I've got a 773 Bobcat skidsteer. When I go to attach the grapple or backhoe hydraulic lines I often find that pressure has built up on one side or the other so I can't connect the flat faced connectors without unscrewing one or the other to bleed off a little hyd. fluid. Is there any sort bleeder fitting I could install in the hyd lines to bleed off the pressure rather than having to unscrew a connector?
- Thread starter Rance
- Start date
Determined
Well-known Member
I used to get oil all over the place when changing implements, this is what I do now:
Removal:
Unhook implement
Shut the engine off
Cycle levers to release pressure
Disconnect hoses
Install:
Hook up to implement
Shut off engine
Cycle levers to release pressure in lines
Hook up hoses
When I hook on to something with my 970 and need hydraulics for it, because the loader needs to remain raised, pressure is present in the hose and it can not be connected.
The tilt function does not have enough weight on it to hinder connecting so I connect these hoses first then drive over to a round bale or whatever is handy and forward tilt until the bucket or spike contacts and takes the load/pressure off the lift cylinders.
Shut down tractor, cycle levers to release pressure then connect.
Removal:
Unhook implement
Shut the engine off
Cycle levers to release pressure
Disconnect hoses
Install:
Hook up to implement
Shut off engine
Cycle levers to release pressure in lines
Hook up hoses
When I hook on to something with my 970 and need hydraulics for it, because the loader needs to remain raised, pressure is present in the hose and it can not be connected.
The tilt function does not have enough weight on it to hinder connecting so I connect these hoses first then drive over to a round bale or whatever is handy and forward tilt until the bucket or spike contacts and takes the load/pressure off the lift cylinders.
Shut down tractor, cycle levers to release pressure then connect.
mtf
Member
- Location
- Bottom of the Bluegrass State
You should have either have a button to push or turn the key back to relieve auxiliary pressure. It should be labeled. On the newer models, you simply push the couplers in to release pressure.
Problem is not on the skidsteer side, its with the attachment. For example, the backhoe: When sitting unattached to the skid it will settle. You'd think that moving the controls would relieve the built up pressure but it doesn't. The grapple has no controls to move, and even unconnected with the claws down will build pressure, especially if the sun hits it. The manuals for both say this is common and to unscrew a fitting to relieve pressure. I'm looking for a fitting that has a bleeder built into it so I don't have to unscrew the fitting itself. Guess it might be something I have to invent.
I also have a 773G. It has the push button to relieve the pressure. When you press it in and hold it for about 3-4 seconds it shuts the engine down. At least 90% of the time they will then hook up even if have been sitting and got hot. If there is pressure I can get at least one side coupled and then press the button again and the other side will couple up. I have had this unit almost 15 yrs and switch attachments quite often. Have never had to bleed it yet. But the first time may be coming. Lee
I don't know if a backhoe attachment would be that much different, but what I always tell my customers to do with their buckets, grapples, etc is to hook both sides of the coupler together. This insures pressure within the attachment doesn't build, but instead equalizes, and also protects both coupling ends from contamination.
Posting a reply to my own question in the hope that it might help others. I did more research and found this is a pretty common problem. Several manufacturers already make a coupling with built in pressure relief so I guess I won't get rich by inventing one. Holmbury Hydraulics has a nifty video on theirs.
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