GN shale shaker vibrator is Italy Oli brand vibration motor, which is with good quality and stable performance.
Linear motion shale shaker utilized 2pcs same power vibration motor, for example, GNZS703 use 2pcs 1.5KW vibrator. Their installation method is vertical. 
Balanced elliptical motion shale shaker use 2 pcs different power vibration motor(1 large, 1 small), e.g. GNPS703 shale shaker use 1 pc 1.94KW + 1pc 1.0kw. Their installation method is horizontal in parallel.