Packed stuffing box
The original equipment packing is a suitable grade for the service intended. To pack the standard stuffing
box use the following procedure: For the special (6) ring packing arrangement see Bearing alignmentThe
bearing alignment collar is used to install the radial bearing on the 4MXR, 5MXR, and 6MXR bearing
configurations. It is recommended that you use this tool so as not to damage the radial bearing and or
bearing housing during rotating assembly installation. Appendix 1.
1.
Stuffing box and shaft sleeve must be clean and free of grit.
For a given speed and loading, the bearing housing temperature will stabilize at some tempera-
ture, usually below 93°C | 200°F, which will be the normal temperature for the installation.
2.
Form packing over shaft or mandrel of same diameter. Carefully cut to packing length. Discard
rings cut too short.
3.
Pre-form each ring by coiling 1-1/2 turns.
4.
To install packing rings, do not pull straight. Expand the coil as a coil spring, see Figure:
Packing
rings
, for the correct and incorrect method of installing packing.
Correct
Incorrect
Figure 16: Packing rings
Expand the first coil as shown and insert into stuffing box. Tamp packing to stuffing box shoulder
firmly with the gland. Note, where the cut is positioned.
5.
Install the first lantern ring into the stuffing box. Failure to property locate the lantern ring with the
flush port will result in insufficient packing lubrication.
6.
Install the second and third coil as required by sectional drawing, staggering the cut 90° to 120°.
7.
Install the second lantern ring into stuffing box, carefully noting its proper position on the section-
al drawing.
8.
Install the third and fourth coil as required by sectional drawing, staggering the cut 90° to 120°.
9.
After packing and lantern rings are properly installed, insert gland into stuffing box. Tighten gland
nuts finger tight only. The shaft should turn freely.
10. Turn lubricant supply on, start pump, and adjust the gland as described in Section III-E Stuffing
Box Adjustment.
11. Periodic maintenance is absolutely required for all packed pumps. Normal shaft run-out should
be under 0.13mm | 0.005" to avoid pounding of stuffing box packing. With excessive shaft run-
out, shaft straightening or replacement is necessary.
Gland adjustment
Adjust the stuffing box if packing is used. When the pump is first started, there should be considerable
leakage by the gland to cool the packing. Gradually tighten the gland nuts on flat at a time while observ-
ing the leakage and stuffing box temperature. Packing requires time to "run-in" and extra coolant (leak-
age) while it is being "run-in". If the leakage is reduced too quickly, the packing will overheat and may be
destroyed. The shaft sleeve may also be damaged.
5.1 Preparation for start-up
Model AF (42"/1200mm/54"/60"/66") LM/LMR Bearings Installation, Operation, and Maintenance Manual
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