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I have a 743 bobcat that the hydraulic oil is essentially foaming. all controls are working except for forward and reverse

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Posted on Jan 02, 2017

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SOURCE: on my bobcat 743 how can i bleed air from my hydraulics

Most hydraulics will self bleed by using them. For some cylinders you can position them so that one inlet will be at physically at the top, actuate that set so that it fills the cylinder on the upper end, let it settle for a few seconds to allow air to move to the top, then actuate it the other way, pushing the oil and air out the top. Reverse the cylinder position so that other end is at top and do it again, fill cylinder from top and allow air to rise then actuate it to push air and oil out again. Repeat several times.

I know you can't get all cylinders to a vertical position so that you have a true top and bottom but the idea is to get one cylinder inlet up while the other is down and the reverse the position.

Other portions of the hydraulic system should bleed all air out of the as you use it or will have bleed ports that allow small amounts of air out and you shut them when oil comes out, such as brake and clutch systems.

If you continue to get lots of air in the system you have a leak on the suction line from the tank to pump.

Posted on Aug 27, 2012

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My husband is too proud to ask this silly question. But where/which one is the inlet valve and outlet valve on a bobcat 743b


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My Bobcat 3023 trencher backhoe has no forward or reverse although all the hydraulics work on the implements. This happened with 10 minutes of the unit being fully operational. Any answers for this?


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index-cnv45y4o4rr11btflvivr30k-3-0_1.jpg

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I added diesel to the hydraulic tank in my bobcat and never an it. I drained the tank, refilled it, and now the hydraulic system wont work.


You should use hydraulic oil, not diesel, drain it, refill it and if necessary bleed all the air from the system (some are self bleeding) Dependant on the type of hydraulic system you may have damaged the seals by using diesel oil, that, unfortunately is expensive.

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Bobcat 641 skidsteer hydraulic problems.


That's one of the first things that came to mind as I was reading through your post; that the system was air-bound. Are there bleeder valves on the system?

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On my bobcat 743 how can i bleed air from my hydraulics


Most hydraulics will self bleed by using them. For some cylinders you can position them so that one inlet will be at physically at the top, actuate that set so that it fills the cylinder on the upper end, let it settle for a few seconds to allow air to move to the top, then actuate it the other way, pushing the oil and air out the top. Reverse the cylinder position so that other end is at top and do it again, fill cylinder from top and allow air to rise then actuate it to push air and oil out again. Repeat several times.

I know you can't get all cylinders to a vertical position so that you have a true top and bottom but the idea is to get one cylinder inlet up while the other is down and the reverse the position.

Other portions of the hydraulic system should bleed all air out of the as you use it or will have bleed ports that allow small amounts of air out and you shut them when oil comes out, such as brake and clutch systems.

If you continue to get lots of air in the system you have a leak on the suction line from the tank to pump.

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