Maintenance and servicing work 3.18 Checking hydraulic pressure lines Safety instructions regarding pressure line checks Danger! Caution when checking hydraulic lines, especially when searching for leaks Hydraulic oil escaping under high pressure can penetrate the skin and cause serious injuries. Always consult a doctor immediately, even if the wound seems insignificant – otherwise serious infections could set in! Always observe the following instructions: • Retighten leaking screwed fittings and hose connections only when the system is not under pressure; i.e. release the pressure before working on pressurised lines! • Never weld or solder damaged or leaking pressure lines and screw connections. Replace damaged parts with new ones! • Never search for leaks with your bare hands, but wear protective gloves! • Have damaged flexible lines replaced by authorised workshops only!
4 Q/11
Fig. 44: Hydraulic hose identification
Serv-HB 34900/01 – Edition 1.0 * 34901_0320_Wartung.fm
The entrepreneur/owner of the machine must ensure that flexible lines are replaced in appropriate intervals, even if no safety-relevant defects can been detected on the flexible line. Flexible lines must be inspected by an expert (competent person) before the first commissioning, and then at least once a year for safe working condition. • Leakages and damaged pressure lines must be immediately repaired or replaced by an authorised workshop or after-sales staff. This not only increases the operating safety of your machine but also helps to protect the environment • Replace hydraulic hoses every 6 years after the date of manufacture, even if they do not seem to be damaged In this respect, we recommend that you observe all the relevant safety regulations for hydraulic lines, as well as the safety regulations regarding accident prevention and occupational health and safety in your country. Also observe DIN 20066, part 5. The date of manufacture (month or quarter and year) is indicated on the flexible line. Example: The indication “4 Q/11” means manufactured in the 4th quarter of 2011.
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