Hitachi CHROMASTER 5160 Instruction Manual page 158

(4) Remove the wash mechanism seal in the wash mechanism
plunger guide.
Remove the plunger wash mechanism guide from the
plunger while rotating it to the left and right gently.
(5) Loosen a seal holder with the flathead screwdriver while
holding the bearing of the wash mechanism plunger guide
with wrench17, and then remove it.
(6) Remove the wash mechanism seal placed between the
bearing and the seal holder.
When the wash mechanism seal remains, pull out it by
screwing the exclusive seal-removing rod into it.
(7) 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
(8) Wipe the surface of the plunger with gauze or any other soft
cloth.
Seal holder
Pump head
Tray
Plunger
5 - 21
Flathead screwdriver
Beaker
Pump head
Ultrasonic cleaner