Air in hydro system: Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review Air in hydro system: Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Jinma Farmpro Agracat Forum

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 10-25-2010, 12:39 Post: 174753
daryld3



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 Air in hydro system

I am having trouble with a great deal of air in the hydro system to the point of oil blowing out the vented tank cap holes. I cant locate any leaks elseware, is it likely that the pump is the cause? Any help would be appreciated






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 10-25-2010, 13:31 Post: 174754
Murf



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 Air in hydro system

Usually air in the hydraulic system is the result of one of two things, a clogged intake screen is causing cavitation, or there is a small leak on a return line somewhere and it's sucking in air.

Either way the end result is hydraulic fluid which is full of air bubbles is getting back to the reservoir and since the air occupies space, it pushes the liquid level up to the point of overflow.

The easy check to see if this is the case is to run the machine a bit, then shut it off and park it and quickly check the fluid level, then let it sit for a few hours and check it again. If there is much air in the fluid the level will have dropped quite a bit after sitting. This is caused by the air bubbles rising to the surface.

Best of luck.






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 10-25-2010, 13:42 Post: 174755
greg_g



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 Air in hydro system

In addition to what Murf contributed, any leaks that would cause air in the system would be suction leaks (as opposed to pressure leaks). Under normal operating conditions, you won't see them. Rather than leaking fluid (pressure), they'll be sucking air. In these cases, the usual culprit is simply a loose fitting. In rare cases, air will be suctioned from a sump that's too low on fluid. But you'll usually experience other hydraulic problems before that happens.

Plus, it might not be air in the system in the first place. Start the tractor, push the seat forward, and remove the vent/fill plug. Look for bubbles on the dipstick. Shine a light in the fill hole and look for moving fluid and/or bubbling. If you see none of the above, your problem might simply be an overfull sump.

On mine, there's only 1 mark on the little dipstick. I consider that the full mark. You check the fluid level by just setting the plug on the hole, do not screw it back in. All Asian threaded dipsticks are gauged that way. I only add hydraulic fluid when the dipstick comes out dry, and then only to that mark. Any higher than that, and it bleeds out the vent holes when I drive uphill.

//greg//






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 10-25-2010, 13:53 Post: 174756
daryld3



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 Air in hydro system

Thanks Murph!

Where is the intake screen?






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 10-25-2010, 14:40 Post: 174759
Murf



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 Air in hydro system

Quote:
Originally Posted by daryld3 | view 174756
Thanks Murph!Where is the intake screen?



I can't tell you much other than 'in the reservoir' but "greg_g" is the expert on those units, I'm sure he'll step in with the details for you.

I would just add a little to Greg's reference to the dipstick mark in case you don't know. You must check the fluid level with everything in the down / retracted position. I.E. 3pth all the way down, and all loader cylinders (if equipped) in the fully retracted position. That way you're not being fooled about the level by oil in cylinders.

Best of luck.






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 10-25-2010, 18:15 Post: 174766
greg_g



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 Air in hydro system

From the operator seat look down and to the left. Follow a steel line that makes a 90 degree bend into the hydraulic sump under the seat. Note that it goes through a 3 bolt flange. Disconnect the hardline, remove that flange, the suction screen is underneath.

And I want to reiterate a point about fluid levels, just in case it was missed in my earlier response. Your hydraulics use a threaded dipstick. Most folks who've never owned Asian equipment before don't realize that you don't screw the threaded dipsticks back in to check levels. Unscrew it, remove it, wipe it. Re-insert, but only set it on the hole. Remove immediately and observe fluid level. Threading it back in to obtain a level reading only results in overfilling the sump, which leads to a mess on the backside of the tractor.

//greg//






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 10-25-2010, 18:21 Post: 174767
daryld3



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 Air in hydro system

Thank You!






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Discussion Boards > Active Subjects > Messages as Posted > Jinma Farmpro Agracat Forum

Thread 174753 Filter by Poster:
daryld3 3 | greg_g 2 | Murf 2 |

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