Hydraulic Block Pressure Measuring Method - Relief Valve Test Diagram (14.2 MPa)

This document is a page from a spiral-bound service/reference manual, titled section "5 PRESSURE MEASURING METHOD." It shows a cutaway schematic of a hydraulic block containing a relief valve. The diagram labels the block's ports: P (pressure inlet from the pump), T (tank/return passage), and EF (outlet to the hydraulic cylinder). It identifies "Plug P," which is removed from the P port to connect a test pressure gauge; the plug thread size is given as R = G 3/8. A hose from the P port runs to an external pressure gauge, illustrating the gauge hookup for measuring system pressure. The key specification stated is the relief pressure: 14.2 +0.5/0 MPa, equivalent to 145 +5/0 kgf/cm² or 2060 +71/0 psi. A technician can use this page to learn where to tap into the hydraulic circuit for pressure testing, what fitting size is required for the gauge adapter, and what relief-valve pressure reading indicates a properly functioning system. The page appears to be one of a two-page set ("Pressure measuring 1 of 2") and complements a hydraulic layout diagram from the same album.