Goulds Pumps CV 3171 - IOM - Manual (Page 26)

26
CV 3171 IOM 05/11
MAINTENANCE OF BALL/STEADY BEARINGS
BALL BEARINGS
The angular contact (thrust) bearing is pre-
lubricated at the factory. Regrease the bearing
according to Table 1.
STEADY BEARINGS
Steady bearings requiring grease lubrication are
pre-lubricated at the factory. Most bearings are set
up to automatically dispense lubrication via grease
cups mounted on the support plate.
Metallic steady bearings are grease lubricated. It
becomes difficult to keep grease in the housings
when handling hot liquids, caustic solutions or
solvents. Lack of lubrication can cause galling and
eventual seizing.
Sealed bearings are grease lubricated but they
retain the grease due to their dual seals on top and
bottom. If pressure cups are used they must be
kept full of grease at all times.
If manual greasing is used, regrease according to
Table 1.
TABLE 1
LUBRICATING INTERVALS
IN OPERATING HOURS
SPEED
<1800
RPM
1800
RPM 3000
RPM 3600
RPM
GROUP
S/ST 2000 2000 1200 750
M/MT 2000 1800 800 450
L 2000 1200 N/A N/A
REGREASE PROCEDURE -
BALL BEARING:
NOTE: When regreasing there is danger of
impurities entering the bearing shell. The
grease, the greasing device, and fittings must
be clean.
1. Wipe dirt from grease fittings.
2. Fill grease cavity through grease fitting (193B)
on bearing shell (134). Use recommended
grease and fill until fresh grease comes out of
the relief fitting (113) on the opposite side of the
bearing shell (See Figure 9).
3. Wipe excess grease from grease and relief
fittings.
4. Ensure relief port closes.
NOTE: The bearing temperature usually rises
after regreasing due to an excess supply of
grease. Temperature will return to normal after
the pump has run and purged the excess from
the bearings, usually two to four fours.
For most operating conditions a lithium complex
soap based grease of NLGI consistency No. 2 is
recommended. This grease is acceptable for
bearing temperatures of 5°F to 230°F (-15°C to
115°C). Bearing temperatures are generally about
20°F (18°C) higher than bearing housing outer
surface temperature.
CAUTION
Never mix greases of different
consistency (NLGI 1 or 3 with NLGI 2)
or different thickener. For example,
never mix a lithium based grease with a
polyurea based grease.
Figure 9