EBARA Submersible Semi-vortex Sewage Pumps
DVSU/DVSHU
Operating, Installation, and Maintenance
Maintenance and Service
1. 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.
2. Regular inspections:
(1) Monthly inspections
Measure the insulation resistance. The value should be more than 1 mega ohm. If resistance starts to fall rapidly even
with an initial indication of over 1 mega ohm, this may be an indication of trouble and repair work is required.
(2) Every 6 months
Check the mechanical seal every six months. If you notice water
mixed with the oil or cloudy texture of the oil, these may be
indications of a defective mechanical seal requiring replacement.
The service life of the mechanical seal can be prolonged by
replacing the oil in the mechanical seal chamber once a year.
When replacing the oil, lay the pump on its side, with filler plug
on top as shown in Fig. 5.
For model DVSU motors, inject turbine oil No. 32 (ISO VG-32) until it overflows. For model DVSHU motors inject rotaly com-
pressor oil A until it overflows. Be certain to dispose of oil residue properly.
(3) Yearly preventive maintenance
Conduct an overhaul of the pump annually. These intervals will reduce the possibility of future trouble.
3. Parts that will need to be replaced:
Replace the appropriate part when the following conditions are apparent.
Above replacement schedule is based on normal operating conditions.
Fig. 5
Table 1
HP
Oil
1/3
4 ozs
1/2
6 ozs
1
6 ozs
2
12 ozs
3
57 ozs
5
57 ozs
Replaceable Part
Mechanical Seal
Oil Filter plug gasket
Lubricating oil
O-ring
Whenever oil in
Whenever oil is
Whenever clouded
Whenever pump
Replacement guide
mechanical seal
replaced or
or dirty
is overhauled
chamber is clouded
inspected
Frequency
Annually
Annually
Annually
Annually
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