Bobcat 610 Hydraulics

[TimHerb]

Short story. Changed seal on lift cylinder, pretty simple thing. Leak fixed and fluid topped off. However hydraulics now are very jerky and very slow. Ran through each cylinders range to clear out any air more than 2 dozen times with no luck. Can it be a coincidence that the hydraulic pump went bad at the same time. Kind of lost what to do next. thanks Tim.

 

[oldreliable]

I had a similar problem with my Bobcat M500. I was informed to check for leaks on the low pressure side of the hydraulic system. Found and fixed a few leaks and the problem persisted, what I had discovered later was that the line between the hydraulic filter housing and the vacuum guage had rusted and was drawing air into the system. Replaced the line and the problem was solved.

 

[OldMachinist]

I had a similar problem with my Bobcat M500. I was informed to check for leaks on the low pressure side of the hydraulic system. Found and fixed a few leaks and the problem persisted, what I had discovered later was that the line between the hydraulic filter housing and the vacuum guage had rusted and was drawing air into the system. Replaced the line and the problem was solved.

Sometimes it takes a while to work all the air out of the system. Try running it at 1/2-3/4 throttle and drive it around while lifting/tilting the bucket. Do not run the cylinders to the end of stroke as it will cause cavitation when the oil with air in it opens the system relief valve. Let it sit several hours or overnight to let the air in the tank settle and then repeat. If after doing this three or four times the problem persists I'd start looking for a leak on the suction side of the hydraulics.

 

[OldMachinist]

Sometimes it takes a while to work all the air out of the system. Try running it at 1/2-3/4 throttle and drive it around while lifting/tilting the bucket. Do not run the cylinders to the end of stroke as it will cause cavitation when the oil with air in it opens the system relief valve. Let it sit several hours or overnight to let the air in the tank settle and then repeat. If after doing this three or four times the problem persists I'd start looking for a leak on the suction side of the hydraulics.

Just noticed you said it was a 610 so you don't have to drive it around since you have clutch drive instead of hydrostatic.

 

[mechtech]

You got manuals?
If you need manuals, let me know

 

[TimHerb]

THANKS!!!!!!!! I appreciate everyone's input. Problem Fixed. I indeed had a vacuum leak from the vacuum gauge to the hydraulic filter. Never would have figured that one out. thanks again. Tim