5
Maintenance
Check pressure, output, voltage, current and other specifications. Unusual readings may indicate.
Refer to Troubleshooting and correct as soon as possible.
1. Daily inspections
Check current and ammeter fluctuation daily. If ammeter fluctuation is great, even though within
the limits of pump rating, foreign matter may be clogged the pump. If the volume of liquid dis-
charged falls suddenly, foreign matter may be blocked the suction inlet.
2. Regular inspections
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 prolong the service life of the mechanical seal by replacing the oil in the mechanical seal cham-
ber once a year. Water mixed 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.
Fill suitable amount turbine oil No.32 (ISO VG-32)
Inspections at 3-5year intervals
Conduct an overhaul of the pump. These intervals will help to avoid possible failure in future.
3. Parts need to be replaced
Replace the appropriate part when the following conditions appear.
Note: above replacement schedule is based on normal operating conditions.
Replaceable part Mechanical seal Oil filler plug gasket Lubricating oil O-ring
Condition Oil in mechanical
seal chamber
Inspect or replace
the oil Oil is clouded or dirty Overhaul the pump
Frequency Annual Half a year Half a year Annual
Disassembly and Assembly
1. 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.
(1) Remove pump casing bolts, raise the motor section and remove pump casing.
(2) Remove shaft head bolt and impeller.
(3) Remove oil filler plug and drain lubricating oil.
(4) Remove intermediate casing bolts and oil chamber.
(Remember that any lubricating oil remaining in the mechanical seal chamber will flow out.)
(5)Carefully remove mechanical seal, beware of not to scratch sliding surface of
motor shaft.
2. Assembly-
Re-assemble in reverse order of disassembly.
Be careful of the following points.
(A) During re-assembly, rotate the impeller by hand and check for smooth rotation. If
rotation is not smooth, perform steps-(3) through -(5) again.
(B) Upon completion of re-assembly step -(1) rotate the impeller by hand from the
suction inlet and check that it rotates smoothly without touching the suction
cover before operating the pump.
Please order “O” rings, packing, shaft seals and other parts from your dealer.
