Bobcat 853H some hydraulics are not working. Lift arms go up only bucket is stuck hanging, moves very little.

[bruceondiamondrock]

No leaks that i can find. SN 512815433
Need help where to start. I have the service manual. Looks like my unit does not have a bucket positioning valve. I am printing out a large size system diagram snd trying to logically narrow down the problem area. I think the main control valve is a Jem . Any help would be greatly appreciated.

 

[brdgbldr]

No leaks that i can find. SN 512815433
Need help where to start. I have the service manual. Looks like my unit does not have a bucket positioning valve. I am printing out a large size system diagram snd trying to logically narrow down the problem area. I think the main control valve is a Jem . Any help would be greatly appreciated.

Can you hear the hydraulics try to work when tilting the bucket?

If you can then there is a good chance that the piston seal inside of the tilt cylinder is bad.

If you can’t hear the hydraulics then you may have a bad solenoid on the control vavlve.

Here is a link to the parts catalog:
https://partscatalog.bobcat.com/

 

[bruceondiamondrock]

I can feel more than hear it trying a little bit. The bucket does move but only an inch or so. It’s currently hanging from the raised arms like a limp rag. About the cylinder seal, the lift arm and the bucket both have similar issues. There is no fluid leaking from any cylinders.

 

[brdgbldr]

I can feel more than hear it trying a little bit. The bucket does move but only an inch or so. It’s currently hanging from the raised arms like a limp rag. About the cylinder seal, the lift arm and the bucket both have similar issues. There is no fluid leaking from any cylinders.

If it is a cylinder piston seal there will be no external leakage. The fluid will just pass by the piston inside the cylinder. Thus no, or little, pressure to raise the bucket.

 

[spitzair]

It sounds almost like your auxiliary hydraulics might be stuck on. When this happens the lift arms will go up but won't come down and the bucket will dump but not curl back up. Easy way to test it is to make a hose that loops the auxilliary couplers back to each other. Take a short piece of hydraulic hose say 3 feet long. Put a male coupler on one end and a female on the other, then plug them into your auxiliary hydraulic couplers on your machine. If it works normally with this hose installed then your auxilliaries are stuck on and we can start troubleshooting from there, but most likely a stuck solenoid valve.

 

[bruceondiamondrock]

Thank you