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5.2.8 Checking Coupling and Spider
The spider of the coupling that connects the Pump body and the motor is made of rubber.
Replace it if the spider is damaged. Please contact the closest Service center.
Replace it once a year by rule of thumb. If the Pump is started and stopped several hundreds
of times a day, however, shorten the replacement frequency.
To replace the coupling spider, proceed as follows. (Refer to Fig. 19).
(1) Stop the Pump and turn OFF the Power Supply. Disconnect the power cable of the motor.
(2) Use a Phillips screw driver to remove the pen head screw with cross recess x 8 fixing the
Panel.
(3) Use a wrench to remove the M8 nut x 4 and spring washer x 4 fixing the Pump unit.
(4) Remove the Pump unit from the medium case.
(5) Now you can check the spider of the coupling. Replace the spider with a new one.
(6) Put the new coupling spider in one of the coupling. Meet the ratchet of both couplings and
mount the Pump unit in the medium case.
(7) Put the M8 nut x 4 and spring washer x 4 removed in the item (3) above (Recommended
tightening torque: 25 N・m).
(8) Put the pen head screw with cross recess x 8 removed in the item (2) above.
(9) Execute the wiring.
Fig. 19 Replacement of coupling spider
WARNING
① When removing and installing the Pump main body for replacement
of the coupling spider and for overhaul, lift and support the Pump
main body by a crane, etc. to ensure the work safety.
Example: Wrap nylon sling around the Pump main body so that it does not fall
down, and lift and support it by a crane.
Example: Install 2 pieces of M8 eyebolts to the exhaust port, and lift and support by
a crane, etc.
② Be sure to turn OFF the Power Supply when putting on and taking
out the Motor.
③ Only the technically entitled person should be in charge of operating
the machine such as crane.
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