5.
Tighten each bolt (C) evenly while slowly rotating shaft, until impeller just starts to rub against suc-
tion sideplate.
6.
Clamp a dial indicator to the power frame, with the button resting on the end of the shaft or against
the face of the coupling hub. Set indicator at 0.
7.
Loosen bolts (C).
8.
Be sure jam nuts on bolts (D) are loose. Tighten bolts (D) evenly while slowly rotating shaft, until
impeller/repeller just starts to rub on the stuffing box cover.
9.
The dial indicator will now show the total travel of the impeller. Divide the total travel by two to deter-
mine the proper front and back clearance; i.e. if total travel is 0.120", set clearance at 0.060".
10. Loosen bolts (D).
11. Tighten bolts (C) evenly until dial indicator reads the proper clearance (½ the total travel).
12. Tighten bolts (D) evenly. Check to make sure all bolts (C) are tight. Finally, tighten jam nuts on bolts
(D).
The impeller is now set with equal clearance on the front and back sides. Rotate shaft several times
to check for free turning.
NOTICE:
For pumps equipped with cartridge seals, the following steps must be taken after impeller ad-
justment to properly set the seal prior to start-up.
13. Tighten drive collar set screws.
14. Loosen and back off centering tabs.
WARNING:
Pump shall never be operated without coupling guard installed correctly.
6.3 Disassembly
WARNING:
Lock out driver power to prevent accidental start-up and physical injury.
The back pullout feature of this pump allows the complete back pullout assembly (bearing frame and ro-
tating element) to be removed without disturbing suction or discharge piping or driver.
The sectional and parts list contains a complete sectional view of the pump and parts list with the proper
identification numbers. Refer to this section as required during maintenance procedures and when order-
ing spare or repair parts.
To prepare for disassembly, proceed as follows:
1.
Lock out power supply to motor.
2.
Shut off all valves or equipment controlling flow to and from the pump.
WARNING:
Lock out driver power to prevent accidental start-up and physical injury.
WARNING:
Pump and components are heavy. Failure to properly lift and support equipment could result in
serious physical injury or damage to pumps. Steel toed shoes must be worn at all times.
6.3 Disassembly
36
3500XD Installation, Operation and Maintenance Instructions