MAINTENANCE 4.13 EVERY 2000 OPERATING HOURS OR YEARLY 4.13.1 HYDRAULIC SYSTEM - CHANGE OIL, REPLACE SUCTION STRAINERS AND PULSATION DAMPER NOTICE The hydraulic oil change intervals can be extended for a fur- ther time period, when an oil sample analysis shows a posi- tive result. When extending the oil change interval, it is necessary to carry out an oil sample analysis after every 1000 operating hours. However, it is recommended to change the hydraulic oil after 6000 operating hours at the latest. Legend for illust.
Z 21782 (1) Main oil reservoir (2) Oil filler plug (3) Back-pressure valve (4) Return oil collector pipe (5) Drain coupling for collector pipe (6) Drain coupling for main oil reservoir (7) Hand wheel of main shut-off valve (8) Main shut-off valve (9) Compensator between main oil reservoir and suction oil reservoir. Check condition and tightness of com- pensator and connected parts. (10) Return oil strainer (11) Bolt (12) Bolt (13) Intermediate pipe (14) Gasket (15) Gaskets Evacuate main hydraulic oil reservoir according to section "Central Refilling System" on page 256. Attach drain hose (part of tool set) to coupling (5) and drain oil from return oil collector pipe (4).
Drain also the oil from return oil manifold, see illustration Z 21785 and from suction oil reservoir, see illustration Z 21787. REMARK Replace return oil strainer (10), illustration Z 21782 after major repairs on the hydraulic system and after every 6000 oper- ating hours. Use new gaskets (14 and 15). With hydraulic oil reservoir empty, service the return oil filters and inspect the reservoir for sediments. Clean the reservoir if neces- sary. 439