EVMS/EVMSL
- 23 -
EBARA
CORPORATION
10
Mechanical Seal
Replacement Procedures
The mechanical seals in the pump you have purchased are of the cartridge type. They can be replaced
without pump disassembly.
Warning
For disassembly and inspections, close the suction and
discharge valves, drain the casing drain valve, and ensure
that the pump pressure is not abnormal or negative. The
pump may undergo abnormal rotation while the work is
incomplete, resulting in damage to the casing.
Make sure to turn the power OFF during pump disassembly or
assembly. There is a danger of the pump starting suddenly
through automatic operation, etc.
Caution
Never disassemble the motor. When disassembly is
necessary, contact EBARA.
1. Disassembly
For disassembly, refer to the construction in
9
. and follow the procedure below.
(1) Turn the power OFF.
(2) Remove the cover on the motor terminal box, and remove the external wiring.
Note
Drain the liquid completely in the discharge pipe, suction pipe and the pump
interior. To drain the liquid in the pump, remove the drain plug (212-1) for
the lower casing (6).
(3) Remove the cross-recessed head machine screws (a total of 4 on both sides, 130-2) holding
the coupling guard (245), and remove the coupling guard.
(4) Loosen the hexagon socket set screws (total of 3 on both sides, 130-1) located on the side of
the sleeve retainer (111-4) of the cartridge mechanical seal (111).
Note
Do not completely remove the hexagon socket set screws (130-1). The
cartridge mechanical seal (111) will be disassembled.
(5) Remove the hexagon socket head bolts (total of 4, 120-6) holding the coupling (140), and
remove the coupling.
Note
To ease removal, insert a slotted screwdriver in the gap between the
couplings (140). When a single coupling has been removed, lift the shaft
(31) slightly using the pin (131-1), and then remove the remaining coupling.
(6) Remove the pin (131-1) from the shaft (31).
(7) Remove the hexagon bolt (120-13) securing the motor (800) and partially separate the motor
and the motor bracket. (4.0 kW or less types only)
(8) Remove the motor (800) from the pump. (4.0 kW or less models only)
Note
The motor (800) should be removed using a hoist or other safe measures.
(9) Remove the hexagon socket head bolts (a total of 4 bolts, 120-3) securing the mechanism
cover (111-3).