19
PUMP
Condition
Cause/Remedy
Water suction becomes impossible when difference in height between pump and suction level
exceeds 9 m. Place the pump so as to minimize the difference.
Confirm that there is no clogging in the water suction pipe strainer, rattan basket, water suction pipe
inside and water suction port strainer. If clogged, remove foreign materials.
Compound
pressure
Gauge
indicates
Negative
pressure.
Water suction may be impossible if there is an air pocket in the water suction pipe. Confirm that the
water suction pipe is arranged regularly.
Confirm that the water discharge valve and muffler drain cock are closed. If not, close.
Confirm that the vacuum pump strainer cap is regularly closed and that the strainer is not clogged.
If clogged, clean and tighten the cap securely.
Confirm that the V-belt is extended or broken.
Refer to P. 14 "MAINTENANCE, Adjustment and Replacement of Vacuum Pump Driving V-belt".
Confirm that the water suction pipe is regularly tightened, and that the water suction portion is regularly
placed in water.
If not, tighten the water suction pipe regularly, and immerse the water suction part completely in
water.
《
Possibility of leakage in the pump sealing and piping.
》
Impossibility of water suction
Compound pressure gauge does not
indicate
negative
pressure.
《
Possibility of failure in the vacuum pump.
》
If the nozzle diameter is too large, water discharge pressure cannot reach a specified level. Check
the specification of the nozzle. Replace it with a new one, if necessary.
Pump
Confirm that the water suction pipe strainer, rattan basket, water suction pipe inside, and water suction
port strainer are not clogged.
--- Refer to "Impossibility of water suction".
Insuf
ficient water
discharge pressure
Engine
Confirm that the engine operates regularly.
--- Refer to "Irregular rotation".
Confirm that there are foreign materials in the labyrinth. If there are, remove them.
Pump
Confirm that the pump does not freeze.
--- Refer to "Cautions in Cold Weather".
Impossibility of
pump
rot
a
tion
Engine
《
Possibility of Engine Seizure
》
