Xylem P81547D Series 90 In-Line Centrifugal Pump - Manual (Page 23)

If your seal size
is...
Then...
0.50 in. (1.27 cm)
and 0.75 in. (1.91
cm)
1. Place the new retainer in the seal recess of the faceplate.
2. Set the thin seat gasket in the recess and set the seat insert on top of the
gasket.
A ceramic insert has a top side and bottom side. The bottom is identifiable by
its slightly recessed grooves.
3. Make sure the grooves face down towards the rubber gasket.
1.25 in. (3.16 cm) 1. Set the seal insert into the elastomeric seat cup.
2. Lubricate the seat cup with soapy water and set it into the recess of the
faceplate.
2. Lubricate the rubber seal collar with soapy water.
The rotating seal assembly includes these parts:
• Seal ring
• Bellows
• Seal housing
3. Push the entire rotating seal assembly onto the shaft as one unit.
Do not attempt to assemble the seal by placing the components on the shaft
individually. Align the notches in the collar with the recesses found on each side of the
carbon ring.
4. Press the seal housing tightly against the upper end of the rubber collar.
Use a screwdriver and press at several points along the periphery in order to provide a
tight and even fit. Do not tap on the seal because you can break the ceramic or carbon
insert.
5. Place the seal spring on the shaft and then the spring retainer.
You do not need to do this for the 1.25 in. (3.16 cm) seal.
6. Place the impeller and lockwasher on the shaft.
7. Thread the impeller nut onto the shaft and tighten according to these values:
• 3/8 in. nut to 8 – 12 ft. lbs. (11 – 16 Nm)
• 7/16 in. nut to 17 – 22 ft. lbs (23 – 30 Nm)
• 3/8 in. capscrews to 10 – 14 ft. lbs (14 – 19 Nm)
Do not overtighten.
8. Clean the pump body of excess debris.
9. Place a new gasket in the recess of the pump body.
10. Replace the motor assembly by inserting the impeller in the pump body and evenly
tighten the eight capscrews.
See the Capscrew torque values.
Capscrew torque values
Capscrew torque in ft-lbs (Nm)
Capscrew
type
Head
marking
1/4 in. 5/16 in. 3/8 in. 7/16 in. 1/2 in. 5/8 in. 3/4 in. 7/8 in. 1 in.
SAE grade 2 6 (8) 13 (18) 25 (34) 38 (52) 60 (81) 120 (163) 190 (258) 210 (285) 300 (407)
Maintenance
22 Series 90 Installation, Operation, and Maintenance Manual