Viking Pump TSM143: N-P 335/4335 - Manual (Page 9)

SECTION TSM 143 ISSUE E PAGE 9 OF 15
DANGER!
before opening any Viking pump liquid cham-
ber (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 the 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 the above listed precaution-
ary measures may result in serious injury or
death.
DISASSEMbly
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 towards and equal
distance between the port connections to allow for
proper flow of liquid through the pump.(Refer to figure
5)
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 the relief value body to support head during
removal. For PRESSURE RElIEf INSTRUCTIONS,
refer to page 13.
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 the head will facilitate its removal.
Back the head away from casing. Do not allow the idler
to fall from the idler pin. To prevent this, tilt the top of
head back when removing. Remove head from the
pump. If a hoist is not available, cribbing or blocking can
be used to support the head. This will eliminate having to
lift the head into position when reassembling the pump.
2. Remove the head gasket, idler and bushing assembly.
3. To remove the rotor, loosen the set collar behind the
mechanical seal. Through the one inch jacket connection
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
P 3 5.00 0.50” - 13 NC
A
fIGURE 12
MINIMUM JACKSCREW lENGTh
fIGURE 11
JACKSCREWS
on top of the rotor bearing sleeve, remove the 0.25”
socket head pipe plug. Through the same hole loosen
the 0.313” socket head setscrews which locks the collar
to the shaft. Rotate shaft to be sure all setscrews have
been loosened. Refer to figure 10, page 8, items 16 and
17, for the pipe plug to remove and the setscrews to be
loosened.
4. Remove the casing drain plug to break the vacuum
between back of the rotor and the casing. Remove
any deposits 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.
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.
9. Loosen the end cap lockscrews, disengage the end cap
THREADSIZE
fIGURE 13
LOCKWASHER WITH TANG LOCKNUT
ADJUSTING NUT LOCK
SELF-LOCKING PIN