Hitachi CHROMASTER 5160 Instruction Manual page 154

5.8 Parts Replacement for the Check Valve (suction and discharge side)
After long use, the packings in the discharge valve and the
suction valve may be damaged and cause leaks. If the leaks
persist after retightening with a wrench, you must replace the
packing.
<Required Articles>
Workshop tools (P/N: 810-1353)
Seal (A) (P/N: 810-1345 x 2)
Filter (B) (P/N: 891-1364)
Wash fluid (Distilled water)
High quality paper
Several filter papers
Beaker
Ultrasonic cleaner
Make sure the pump head lock nuts are securely tightened.
<Remove the check valve>
(1) Remove the check valve (suction and discharge side)
referring to (1) and (2) in 5.7.
(2) Place a rather large piece of paper on a table. Remove the
packing (B) (refer to (3)). Position the valve holder slightly
aslant. Gently tap the valve holder against the table, and
take out the check valves and packings from the inside.
High quality paper of a large size (A3 or larger).
(3) Fill the beakers with the wash fluid (distilled water).
Combine the new packings, valve chests, valve balls as sets.
Place them separately in each of the beakers. Place the
valve holders in separate beakers also.
NOTE: The ball and seat of the check valve are combined as a
set. Be careful not to mistake the combination when
disassembling and washing them.
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Valve holder