THEORY OF OPERATION - CONTINUED
HYDRAULIC SYSTEM - CONTINUED
Control Valve (Lift).
In the HOLD position, the springs (9 and 26) hold spool (27) in the centered position. No pilot oil enters
the control valve through the ports (10 and 24). Any pilot oil in the pilot lines drains through the pilot
valve to the tank. The spool blocks the flow of pump supply oil in passage (16).
Passage (16) is common to all control valves in the bank valve. The passage has no outlet. The spool
blocks the flow of pump supply oil until the operator moves the pilot valve.