Bell & Gossett P81568D Series 1535 - Manual (Page 22)

The rotating seal assembly includes these parts:
• Seal ring
• Rubber collar
• Brass collar
• Compression ring
4. 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.
5. 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.
6. Place the seal spring on the shaft and then the spring retainer.
7. Place the impeller and lockwasher on the shaft.
8. 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)
Do not overtighten.
9. Clean the pump body of excess debris.
10. Place a new gasket in the recess of the pump body.
11. Replace the motor assembly by inserting the impeller in the pump body and evenly
tighten the eight capscrews.
Tighten the 3/8 in. capscrews to 10 – 14 ft. lbs (14 – 19 Nm).
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)
Brass or
stainless
steel
or
4 (5) 10 (14) 17 (23) 27 (37) 42 (57) 83 (113) 130 (176) 200 (271) 300 (407)
SAE grade 5 10 (14) 20 (27) 35 (47) 60 (81) 90 (122) 180 (244) 325 (441) 525 (712) 800 (1085)
Dealer servicing
If trouble occurs that cannot be rectified, contact your local sales and service
representative and be prepared to provide this information:
1. Complete nameplate data of pump and motor
2. Suction and discharge pipe pressure gauge readings
3. Ampere draw of the motor
4. A sketch of the pump hook-up and piping
Maintenance
Series 1535 Installation, Operation, and Maintenance Manual 21