hydraulic leaking: Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review hydraulic leaking: 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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 01-13-2011, 18:46 Post: 176386
lobstermen



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 hydraulic leaking

hi i have a farm pro 2420 if your sitting on the seat and look down there is a a screw valve it just started leaking. i think i read in some forms its a flow valve and if i tighten it so it stops leaking it binds the hydrolics.Any suggestions?Or any Idea what i should do ?






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 01-13-2011, 23:38 Post: 176394
greg_g



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That's the flow control valve, it regulates how fast the rear lift drops. And it's a needle valve, so the answer depends upon where it's leaking. See the diagram below If it's leaking under the knob (#1), it's likely either a dirty valve seat (beneath #7) or a bad O-ring (#5). If it's leaking elsewhere, please describe. Caution; remove set screw (#8) before turning out the valve. You may have to scrape away dirt and/or paint to actually find it. Then don't lose it, it's pretty small.

//greg//





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Jinma Farmpro Agracat: hydraulic-leaking

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 01-14-2011, 00:36 Post: 176395
lobstermen



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hi greg if i take the set screw out will flow control valve screw out so i can clean it or see the o ring is broke its leaking out around the theads on the flow valve






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 01-14-2011, 01:14 Post: 176396
lobstermen



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hi greg i drained the oil out of the hydraulic sump and it looks dark my tractor has a spin on filter i read there is a filter in the sump i took the plat off that is under the seat no filter i read one of your post that there was filters in the sump






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 01-14-2011, 07:44 Post: 176399
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Yes, the set screw is there so vibration won't cause it to accidentally screw out.

As to the filtration, there's no consistency. Some have one or the other, some have both. In some cases it depends upon which line was cut for the spin-on. If it's on the return side, you'd still need a suction strainer in the sump. If it's on the supply side, the spin-on IS the suction filter. Also; take care when you buy spin-on replacements. If yours is on the supply side, it's got to be coarse as not to impede flow to the pump. Buy in the 120-140 micron range. So technically that's still a screen, albeit inside a can. If yours is on the return side, you can buy a regular filter, somewhere in the 10-30 micron range.

Spin-on models still don't like water either, but don't self-destruct as quickly as the in-tank versions when wet.

//greg//






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 01-14-2011, 09:05 Post: 176400
lobstermen



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hi greg the filter it on the steal line going into the pump i,m sorry for asking so many question its my first tractor and i dont no anything about them give me a boat i can do something with it Laughing out loud Laughing out loud thanks again greg






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 01-14-2011, 10:00 Post: 176402
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Then what you have is the external equivalent of the in-tank suction screen, which should probably be changed at least once a year. Easiest way is simply to buy OEM replacements. If that's not possible, you must select an aftermarket replacement on the basis of
a. thread diameter
b. thread count
c. sealing ring diameter
d. micron rating (coarse, as stated above)

What I can't tell you from afar - is whether or not your filter head is equipped with a bypass valve. On that count, it might not hurt to also ensure that the replacement spin-on itself is equipped with its own bypass valve. One more argument in favor of simply buying OE replacements

//greg//






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 01-14-2011, 11:14 Post: 176404
lobstermen



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hi greg so where do i find the suckion screan in the sump i looken up the seat i took the 3 bolts plate off there is nothing up that is there any other place to find it thanks again greg






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 01-14-2011, 14:15 Post: 176410
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Nope. If you've removed the 3-bolt flange completely - and nothing but a suction tube came out - then your external spin on is the only filtration. And since it's on the suction side, technically it's an external suction strainer - as opposed to a "hydraulic filter". So when you shop for your yearly replacement, that's what you need to buy; a spin-on suction strainer.

//greg//






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 01-15-2011, 10:41 Post: 176422
lobstermen



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hi greg thanks again i change the oil and filter works great the hyd oil that can out of the sump was brown realy dark i put a new o ring in the flow control valve and were good to go thanks again for the help i happy that there is a site like this help guys like me that dont no shit about a tractor






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

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