51
M
aint
ena
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Before replacement
First release pressure from the pump head and discharge line.
Stop the pump operation.
Rotate the adjusting screw two revolutions anticlockwies or open an air vent line to re-
lease pressure.
NOTE
Do not rotate the screw three revolutions from the closed position. The adjusting screw may come off
with solution spray.
Check the air vent line and the pump head are depressurized.
Liquid pressure is released from the air vent line in the form of solution spray.
NOTE
If pressurized liquid is not expelled, run the pump with an opened air vent line until pressure is re-
moved.
Valve set replacement
■ Discharge valve set disassembly/assembly
Necessary tools
• An adjustable wrench or spanner
• A 21mm box wrench
• A pair of tweezers
*Unfix the pump base before disassembly.
Loosen the fitting nut and remove the discharge tube
and air bleed tube.
Turn the lock nut anticlockwise by an adjustable wrench
and remove the air vent body A.
2
1
3
Wear part replacement
2
1
Lock nut
Air vent
body A
Fitting nut
Air bleed tube
Discharge tube
Summary of Contents for EHN-B11-NAE
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