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Disassembly, Danger – Viking Pump TSM143: N-P 335/4335 User Manual

Page 5

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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