4 OPERATION N° Dh. 314-0 : Checks and adjustments on the hydraulic clutch control. VI. CHECKING THE PRESSURE SUPPLIED BY THE HYDRAULIC SELECTOR. 22. Prepare the test bench. a) Disconnect the pipe H from the pressure gauge M1 and from the test bench pump. b) Connect the pressure gauge M2 (200 bars) (3000 PSI) to the test bench pump D by means of pipe H. 4717