Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 15)

DDiissaasssseem mbbllyy aanndd RReeaasssseem mbbllyy
IInnssttrruuccttiioonnss,, 44BBO OBB
W WAARRNNIINNG G:: DDIISSCCO ONNNNEECCTT AANNDD LLO OCCKK O OUUTT EELLEECCTTRRIICCAALL
PPO OW WEERR BBEEFFO ORREE PPEERRFFO ORRM MIINNG G M MAAIINNTTEENNAANNCCEE..
CCAAUUTTIIO ONN:: PPaarrttss m muusstt bbee rreeaasssseem mbblleedd iinn eexxaaccttllyy tthhee ssaam mee
rreellaattiivvee ppoossiittiioonnss.. TThheerreeffoorree,, iitt iiss rreeccoom mm meennddeedd tthhaatt eeaacchh
ppaarrtt bbee m maarrkkeedd aass iitt iiss rreem moovveedd ffrroom m tthhee m maacchhiinnee ttoo ffaacciillii--
ttaattee llaatteerr rreeaasssseem mbbllyy.. iitt iiss eessppeecciiaallllyy iim mppoorrttaanntt tthhaatt tthhee
llooccaattiioonn ooff eeaacchh iim mppeelllleerr,, aass wweellll aass iittss ppoossiittiioonn oonn tthhee
sshhaafftt,, bbee m maarrkkeedd..
When ordering replacement impellers and deflectors, refer to
Notes on accompanying illustrations.
CCAAUUTTIIO ONN:: M Moosstt ffoouurr--bbeeaarriinngg oouuttbbooaarrdd m maacchhiinneess hhaavvee aa
dduupplleexx ((ttaannddeem m)) bbeeaarriinngg aasssseem mbbllyy.. TThheessee bbeeaarriinnggss aarree aavvaaiill--
aabbllee oonnllyy ffrroom m SSppeenncceerr aass aa ccuussttoom m--m maattcchheedd sseett ooff ttwwoo:: oonnee
bbeeaarriinngg ffoorr tthhrruusstt aanndd oonnee bbeeaarriinngg ffoorr rraaddiiaall llooaadd.. TThheessee
bbeeaarriinnggss aarree nnoott iinntteerrcchhaannggeeaabbllee wwiitthh ccoom mm meerrcciiaallllyy aavvaaiillaabbllee
bbeeaarriinnggss ccaarrrryyiinngg tthhee ssaam mee ppaarrtt nnuum mbbeerr;; tthheeyy ccaann oonnllyy bbee
uusseedd IInn m maattcchheedd sseettss aass ffuurrnniisshheedd bbyy TThhee SSppeenncceerr TTuurrbbiinnee
CCoom mppaannyy.. FFoorr bbeesstt rreessuullttss,, ffoollllooww iinnssttrruuccttiioonnss eenncclloosseedd wwiitthh
eeaacchh m maattcchheedd sseett ooff bbeeaarriinnggss..
DDiissaasssseem mbbllyy && RReeaasssseem mbbllyy
1. Remove packing plate nuts from packing plate (32 and 20)
on each end of machine. Slide both packing plates and
packing (32 and 20) on shaft away from heads. Remove all
packing from packing box when applicable (38 & 39).
2. Remove snap ring and back off coupling sleeve. Check gap
between coupling hubs. See coupling manufacturerʼs
instructions for other than Sier Bath.
3. Measure distance “B” from outboard bearing bracket (19) to
outboard bearing cap (17). Remove bolts in thrust assembly
housing cap.
4. Remove lock nut (15) and washer from end of shaft, and
loosen bolt (19A) binding housing in bracket.
5. Remove bracket bolts (21). Using puller, remove complete
thrust assembly and bearings.
6. Remove bolts on end head, holding flat ring and end head to
housing. (Use a chain hoist if available to hold head while
removing bolts). After removal of end head, keep shaft
supported while removing internal parts.
7. Remove intake spiral (13) after marking position to insure
correct reassembly. See note (A).
8. Remove rope packing (10) and half deflector (26).
9. On other than keyed construction, measure distance from
impeller hub to any step or shoulder on shaft and mark for
reassembly. On stacked and keyed construction, remove
nuts and washers (24A) and shaft sleeves (24B). Remove
impeller (29) and its hub spacer, number or mark them for
replacement in their proper position. See note (B) following
paragraphs.
10. Check axial position of each deflector at 4 radial points with
reference to end of housing and record.
11. Remove spacer (27) holding rope packing in place. Number
or mark for replacement.
12. Remove rope packing holding deflector in place. Then pull
or work deflector (11) out of housing. Number or mark for
replacement.
13. Proceed to remove the remaining stages in the same way,
numbering or marking all impellers, spacers, deflectors, etc.,
to insure proper replacement.
14. Check deflector stops for damage.
15. Reassemble in reverse order, replacing end head gasket
(22) and any worn packing (32, 10, 25, 20).
TToo CChhaannggee tthhee IInnbbooaarrdd BBeeaarriinngg ((M Moottoorr EEnndd ooff tthhee M Maacchhiinnee))
1. Remove snap ring and back off coupling sleeve.
2. Check gap on coupling hubs.
3. Loosen and remove motor bolts, and slide motor back.
4. Remove coupling hub from machine shaft.
5. Remove packing plate nuts from packing plate (32 and 20)
on each end of machine. Slide both the packing plates and
packing (32 and 20) on the shaft away from the heads.
Remove all packing from packing box where applicable.
6. Remove bolts on both caps (8 and 8A) on three-arm bearing
bracket (33).
7. Slide front cap off shaft, and push back cap away from bracket.
8. Remove bolts holding inboard bracket in position while
supporting end of shaft.
9. Slide inboard bracket off bearing.
10. Remove locknut, washers, and bearing.
11. Replace bearing and parts in their proper order.
Realign coupling and check the hub before and after bolting
motor in place (Refer to page 5).
NNootteess::
(A) Upon reassembly, with all internal parts installed, the intake
spiral edge should project slightly beyond end of housing so that
end head will hold all stationary parts in position.
(B) On stacked and keyed impeller construction, the first nut
installed is tightened with a spanner wrench, then loosened one
full turn to allow for impeller hub expansion. The second nut is
brought up to the first nut with the lockwasher in between. Lock
nut in position with washer tabs.
BBaallaanncciinngg
Each machine is fully tested before leaving the Spencer factory
to be sure vibration, if any, is within specifications for the partic-
ular machine. However, rough handling during shipment or
improper disassembly and reassembly of a machine can upset
its balance and result in excess vibrations.
When a machine is being disassembled for repairs, mark the
parts as they are removed. There should be no vibration when
they are reassembled in the same order.
However, if impellers are being replaced or there is any vibration
due to an unbalanced condition after assembly, use the following
procedure:
If there is any vibration or unbalance, the coupling should be
checked first for misalignment. If realignment does not correct the
imbalance, rotate coupling hubs or machine shaft and motor
shaft in 90° increments until minimal vibration is obtained.
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.
1155