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Fig. 3: Selection diagram for viscosity ranges with straight fluids, i.e. viscosity index 100
Bosch Rexroth AB, Installation and maintenance manual, Hägglunds DOb, RE 15327-WA/05.2017
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5.5 Requirements for hydraulic fluid cleanliness
The drive units are equipped with filters on the drain line and return line. In order
to obtain stated service life it is important to follow recommendations concerning
cleanliness levels and maintenance.
Cleanliness level recommendations
• The system must be flushed before start up (see section 8.3: Flushing before start
upWhen filling the tank with hydraulic fluid it is important to fill through the special
oil filler connection (see 8.2: Filling up the system with hydraulic fluid).
• For industrial applications the contamination level should not exceed ISO
4406:1999 18/16/13.
• Have a water content of <200 ppm (0,02%).
• Always use filter elements recommended and supplied by Bosch Rexroth.
• The hydraulic fluid should be analysed according to the special maintenance
intervals for your specific drive unit or the maximum intervals on the maintenance
chart (see Table 11: Maintenace chart). Be particularly vigilant when removing
equipment for repairs or maintenance, dirt must not be allowed to enter the
system, clean prior to opening and plug open connections.
Dirt in oil
Damage on equipment
▶
Do not re-use hydraulic fluid which has leaked out.
NOTice
DD00082885
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