Flowserve PolyChem GRP - Manual (Page 42)

USER INSTRUCTIONS POLYCHEM GRP ENGLISH 71569132 12-04A
Page 42 of 52
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Both bearings have a slight interference
fit which requires that they be pressed on the shaft with
an arbor or hydraulic press. Figure 6-20 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.
An alternate method of installing bearings is to heat
the bearings to 93 °C (200 °F) by means of an oven
or induction heater. With this approach the bearing
must be quickly positioned on the shaft. Never heat
the bearings above 110 °C (230 °F). To do so will
likely cause the bearing fits to permanently change,
leading to early failure.
a) Install the inboard bearing [3011] on the shaft
[2100] against the shoulder as shown in figure
6-22. If the power end is equipped with single
shielded regreasable bearings. (See figure 5-8
for proper orientation of the shields.)
b) Install the outboard bearing retaining device onto
the shaft.
Double row bearings. Place the snap ring
[2530.1] onto the outboard end of the shaft and
slide down to the inboard bearing. Note, 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 [2530.2] 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.
c) Install the outboard bearing.
Double row bearings. Install the outboard bearing
[3013] firmly against the shoulder as shown in
Figure 6-22. If hot bearing mounting techniques are
used, steps must be taken to ensure the outboard
bearing is firmly positioned against the shaft
shoulder. The outboard bearing, while still hot, is to
be positioned against the shaft shoulder.
Duplex angular contact bearings. Duplex angular
contact bearings must be mounted back-to-back
with the wider thrust sides of the outer races in
contact with each other as shown in figure 6-24.
Only bearings designed for universal mounting
should be used. SKF’s designation is “BECB”.
NTN’s designation is “G”.
A special shaft is required when using
duplex angular contact bearings.)
It must be understood that fixtures
and equipment used to press the bearing must be
designed so no load is ever transmitted through the
bearing balls. This would damage the bearing.
Figure 6-24
d) After the bearing has cooled below 38 °C (100 °F)
the bearing should be pressed against the shaft
shoulder. Figure 6-25 identifies the approximate
force needed to seat the bearing against the shaft
shoulder. If a press is not available the locknut
[3712.1] should be installed immediately after the
bearing is placed on the shaft and tightened to
ensure the bearing remains in contact with the
shaft shoulder. The locknut should then be
retightened repeatedly during the time the bearing
is cooling. Once cool the locknut should be
removed.
Figure 6-25
Pump
Press force
N (lbf)
Locknut torque
Nm (lbf▪ft)
Group 1 5 780 (1 300) 27 +4/-0 (20 +5/-0)
Group 2 11 100 (2 500) 54 +7/-0 (40 +5/-0)
Group 3 20 000 (4 500) 95 +7/-0 (70 +5/-0)
e) Install lockwasher [6541.1] and locknut [3712.1].
The locknut should be torqued to the value shown
in figure 6-26. One tang on the lockwasher must be
bent into a corresponding groove on the locknut.
6.10.1.2 Bearing housing seals
6.10.1.2a Lip seals.
If lip seals were used (see figure 6-16), install new lip
seals in the bearing carrier [3240] and the housing
[3200 - Group 1] or the adapter [1340 - Group 2 and
3]. The lip seals [4310.1 and 4310.2] are double lip
style, the cavity between these two lips should be
1
/
2
to
2
/
3
filled with grease. When installing this part, the
large metal face on the lip seal must face away from
the bearings.
6.10.1.2b Labyrinth seals.
The following are general installation instructions
regarding the VBXX Inpro seal. Follow the
instructions provided with the seal by the
manufacturer.