COMPONENT OPERATION / Hydraulic Fan Motor REVERSE CONTROL VALVE Fan motor is reversed by operations of the reverse control solenoid valve and the reverse spool. Operation At Neutral of Reverse Control Solenoid Valve 1. When reverse control solenoid valve (1) is at neutral, the pressure oil (P) from the fan pump is blocked by changeover valve (2). 2. As reverse spool ( 3 ) is being pushed by spring (4), the pressure oil (P) from the fan pump flows to port MB, and the fan motor rotates normally. In Operation of Reverse Control Solenoid Valve 1.
When reverse control solenoid valve (1) is operated, the pressure oil from the fan pump flows to the right end of reverse spool ( 3 ) through changeover valve (2). 2. When the pressure oil entering the right end of reverse spool ( 3 ) overcomes the spring (4), reverse spool ( 3 ) moves leftwards. 3. Pressure oil (P) from the fan pump flows to port MA, and the fan motor makes reverse rotation. T3-3-8