DS21 & DS21M / DS19A & DS19MA Repair Manual — Page 541

1259 ll. a) b) c) The qd) 12, Check the front valve for leakage. (gauge 0 to 3000 p.s.i.) (0 to 200 kg/cm”). Connect the front feed hole on the unit to the test bench using a tube (1), Tighten the bleed screw (a) on the test bench, Operate the pump to build up pressure to 2500 p-s.i. (175 kg/cm2), pressure gauge must not indicate any drop in pressure: if it does, the valve is defective.