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Hi, I have a Jinma 354 that has developed an issue with the 3 point hitch arms. A front end loader was put on and it works fine, but the 3 point hitch arms have quit responding to any commands from the levers and are just frozen in place. The hydraulic fluid looked close to empty after the front end loader was hooked up so it was refilled but still no response from the arms. They were working fine prior to the loader hooked up, any ideas?
Thanks, Scott :scratch: -
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I do not know exactly where it is but have you checked the flow control valve it should be a round hand wheel near or underneath the seat, it should be open some and closed down depending on how much weight the arms have on them to control downward hydro. flow from the cylinders back in the sump. I believe I got that right.
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Thanks for replying back so quick.
The front end loader has quick disconnect hoses and it seems to function fine, so I’m thinking the hyd pump is working ok since it’s a closed loop system. I’ve played around with the hyd adjustment knob under the seat with no reaction. I can pretty much just lift the arms up with no real resistance from the actuator.
I’ve changed the fluid and looked inside the top cover under the seat and don’t see anything really amiss but apparently there is.
Do you happen to know how the three point hitch has fluid ported to the actuator? I didn’t hear any noise or anything even trying to move when I was running the tractor and listening for activity
Thanks, Scott :unsure: -
Not positive about your tractor but if I remember right, the 3 point piston pushes on an actuator rod that connects to the rocker arm that lifts the hitch. The cylinder can only push “up” on the hitch and relies on the weight of the hitch to push it back “down”. It is a one way cylinder and that is the reason there is no down pressure available for the hitch. Since the actuator only rests on the piston you can pick up the hitch (and rocker arm and attached internal actuator rod) without the cylinder actually moving. That would explain the low resistance feel you had.
The adjuster knob is used to control how fast the fluid moves out of cylinder when you put the control valve in the lower position. Basically just a needle valve that you can open to allow the cylinder to drain faster or slower. It should have no effect on how fast the hitch goes up.
Since the problem started when the loader was put on and you have quick connects, take the loader out of the circuit and try the 3 point to see if it goes up. If not, the loader probably has nothing to do with it.
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Oh, one more thought.
It could be that the loader control valve is dumping all the output from the pump back into the tank and there is not enough pressure to actuate the hitch.
Does the power steering still work? There probably is a priority valve that makes sure steering actuates before other hydraulics.
Here is a trick I use to get the hydraulic fluid flowing faster in the winter.
Raise the loader all the way up, then with one hand hold the 3 point lever in the raise position while lowering the loader with the other hand. On my 284 this seems to help force fluid into the hitch when it is cold. Don’t know if this will help your system or not, but it certainly won’t hurt to try and might give you some clues as to where the problem is.
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