Tsurumi PU Submersible Vortex Sewage Pump - Manual (Page 18)

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This section explains the disassembly and reassembly processes that are involved up
to the replacement of the impeller itself. Operations involving the disassembly and
reassembly of the sealing portion (i.e. mechanical seal) and of the motor require a
specialized facility including vacuum and electrical test equipment. For these opera-
tions, contact the dealer where this equipment was purchased, or the Tsurumi sales
office in your area.
Disassembly Procedure
Prior to Disassembly and Reassembly
WARNING Before disassembling and reassembling the pump, be sure that the
power supply (i.e. circuit breaker) is disconnected, and remove the
cabtyre cable from the outlet or the terminal board. Do not connect
or disconnect the power plug with a wet hand, in order to prevent
electrical shock. Do not perform an activation test (to check the
rotation of the impeller) during disassembly and reassembly. Failure
to observe this precaution could lead to a serious accident, including
injury.
PU Series
Note:
Before disassembling, be sure to drain the oil from the pump.
(1) This pump has adopted a back-pullout construction. Therefore, by removing the four
cross-recessed hex bolts ⑨ (or hex nuts on the 1.5kW model), the pump can be inspect-
ed while the impeller ④ remains attached to the motor mainshaft.
(2) Remove the two cross-recessed hex bolts ⑥, and remove the screwed flange ⑦, packing ⑧,
and two hex nuts ⑩ , in that order.
(3) Remove the truss screw ③ , and remove the impeller ④ and the spring washer ⑤ , in that
order.
(4) Wash and inspect all parts to make sure that they are not worn or damaged.
Note:
If any part is worn or damaged, make sure to replace it with a new part. Replace the pack-
ing and the O-ring each time the pump is disassembled.
8 DISASSEMBLY AND REASSEMBLY PROCEDURE
Oil Inspection and Changing Procedures
Inspecting Oil
Remove the oil plug and take out a small amount
of oil. The oil can be extracted easily by tilting the
pump so that the oil filler plug faces downward. If
the oil appears milky or intermixed with water, a
likely cause is a defective shaft sealing device (i.e.
mechanical seal), which requires that the pump
be disassembled and repaired.
Changing Oil
Remove the oil plug and drain the oil completely.
Pour a specified volume of oil into the oil filler
inlet.
Note:
The drained oil must be disposed of properly to prevent it from being released into the
sewer or rivers. The packing or the O-ring for the oil plug must be replaced with a new part
at each oil inspection and change.
Phillips Screwdriver
Oil Plug
Oil Inlet
Packing
Model with 0.25 ~ 0.75kW power output
Model with 0.15kW power output
240
150
Applicable Model Specified
Volume
Unit :
Model with 1.5kW power output 500
Specified Oil:
Liquid Paraffin VG32