MAINTENANCE 4.10 EVERY 250 OPERATING HOURS OR MONTHLY 4.10.2 UNDERCARRIAGE PIN CONNECTIONS - LUBRICATE See illustration Z 10972 Lubricate the pin connections via grease fittings (1) at center sec- tion (16 fittings; front, rear and from inside). 4.10.3 SIGNAL HORN COMPRESSOR - LUBRICATE See illustration Z 10689 The compressor (2) is located in the cab base. Fill several drops of thin oil into the lubricator (1). The oil must be free from resin and acid and must have the lowest solidifying-point possible (below - 40° C). NOTICE If the Excavator is equipped with a second signal horn there is also a second compressor which has to be lubricated in the same way as the first one.
4.10.4 HYDRAULIC OIL COOLER FAN BEARINGS - CHECK FOR LEAKAGE AND CLEAN BREATHER FILTER See illustration Z 21659 Check housing (1) for leakage. If leakage is found, check the oil level in the bearing housing. Remove oil level plug (2). The oil level should be at lower edge of the opening. If necessary add oil through the breather filter adapter pipe. Clean breather filter (3) with compressed air from inside to outside and install plug (2) and breather filter (3). Oil loss of the bearing housing indicates worn or damaged seal rings. To prevent damage to the fan bearings, install new seal rings.
4.10.5 RADIATOR FAN BEARINGS - CHECK FOR LEAKAGE AND CLEAN BREATHER FILTER See illustration Z 21660 Check housing (1) for leakage. If leakage is found, check the oil level in the bearing housing. Remove oil level plug (2). The oil level should be at lower edge of the opening. If necessary add oil through the breather filter adapter pipe. Clean breather filter (3) with compressed air from inside to outside and install plug (2) and breather filter (3). Oil loss of the bearing housing indicates worn or damaged seal rings. To prevent damage to the fan bearings, install new seal rings. 349