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The Practical Pumping Handbook - . ...........................................

12.9 Assembling the back pull-out assembly

Install the flame adapter to the bearing housing with the gasket.
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2. Tighten bolts in accordance with the torque specifications of the
manufacturer in a criss-cross pattern.
Check adapter fits and ensure the total indicator reading is no
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greater than 0.005 inches by rotating the shaft through 360 ~
Install the bearing isolator into the adapter and ensure that the
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drain slot is located at the bottom (or 6 o'clock) position.
12.9.1 A packed stuffing box
Install the back cover with the stuffing box
o
2. Check the back cover run-out by rotating the indicator through
360 ~ . The total indicator reading should be within 0.005 inches.
Install the shaft sleeve until it is fully seated, with anti-galling
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compound to facilitate the next disassembly.

12.9.1.1 Installing the impeller with a packed stuffing box
1. Using heavy work gloves to protect against the sharp edges of the
impeller, install the impeller with the 'O' ring seal until the
impeller makes firm contact with the shaft.
Tighten the impeller onto the shaft in accordance with the pump
.
manufacturer's instructions.
Loosen the bolts and jacking screws on the bearing cap.
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4. With feeler gauges, measure the gap between the rear of the
impeller and the face of the back cover.

Loosen off the bolts and jacking screws on the bearing cap until a
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clearance behind the impeller of 0.030 inches is achieved.
In most ANSI pump designs, and in an as-new condition, this
approximates a front clearance of 0.015 inches from casing. This
final clearance must be established when the pump is fully
assembled, just prior to locking the mechanical seal down onto
the shaft.

Tighten the bearing cap bolts and the locking nuts on the jacldng
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screws.
Check the impeller run-out, vane tip to vane tip. The run-out
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should not exceed 0.005 inches.