Hitachi CHROMASTER 5160 Instruction Manual page 143

(4) Carefully pull out the plunger wash mechanism toward you.
NOTE: Do not remove the seal in the plunger wash mechanism
guide.
(5) Take out the pump seal. When the pump seal remains in
the pump head, pull out the pump seal by screwing the
exclusive seal-removing rod into it.
When the pump seal remains in the plunger, start the pump
and as soon as the plunger has come out, stop the pump
and pull out the pump seal.
Wipe the surface of the plunger with gauze or any other soft
cloth.
(6) Wash the pump head. Wash the pump head thoroughly
with distilled water or organic solvent. Depending on the
circumstances, use a neutral detergent and/or ultrasonic
cleaner.
Cleaning bottle
Guide
Pump head
Seal removing rod
Pump head
Tray
5 - 6
Beaker
Pump head
Ultrasonic cleaner