NO HYDRAULICS

[bobjtina]

I recently drained all the hydraulic oil from my newly acquired 722 BobCat. Upon filling it back up I have no hydraulic movement. How do you bleed the system? I have tried to remove some lines and placed oil in them, still no success - HELP.

 

[Tazza]

The system will self bleed.
How did you remove your oil in the first place?
This machine is hydrostatic drive? does it still drive? do your rams operate? Are there any signs of life?
Did you replace it with the correct fluid? even if you didn't, it should still operate.

 

[bobjtina]

The system will self bleed.
How did you remove your oil in the first place?
This machine is hydrostatic drive? does it still drive? do your rams operate? Are there any signs of life?
Did you replace it with the correct fluid? even if you didn't, it should still operate.

Yes the machine is hydrostatic drive. I replaced all four wheel seals and barrings thus drained the oil and replaced the two filters. I refilled it with BobCat fluid. The person I acquired the machine from said that all the hydraulics worked fine. As I know him, I trust this is true. Now the rams do not operate or anything else. It appears that the vane pump is not picking up the oil. I charged this pump by cracking the top fitting and the side fitting. I than put oil in the top till it ran out the side, put everything back together started the engine and still nothing. Any thoughts?

 

[Tazza]

Yes the machine is hydrostatic drive. I replaced all four wheel seals and barrings thus drained the oil and replaced the two filters. I refilled it with BobCat fluid. The person I acquired the machine from said that all the hydraulics worked fine. As I know him, I trust this is true. Now the rams do not operate or anything else. It appears that the vane pump is not picking up the oil. I charged this pump by cracking the top fitting and the side fitting. I than put oil in the top till it ran out the side, put everything back together started the engine and still nothing. Any thoughts?

Even a dry vane pump would pick up fluid....
Can you try disconnecting the pressure line from the pump and start it up? see if there is a problem with it not being able to move the air further down the track enough to charge its self.
The only other thing to do is call your local dealer, there may be a procedure to do this which i don't know about. As soon as you get oil moving, the system will purge its self over time.