3. Maintenance and troubleshooting
MERMAID E500-S
STD08
Page 26 of 52
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Checking or Replacement of Outlet Valves
(Please refer to pump assemble.)
Unscrew the M10 bolts (pos 48) and remove outlet valve cap (pos 10).
To remove the brass plug (pos 44), insert a M6 bolt into the threaded hole and pull out the plug out
of the pump head (pos 45).
Using a pliers, gently pull the outlet valve assembly (pos 54) out.
Lastly remove the “O” ring (pos 31) at the base of the pump head (pos 45) with a screwdriver, take
extra caution not to scratch the inner wall of the pump head (pos 45).
Check sealing surfaces of the valve body and outlet valve plate. Check outlet valve (pos 54)’s
spring and “O” ring. Replace where necessary. Clean all the parts and replace the worn parts with
the corresponding parts in the repair kit.
Reassemble the in reverse order. The M10 bolt (pos 48) must be tightened in an alternative and
uniform way with a suitable torque wrench to the specified setting (page 30).
44
54
31
45
45
44
