Volvo Penta D4 Series Operator's Manual page 109

Maintenance
WARNING!
Use only by Volvo Penta recommended fluid and
grade. Any non-appproved fluid may cause loss of
steering or result in damage to the components used
in the steering system.
Fluid level checks, servo pump
The steering servo tank has a transparent reservoir
which makes checking the level possible without open-
ing the cap. The fluid level must be just below the res-
ervoir neck.
If fluid filling is required the snap connector must be
removed before the cap is opened.
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