Maintenance - hydraulic system
720
25.4 High-pressure filter
Fig. 674
The high-pressure filters (1) for the working and steering hydraulics are equipped with an visual
contamination indicator (2). The contamination indicator (2) provides visual information about
the degree of contamination of the filter. During start-ups in the cold state, the button of the
contamination indicator (2) can jump out.
• Push the button back in once the operating temperature has been reached.
• If it pops out again immediately, the filter insert must be replaced.
• Check the contamination indicator each time before operating it. If necessary, replace the
contaminated filter insert. If the contamination indicator does not respond, replace the filter
insert once annually or with every oil change.
Change filter element in the high-pressure filter
Fig. 675
• Switch off the diesel engine.
• Depressurise the hydraulic system.
• Remove and clean the filter housing (3).
• Remove the filter insert (2) and replace with a new one.
• Check the O-rings (1) for damage and replace if required.
• Wet the thread and the sealing surfaces with hydraulic oil.
• Mount the filter housing (3) up to the stop, then turn back a quarter turn.
• Charge the hydraulic system with pressure and check for leaks.
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