THEORY OF OPERATION - CONTINUED
HYDRAULIC SYSTEM - CONTINUED
Control Valve (Auxiliary).
In the HOLD position, springs (9 and 24) hold the spool (25) in the centered position. No pilot oil enters the con-
trol valve through ports (11 and 22). 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 (15).
Passage (15) 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.