Hydraulic tank fill system

Abstract

A hydraulic tank fill system for a machine includes a tank, a valve operatively coupled to the tank, and a supply line in communication with the valve and the tank. The supply line supplies a fluid into the tank from a fluid source. A breather device installed on a top portion of the tank exerts a pressure on the fluid in the tank for controlling at least one of an operating pressure associated with the tank. A vent line in communication with the valve and the top portion of the tank to receive an excess quantity of the fluid based on the exertion of pressure on the fluid in the tank. An orifice disposed in the vent line exerts a back pressure on the excess quantity of the fluid received into the vent line.

What is claimed is: 
     
         1 . A hydraulic tank fill system for a machine, the hydraulic tank fill system comprising:
 a tank configured to store a fluid;   a valve operatively coupled to the tank;   a supply line in communication with the valve and the tank, the supply line configured to supply the fluid into the tank from a fluid source;   a breather device installed on a top portion of the tank, the breather device configured to exert a pressure on the fluid in the tank for controlling at least one of an operating pressure associated with the tank;   a vent line in communication with the valve and the top portion of the tank, the vent line configured to receive an excess quantity of the fluid based on the exertion of pressure on the fluid in the tank; and   an orifice disposed in the vent line, the orifice being sized such that the orifice is configured to exert a back pressure on the excess quantity of the fluid received into the vent line.