Hydraulic fluid full of bubbles

Forum Forums Tractor Troubleshooting Hydraulic fluid full of bubbles

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    • #30971
      pedavies
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        Been having this problem for a while. When cold my hydraulic fluid will flow out the reservoir dip stick. If I let it sit and warm up a half hour before even moving it out of the garage it will sometimes not do it but now that it is winter that rarely is the case. Once warm there are no problems. I have no leaks, not using Chinese quick connects. A while back my pump came loose and leaked oil so I re-tightened it. Perhaps I should have removed it and replaced the gasket, not leaking but my problem seems to be air getting sucked in vice fluid leaking out. 3 point takes longer to get going than it used to as well, until the fluid warms up. Any ideas? 1000 hours on the tractor.

        Paul

      • #37353
        DavidPrivett
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          make sure you have the correct fluid in the tractor some will foam up

        • #37354
          pedavies
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            Running with AW 32. Patience seems to be the key, start it and walk away for a half hour, don't move it or use any hydraulics, just let it warm up.

            Paul

          • #37357
            DavidPrivett
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              almost makes me think that you have something causing excess turbulence (maybe a restriction) .as the oil thins it reduces its effect. but that it just a wild ass guess at best.

            • #38087
              pedavies
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                Has gotten worse, happens while warming up now. Will take the line off between pump and reservoir and see if there may be anything restricting the flow. Filter is 140 micron (NAPA 1614). Pump isn't making any strange noises and once warmed up everything is working normal.

                Paul

              • #38088
                DavidPrivett
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                  if your tractors pump is internal I guess there is a chance of a suction side leak in the case. ,you would never see it. But I think most Chinese tractors have external hydro pumps. I guess that you should see a  leak somewhere after the tractor is turned off if there was a suction side leak that was the cause of the bubbles in the oil. I am wondering if maybe the oil is to blame maybe it does  not have the anti foaming agents it should or a bit of water might do it.

                • #38089
                  Tinbender
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                    Wonder if it's a stuck check valve in the filter or filter housing? Quite a few years ago there was a run of these tractors with defective plastic check valves in the filter housing that would crack and cause problems. With 1,000 hours on yours maybe something like that has happened?

                  • #38090
                    pedavies
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                      Put a new filter head on tonight. Will know if that did the trick when I start it tomorrow.

                      Paul

                    • #38095
                      pedavies
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                        Well so much for that idea, still foams up. Starts building up bubbles right away, then after about 5 minutes there are enough to come out the breather hole or right out the dipstick opening if it isn't in. After a few minutes of that it stops and the bubbles gradually disappear.

                        Paul

                      • #38106
                        pedavies
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                          Somewhere in my house I have the engine manual for the tractor but I will have to widen my search to find it. Moving often doesn't help sometimes. I discovered the bolt in the center of the hydraulic pump mounting will not tighten so my guess is that the pump shaft is doing some wobbling or this is where air is getting in. a picture would be nice so the hunt for the manual will continue unless I find one searching this site. At least I found a problem and can head towards a fix.

                          Paul

                        • #38108
                          pedavies
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                            Found the manuals but not much use for this area of the tractor. Took the pump and driver off. End of the driver was a bit rounded, just like the photo on Ranch Hand's site. Pump seems fine but am replacing it as I can not think of anything else at this point. Was good to see how the whole thing worked. Thanksgiving weekend in Canada this weekend so between new hydraulic pump, rad, hoses and thermostat, I have some work to do.

                            Paul

                          • #38111
                            Tinbender
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                              Hmmmmm Turkey! Happy Thanksgiving !laugh

                            • #38143
                              pedavies
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                                New pump didn't arrive for the weekend so I took the old one apart and cleaned everything up, put it back on and presto, no bubbles or foaming. Will keep the new one for a spare.

                                Paul

                              • #38146
                                DavidPrivett
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                                  so you took it apart and found nothing that caused your problem?

                                • #38150
                                  Affordable
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                                    It had to be loose or something causing it to suck air, glad you got it going

                                     

                                    Tommy

                                    Affordable Tractor Sales

                                    “Your Jinma Parts Superstore”

                                    http://www.affordabletractorsalesco.om

                                  • #38163
                                    pedavies
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                                      Didn't find anything and the clean up with new gaskets must have done the trick. Parts tool box that came with the tractor had the gaskets in it.

                                      Paul

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