Viking Pump TSM163: N-R 337/4337 - Manual (Page 11)

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