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MAINTENANCE
John Crane Double 8 Seal
1.
Install front gasket (11), stationary seal (12), rear gasket (11) and seal gland (10) into
casing (1) using Allen screws (9) and washers (38). NOTE: A rear elastomer gasket is
required when using a front PTFE gasket.
2.
Install o-ring (27), rear stationary seal (26) and o-ring (20) into stuffing box (47).
3.
Install John Crane Double 8 Seal (48) onto casing stationary seal.
4.
Install two screws (23) to secure stuffing box to casing.
12
11
10
9
1
20
26
27
47
38
48
11
14. Install o-ring (5) in impeller.
15. Install impeller screw (4) on stub shaft. Torque impeller screw to 180 lb-in or 15 lb-ft (21
Nm). For the CL4311 and CL6410, torque the impeller screw to 30 lb-ft (41 Nm).
16. Install flushing pipes (24) to stuffing box.
At this point, you may want to run water through the flushing pipes at normal pressure to
ensure that the seals don't leak. Leakage may indicate damage to the stationary seal or
incorrect rotating seal installation.
