SECTION TSM 630.3 ISSUE L PAGE 6 OF 12
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 7, page 5 for bearing housing assembly.
6. Install the lipseal in the bearing housing. See Figure 7,
ASSEMBLY
DANGER !
Before starting pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may
result in serious injury or death.
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 7, page 5.
8. Install the lipseal in the end cap. See Figure 7, 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.
10. Thread the bearing housing with lipseals, end cap, outer
bearing spacer collar and bearings installed into bracket.
11. Put lockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor
teeth to keep shaft from turning. Tighten locknut to 170-
190 ft.-lbs. torque. If tang does not line up with slot,
tighten locknut until it does. Failure to tighten locknut
or engage lockwasher tang could result in early bearing
failure and cause damage to rest of pump. Bend one tang
of the lockwasher into a slot on the locknut. Remove the
length of hardwood or brass from the port opening.
12. Adjust pump end clearance as in Thrust Bearing
Adjustment page 9.
13. Reinstall drain plug in casing. Lubricate all grease
fittings with multi-purpose grease, NLGI #2.
