Tsurumi PU Submersible Vortex Sewage Pump - Manual (Page 16)

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Regular maintenance and inspection are indispensable to maintaining the pump's per-
formance. If the pump behaves differently from its normal operating condition, refer to
section "9. Troubleshooting" and take appropriate measures at an early stage. We also
recommend that you have a spare pump on hand for an emergency.
Prior to Inspection
WARNING Make sure that the power supply (i.e. circuit breaker) is disconnected and
disconnect the cabtyre cable from the power outlet or remove it from the
terminal board. Failure to do so may cause electrical shock or unintended
starting of the pump, which may lead to serious accidents.
(2) Inspecting the Pump Exterior
Verify that there is no damage, and that the bolts and nuts have not loosened.
Note:
If the pump must be disassembled for repair due to damage or loose bolts or nuts, contact
the dealer where it was purchased, or the Tsurumi sales office in your area.
(1) Washing the Pump
Remove any debris attached to the pump's outer surface,
and wash the pump with tap water. Pay particular atten-
tion to the impeller area, and completely remove any de-
bris from the impeller. To remove the strainer, use a flat-
tip screwdriver to pry on the three areas of the strainer
as illustrated on the right (PN, PSF, and TM models). To
reinstall, simply install the strainer in place.
flat-tip screwdriver
Note:
It takes approximately 1 second for the pump to start after the float is moved. Allow the
pump to operate a minimum of 2 seconds for each trial operation. The trial operation must
be completed within 1 minute.
CAUTION In case the pump exhibits an abnormal condition (such as a considerable
amount of vibration, noise, or smell), disconnect the power supply
immediately and contact the dealer where you purchased the equipment, or
Tsurumi's sales office in your area. If the pump continues to be used in the
abnormal state, it may cause current leakage, electrical shock, or fire.
(5) Again, direct all the floats downward.
(6) Raise the (red) stop float, then the (green) parallel operation float. This will cause the
pump to start.
(7) Next, return the (green) parallel operation float, and then the (red) stop float to their
original positions. This will cause the pump to stop.
(8) Perform steps (6) and (7) consecutively two or more times to verify the operation.
6-3 Automatic Alternating Operation
The (PUW, PNW, or PSFW) automatic alternating type pump is used in conjunction with
the (PUA , PNA, or PSFA) automatic type. Equipped with floats to detect the water level and
an internal control circuit, it can perform an automatic alternating drainage operation by
merely connecting its cable to a power supply.
Connect the power and perform a trial operation as follows:
Check float switch operation
Move
Float Switch
(1) Direct all the floats downward.
(2) First raise the (red) stop float, then the (yellow) alternating
start float.
(3) Next, return the (yellow) start float, and then the (red)
stop float to their original positions. This will cause the
pump to stop.
(4) Perform steps (2) and (3) consecutively three or more
times to verify the operation. The pump will start and
stop every other time.
Trial Operation
7 MAINTENANCE AND INSPECTION