Viking Pump TSM163: N-R 337/4337 User Manual

Page 11

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SECTION TSM 163

ISSUE

D

PAGE 11 OF 15

Be especially careful to keep mechanical seal parts clean.

Minute dirt particles especially on seal faces, will cause

leakage. Never touch the seal faces with anything except

clean hands or a clean cloth.
1. Deburr the threads on the rotor shaft with a fine file and

place a layer of tape over the threads to protect the

rotor bearing sleeve bushing during assembly. Gently

radius leading edge of the largest diameter on the shaft

(.03 inch is sufficient to aid in seal installation). Smooth

radius with a very fine grit emery cloth. Polish the rotor

shaft from leading edge through mechanical seal area

with the emery cloth. Any scratches left on shaft in seal

area will provide leakage paths under mechanical seal.

2. Install the rotor bearing sleeve and gasket on the casing.

Coat both sides of the gasket with thread sealant (pipe

dope) and quickly install the gasket and rotor bearing

on the casing. Place a support under the rotor bearing

sleeve to prevent the casing and rotor bearing sleeve

from tilting down while the rotor is being installed.

3. Check the casing to be sure the drain plug has been

removed.

4. Coat the inner diameter of the rotor bearing sleeve

bushing with a thin coat of non-detergent SAE30 weight

oil.
Support the weight of the rotor with a hoist. A cable sling

can be used around the shaft, or around rotor teeth,

to carry weight of part while being assembled into the

casing.
Place the end of rotor shaft through casing into bushing.

Do not allow any portion of the shaft to strike the bushing.

A carbon graphite bushing can be severely damaged

if struck. Slowly turn the rotor from right to left while

pushing into the casing. Push the rotor as far into casing

as it will go.

5. Prior to installing the head, coat the casing face with

thread sealant (pipe dope) and place a new .015 inch

head gasket on the mounting studs. Coat the dry side of

the gasket with thread sealant (pipe dope) and prepare

to mount the head and idler assembly.

6. The pump head and casing were marked before

disassembly to ensure proper reassembly. If not, be

sure the idler pin, which is off set in the pump head, is

positioned toward and equal distance between the port

connections to allow for an even flow of liquid through

the pump.

NOTE: The R4337 pump has a special idler arrangement,

refer to section THRUST BEARINg AND IDLER END

CLEARANCE ADjUSTMENT, page 12.
Place the head on pump, slightly tilting top of the head

back away from casing until the crescent enters inside

diameter of the rotor. Rotate the idler on idler pin until

the idler teeth mesh with the rotor teeth. Raise the head

until the face of head is parallel with the face of casing

and then work into position. Care must be taken to avoid

damaging the head gasket. Fasten the head to casing

with head nuts and tighten evenly.
If the relief valve was removed from the head, install on

head with the adjusting screw cap pointed toward suction

port.

Refer to figure 15. For PRESSURE RELIEF

VALVE INSTRUCTIONS, refer to page 14.

7. Push the rotor back against the head.
8. Install the drain plug in the casing.
9. Wipe the shaft clean in seal area and thoroughly coat

with non-detergent SAE 30 weight oil.

Before installing parts contained in the mechanical seal,

refer

to figure 14, page 10 to become familiar with part name and

location in packing box extension.
10. A tapered seal installation sleeve for N & R size pumps

is available, at extra cost, from Viking pump Division.

11. Coat the large diameter of shaft, tapered sleeve, and

inside of diameter of seal with non-detergent SAE 30

weight oil.

12. Place the tapered installation sleeve (if on hand) and

install the seal on the shaft over the tapered sleeve.

Position the seal on the shaft inside the rotor bearing

sleeve bore with end of seal located 0.19 inch inside

the machined face of the rotor bearing sleeve.

Refer to

Figure 14, page 10.

13. Tighten all seal drive set screws securely to the shaft.
14. Remove the tapered installation sleeve.
15. Place the gasket on the packing box extension and

install the extension with machined pilot inside the rotor

bearing sleeve bore.

16. Place the seat gasket over the shoulder of the stationary

seal seat and insert seat into the seal plate. Place the

remaining seat gasket over shoulder of polished surface

of stationary seat.

Refer to Figure 14, page 10.

17. Place the seal plate with the stationary seat over the

mounting studs and push the shoulder of stationary seat

into the packing box extension, the polished face against

the carbon rotating face.

18. Install the nuts on mounting studs and against seal holder.

Tighten the nuts evenly so the seal plate and stationary

seat will not be distorted when seal is compressed.

INLET

OR

SUCTION

OUTLET

OR

SUCTION

RELIEF

VALVE

ADjUSTINg

SCREW

FIgURE 15

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