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Simrad Reversible Pump RPU80/160/300
26 20220422N
7.4 The rudder does not stay in off-midship
position, but drifts towards midship due to water
pressure on the rudder
Probable reason (Does not apply for the previous model of
RPU80):
1. The non-return valves are leaking. Shut the stop cocks to the
pump unit, and operate the steering gear by means of the
steering wheel pump. If the steering is normal by hand
operation, the fault must be in the non-return valves or the
slide.
If the slide is locked because of oil contamination, the non-
return valve may be held open.
If the fault is not found on the slide, both of the non-return
valves have to be disassembled. Check the ball seat in the
valve housing for wear etc. Replace the O-ring and copper
gaskets. After having assembled the ball, spring, gasket and
plug, check that the spring pressure on the ball is sufficient
to keep the ball seated. The spring needs a certain pre-
loading to bring the slide back to neutral position.
2. If the problem appears on an RPU80 installation, the reason
may be oil contamination or worn ball seals in the suction
valves. Remove the steel balls for inspection and check the
seals for possible wear. Refer to paragraph 7.10.
3. If the steering gear does not function normally by hand with
the pump unit isolated from the system, there must be a fault
in the steering gear. In order to trace a fault of this nature,
use the instructions given by the manufacturer of the steering
gear.
7.5 Steering wheel is turning while pump unit is
operated
Probable reason:
1. Leaking lock valve in the wheel pump. Check as described
under paragraph 7.4.2.
2. Lock valves are not fitted. Attach lock valve.
7.6 The piston rod of the rudder cylinder does not
move smoothly.
Probable reason:
1. Air in the steering system. Repeat bleeding procedure
described under paragraph 5.1. Look for leakage.
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