6-2
Problem
Cause (Reference page)
Measures (Reference page)
Operator *
The rotating speed is low.
Check with the tachometer.
User
The sluice valve is closed.
Open the sluice valve.
User
The piping is clogged up with foreign matter.
Check and clean the piping.
User
The strainer in the suction port is clogged.
Check and clean the strainer.
User
The pump starts,
but cannot achieve
the specified
discharge rate and
the specified head.
The suction port is exposed above the liquid
level. (3-2)
Adjust the liquid level.
User
The bearing is worn and damaged. (5-1)
Vendor
The grease is deteriorated. (5-1)
Replace the bearing. (5-1)
Contact the vendor because
disassembly and inspection are
required.
Vendor
Overheat of bearing
Incorrect installation of the pump and the piping
(3-2)
Check, and correctly install.
User
The bearing is worn and damaged. (5-1)
Replace the bearing. (5-1)
Contact the vendor because
disassembly and inspection are
required.
Vendor
The motor is in open-phase operation. Check
the
wiring.
User
The impeller is clogged with foreign matter,
resulting in an imbalance.
Disassemble and check.
Contact the vendor because
disassembly and inspection are
required.
Vendor
Cavitation has occurred.
Contact the manufacturer and
vendor.
User
Incorrect installation of the pump and the piping
(3-2)
Check, and correctly install.
User
Unusual noise and
unusual vibration of
the pump
Abnormal noise from the shaft seal (mechanical
seal) (3-2)
Disassemble and check.
Contact the vendor because
disassembly and inspection are
required.
Vendor
An abnormal
amount of water is
leaking from the
shaft seal.
Damage to the mechanical seal (5-1)
If the water leakage becomes large, it
is necessary to replace the seal.
Contact the vendor because
disassembly and inspection are
required.
Vendor
Water hammer
occurs.
Hammering has occurred when the valve is
opened and closed rapidly.
Provide a pressure damper (e.g.
accumulator).
User
* t is specified for reference because the range where the measure can be taken varies depending on the
user.
Even for the above problems for which “User” is specified as the Operator, ask the vendor or contact
Teral Inc. if you have any questions.
