Simran RPU80 instruction manual Rudder moves only in one direction with pump running

Simrad Reversible Pump RPU80/160/300

7.10Rudder 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.

28 20220422N

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