1983 bobcat 843B no lift, air locked??

Andrea · Feb 13, 2015

We have tilt with the bucket but no lift. The arms are up and didn't come down at all over night. Is it air locked? If so, is there a bleeder valve? Any other ideas what's wrong??

antfarmer2 · Feb 13, 2015

First becareful block it up chain it or put locks on the ram ........is the aux hydro stuck on?..........did you just service it?

antfarmer2 · Feb 13, 2015

antfarmer2 said:
First becareful block it up chain it or put locks on the ram ........is the aux hydro stuck on?..........did you just service it?

Is it maxed out on the lift?

antfarmer2 · Feb 13, 2015

antfarmer2 said:
Is it maxed out on the lift?

DO NOT get under it!!!!!!!!

antfarmer2 · Feb 13, 2015

antfarmer2 said:
DO NOT get under it!!!!!!!!

Rams might be in a bind

Andrea · Feb 13, 2015

antfarmer2 said:
Rams might be in a bind

Not the aux hydraulic, that was on before this happened. Replaced a line, filled the fluid, it will drive and the bucket will tilt but no up and down. Its at a guys house (who has a garage!) he has the bucket up some how, might have done it with his tractor but its stuck up and he thinks its air locked. He knows not to go under it!! Is there a by bass/relief valve to bring the arms back down?

antfarmer2 · Feb 13, 2015

Andrea said:
Not the aux hydraulic, that was on before this happened. Replaced a line, filled the fluid, it will drive and the bucket will tilt but no up and down. Its at a guys house (who has a garage!) he has the bucket up some how, might have done it with his tractor but its stuck up and he thinks its air locked. He knows not to go under it!! Is there a by bass/relief valve to bring the arms back down?

Are you telling me the aux hydro is engauged?

Andrea · Feb 13, 2015

Andrea said:
Not the aux hydraulic, that was on before this happened. Replaced a line, filled the fluid, it will drive and the bucket will tilt but no up and down. Its at a guys house (who has a garage!) he has the bucket up some how, might have done it with his tractor but its stuck up and he thinks its air locked. He knows not to go under it!! Is there a by bass/relief valve to bring the arms back down?

The guy is going to max out lift by using his tractor to lift my bucket... then what do we do? I was told there is no check valve or bleeder on it. I also heard to put the whole thing up on blocks and run it forward/ back and keep tilting bucket to help work out any air pockets.... is this true? Would that help?

Andrea · Feb 13, 2015

Andrea said:
The guy is going to max out lift by using his tractor to lift my bucket... then what do we do? I was told there is no check valve or bleeder on it. I also heard to put the whole thing up on blocks and run it forward/ back and keep tilting bucket to help work out any air pockets.... is this true? Would that help?

Aux is off now. At first nothing worked then we realized it was on by accident. Shut it off but only tilt works.

antfarmer2 · Feb 13, 2015

Andrea said:
The guy is going to max out lift by using his tractor to lift my bucket... then what do we do? I was told there is no check valve or bleeder on it. I also heard to put the whole thing up on blocks and run it forward/ back and keep tilting bucket to help work out any air pockets.... is this true? Would that help?

Yes that is a safe way to work the air out.....is your aux hydro worked by the right stick by going back and forth?

antfarmer2 · Feb 13, 2015

antfarmer2 said:
Yes that is a safe way to work the air out.....is your aux hydro worked by the right stick by going back and forth?

The aux hydro can do some strange things

antfarmer2 · Feb 13, 2015

antfarmer2 said:
The aux hydro can do some strange things

You could chain the bucket up with the loader and loosen the lines and see if it will drop with the loader but think he might have put the rams in a bind by lifting to high

jerry · Feb 13, 2015

antfarmer2 said:
You could chain the bucket up with the loader and loosen the lines and see if it will drop with the loader but think he might have put the rams in a bind by lifting to high

If it has aux hydraulics operated with a switch rather than the steering lever put a loop hose from coupler to coupler on the aux. If that cures it you have crud in one of the solenoid operated valves. It works on 853 but yours is a completely different machine.

jerry · Feb 13, 2015

jerry said:
If it has aux hydraulics operated with a switch rather than the steering lever put a loop hose from coupler to coupler on the aux. If that cures it you have crud in one of the solenoid operated valves. It works on 853 but yours is a completely different machine.

On the 853 with sticky solenoid the boom/ bucket would go up when no one was in the building and the loop hose fixed it temporarily.

antfarmer2 · Feb 13, 2015

jerry said:
On the 853 with sticky solenoid the boom/ bucket would go up when no one was in the building and the loop hose fixed it temporarily.

Good idea Jerry

spitzair · Feb 13, 2015

antfarmer2 said:
Good idea Jerry

You said a hose was replaced. Which hose was this? Could it be that it was a hose on the lift cylinders and that it was hooked up to the wrong end? I rebuilt one lift cylinder on my 732 and got the hoses on that side mixed up. The cylinders of course opposed each other and the lift arms wouldn't go up or down. Hope this helps.

Tazza · Feb 13, 2015

spitzair said:
You said a hose was replaced. Which hose was this? Could it be that it was a hose on the lift cylinders and that it was hooked up to the wrong end? I rebuilt one lift cylinder on my 732 and got the hoses on that side mixed up. The cylinders of course opposed each other and the lift arms wouldn't go up or down. Hope this helps.

I don't believe these machines can get air locked. If the aux hydraulics are engaged, you will have issues like this. The 843s aux hydraulics are done with the right steering lever, no fancy electronics to get in the way.

Andrea · Feb 25, 2015

Tazza said:
I don't believe these machines can get air locked. If the aux hydraulics are engaged, you will have issues like this. The 843s aux hydraulics are done with the right steering lever, no fancy electronics to get in the way.

So, it was the linkage and the pedals... I thought that had all been checked! It has been fixed and now its home. It worked great for a few days but now its sluggish as heck when you drive. Arms and bucket seem to move just fine. Regular hydrolic fluid is at full level, should we check and fill the gear case? Any other ideas?? Thanks

antfarmer2 · Feb 25, 2015

Andrea said:
So, it was the linkage and the pedals... I thought that had all been checked! It has been fixed and now its home. It worked great for a few days but now its sluggish as heck when you drive. Arms and bucket seem to move just fine. Regular hydrolic fluid is at full level, should we check and fill the gear case? Any other ideas?? Thanks

I belive it has case drain filters clean or change they will be cylinders off the hydro line off your motors

1983 bobcat 843B no lift, air locked??

Help Support Skidsteer:

Member

Well-known member

Well-known member

Well-known member

Well-known member

Member

Well-known member

Member

Member

Well-known member

Well-known member

Well-known member

Well-known member

Well-known member

Well-known member

Well-known member

Moderator

Member

Well-known member