Simran International, Inc. Heat Pump RPU80 Manuel D’Utilisation

Simrad Reversible Pump RPU80/160/300 

26 

20220422N

 

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. 

Probable reason:  
1.  Leaking lock valve in the wheel pump. Check as described 

2.  Lock valves are not fitted. Attach lock valve. 

Probable reason: 
1.  Air in the steering system. Repeat bleeding procedure 

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