SPP Pumps Thrustream - Manual (Page 13)

Operators Instructions for Horizontal
Standard Thrustream Centrifugal Pumps
Manual No/Rev
W12-003E / 6
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 13 of 28
Exerting force on the outer ring of a ball
bearing can cause severe damage.
The work area and all tools used for bearing
replacement must be clean and free of dust
and grit to prevent contamination of a clean
bearing and new grease.
Ball bearings should not be dismantled.
These instructions are written to cover
replacement of the drive-end bearings, but
they may also be applied for the non-drive end
bearings.
ATTENTION Where cartridge mechanical seals
are fitted, before replacing any pump
bearing, the mechanical seals must be
backed off from the seal chamber to prevent
damage to the seal faces. Refer to the seal
manufacturer’s instructions in Appendix III.
When replacing all the bearings, complete the
replacement of the non-drive end bearings
BEFORE commencing to replace the drive
end bearings.
Non-Drive End Bearing Replacement Procedure
1. Remove the four hexagon screws and
washers (61A &61F) and pull the bearing
housing (A62) off the bearing (66). If needed,
a pair of pry bars may be used to lever the
bearing housing off the bearing.
2. Using a suitable punch, flatten the lock washer
(75F) and unscrew the bearing locknut (75).
3. Fit a suitable bearing puller in place and pull
the bearing off the shaft end.
4. Clean the bearing thoroughly with an approved
cleaning fluid.
5. Dry the bearing with dry compressed air or
with a clean soft cloth by hand.
6. DO NOT SPIN A CLEAN DRY BEARING.
7. Inspect the bearing for wear, fractures, cracks,
corrosion or other damage, which may
necessitate replacement.
8. Lightly oil the bearing and wrap them in
greaseproof paper to prevent contamination
before reassembly.
9. Check that the shaft and bearing housing are
clean and undamaged.
10. It is recommended that a new oil seal (72) is
fitted when bearings are replaced to ensure
that contamination is prevented.
11. Wipe the ‘oil seal recess in the support frame
(61) with grease, slide the new oil seal onto
the shoulder ring (77) and locate in the recess
in the support frame.
12. Heat the bearing (66) to approximately 100 0 C
(212 0 F) using bearing hotplate, induction
heater or oven. NOTE - Do not exceed 120
0
C
(248
0
F).
13. Slide the heated bearing onto the shaft to abut
the shoulder. Ensure that the bearing sits fully
and squarely against the shoulder.
14. Place the locking washer (75F) onto the shaft
and screw on the bearing lock nut (75).
15. Fit and tighten the bearing locknut to 300 Nm
and lift the tab of the lock washer.
16. Cool the bearing to room temperature and
coat both sides with two/three ounces of
recommended grease.
17. Coat the inside of the bearing housing (A62)
with grease and slide into place over bearing.
18. Fit four hexagon screws and washers (61A &
61F), tighten evenly to pull the bearing
housing into place.
Drive End Bearing Replacement Procedure
To inspect or replace the drive end bearings
without removal of the rotating assembly from
the pump casing, it is necessary to remove the
pump shaft coupling and ensure that there is
sufficient clearance between the pump shaft
and the motor coupling. If a spacer coupling
has not been used it may be necessary to
demount the motor to achieve the required
clearance.
1. Remove the four hexagon screws and
washers (61A &61F) and pull the bearing
housing (B62) off the bearing (67). If needed,
a pair of pry bars may be used to lever the
bearing housing off the bearing.
2. Fit a suitable bearing puller in place and pull
the bearing off the shaft end.
3. Clean the bearing thoroughly with an approved
cleaning fluid.
4. Dry the bearing with dry compressed air or
with a clean soft cloth by hand.
5. DO NOT SPIN A CLEAN DRY BEARING.
6. Inspect the bearing for wear, fractures, cracks,