Viking Pump TSM143: N-P 335/4335 - Manual (Page 5)

SECTION TSM 143 ISSUE E PAGE 5 OF 15
A
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 above listed precaution-
ary measures may result in serious injury or
death.
4. Remove the packing gland nuts and slide the gland out
of the rotor bearing sleeve.
5. Insert a length of hard wood or brass bar through the
port opening between the rotor teeth to keep the shaft
from turning.
6. Bend the tang on the lock washer up, and with a spanner
wrench remove the locknut and lockwasher from the
shaft. Refer to Figure 7.
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 casing, being
careful to avoid damaging the rotor bearing sleeve
bushing. Support the weight of rotor with a hoist. A cable
sling can be used around the shaft, or around rotor
teeth, to carry the weight of the part.
9. Remove the end cap lockscrews, disengage the end cap
locks and with a spanner wrench remove the end caps.
Remove the roller bearings.
10. Remove the nuts and capscrews and take off the thrust
bearing housing. Remove the packing from the rotor
bearing sleeve. NOTE: Model P335 has a lantern ring.
11. Check the rotor bearing sleeve bushing while the rotor
bearing sleeve is mounted on the casing. If worn, the
bushing must be replaced.
Disconnect the circulation line and remove the rotor
bearing sleeve from casing. A press must be used to
remove the old bushing. If the bushing has a shoulder
on the stuffing box end, it must be pressed out through
ThREAD SIZE
JACKSCREWS
fIGURE 5
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
fIGURE 6
MINIMUM JACKSCREW lENGTh
1. Mark the head and casing before disassembly to ensure
proper reassembly. The idler pin, which is offset in 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 the total weight of the part. Do not use chain
or cable around the relief value body to support the
head during removal. For PRESSURE RElIEf VAlVE
INSTRUCTIONS, refer to page 14 .
Remove all nuts from the head. Jackscrews should be
used to back the head away from the casing as shown
in Figure 5. For proper size and length of jackscrews for
pump size refer to the table in Figure 6. The use of a hoist
to support 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 the
head back when removing. Remove the head from pump.
If a hoist is not available, cribbing or blocking can be used
to support 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. Remove the pipe plug from the drain hole in the casing,
this breaks the vacuum behind rotor.
DISASSEMbly