INTRODUCTION SYNTHETIC BIODEGRADABLE OIL TYPE HEES On machines in which the synthetic biodegradable oil type HEES is used, the following operations are to be per- formed together with the standard maintenance operations: After the first 250 hours of operation, change the hydraulic circuit drain filter. IMPORTANT When changing the oil filters (cartridges), check their innner part to make sure that there are no depos- its. If abundant deposits are observed, find out what may have caused their accumulation before starting the machine. After the first 500 hours of operation, change the hydraulic circuit oil and the intake filter. The number of operating hours is indicated by the hour meter. 6