Hitachi CHROMASTER 5160 Instruction Manual page 151

5.7 Washing of the Check Valve (suction and discharge side)
Open the purge valve. Use isopropanol as the wash fluid.
Flow the isopropanol for 3 to 5 minutes at a maximum flow rate of
9.999 mL/min, or you may also use the purge function. If this
procedure proves ineffective, take out and wash the valve
following the procedure.
<Required Articles>
Workshop tools (P/N: 810-1353)
Wash fluid (Neutral detergent)
Ultrasonic cleaner
Beaker
Make sure the pump head lock nuts are securely tightened.
(1) Remove the inlet tube and the outlet pipe (1) from the check
valve (suction and discharge side).
Check valve
(Discharge side)
Check valve
(Suction side)
(2) Loosen the check valve (suction and discharge side).
Remove them along with the valve holder using the M10
wrench.
Check valve
(Discharge side)
Check valve
(Suction side)
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Outlet pipe (1)