MAINTENANCE H. HYDRAULIC RETURN FILTER Change the hydraulic tank return filter on a new machine after the first 50 hours of engine opera- tion then change every 500 hours. Remove cap to release hyd. tank pressure NOTE One new hydraulic return filter is shipped with the ma- chine in the support kit. This is to be used at the 50 hours filter change. Move machine to firm level ground and place attachment in hydraulic oil check position. FIGURE 4.30A Slowly loosen bolts and remove cover 4 SK32001028 1. Release hydraulic tank pressure. See Figure 4.30A. WARNING NEVER CHANGE OILS OR FILTERS ON A MACHINE THAT HAS JUST FINISHED WORKING.
ALLOW MA- CHINE TO COOL FIRST UNTIL OILS AND FLUIDS ARE WARM NOT HOT. RELEASE HYDRAULIC TANK PRESSURE BEFORE WORKING WITH ANY HY- DRAULIC COMPONENT. FIGURE 4.30B BOLT SPRING WASHER COVER 2. Remove the six mounting bolts from the hydrau- lic return cover plate. See Figure 4.30B. O-RING CAUTION SPRING Slowly remove the mounting bolts. The filter cover plate is under spring tension. BYPASS VALVE 3. Remove “O”-Rings, filter springs and bypass valves. See Figure 4.30C. 4. Remove the filter from the housing. See Figure 4.30C. 5. Install new filter, bypass valve and spring into housing. 6. Install New “O”-Ring, KOBELCO Part Number ZD11G20000. Lubricate “O”-Ring before installing. 7.
Install cover plates and torque mounting bolts to proper value. Refer to Specifications Section for torque value. FILTER FIGURE 4.30C 4-30 SK210(LC)/SK250(LC)–VI Dynamic Acera OM, 09/00 Rev.2