Model 640 & 640CC Instruction Manual
D01206676
Revision A February 2016
36
Servicing the Inner Magnetic Drive Shaft
12.9
It is sometimes necessary to remove the 3-0065 Plug Assembly
from the bottom of the 3-0062 Magnetic Drive Housing. The oil in
the magnetic drive can create a vacuum that makes removal of the
inner shaft difficult, especially if the housing is contaminated.
The inner shaft is composed of extremely powerful magnets. If
these magnets are allowed to get too close to steel objects the
magnetic force may cause injury or damage to the shaft. Also
keep the shaft away from metal filings, as they will adhere to the
shaft and cause premature wear.
1.
Pull the inner magnet shaft assembly out through the top of the pressure vessel.
2.
Unscrew the cup table from the magnet shaft assembly.
3.
Press the roll pin out of the thrust ring and remove the thrust ring. Take care
not to bend the shaft. Replace the thrust ring if badly worn.
4.
The upper bronze bearing may now be removed. Replace if badly worn.
5.
Remove the snap ring. Replace is corroded or damaged. The carbon bearing
or the 3-0073-1 Bronze Bearing may now be removed. Replace if badly worn.
6.
Remove the hex head screw and washer from the other end of the shaft to
remove the second bearing. Replace if badly worn.
7.
Assemble in reverse order of disassembly.
Servicing the Outer Magnetic Drive Rotator
12.10
Make certain that the power to the instrument is disconnected
before servicing the magnetic drive rotator. The rotator is very
close to the heater terminals and severe shock or electrocution
could occur if contact is made with a live heater circuit.
