Mechanical Seal Replacement Procedures; Disassembly - EBARA 25EVMS85.37 Instruction Manual

Mechanical Seal
10
Replacement Procedures
The mechanical seals in the pump you have purchased are of the cartridge type. They can be replaced
without pump disassembly.
Warning
Caution

1. Disassembly

For disassembly, refer to the construction in
(1) Turn the power OFF.
(2) Remove the cover on the motor terminal box, and remove the external wiring.
Note
(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
(5) Remove the hexagon socket head bolts (total of 4, 120-6) holding the coupling (140), and
remove the coupling.
Note
(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
(9) Remove the hexagon socket head bolts (a total of 4 bolts, 120-3) securing the mechanism
cover (111-3).
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.
Never disassemble
necessary, contact EBARA.
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).
Do not completely remove the hexagon socket set screws (130-1). The
cartridge mechanical seal (111) will be disassembled.
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.
The motor (800) should be removed using a hoist or other safe measures.
the motor. When disassembly
. and follow the procedure below.
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is
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