Pulsafeeder Isochem RGT IOM - Manual (Page 14)

9
6.2 Disassembling the No. 10 Pump
The item numbers listed in parenthesis refer to the exploded drawings found in Appendix B.
1. Close the suction and discharge valves.
2. Disconnect the power source from the motor.
3. Flush and drain the pump, and disconnect the piping.
4. Drain the containment can through the rear housing drain plug (item 27) (refer to Figure 4).
5. Remove the cover bolts (items 15) and remove the front cover (item 2) by carefully
withdrawing it straight back to avoid damage as the drive shaft (item 4) is withdrawn from
the cover bearing (item 9).
6. The two housing pins (items 13) should remain in place in the rear housing (item 1).
7. Remove the thin plastic shims (item 3), if any, between the cover and the housing.
(The standard shim is plastic. Metal shims are used at higher temperatures.)
8. Remove the rear housing screws (item 26) and separate the rear housing (item 1) from the
casing (item 20). This will require physical force to overcome the magnetic attraction
between the drive and driven magnet assemblies. Do not pry on one edge, but carefully
withdraw it straight back to avoid damage. The magnets are fragile and easily damaged by
rough handling. Two people may be required to separate the magnets safely.
9. Use a small screwdriver to remove the retaining ring (item 14) from the impeller assembly
(item 6) shaft at the rear of the driven magnet assembly (item 18) and withdraw the driven
magnet assembly (item 18) from the impeller assembly shaft, taking care to retain the
magnetic coupling drive key (item 8).
10. The spool is removed by removing the motor bolts (item 23) and withdrawing it back from
the motor.
11. Remove the retaining ring (item 14) at the rear of the rear housing (item 1) from the impeller
assembly (item 6) shaft.
12. Remove the impeller assembly from the front of the rear housing.
Do not remove the drive magnet assembly unless it or the motor is to be replaced.