MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH 4.12.2 HYDRAULIC SYSTEM - FILTER SERVICE Legend for illust. Z 20373 R Return of filter location L Leakage oil filter location (1) Mounting bolt (2) Filter cover retainer (3) Filter cover assy (4) Return- and leakage filter unit (5) Oil filler plug (6) Back-pressure valve (7) Breather filter (8) Cover (9) Gasket NOTICE The description of the hydraulic filters appears in the follow- ing sequence: G Return- and Leakage oil filters, see page 419 G Breather filter, see page 421 G High pressure filters, see page 423 G Pressure filters on central control and filter frame, see page 427 417