Volvo Penta D4 Operator's Manual page 98

Maintenance
96
Steering
The stern drive is fitted with a hydraulic steering system
with an auxiliary servo that functions even when the
engine is not running.
Hydraulic steering, fluid level checks
Check the fluid level every two weeks so that any
changes are discovered. Check the helm pump level.
The minimum level is 12 mm (0.47") below the filler
hole lower edge. If the boat has a flybridge the lower
helm pump must not be opened; only check the level
at the upper helm station.
The fluid level does not normally alter; annual con-
sumption is negligible. If the level drops it is probably
due to leakage or air in the system. The leakage must
be traced and remedied immediately. Contact your
Volvo Penta service center for repairs.
The steering system is filled with ATF oil. If the oil is
red and does not contain visible contamination it does
not need to be changed. If the oil is becoming black or
contains visible contamination it must be changed. If
the system has been dismantled for service it must be
purged.
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.
Hydraulic hoses
WARNING!
A leaking hydraulic hose can negatively affect steering,
and at worst steering can be lost altogether.
Hydraulic hoses, checks
1 Check carefully that no wear or cracks are present
on the steering system hydraulic hoses.
2 Check external hoses thoroughly as they are
exposed. Damaged hoses must be replaced.
7748934 04-2008