Viking Pump TSM630.3: N-RS Universal Seal - Manual (Page 6)

SECTION TSM 630.3 ISSUE H PAGE 6 OF 13
2. Remove head gasket, idler and bushing assembly.
3. Insert a length of hardwood or brass through port
opening between rotor teeth or lock coupling end
or shaft to keep shaft from turning. Bend up tang
of lockwasher and with a spanner wrench; remove
locknut and lockwasher from shaft. Remove length of
hardwood or brass from port opening.
4. Loosen the two setscrews in the face of the bearing
housing and remove the bearing housing assembly
from the bracket. Refer to Figure 5, page 5.
5. Remove pipe plug from drain hole in casing, breaking
vacuum behind rotor.
6. Remove packing gland capscrews. Slide packing
gland out of stuffing box, and remove packing and
packing retainer washer.
NOTE: Reference Mechanical Seal Replacement
beginning on page 7 when disassembling a seal pump.
7. Cushion end of shaft with a hardwood block and
drive rotor out of casing, being careful to avoid
damaging bracket bushing. Support weight of rotor
with a hoist. A cable sling can be used around shaft,
or around rotor teeth, to carry weight of part.
8. Loosen two radial setscrews in flange of bearing
housing and with a spanner wrench remove the
outer end cap with closure and outer bearing spacer
collar.
9. Remove the two tapered roller bearings from the
bearing housing.
10. Clean all parts thoroughly and examine for wear and
damage. Check lip seals, bearings, bushings, and
idler pin and replace if necessary. Check all other
parts for nicks, burrs, excessive wear and replace if
necessary. Wash bearings in clean solvent. Blow
out bearings with compressed air. Do not allow
bearings to spin; turn them slowly by hand. Spinning
bearings will damage bearing components. Make
sure bearings are clean, then lubricate with light
oil and check for roughness. Roughness can be
determined by turning outer race by hand.
CAUTION: Do not intermix inner and outer races of
tapered roller bearing.
NOTE: The R4327A pump has a special idler
arrangement, refer to Installation of Carbon
Graphite Bushings, page 10.
11. Casing can be checked for wear or damage while
mounted on bracket.
12. Inspect bracket bushing for wear and replace if
damaged or worn.
1. Install bracket bushing. If bracket bushing has a
lubrication groove, install bushing with groove at 12:00
o’clock position in bracket. If carbon graphite, Refer to
Installation of Carbon Graphite Bushings, page 10.
2. Install bracket and bushing assembly on the casing. The
locating pin is essential for proper alignment.
3. Coat shaft of rotor shaft assembly with light oil. Start
end of shaft in bracket bushing turning from right to left,
slowly pushing rotor in casing.
4. Coat idler pin with light oil and place idler and bushing on
idler pin in head. If replacing with carbon graphite bushing,
Refer to Installation of Carbon Graphite Bushings,
page 10.
5. Using a .010 to .015 inch thick head gasket, install head
and idler assembly on pump. Pump head and casing
should have been marked before disassembly to insure
proper reassembly. If not, be sure idler pin, which is offset
in pump head, is positioned toward and equal distance
between port connections to allow for proper flow of liquid
through pump.
Refer to Figure 5, page 5 for bearing housing assembly.
6. Install the lipseal in the bearing housing. See Figure 5,
page 5 for lip orientation.
7. Pack tapered roller bearings with grease and press or
push bearings into housing with large end of inner races
together. It is possible to install bearings incorrectly. For
proper assembly see Figure 5, page 5.
8. Install the lipseal in the end cap. See Figure 5, page 5
for lip orientation. Thread the end cap into the bearing
housing along with outer bearing spacer collar and
tighten against the bearing.
Tapered roller bearings require preload to operate
properly. To set preload tighten end cap so that inner
races of bearings cannot be rotated by hand. Make a
mark on the outside diameter of the bearing housing
and a corresponding mark on the bearing housing end
cap . Rotate the bearing housing end cap in a counter
clockwise direction until the mark on the outside diameter
of the bearing housing is past the mark on the bearing
housing end cap by 0.375 in. (9.52mm) for the N bearing
housing or 0.422 in. (10.72mm) for the R & RS bearing
housings. This will provide the correct end play for the
bearings.
Lock end cap in place with two setscrews in the flange of
the bearing housing.
9. When assembling a packed pump, use packing suitable
for liquid being pumped. Install packing, staggering the
joints from one side of shaft to other. Lubricate packing
rings with oil, grease, or graphite to aid assembly. Install
packing, studs, and nuts. Make sure gland is installed
square and nuts are tightened evenly. Tighten nuts until
packing gland is snug against packing. Do not over-
tighten!
NOTE: See Seal Installation on page 8 when
reassembling a mechanical seal pump.
ASSEMBLY