Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 32)

32 AF (42-66) IOM
4. Unlock driver power.
5. Make sure everyone is clear. Jog the driver just
long enough to determine direction of rotation.
Rotation must correspond to an arrow on bearing
housing.
6. Lock out power to driver.
7. Replace the V-belt guard.
CHECK IMPELLER CLEARANCE
Check impeller clearance before installing the pump.
The impeller must not rub when the shaft is turned by
hand, therefore it is recommended that the Impeller
Alignment Worksheet (shown on pg. 27) is filled out
and filed with the pump maintenance records for future
reference.
CHECK FOR FREE TURNING
Before the pump is started, rotate the pump by hand to
be sure it turns freely, and does not rub or bind.
BEARINGS
The bearing assembly uses spherical roller bearings to
carry the radial load, and a spherical roller thrust
bearing to carry the axial thrust load from the impeller.
The bearing housing has a horizontal split along the
centerline for ease of assembly and inspection.
LUBRICATION
The bearing uses oil bath lubrication. Oil lubricated
bearing assemblies are shipped without oil. Oil must be
added to the bearing housing before starting. Remove
the bearing housing breather (113A) and add oil until oil
level is at the center of the sight glass. If the unit has
an external oil lube system, fill the bearing housing and
the reservoir to satisfy the system requirements.
Replace the breather. Table 2.shows the oil volume
required.
Bearings must be lubricated properly in
order to prevent excess heat generation,
sparks and premature failure.
Run the pump for 1 minute to fill the oil galleys and in
and around each bearing. Check the sight glass and
add oil accordingly. Monitor the oil level indicator for
the first 24 hours of operation and maintain fill level.
OIL TYPE
Use an industrial quality lubrication oil such as Mobil
DTE series, Exxon Teresstic, or similar of ISO VG68.
ISO VG46 may be used in ambient temperatures
below 40F.
In any case the operating temperature viscosity must
be a minimum of 150SSU.
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 for the
bearings to have an 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.
OIL LEVEL CONTROL
If the level of oil in the bearing housing (134C) is too
high, excessive heat may be generated due to
churning. If the level is too low, excessive heat may be
generated due to inadequate lubrication. A liquid level
switch connected to the oil sump can be used to warn
of a dangerous oil level condition.
Observe the oil level requirements shown on the
assembly drawing furnished with the pump. If
excessive heat is experienced within these levels,
consult the factory. Be sure that the shaft centerline is
horizontal through the bearing housing
NORMAL BEARING TEMPERATURE
The running temperature for a bearing assembly
depends on many factors such as speed, bearing
loads, lubrication, ambient air temperatures, and
condition of bearings. Temperatures higher than the
human hand can tolerate are very satisfactory for
good bearing operation and should not cause any
alarm.
For a given speed and loading, the bearing housing
temperature will stabilize at some temperature, usually
AXIAL FLOW PUMP
APPROX. OIL VOLUME
Pump Size Quarts Liters
42” / 1200mm / 54” 74 70.5
60” / 66” 62 59
Approximate values only. Always fill using sight glass to
verify level. Oil level should be at the center of the sight
glass. See comments in this section.
Table 2