Hi friend,

Max gave us a very helpful experience on this truck model but unluckily for you since it is not the case.
If I were you, I will do step by step:
- Open the hydraulic pipe output from the pump: to check if oil pressure out put is strong enough. If no, you have to check the motor current if increase enough (you should use the DC Ampemeter to measure and compare with the norminal A of the truck)? or the pump has problem (you have changed the new pump). If yes, go to the next step
- Open and Check the oil out put from the pipe which connected to the block valve and the oil output from the bock to see if the block valve is blocked or not.
- If everything is normal, you can get the oil pressure from all above mentioned test points. The only thing remain is the pistong seal kit of the cylinder.

Good luck my friend.
Nuna