43
OPERATION AND MAINTENANCE MANUAL
QTS SERIES
Twin Screw Positive Displacement Pump
QTS-M
08
Bearing Arrangement and Replacement
The change of bearings is needed when the shafts have axial or radial play greater than
permissible. This play has to be measured and if it exceeds .006 in in radial play and .003 in in
axial play, bearing change is needed. Other signs that indicate bearing change is noise, rust or
rotors contact within the pump ratings.
The QTS uses two types of bearings per shaft, one needle bearing
(37)
in the front and three
angular contact ball bearings
(38)
in the back and are separated by a bearing spacer
(15).
The
needle bearings has an internal race that is kept in position by retaining rings
(36).
The ball
bearings have to be arranged depending on the main operating conditions of the pump. The
following image shows the two possible configurations.
Bearing removal
1. I
n the front side of the shaft, remove the
retaining ring
(36).
2.
Slide out the external race of the needle
bearing
(37).
3.
R emove angular contact ball bearings
with the aid of an extractor. Support only the
bearing inner race
(15)
and avoid damage to
the shaft.
IMPORTANT: The shaft needs to have enough
clearance to move out without scratching.
37
36
INNER RACE
EXTERNAL RACE
37
36
MAI
N
T
E
N
AN
C
E
STD
REV
TYPE 1
TYPE 2
