UNIREX Pump User Manual
Page 35
MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 35 of 68
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5.2.2 Grease
5.2.2.1 Regreasable
Single shielded regreasable bearings
When the grease lubrication option is specified,
single shielded bearings, grease fittings and vent pipe
plugs are installed inboard and outboard.
The orientation of the bearing shields
is different for horizontal pumps (Standard,
Sealmatic, Unitized, Recessed, and Lo-Flo - see
figure 5-7) and In-Line pumps (see figure 5-8).
Figure 5-7: Horizontal pump shield orientation
Figure 5-8: In-Line pump shield orientation
Horizontal pump bearings are packed with Exxon
POLYREX EM grease prior to assembly. For
relubrication, a grease with the same type base
(polyurea) and oil (mineral) should be used. In the
case of the In-Line pump the bearings are packed
with Exxon Unirex N3 grease. For relubrication, a
grease with the same type base (lithium) and oil
(mineral) should be used. To regrease, remove the
pipe plug from both the inboard and outboard bearing
location. (See figure 5-9.) After relubricating the
bearings three times, it is typically recommended that
the bearing housing is cleaned out.
To regrease bearings under coupling
guard, stop pump, lock the motor, remove coupling
guard, and then regrease the bearings.
The amount of grease required for horizontal pumps
is shown in figure 5-10 and for In-Line pumps in
figure 5-11.
Figure 5-9: Regreasable configuration
Figure 5-10: Horizontal lubrication amounts
Housing
Initial lube
Relubrication
Group 1 inboard
Until grease
comes out of plug
7.5 cm
3
(0.46 in.
3
)
Group 1 outboard
Until grease
comes out of plug
14 cm
3
(0.85 in.
3
)
Group 1 duplex
34 cm
3
(2.1 in.
3
)
17 cm
3
(1.0 in.
3
)
Group 2 inboard
Until grease
comes out of plug
17 cm
3
(1.0 in.
3
)
Group 2 outboard
Until grease
comes out of plug
28 cm
3
(1.7 in.
3
)
Group 2 duplex
68 cm
3
(4.1 in.
3
)
34 cm
3
(2.1 in.
3
)
Group 3 inboard
Until grease
comes out of plug
30 cm
3
(1.8 in.
3
)
Group 3 outboard
Until grease
comes out of plug
54 cm
3
(3.3 in.
3
)
Group 3 duplex
115 cm
3
(7.0 in.
3
)
60 cm
3
(3.7 in.
3
)
Figure 5-11: In-Line lubrication amounts
Housing location
New bearing
Relubrication
Group 1 inboard
10 cm
3
(0.6 in.
3
)
7.5 cm
3
(0.46 in.
3
)
Group 1 outboard
20.5 cm
3
(1.3 in.
3
)
14 cm
3
(0.85 in.
3
)
Group 2 inboard
16.4 cm
3
(1.0 in.
3
)
17 cm
3
(1.0 in.
3
)
Group 2 outboard
47.4 cm
3
(2.9 in.
3
)
28 cm
3
(1.7 in.
3
)
*If new bearings are not lubricated, they should be packed prior to
installation and the housing lubricated as described above.
Do not fill the housing with oil when
greased bearings are used. The oil will leach the
grease out of the bearings and the life of the bearings
may be drastically reduced.
5.2.2.1 Grease for life
Double shielded or double sealed bearings
These bearings are packed with grease by the
bearing manufacturer and should not be relubricated.
The replacement interval for these bearings is greatly
affected by their operating temperature and speed.
Shielded bearings typically operate cooler.