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MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 51 of 68 flowserve.com
a) Install the inboard bearing [3011] on the shaft [2100].
Mark 3A and ANSI 3A design
The inboard bearing must be positioned against
the shoulder as shown in figure 6-22.
Mark 3 design
On Group 1 and Group 2 shafts, the inboard
bearing must be located as shown in figure 6-24.
On Group 3 shafts position the inboard bearing
against the shoulder.
Figure 6-24: Bearing position - Mark 3 design
Mark 3 standard shaft Mark 3 duplex bearing shaft
Group A Group A
1
68 mm (2
11
/
16
in.)
1
61 mm (2
3
/
8
in.)
2
139 mm (5
15
/
32
in.)
2
129 mm (5
3
/
32
in.)
3
*
3
*
* Inboard bearing located against shoulder.
If the power end is equipped with single shielded
regreasable bearings, see figures 5-7 and 5-8 for
proper orientation of the shields
The orientation of the bearing shields is
different for horizontal pumps (figure 5-7) and In-Line
pumps (figure 5-8).
b) Install the outboard bearing retaining device onto
the shaft.
Double row bearings
Place the snap ring [2530] onto the outboard end of
the shaft and slide down to the inboard bearing.
The proper orientation of the snap ring
must be assured in this step. The flat side of the
snap ring must face away from the inboard bearing.
Duplex angular contact bearings
Place the bearing retainer [2530.1] onto the
outboard end of the shaft and slide down to the
inboard bearing.
The proper orientation of the bearing
retainer must be assured in this step. The small
side of the retainer must face away from the
inboard bearing.
Figure 6-23: 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
6207-C3 5306-AC3 or 3306-AC3 7306-BECBY
Regreasable - single shielded
2
6207-ZC3 5306-AZC3 or 3306-AZC3 NA
6
Greased for life - double shielded
3
6207-2ZC3 5306-A2ZC3 or 3306-A2ZC3 NA
7
1
Sealed for life - double sealed
4
6207-2RS1C3 5306-A2RSC3 or 3306-A2RS1C3 NA
7
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
Oil bath/mist - open
1
6314-C3 5314-AC3 or 3314-AC3 7314-BECBY
Regreasable - single shielded
2
6314-ZC3 5314-AZC3 or 3314-AZC3 NA
6
Greased for life - double shielded
3
6314-2ZC3 5314-A2ZC3 or 3314-A2ZC3 NA
7
3
Sealed for life - double sealed
4
6314-2RS1C3 5314-A2RSC3 or 3314-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.