Gorman-Rupp Pumps 03H1-GX390 1178614 and up - Manual (Page 27)

OM-04728 0 SERIES
MAINTENANCE & REPAIR PAGE E - 9
not to damage the stationary seat on the shaft
threads.
NOTE
If the intermediate was not separated from the en­
gine during disassembly, subassemble the O‐ring
into the stationary seat, and use a piece of plastic
pipe to press the seat into the intermediate bore un­
til fully seated. The O.D. of the pipe should be ap­
proximately the same as the O.D. of the seal spring.
Subassemble the rotating element into the retainer
and bellows, then slide this subassembly onto the
shaft sleeve (13) until the face of the rotating ele­
ment is just flush with the chamfered end of the
sleeve.
Slide the sleeve and seal parts onto the shaft until
the seal faces contact. Continue to push the sleeve
through the seal until the chamfered end seats
firmly against the shaft shoulder.
Install the seal spring and spring centering washer
(11).
Impeller Installation
(Figure 2)
Inspect the impeller (2), and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (12) as previously removed, and screw the
impeller onto the shaft until tight.
Pump Casing and Wear Ring Installation
(Figure 2)
If the wear ring (22) was removed for replacement,
press the replacement ring 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.
For maximum pump efficiency, the impeller should
be centered within the pump casing. To verify im­
peller positioning, measure the pump casing and
impeller as shown in Figure 4. Use these measure­
ments to calculate the required impeller location
(dimension E). Add or remove gaskets in the pump
casing gasket set (14) to obtain dimension E.
NOTE
When calculating pump casing positioning, Figure
20% compression for pump casing gaskets.
D
B
2
A B
2
C D
E
Step 2 Step 1 Step 3
A+
B
2
C+
D
2
E = -
Figure 4. Centering Impeller Within Pump Casing
Install the calculated thickness of pump casing
gaskets. Coat the threads of the studs (15) with pipe sealant, and secure the pump casing to the in­
termediate with the nuts (16).