05
Operation & Maintenance
Before Starting the Pump
1) After completing installation,
measure the insulation resistance
again as described in Installation.
2) Check water level. If the pump is
operated continuously for an
extended period of time in a dry
condition or at the lowest water
level, the motor protector will be
activated. Constant repetition of
this action will shorten pump
service life. Do not start the pump
again in such a situation until
after the motor has completely
cooled.
Test operation
Automatic (2AHS-A) and non-
automatic (2AHS) pump:
1) Turn the operating switch on and
off a couple of times to check for
normal pump start.
For the 2AHS-A:
Floating switch must be raised for
the pump to start.
2) Next, check direction and rotation.
If discharge volume is low or
unusual sounds are heard when
the pump is operating, rotation
has been reversed. When this
happens, reverse two of the wires.
Daily inspections
:
1) Check current and ammeter
fluctuation daily. If ammeter
fluctuation is great, even though
within the limits of pump rating,
foreign matter may be clogging
the pump. If the quantity of liquid
discharged falls suddenly, foreign
matter may be blocking the
suction inlet.
Maintenance
Check pressure, output,
voltage, current and other
specifications.
Unusual
readings may indicate. Refer to
Troubleshooting and correct as
soon as possible.
Monthly inspections
:
Measure the insulation resistance.
The value should be more than 1M
ohm. If resistance starts to fall rapidly
even with an initial indication of over
1M ohm, this may be an indication of
trouble and repair work is required.
Annual inspections
:
To extend the service life of the
mechanical seal, replace the oil in the
mechanical seal chamber once a
year. Water mixed with the oil or
cloudy textures are indications of a
defective mechanical seal requiring
replacement. When replacing the oil,
lay the pump on its side with filler
plug on top. Inject suitable amount
turbine oil no. 32 (ISO VG-32).
Inspections at 3-5 year intervals
:
Conduct an overhaul of the pump.
These intervals will preclude the
possibility of future trouble.
Parts that will need to be replaced
:
Replace the appropriate part when
the
following
conditions
are
apparent. See figure 4. (Note:
replacement schedule is based on
normal operating conditions)
REPLACEABLE
PART
Mechanical seal
Oil filler plug
gasket
Lubricating oil
O-ring
REPLACEAMENT
GUIDE
Whenever oil in
mechanical seal
chamber is
clouded
Whenever oil is
replaced or
inspected
Whenever
clouded or dirty
Whenever pump
is overhauled
FREQUENCY
Annually
Every 6 months Every 6 months
Annually
Figure 4
Disassembly
When disassembling pump, have a
piece of cardboard or wooden board
ready to place the different parts on
as you work. Do not pile parts on top
of each other. They should be laid out
neatly in rows. The o-ring and gasket
cannot be used again once they are
removed. Have replacement parts
ready. Disassemble in the following
order, referring to the sectional view.
Be sure to cut off power
source before disassembly.
WARNING
1. Remove pump casing bolts, raise
the motor section and remove pump
casing.
2. Remove shaft head bolt and
impeller.
4. Remove intermediate casing bolts
and intermediate oil chamber.
(Remember that any lubricating oil
remaining in the mechanical seal
chamber will flow out.)
3. Remove oil filler plug and drain
lubricating oil.
5. Carefully remove mechanical seal,
taking care not to scratch sliding
surface or motor shaft.
Assembly
Re-assemble in reverse order of
disassembly. Be careful of the
following points:
6. During re-assembly, rotate the
impeller by hand and check for
smooth rotation. If rotation is not
smooth, perform steps (3) through
(5) again.
7. Upon completion of re-assembly
step 1 rotate the impeller by hand
from the suction the suction inlet
and check that it rotates smoothly
without touching the suction cover
before operating the pump.
Please obtain o-rings, packing, shaft
seals and other parts from pump
dealer.
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