If the pump has a mechanical seal that is a John Crane Type 8, then set the seal to the dimension shown
in the following figure and then tighten the setscrews.
Figure 36: Mechanical seal (John Crane Type 8) setting
6.7.5 Install the gaskets
1.
Clean the gasket surfaces of the casing.
2.
Apply Scotch 3M-77 spray adhesive or equivalent to the lower half of the casing.
3.
Within one minute of spraying, do the following:
a) Set the gaskets (351D and 351S) in place on the lower half of the casing.
b) Align the holes in the gaskets with the holes in the casing.
c)
Press the gaskets firmly against the face the lower half of the casing in the area coated by the
adhesive.
6.7.6 Assemble the casing
Check the rotation of the pump before installing the upper half of the casing. For the correct rotation, see
the figure in
6.5.2 Change the rotation on page 44
.
1.
Lower the upper half of the casing (100) into place and locate with the taper dowels (469G).
Upper half casing
2.
Install the casing joint bolts (426 and 426A) and tighten to the following torque values:
Screw type
Torque
0.75 in.-10 Ferry Cap Countr-bor screws (Grade 8)
300 ft-lb ( Nm) minimum
1.0 in.-8 Ferry Cap Countr-bor screws (Grade 8)
400 ft-lb ( Nm) minimum
The number of casing bolts varies with the size of the pump. See
6.7.2.1 Dimension A on page 50
NOTICE:
Avoid leakage at the main joint. Tighten bolts to the proper values in the proper sequence to
obtain the proper gasket compression.
6.7 Reassembly
52
Model 3409 Installation, Operation, and Maintenance Manual
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