Maintenance
Waukesha Cherry-Burrell
®
Brand Universal 3 Pump
Page 86
95-03103
02/2021
Install Shaft
1. With the shims in place, install the shaft assembly in the front
bearing bore with the fluid end facing up. Ensure that the
shaft is installed in its original location.
NOTE:
The shafts may need to be removed for a final shim
adjustment.
2. Lubricate the outside diameter of the bearing.
3. Press the shaft into place until it is seated against the shim
pack.
Press only against the outer race of the bearing.
NOTE:
A tube of the same diameter as the outer race of the
bearing also can be used to press the shaft into place.
4. Temporarily secure the shaft/bearing in place with bearing
retainers to aid in checking the clearances.
DO NOT
install
silicone sealant at this time.
5. The bearing retainer (Figure 209, item B) must rest firmly
against the bearing. Leave a 0.010 to 0.050 in (0.25 to 1.25
mm) clearance between the back of the bearing retainer and
the front of the gear case (Figure 209, item A). If this
clearance is not met, place shims between the bearing
(Figure 209, item C) and retainer.
6. Temporarily mount the body on the gear case.
7. Secure the body to the gear case using the body retaining
screws.
8. Install the rotors and rotor nuts. Rotor nut O-rings and
retainer O-rings are not required at this time.
9. Measure the rotor backface clearance (Figure 210, item A)
through the port or from the front. The backface clearance for
both rotors must be the same to prevent rotor crossover
contact and must be ±0.0005" of the value found in Table 18,
“Rotor Clearances,” on page 89.
10. Check the rotor front face clearance (Figure 210, item C).
11. Check the rotor to body clearance (Figure 210 and
Figure 211, item B).
12. Check the clearances against Table 18, “Rotor Clearances,”
on page 89. For other non-standard rotors, check with
customer service.
NOTE:
If the process uses special clearance rotors, contact
customer service with the serial number of the pump for
clearance tolerance values.
NOTE:
“B” dimension is below the face of the casing.
13. If the backface clearance is not met, disassemble the pump
and adjust the shimming to achieve the correct backface
clearance.
14. If the rotor to body clearance is not met or is uneven, contact
SPX FLOW Application Engineering for proper adjustment
procedures.
15. After obtaining proper clearance, remove the rotor nuts,
rotors, body, and bearing retainers.
Figure 209 - Bearing Retainer
Clearance
PD100-072a
A
B
C
Figure 210 - Measure Clearance
A
C
B
Figure 211 - Measure Clearance
B
B