Massey Ferguson 135 Hydraulic control

Hope somebody can help me with this. I brought MF 135 with a hydraulic issue. I removed the lift cover and found cracked lift cylinder. However, I don't see the pressure control valve, Tube
(Connect the both) and the diaphragm. Only Control dashpot is there. What is the purpose of those 3? what will happen if I don't install the pressure control vale, Diaphragm and tube? Thank
you. (dashpot P/N is 898159 M2
My Tractor S/N 9A 112985 MF 135 Diesel with a Fwd & Reverse Shuttle control (Hand controller to use with clutch)
I can provide more information and picture if needed.
 
The 135 came with or without pressure control. If the stand pipe is straight and has no block on it you don't have pressure control therefore not need for any of the pressure control parts. But with a cracked lift cylinder it make me wonder if you have a relief valve installed in the pump. With the solid stand pipe installed you have no pressure relief unless one is installed in the pump. I have seen tractors split the rear housing and top cover when the pump was replaced and no relief valve installed. Do your lever have the position control lever with pressure control on it? Someone may have removed parts of the pressure control, that would be why some parts are missing.
 

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