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4. Consumable parts change: Please replace the following parts as set.
(1) Front casing set
Front Liner ring + Separating board + Grating board
+ Lap joint + Priming water plug + Drain plug + O-ring + Packing
(2) Rear casing set
Rear Rear thrust ring + Shaft
(3) Impeller set
Im Mouth ring + Bearing
(4) O-ring for casing
Disassembly / Assembly
YD-250* / 400* / 500*GV(F)* series
The magnet force which is used in a pump is powerful, be careful of it during disassembly or
assembly. As well make sure to close the suction and discharge valves during them.
1. Disassembly
(1) Drain the liquid remaining inside the pump and wash the interior thoroughly.
(2) Remove hex. nuts (3 or 5 pcs) in the front and 3 hex socket head cap screws and remove the
front casing from the rear casing support. (Do not disassemble the front casing set to maintain
the proper function.)
(3) Pull the impeller out to forward. Do not scratch them with care.
(4) When putting sharps such as scraper between the rear casing and rear motor bracket and lifting
the rear casing, the rear casing is pull out to forward.
(5) When removing the flange from the casing, use a plastic hammer. Hit lightly and remove it from
the lap joint.
2. Assembly
Assembly is in the reverse order of disassembly. Clean the sliding parts and O-rings thoroughly with
no entering dust or scratch. As well tighten the bolts evenly.
(1) Assemble the outer magnet with the motor. At that time, adjust that the height of the bracket and
outer magnet is 13 mm. (If it is the dedicated motor, it is completed to push the shaft to the end.)
(2) Attach the rear casing support with bracket.
(3) Place the rear casing and insert the impeller to the shaft with care not to get a hand.
(4) Install the O-ring to the rear casing and assemble with the front casing.
(5) After tightening all bolts, pipe it and pour priming water from the priming water plug.
The recommended tightening torque is as follows.
Model
Torque
250*GV*
7.0N
・
m
250-GVF3
6.5N
・
m
400*GV3, 500*GV3
10.0N
・
m
400*GVF3, 500*GVF3
7.0N
・
m
Note:
(1) The magnet force is strong and use the plastic or wood spacer no to get finger.
(2) When re-assembly, it is recommended to replace new O-rings.
If using the old O-rings, it may cause liquid leakage.
(3) After assembly, remove the motor fan cover and rotate it by a hand. Check it rotates smoothly.
<Rotation direction check of the motor>
Check that the direction is clockwise as viewed from the motor fan cover at the start. If it is in reverse,
switch two of the three phases in the three-phase power supply.
