Flowserve Mark 3 - Manual (Page 36)

USER INSTRUCTIONS MARK 3 High Silicon Iron ENGLISH 71569249 09-04
®
Figure 6-20: Flowserve Mark 3 bearings
Group Type of bearing
Inboard single row,
deep groove
5
Outboard double row, angular
contact, deep groove
5 & 9
Optional outboard
duplex angular contact
5
Oil bath/mist - open 1 6310-C3 5310-AC3 (AHC3) or 3310-AC3 7310-BECBY
Regreasable – single shielded 2 6310-ZC3 5310-AZC3 or 3310-AZC3 NA 6
Greased for life - double shielded 3 6310-2ZC3 5310-A2ZC3 or 3310-A2ZC3 NA 7
2
Sealed for life - double sealed 4 6310-2RS1C3 5310-A2RSC3 or 3310-A2RS1C3 NA 7
Notes:
1. These bearings are open on both sides. They are lubricated by oil bath or oil mist.
2. These bearings are pre-greased by Flowserve. Replacement bearings will generally not be pre-greased, so grease must be applied by
the user. They have a single shield, which is located on the side next to the grease buffer, or reservoir. The bearings draw grease from
the reservoir as it is needed. The shield protects the bearing from getting too much grease, which would generate heat. The grease
reservoir is initially filled with grease by Flowserve. Lubrication fittings are provided, to allow the customer to periodically replenish the
grease, as recommended by the bearing and/or grease manufacturer.
3. These bearings are shielded on both sides. They come pre-greased by the bearing manufacturer. The user does not need to regrease
these bearings. The shields do not actually contact the bearing race, so no heat is generated.
4. These bearings are sealed on both sides. They come pre-greased by the bearing manufacturer. The user does not need to regrease
these bearings. The seals physically contact and rub against the bearing race, which generates heat. These bearings are not
recommended at speeds above 1750 r/min.
5. The codes shown are SKF codes. Inboard and outboard bearings have the C3, greater than “normal” clearance. These clearances are
recommended by SKF to maximize bearing life.
6. Regreasable - single shielded bearings are not available in the duplex configuration; however, open oil bath-type bearings can be used
for the regreasable configuration. These bearings must be pre-greased during assembly. Lubrication fittings are provided, to allow the
user to periodically replenish the grease, as recommended by the bearing and/or grease manufacturer.
7. Not available.
8. All bearing configurations are supplied only with steel cages
9. SKF - the 5300 and 3300 bearing series are identical and therefore can be used interchangeably.
If this occurs in the seal flush system, small orifices can
become blocked effectively shutting off flow. For this
reason, Flowserve does not recommend the use of
PTFE tape as a thread sealant.
Flowserve has investigated and tested alternate
sealants and has identified two that provide an
effective seal, have the same chemical resistance as
the tape, and will not plug flush systems. These are
La-co Slic-Tite and Bakerseal. Both products contain
finely ground PTFE particles in an oil based carrier.
They are supplied in a paste form which is brushed
onto the male pipe threads. Flowserve recommends
using one of these paste sealants.
Full thread length engagement is required for all
fasteners.
Refer to figure 6-2 for recommended bolt
torques.
6.9.1 Power end assembly
The Mark 3A design has an optional oil slinger. If the
slinger was removed during disassembly, install a
new slinger [2540]. (See figure 6-19.)
Figure 6-19
6.9.1.1 Bearing installation
Mounting of bearings on shafts must be done in a
clean environment. Bearing and power end life can
be drastically reduced if even very small foreign
particles work their way into the bearings. Wear
clean gloves.
Bearings should be removed from their protective
packaging only immediately before assembly to limit
exposure to possible contamination. After removing
the packaging they should only come in contact with
clean hands, fixtures, tools and work surfaces.
The chart shown in figure 6-20 gives the SKF part
numbers for bearings in Flowserve Mark 3 pumps. Note
that the term “inboard bearing” refers to the bearing
nearest to the casing. “Outboard bearing” refers to the
bearing nearest to the motor. (See figure 6-19.)
Both bearings have a slight interference
fit which requires that they be pressed on the shaft with
an arbor or hydraulic press. Figure 6-17 identifies the
bearing fits. Even force should be applied to only the
inner race. Never press on the outer race, as the force
will damage the balls and races.
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