In June of 2004,after having been informed there went wrong with the 40T workover rig of Nanyang oilfield, our reparing people reached the spot with the spare parts in the earliest time. Our people overcame all the difficulties and very poor repairing condition of the site and bad natural surroundings and worked till very late. After three days' hard working, we completed the overhaul and adjustment for the transmission and again satisfied the urgent need of our customer. Jereh again won the full approval and high praise from the customer.