Flowserve Chemstar standard - Manual (Page 28)

CHEMSTAR USER INSTRUCTIONS ENGLISH 71569185 02-10
Page 28 of 44 flowserve.com
e) The double row thrust bearing must not have a
filling slot, as such bearings are limited to taking
thrust in only one direction.
f) If the optional pair of angular contact bearings are
to be fitted, these must be mounted back-to-back,
with the wide thrust faces of the outer races
positioned together as shown below:
Optional angular contact bearings are
held in the bearing carrier by a snap ring [2530]
or a screwed retainer ring [3240.1] as shown
below.
g) The following methods are recommended for fitting
the bearings onto the shaft:
Method 1: Use a hotplate, hot bath, oven or
induction heater to heat the bearing race so it can
easily be placed in position then allowed to shrink
and grip the shaft. It is important that the
temperature is not raised above 100 ºC (212 ºF).
Method 2: Press the bearing onto the shaft using
equipment that can provide a steady, even load to
the inner race. Take care to avoid damaging the
bearing and shaft.
h) It is important that when installing the bearing it is
drawn up tight to the shaft shoulder as all the
bearings have a slight interference fit in their bore.
i) With double row thrust bearings place the inner
bearing snap ring [2530] over the shaft, with the
tapered face facing the impeller end before fitting
the outboard bearing. Note that Group D pumps
use the retainer [3240.1] as shown below.
j) With the optional pair of angular contact bearings,
or with Group D pumps, the bearing retainer ring
[3240.1] should be placed with the inner spigot
facing towards the coupling.
Group D Group B & C
Standard bearing carrier assembly
Optional bearing carrier assembly
Part no. Description
2100 Shaft
2530 Snap ring
3011 Ball bearing - inboard
3013 Ball bearing - outboard
3240 Bearing carrier
3712 Bearing locknut
4330.2 Outboard labyrinth
4610.3 O-ring - carrier
6541 Lock washer
6570.3 Screw
6700 Key
4310.2 Oil seal - outboard
6570.11 Socket head screws
3240.1 Bearing retainer - ring
Item [3240] is specific to the bearing
type and the way bearings are locked.
k) Press inboard bearing onto the shaft using
Method 1 or 2 above.
l) With bearings at ambient temperature, and on
the regreaseable lubricated pump only, the
bearings should be 30 to 50% filled with
approved grease on both sides of the races.
m) With the bearings at ambient temperature, fit the
outboard bearing locknut [3712] and lockwasher
[6541], tightening firmly. Bend the tab of the
lockwasher that lines up with a slot in the locknut.
n) Great care should be taken to clean all parts and
keep the unit free from dust and dirt.
o) Replacement of the radial lip seals (if fitted) and
O-rings is highly recommended.