Install The Impeller; Reinstall The Pump Assembly; Screw Torque Values; Dealer Servicing - Bell and Gossett 80 Series Instruction Manual

6.4.6 Install the impeller

1. Install the impeller, impeller washer, lockwasher, and capscrew.
2. Tighten the capscrew according to the Capscrew torque values table.

6.4.7 Reinstall the pump assembly

1. Install a new volute gasket.
2. Install the pump assembly into the volute.
3. Tighten the volute capscrews according to the Capscrew torque table.
4. Install a seal flushing tube if it is used.
5. Install the drain plug and close the drain valve.
6. Open the isolation valves and inspect the pump for leaks.
7. Return the pump to service if it is not leaking.

6.4.8 Screw torque values

Capscrew torque in ft-lb (Nm)
Capscrew Head
type marking
1/4
SAE grade 6 (8)
2
Brass and 4 (5)
stainless
steel
or
SAE grade 10 (14)
5
*The M6 set screw has a rating of 10 N m.

6.4.9 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
Series 80 INSTRUCTION MANUAL
Capscrew diameter (in inches)
5/16 3/8 7/16
13 (18) 25 (34) 38 (52)
10 (14) 17 (23) 27 (37)
20 (27) 35 (47) 60 (81)
1/2 5/8 3/4
60 (81) 120 (163) 190 (258)
42 (57) 83 (113) 130 (176)
90 (122) 180 (244) 325 (440)
6 Maintenance
7/8 1
210 (285) 300 (407)
200 (271) 300 (407)
525 (712) 800 (1085)
25