Viking Pump TSM163: N-R 337/4337 - Manual (Page 9)

FIgURE 13
LOCKNUT
LOCKWASHER WITH TANg
jACKSCREWS
FIgURE 11
THREAD SIZE
a
FIgURE 12
MINIMUM LENgTH OF jACK SCREWS
PUMP
SIZE
NO. SCREWS
USED
a
THREAD SIZE
(INCH)
N 2 4.00 0.50” - 13 NC
R 2 4.50 0.63” - 11 NC
7. Remove the length of hardwood or brass bar from the
port opening.
8. Cushion the end of the shaft with a hardwood block or
piece of brass and drive the rotor out of the casing being
careful to avoid damaging rotor bearing sleeve bushing.
Support the weight of rotor with a hoist. A cable sling can
be used around the shaft, or around the rotor teeth to
carry the weight of the part.
SECTION TSM 163 ISSUE D PAGE 9 OF 15
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.
1. Mark the head and casing before disassembly to ensure
proper reassembly. The idler pin, which is offset in
the pump head, must be positioned toward and equal
distance between the port connections to allow for proper
flow of liquid through the pump.
It is not necessary to remove the relief valve to take
the head off the pump; however, removing the relief
valve will lessen total weight of the part. Do not use
a chain or cable around relief valve body to support
head during removal. For PRESSURE RELIEF VALVE
INSTRUCTIONS, refer to page 14.
Remove the nuts from the head. Jackscrews should be
used to back the head away from the casing. Refer to
figure 11. The proper size and length of jackscrews for
the pump size are shown in figure 12. The use of a hoist
to support head will facilitate its removal.
Back the head away from the casing. Remove head from
the pump. Do not allow the idler to fall from the idler pin.
To prevent this, tilt the top of head back when removing.
2. Remove the head gasket, idler and bushing assembly.
3. To remove the rotor, remove seal plate nuts from studs
and remove seal plate, gaskets and stationary seat.
Remove Packing box extension and gasket. Loosen set
screws in mechanical seal retainer cartridge and remove
from rotor shaft. Refer to Figure 14, page 10.
4. Remove the casing drain plug to break the vacuum
between back of the rotor and the casing. Remove any
deposit of material from the exposed portion of the shaft
between the seal plate and the thrust bearing assembly.
5. Insert a length of hardwood or brass through the port
opening between the rotor teeth to keep the shaft from
turning.
6. Bend the tang on the lockwasher up and with a spanner
wrench, remove the locknut and lockwasher from the
shaft. Refer to figure 13 below.