Maintenance
Waukesha Cherry-Burrell
Page 18
95-03074
Issued: January 2003
Revised: June 2005
Assembly of Pump
Tools Required
Soft-face hammer
3/4" socket wrench
.020" feeler gage
3/4" open end wrench
1/8" allen wrench
1/2" open end wrench
1/4" allen wrench
7/16" open end wrench
Backplate Assembly
1.
To determine number of shims needed to space
impeller from backplate while parts are in metal to
metal contact, hold impeller and backplate in place on
motor shaft and check shimming of impeller location
(Figure 24)
. If necessary, add or remove shims from
motor shaft so space between backplate and impeller
face is .020. When .020 clearance is achieved, clamp
backplate, assemble impeller retainer bolt and check
clearance again.
NOTE:
Any axial movement of shaft should not be added
to .020 nominal clearance (Figure 24). If needed, change
clearance by adding or removing shims. Shims (Figure 25,
item A) are added on drive shaft (Figure 25, item C)
behind impeller shaft (Figure 25, item B). Clean all parts
and lubricate all elastomer (rubber-like) parts with
sanitary lubricant.
2.
Remove impeller and backplate leaving shims on
motor shaft.
3.
Clean all parts and lubricate all elastomer (rubber-
like) parts with sanitary lubricant.
4.
Insert L-gasket (Figure 23, item D) into backplate seal
cavity.
5.
Place stationary seal into L-gasket. (Figure 23, item C
and D).
6.
Place seat retainer over stationary seal and secure
retainer with four 1/4-20 x 1/2 inch hex head cap
screws. (Figure 23, item B and A).
7.
Tighten cap screws evenly.
8.
Place impeller shaft end up on a clean flat surface and
slide assembled backplate onto impeller shaft.
NOTE:
Avoid hitting stationary seal against impeller
shaft to prevent seal from breaking.
CAUTION:
Handle impeller/backplate assembly
with care to prevent damaging seal components.
For ”Type 1 Seal Assembly‚" turn to page 19, column I.
For ”Type 4 Seal Assembly‚" turn to page 19, column II.
Figure 23 - Stationary Seal Assembly
Figure 24 - Clearance Between Impeller and Backplate
Figure 25 - Shims Locations
