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•
Fit the soft washer (92a) in place on the
support ring.
•
Fit the O-ring (93) to the rotary seal seat (92).
Gently push the seal seat squarely on to the
shaft, aligning the hole in the rear of the seal
face with the pin on the support ring.
•
Clean the seal faces with a soft lint-free tissue
to remove any grease or dust - do not
lubricate. Refit the rotor case taking care that
the shafts do not damage secondary seal
faces.
(6.7 ROTOR CASE)
6.6 SEAL HOUSINGS
It is not normally necessary to remove the seal
housings (86, 89 or 95) from the back of the
rotor case except to check the condition of the
springs (82) and drive plates (81).
If required to do so, proceed as follows:
Note: Seal housings vary for single (86) flushed
(89) & double seals (95) (see 3.11 SEALS AND
FLUSHING).
Removal:
•
Remove the end cover (see 6.1 END COVER),
rotors (see 6.2 ROTORS), rotor case (6.7
ROTOR CASE).
•
Position the rotor case (51) face down on the
clean smooth surface, seal housings (86, 89
or 95) uppermost. Taking care not to damage
the front of the rotor case.
•
If double seals are fitted remove the static
seal seats (92) from the housings (95),
keeping mating seal faces together. You may
wish
to
label
SECONDARY MECHANICAL SEALS – DOUBLE).
•
Loosen the screws (85) by half a turn and
rotate eccentric clamp plate (84) by half turn.
•
Carefully withdraw the seal housings. Note
the position of the drive plates, wave springs
and backing rings.
•
Inspect the components for wear, replace as
required.
Re-Fitting:
For single flushed seal housings refer to (6.4
MECHANICAL SHAFT SEALS - SINGLE FLUSHED)
for lip seal replacement.
•
Primary or Single Flushed Seal - Assemble
the wave spring (82) followed by the drive
the
components.
(6.5
plate (81). Ensure that the 3 slots on the
outer edge of the drive plate locate on the 3
pins in the housing. Drive plate should be
assembled with drive tabs side last.
•
Secondary Mechanical Seal -Assemble one
drive plate (94) with drive tabs side entering
first and the 3 slots on the outer edge locating
on the 3 pins in the housing. Assemble the
wave spring (82) followed by the second drive
plate (81).
•
Ensure that the 3 slots on the outer edge of
the drive plate locate on the 3 pins in the
housing. The drive plate should be assembled
with drive tabs side last i.e. opposing direction
to first drive plate.
•
For flushed or double seals, position O-ring
(91) on to the step on the outside diameter of
the seal housing.
•
Holding the seal housing (86), drive plate(s)
(81 & 94) and wave spring (82), together;
position the housing assembly into the bore
on the backside of the rotor case. Fit it flat
with the rear face of the rotor case.
•
Hold in position and rotate the clamp plates
(84) half a turn in order to retain the housing.
Tighten the screws (85) finger tight only.
•
Ensure the drive plate(s) is free to move.
•
Tighten the housing screws to a torque of
15Nm.
6.7 ROTOR CASE
•
Disconnect
the
process
flush/barrier connections; first ensuring fluid
is not under pressure.
•
The rotor case can be removed after
withdrawing the end cover (see 6.1 END
COVER), the rotors (see, 6.2 ROTORS)
•
Remove four hexagon socket screws (52)
holding the rotor case (51) to the bearing
carrier (1).
Note that the rotor case is dowelled and can
only be re-fitted one way round.
ATTENTION
Secure the pump onto a workbench or baseplate
before removing the rotor case, as the gearbox
will tip backwards without the rotor case being in
position.
ATTENTION
The rotor case is heavy; ensure that it is
supported before the four hexagon socket screws
pipes
and
any
29
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