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Simrad Reversible Pump RPU80/160/300
28 20220422N
7.10 Rudder moves only in one direction (with
pump running)
Probable reason:
Suction valve not working (pos. 20, 9, 21) on one side. This is
most probably caused by metal fragments that have entered into
the suction valve(s) through the tube fitting for the return line
(C) during installation. Ref. figure 3-1.
The suction valve (3) on the side that is not giving pressure must
be opened and thoroughly cleaned, and for safety reasons the
other valve should also be inspected and cleaned before
reinstalling the pump unit.
For disassembling and cleaning of the suction valves please use
following procedure (Ref. figure 9-1):
1. Unscrew the grub screw - pos. 21.
2. Remove the spring - pos. 9, and the steel ball - pos. 20.
3. Thoroughly clean the valve seat and the threads in the valve
block (1). Also clean the removed steel ball (20), spring (9)
and grub screw (21). Use Loctite "Super Clean" or similar.
Reassemble as follows:
1. Put the steel ball (20) into the valve block.
2. Put the spring (9) onto the grub screw (21) before it is
screwed into the valve block.
Note ! Use Loctite 542 or similar on the threads to prevent oil leakage.
If Loctite 747 "Activator" is sprayed on the threads before
applying Loctite 542, this will speed up the hardening
process.(With Loctite 542 only, you have to wait 4 hours before
the pump unit can be put in operation again. Using Loctite
"Activator" reduces the hardening time to 1 hour).
3. Make sure the grub screw (21) is screwed in until it is flush
with the valve block (1). This will ensure correct spring
tension in the suction valve.
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