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| Illustration 1 | g01245825 |
A flushing valve is located on the end of each winch motor. The flushing valve consists of a relief valve and a valve spool. When the valve spool shifts, oil will flow from the low pressure side of the winch circuit. This oil flows through an orifice. The oil then flows through the relief valve at the pressure setting of the relief valve. The orifice controls the amount of oil flow. The relief valve controls the pressure of this oil flow. As a result, the flushing valve limits the minimum pressure in the low pressure side of the winch circuit.
The flushing valves allow some of the oil from the low pressure side of the winch circuit to return to tank. This flow removes contaminants that enter the winch circuit or the contaminants that are created within the winch circuit. This flushing oil also removes hot oil that can be generated in the winch circuit.
When the control lever is in the NEUTRAL position, the flushing valve is in the center position because the raise and lower sides of the winch circuit are equally pressurized.