Operating Manual
Item Description
1 Bronze Bush
2 Gasket
3 Socket Set Screw
4 Wave Spring
5 'O' Ring Shaft
6 Seal Housing
7 Shaft
8 Rotorcase
9 Rotary Assembly
10 Rotary Face
11 Stationary Face
12 'O' Ring Housing
The Sewage Seal comprises of an internally
mounted single mechanical seal, bronze bush
and seal housing.
The single mechanical seal has a rotary face
which is sealed to the shaft by an 'O' ring. A
wave spring provides a force to maintain face
to face contact. Rotation is provided by socket
set screws which are tightened onto the shaft.
The stationary face is located in the seal housing
and is prevented from rotating by three pins.
Seal setting is provided by the bronze bush
which locates in the rotorcase with three pins.
Mechanical seal faces are brittle.
Take exteme care when handling.
Disassembly
1. Remove the seal housing plug and loosen
the seal set screws.
2. Remove the seal housing and rotorcase
retaining nuts and carefully pull off the
rotorcase.
3. Take care to remove the bronze bush
from the rotorcase and the seal rotary
assembly from the shaft.
4. All seal parts can now be cleaned,
inspected and replaced as necessary.
Assembly
1. Fit the stationary seal face assembly onto
the seal housing taking care to position it
on the cast lugs provided.
2. Slide the seal housing over the shaft
ends.
3. Carefully place the seal rotary assembly
onto the shaft and up to the stationary
face.
4. Locate the bronze bush into the rotorcase
bore on the three pins provided.
5. Position the rotorcase on the pump and
tighten up the rotorcase/gearcase nuts.
6. Re-position the seal housing onto the
rotorcase and tighten the housing retaining
nuts.
7. Using the hole provided in the seal housing
tighten the mechanical seal set screw to
finally set the seal.
8. Refer to the Maintenance Manual for
refitting the rotors and pump front cover.
9. Finally before start up the seal housing
must be charged with grease and
recharged periodically to ensure
optimum seal performance. The grease
must be pumped into the seal housing
until the grease appears at the shaft bore
of the rotorcase.
Recommended grease for re-charging:
Shell Alvania R2, Burmah Castrol LS2
Mobil Mobilplex 48, Mobil Mobillux NO2
11.6 Mechanical Sewage Seal
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