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Inspection and maintenance plan
Time interval
Description
As needed
Clean the check valve and the prefilter.
Failure removal
Failures
Causes
Engine does not start
No power supply.
Blocked pump wheel
Pump does not suck
Missing, loose or blocked check valve
Check valve is not in water.
No water in the pump shell.
Too high suction head.
Air bubbles in the suction pipeline.
Connections not sealed, pump sucks air,
pump is not deaerated.
Prefilter clogged
Thermal detector swit-
Pump is overheated and switched off by
ching the pump off
the thermal overloading protection.
No electric power supply.
Impurity particles (e.g. pebbles) have
settled down in the suction hole.
Insufficient amount of
Too high suction head.
water pumped
Strainer of the check valve dirty
Water level quickly drops down
Reduced switching
Air pressure in the receiver too low
intervals
Any other details
Check the check valve function.
Removal
Turn the engine shaft with screwdri-
ver through the fan cover (to release
friction circles sealing that may be stuck
together).
Fix or clean the check valve.
Immerse the check valve into water.
Fill the pump shell with water.
Check the suction head.
Check the tighten of suction pipeline.
Clean the prefilter.
Let the device getting cool!
Check power supply.
Disassemble and clean the suction
hose, prevent from suction of foreign
substances.
Check the suction head.
Clean the strainer., Position the check valve
lower.
Clean the prefilter.
Clean the pump and replace worn parts.
(qualified workshop)
Control air pressure.
ENGLISH
17
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