not familiar with jinma but my john deere is having the same problem. see if there is a filter screen in the sump area. if it has a screen filter then it is probly plugged. the hydralic fluid has to go through the screen before it goes anywhere else.
I just recently aquired the tractor from a family member. he said the tractor had been setting up about 10 months. I think it was a lot longer than that. when i got it it would not run. Had to replace the fuel pump. then the hydraulics were very jerky when operated. I drained the fluid and...
My suction screen on my hydralic system is plugged with some debre and i need to flush the system. how can i do that and what is best to use to do that.