Parr Instrument A1120HC10 - Manual (Page 2)

A1120HC10 Magnetic Drive
P a r r I n s t r u m e n t C o m p a n y 2
Bushing Removal
Remove the A1125HC inner rotor assembly from the
1135HC4 housing, the upper thrust washer 1132HC
sits on top of the inner rotor. The lower thrust
washer will be loose and also easily removed. Two
1133HC bushings are located in the 1135HC4 hous-
ing. The third 1133HC bushing is located in the end
cap. A 1948HC bushing removal tool is recom-
mended to remove these bushings.
Once the inner rotor, thrust washers and bushings
are removed, inspect the housing for any material
deposits that may have collected during operation.
When this unit is completely assembled, there is
about 5 ml of gas space surrounding the inner rotor
assembly. With some applications material may
condense in this area which would necessitate peri-
odic cleaning to remove any build up of debris.
Parr Magnetic Drive
Bushing Installation
There are two 1133HC bushings required in the low-
er portion of the 1135HC4 housing. A 1947HC bush-
ing installation tool is recommended to install these
bushings. Install one bushing into the housing until
it stops against the lower shoulder of the housing.
The second bushing should be installed so that the
top of the bushing is .020” below the larger diam-
eter area of the housing. The 1947HC installation
tool will accomplish this. This leaves a small internal
space between the two bushings in the housing.
Install the third 1133HC bushing in the end cap.
After cleaning the rotor and the chamber, install the
inner rotor as follows:
1. Set the lower thrust washer into posi tion so
that it will be available to cushion the rotor if it
should accidentally slam into the bottom of the
chamber.
2. Lower the rotor into the chamber slowly, but be
prepared to resist the strong pull of the outer
magnets during this operation. Use the same
rod employed when removing the rotor to resist
the strong pull during assembly.
3. Replace the upper sleeve bushing and the O-ring
in the top plug; insert the upper thrust washer;
lubricate the threads with 424HC2 anti-seize lu-
bricant (careful not to get any on the O-ring) and
screw the top plug into place. Then replace the
top cover and secure it with the four socket head
screws.