Gorman-Rupp Pumps 04A3-B 818101 and up - Manual (Page 29)

OM-01207 0 SERIES
MAINTENANCE & REPAIR PAGE E - 9
Subassemble the O‐ring onto the stationary seat
and lubricate it with water or light oil. Use even
pressure to press the stationary portion of the seal
into the seal plate until it seats squarely against the
shoulder bore.
Carefully slide the assembled seal plate and sta­
tionary portion of the seal over the shaft and secure
the seal plate to the pedestal with the machine
screws (48).
Subassemble the rotating element into the retainer
and bellows. Lubricate the I.D. of the bellows with
water and slide this subassembly over the shaft
sleeve (10) until the seal face is just flush with the
undercut end of the sleeve.
Slide the assembled shaft sleeve and rotating por­
tion of the seal and onto the shaft until the polished
faces contact. Continue to push the sleeve through
the seal until it is fully seated against the shaft
shoulder.
Install the seal spring.
Impeller Installation
Inspect the impeller and replace it if cracked or
badly worn.
For maximum pump efficiency, the impeller should
be centered within the volute scroll.
To verify the impeller positioning, measure the
pump casing and impeller as shown in Figure 3.
Use these measurements to calculate the required
impeller location (dimension E). Add or remove im­
peller adjusting shims (53) until dimension E is ob­
tained.
D
B
2
A B
2
C D
E
Step 2 Step 1 Step 3
A+
B
2
C+
D
2
E = -
Figure 3. Centering Impeller Within Volute Scroll
Install the correct thickness of impeller shims and
install the impeller key (9) in the shaft keyway. Align
the impeller keyway with the key and slide the im­
peller onto the shaft until fully seated. Make sure
the seal spring seats squarely over the shoulder on
the back of the impeller.
Immobilize the impeller by inserting a bar between
the impeller vanes, being careful not to damage
the vanes. Secure the impeller with the hardware
(45, 46 and 47). Remove the bar from the impeller
vanes.
Pump Reassembly
If removed at disassembly, press the replacement
wear ring (42) into the pump casing until it seats
squarely against the shoulder bore.
The wear ring must seat squarely in the
casing bore or binding and/or excessive
wear will result.