6-2
Problem
Cause (Reference page)
Action (Reference page)
The bearing is worn or damaged. (5-1)
The grease is deteriorated. (5-1)
Contact Teral or our servicing companies because
disassembly and inspection are required.
Overheat of
bearing
Incorrect installation of the pump and the
piping (3-1)
Check and correctly install them.
The bearing is worn or damaged. (5-1)
The impeller is clogged with foreign matter,
thus leading to imbalanced load.
The main shaft is winding.
Abnormal noise from the shaft seal
(mechanical seal).(5-1)
Contact Teral or our servicing companies because
disassembly and inspection are required.
The motor is running in open-phase
condition.
Check the wiring.
Cavitation has occurred. (3-5)
Consult Teral or our servicing companies.
Incorrect installation of the pump and the
piping, misalignment of the shaft. (3-1)
Check and correctly install or realign them.
Unusual noise
and unusual
vibration of the
pump
Inverter is used.(3-8)
Change the operating frequency or carrier frequency.
An abnormal
amount of water
is leaking from
the shaft seal.
Damage to the mechanical seal. (5-2)
If the leakage becomes large, replace the seal.
Contact Teral or our servicing companies because
disassembly and inspection are required.
When the power
is turned off, the
pump rotates
backward.
The suction pipe leaks the liquid.
Inspect and repair the pipes.
Foot valve is damaged.
Check the foot valve.
The diameter of the suction pipe is larger
than that of pump suction port, and the foot
valve might not open. (3-6)
Change the suction pipe and foot valve with smaller
size. (3-6)
The suction head is too high. (3-1)
Consult Teral or our servicing companies.
Foreign matter is clogged in the suction pipe
or in the strainer.
Check and clean the suction pipe and strainer.
The pump does
not start
self-priming.
The air intrudes from the suction piping.
Check the joint of each suction piping.
