Viking Pump TSM153: N-R 333/4333 - Manual (Page 10)

SECTION TSM 153 ISSUE D PAGE 10 OF 16
JACKSCREWS
DISASSEMBLY
DANgER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
relief valve adjusting cap fitting, etc.)
Be sure:
1. That any pressure in the chamber has
been completely vented through the
suction or discharge lines or other
appropriate openings or connections.
2. That the driving means (motor,
turbine, engine, etc.) has been “locked
out” or made non-operational so that
it cannot be started while work is
being done on pump.
3. That you know what liquid the
pump has been handling and the
precautions necessary to safely
handle the liquid. Obtain a material
safety data sheet (MSDS) for the
liquid to be sure these precautions
are understood.
Failure to follow above listed
precautionary measures may result in
serious injury or death.
FIgURE 11
1. Mark head and casing before disassembly to ensure
proper reassembly. The idler pin, which is offset in pump
head, must be positioned toward and equal distance
between port connections to allow for proper flow of
liquid through pump.
It is not necessary to remove relief valve to take head
off pump; however, removing removing relief valve
will lessen total weight of part. Do not use chain or
cable around relief valve body to support head during
removal.
Remove nuts from head. Jackscrews should be used to
back head away from casing. Refer to figure 11. Proper
size and length of jackscrews for pump size are shown
in figure 12. The use of a hoist to support head will
facilitate its removal.
Back head away from casing, Remove head from pump.
Do not allow idler to fall from idler pin. To prevent this, Tilt
top of head back when removing.
2. Remove head gasket, idler and bushing assembly.
3. To remove rotor, loosen set collar behind mechanical
seal. Through the one inch jacket connection on top of
rotor bearing sleeve, remove 0.25” socket head pipe
plug.
Through the same hole loosen the 0.313” socket head
setscrews which lock collar to shaft. Rotate shaft to be
sure all setscrews have been loosened. Refer to figure
10, page 8, items 16 and 17, for pipe plug to remove the
setscrews to loosen.
4. Remove casing drain plug to break vacuum between
back of rotor and casing. Remove any deposit of material
from exposed portion of shaft between seal plate and
thrust bearing assembly.
5. Insert length of hardwood or brass through port opening
between rotor teeth to keep shaft from turning.
6. Bend up tang on lockwasher and with a spanner wrench,
remove locknut and lockwasher from shaft. Refer to
figure 13.
7. Remove length of hardwood or brass bar from port
opening.
8. Cushion end of shaft with a hardwood block or piece of
brass and drive rotor out of casing being careful to avoid
damaging rotor bearing sleeve bushing.
Support weight of rotor with a hoist. A cable sling can be
used around shaft, or around rotor teeth to carry weight
of part.
9. Loosen end cap lockscrews, disengage end cap locks
and with a spanner wrench, remove end caps. Examine
lipseal and replace if worn.
Remove roller bearings.
10. Remove nuts and capscrews and take off thrust bearing
housing.
11. Remove nuts holding seal plate and remove seal plate.
The stationary seal seat can be removed from seal
plate and rotating portion of seal from rotor bearing
sleeve, remove spring and set collar from bottom of seal
chamber.
12. Check rotor bearing sleeve bushing while rotor bearing
sleeve is mounted on casing. If worn bushing must be
replaced.
Disconnect flush line and remove rotor bearing sleeve
from casing.
A press must be used to remove old bushing. If bushing
has a shoulder on stuffing box end, it must be pressed
out mechanical seal end of rotor bearing sleeve.
Carbon graphite bushings are standard for Model 4333
pumps. To replace carbon graphite bushings, refer to
INSTALLATION CARBON gRAPHITE BUSHINgS,
page 14.