For hydraulic operation of the levelwind, a control valve (26) is mounted to the side of the levelwind frame.
The ball valve (21) can be opened to bypass the control valve, and thus allow freewheeling of the levelwind
motor. For normal hydraulic operation, the ball must remain closed.
A dual relief valve (16) is provided to protect the levelwind motor and structure from overloads.
The levelwind hydraulic circuit is set for a minimum pressure of 300 psi. THE RELIEF SETTINGS
MUST NOT BE INCREASED ABOVE 300 PSI.