COMPONENT OPERATION / Others (Upperstructure) FAN VALVE The fan valve (standard) consists of make-up valve and relief valve. The make-up valve prevents cavitation in the circuit and the relief valve prevents surge pressure and overloads in the circuit. The fan valve (optional) consists of make-up valve, relief valve and solenoid valve. The make-up valve prevents cavitation in the circuit and the relief valve prevents surge pressure and overloads in the circuit. When the solenoid valve is shifted, pressure oil from the fan pump (port P1) is shifted to port M1 or M2. Therefore, rotation of the fan motor is switched to for- ward or reverse rotation.
Fan Valve (Standard) Port M1 Port M2 Relief Valve T1J1-03-07-003 Fan Valve (Optional) Port P1 Port T1 Solenoid Valve Port M1 Port M2 Port PP Port P1 Port T1 T1J1-03-07-004 Relief Valve T3-7-7