Goulds Pumps AF (Axial Flow) (6"-36) MXR Bearings" - Manual (Page 41)

AF (6-36) IOM 39
or an equal quality grade oil. However, a good grade
of non-detergent oil of SAE#30 or #40 is usually
satisfactory. Consult a reputable supplier for
acceptable substitutes for the oils mentioned.
The viscosity of the oil should be 150 SSU at the
operating temperature to prevent accelerated bearing
wear. 150
 F is the maximum temperature at which a
typical 30 wt. oil will supply the required viscosity.
For the best results, the minimum oil viscosity should
be maintained as follows:
Operating temp. below 150
F - SAE 30
Operating temp. below 160
F - SAE 40
Operating temp. below 180
F - SAE 50
An oil with a higher viscosity than required will increase
the bearing operating temperature because of the extra
viscous drag, but never to the point where the viscosity
becomes lower than required from the increased heat
generation. It is therefore better on bearings to use oil
that is too heavy rather than too light.
Change the oil after the first 200 hours of operation.
For normal operating conditions, change the oil at least
four (4) times a year. If the bearing assembly is
exposed to dirty or moist conditions, the oil should be
changed more often.
GREASE LUBRICATED BEARINGS
(6-18 inch sizes only)
The bearings are pre-lubricated at the factory. Re-
grease bearings every 500 operating hours or after
every 3 weeks of continuous operation.
Re-grease Procedure:
NOTE: When re-greasing there is danger of
impurities entering the bearing housing. The
grease container, the grease device, and fittings,
must be clean.
1. Wipe dirt from the grease fittings.
2. Fill both grease cavities through the grease fittings
(193A and 193B) found on the bearing housing
(134C). Use recommended grease and fill until
slight resistance is felt in the grease gun, see Fig.
25.
3. Wipe excess grease from fittings.
4. Ensure the bearing housing labyrinth seals are still
seated in place and have not been pushed from
their seats by grease pressure.
NOTE: The bearing temperature usually rises after
re-greasing due to an excess supply of grease.
Temperature will return to normal after pump has
run and purged excess from the bearings, usually
two to four hours.
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 -15
F to 350F (-26C to 177C). If
another brand is desired, it should be checked with
the supplier for being equivalent to the above.
Bearing temperatures are generally about 20
F (18C)
higher than bearing housing outer surface
temperature.
LUBRICATING GREASE
REQUIREMENTS
Lubricant
Brand
Pumpage temp.
below 350
F
(177
C)
Pumpage temp.
above 350
F
(177
C)
NLGl Grade 2 3
Mobil Mobilux #2 -----
Mobil Mobilith AW2 Mobilith AW3
Humble Lidok #2 -----
Exxon Unirex N2 Unirex N3
Shell Alvania #2 -----
Sunoco Multipurpose EP -----
SKF LGMT 2 LGMT 3
Texaco Regal Starfak #2 -----
Table 3
Fig. 25
193B
193A
5