Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 11)

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When ordering replacement impellers and deflectors, refer to
the Notes on accompanying illustration.
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1. Remove End Head Bolts (5) and End Head (6).
2. Mark the motor shaft and impeller (8) hub with an arbitrary
12 oʼclock reference point. Remove the first stage impeller
(8A) and mark it for reference during reassembly.
3. Check axial position of each deflector (7) at four radial
points with reference to end of housing and record for refer-
ence when reassembling unit.
4. Remove spacer (14A) holding rope packing (4) in place.
Mark spacer for reference during reassembly.
5. Remove rope packing (4) holding deflector in place. Remove
deflector (7A). Mark for reference during reassembly.
6. Proceed to remove remaining stages in the same way,
marking each component to insure proper reassembly.
Note: Division Head (3) cannot be removed.
7. Unbolt division head packing plate (2A) and slide packing
plate and packing (2) back on the shaft.
8. Remove motor mounting bolts and slide motor (1) back.
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1. Place the division head packing plate (2A) and packing (2)
on the shaft. If for any reason the packing (2) is damaged,
replace it. Install the motor (1) in the housing in its original
position. Be sure that the shaft is centered in the housing.
Assemble the packing (2) and packing plate (2A) to the
division head.
2. Run the motor (1) to check for vibration. If excessive vibration
is present, check the shaft for runout.
3. Place the first impeller (8C) on the shaft up against the division
head (3). Mark the shaft approximately 1/8" out and with-
draw the impeller to this point. This will insure a clearance
of 1/8" behind the impeller. Tighten the hub securely.
4. Inspect the interstage packing (9), if applicable, on deflector
(7B) and replace if damaged.
5. Place deflector (7B) back tightly against the stops in the
casing. Install the rope packing (4) firmly into the groove,
using a suitable tool.
6. Install the next impeller (8B) on the shaft up against the
deflector (7B). Mark the shaft approximately 1/8" out and
withdraw the impeller to this point. Tighten the hub securely.
7. Install the spacer (14B) into the housing. Make sure spacer
and deflector (7B) are pressed back tightly and at a uni-
form distance from the end of the casing at four points.
8. Proceed in a like manner with remaining impellers, spacers
and deflectors.
9. Reassemble the end head (6) to the housing using a new
endhead gasket (12).
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Each machine is fully tested before leaving the Spencer factory
to be sure vibrations, if any, are well within specifications for this
particular machine. However, rough handling during shipment
or improper disassembly and reassembly of a machine can
upset its balance and/or result in excess vibration.
If there is any vibration due to an unbalanced condition after
assembly, use the following procedure.
After running at operating speed and when at rest, mark posi-
tion of end impeller hub on shaft. Loosen bolts or screws holding
impeller on shaft. Rotate impeller 90° on shaft. Retighten bolts
or screws. Run machine again at operating speed and check
vibration. Repeat this process until the best position is located
for the impeller on the shaft so that there is no vibration in the
machine.
NOTE: In the event of problems following repair procedures,
contact the Spencer Service Department or your Spencer
Representative, describing the nature of the difficulty. Also furnish
the machine serial number.