing the valves to make the cylinder go back and forth some times. And it now feels as if there is no more air in the system. But the pump is still turning on and off in quick succession.
But the main question is how to disassemble the valve? I found the national supplier for HAWE here in Norway, and they could sell me a new one. But it wasn't cheap I can tell you that. About $500 is a bit more than I would like to spend on this. Especially since the leak isn't that big.
Anyway, he expected it to be the o ring between the coil and the valve that made the initial leak. He even gave me the size of o ring to use (28 mm * 1.5 mm). My problem is I'm not familiar with hydraulic valves like these, and I have no idea on how to take it apart. And there is no evident way to take it apart as far as I can see. I would expect the valve and coil to be possible to be parted. There are also two screws that seem to keep the two parts together. But after removing the screws there was still no way the two parts would come apart. Is there a trick here, or a special tool or something I need to take it apart? I did apply some force to try to get it apart, but I gave up when it only felt like I was making things worse.
I have looked for these valves on ebay, but so far I haven't had any luck. Apparently most other machines use other configurations of valves. The valves on my machine are VP1G. Here is the datasheet.
The four o rings sitting between the valve and the main block were clearly old, and should probably be replaced as well. They were deformed by being squashed together for so long, and possibly don't make a good seal anymore. I will try to get the correct ones. The local supplier only had a softer version that I suspect won't withstand the pressure used.
The question now is what to do..... I could probably live with the initial leak, as it's only a drop now and then. The problem then is how to prevent it from starting and stopping like it is doing now.
So any advice on how to proceed would be very welcome right now. Hydraulics is the one discipline I'm leas familiar on when it comes to these machines.
Regards
Anders