Failing hydraulic cylinders on the riser tensioner system were to blame and without prior notice given, Apex immediately sprung into action. Based on this material was ordered that day and machining of the piston rods was carried out that night, before the cylinders had even arrived. And with only two days before drilling was due to commence ... Delivering Industrial Hydraulics. See our extensive hydraulic repair and reconditioning experience serving the markets listed below. Contact us.Learn more about Precisions hydraulic pump, hydraulic motor, hydraulic valve, and hydraulic cylinder repair and service.