MAINTENANCE 5. When adding hydraulic oil, always use the same brand of oil; do not mix brands of oil. As the machine is filled with Super EX 46HN when it is shipped from the factory, use it as a general rule. When selecting to use another brand of oil listed in the table “Brand names of recommended hydraulic oil”, be sure to completely replace the oil in the system. 6. Do not use hydraulic oils other than those listed in the table “Brand names of recommended hydraulic oil”. 7. Never run the engine without oil in the hydraulic oil tank. 7-37