amigo ya di con la solucion la publicare por si otros la necesitan
Código HTML:
Note: Eloquent will also assume that each table has a primary key column named id. You may define a primaryKey property to override this convention. Likewise, you may define a connection property to override the name of the database connection that should be used when utilizing the model.
Código PHP:
lass Cliente extends Eloquent implements UserInterface, RemindableInterface {
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'cliente';
protected $primaryKey='id_cliente';
}
solo se debe sobreescribir la variable primaryKey en el modelo
para asi poder utilizar el medoto find(1), sin nigun problema.