Return to Master Table of Contents Start the engine and turn the engine speed dial to maximum. When normal operating temperature is reached, adjust screw 2 clockwise to shft the Pi-Q control valve curve decrease componsating control pressure. Q 1/2 turn on the adjusting screw is equal to approximately -0.7 kgf/cm 2 of Pi. NOTE: For each full turn of adjustment on the screw (2), the square- tipped adjusting screw should be turned in the opposite direction turns to avoid changing inner spring adjustment. ATS0850L Figure 13 Pi Pump input power adjustments are normally made in small increments, 1/4 turn (90°) or less, each time.
Q Turning the screw (3) clockwise shift Pd-Q curves right and increase input horse power. 1/2 turn on the screw (3) is equal to approximately +33 kgf/cm 2 of Pd. Pd ATS0870L Figure 14 The adjusting screw (1) affects the delivery rate (Q) of the pump. Turning the adjusting screw shift the maximum cut flow (as shown in Figure 15). Q Balance both pumps for equal output. P ATS0860L Figure 15 Page 19 Hydraulic System Troubleshooting, Testing and Adjustment