Polar 115 em monitor hydraulic oil entering the chamber

the machine is not running perfectly. always stop when cutting the paper. The position of the knife is in the middle, and does not return to all positions. After I checked, it turned out that hydraulic oil had entered the motorbike compartment like the picture I sent. the room was full of hydraulic oil
can anyone help me. what should I replace?

Thanks a lot for all your help.

 

@afandi84
Hi.
Decide which oil gets into the limit switches.
Hydraulic-it is necessary to change the seals of the clutch switch piston (the gearbox crankcase will be overflowing with oil to the ventilation plug)
Transmission-change the oil seal of the crank (it stands behind the cam that is in the photo)

 

thank you for replying to my message,

Hydraulic oil comes out of the ventilation bolt at the top, where the oil is filled. I have seen that there are no leaks from under the engine. but the hydraulic oil enters the engine gear box

 

You need to disassemble the hydraulic cylinder on the gearbox at the bottom right, which is responsible for shifting the clutch. Inspection of the cylinder, piston, clutch release rod bearing will help determine the problem.
We recently repaired the Polar 92 gearbox. A long and difficult repair with the replacement of the crank shaft and the alteration of the hydraulic cylinder.

 

Thank you Mehanka Abortmaher.
I have opened the gear box you suggested. and I have replaced the piston seal with a new one. I have also replaced the open bearing.
for piston seal size 60x68x8
bearing 7307 B

thank you for helping

 

I hope you don't have to remove the gearbox for a complete rebuild

 

I replaced the black seal with engine number 205020, size 60x68x8.
hydraulic oil no longer leaks. Hopefully the seal will last a long time