Waukesha Cherry-Burrell Maintenance
10/2010 95-03009 Page 37
Type 4 Double Seal The Type 4 Seal is essentially two Type 1 seals assembled back to back
in a chamber which bolts to the backplate in place of the stationary seat
retainer. Except for the additional components (chamber, seals), Type 1
and Type 4 components are interchangeable (Figure 36).
Disassembly of Type 4 Seal
Figure 36 - Type 4 Seal Components
A. Impeller F. O-ring L. Rotary Seal S. Stationary Seal
B. Backplate G. Washer M. O-ring T. L-gasket
C. L-gasket H. Spring Retainer N. NPT Port U. Seat Retainer
D. Stationary Seal J. Spring P. Flush Housing V. Hex Head Screw (4)
E. Rotary Seal K. Washer R. O-ring W. Set Screw
CAUTION: Handle the impeller/
backplate assembly with care to
prevent da
mage to the seal com-
ponents.
1. Shut off the product flow to the pump and relieve any product pres-
sure.
2. Shut off and lock out power to the pump.
3. Disconnect the suction and discharge pipe fittings.
4. Remove the casing clamp and casing. Slide the o-ring off the back-
plate.
5. Remove the impeller retainer bolt and shaft o-ring.
NOTE: The r
etainer bolt has standard right-hand threads.
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