HP 5973 - To Remove the Diffusion Pump

114
4 Maintaining the MSD
To remove the diffusion pump
To remove the diffusion pump
Materials needed: Aluminum foil, clean
Gloves, oil-resistant
1 Vent the MSD (page 52).
2 Separate the MSD from the GC (page 112).
3 Disconnect the foreline gauge assembly from the diffusion pump outlet.
The foreline gauge cable can be disconnected or can remain connected to the fore-
line gauge. Place the O-ring assembly on clean aluminum foil.
4 Disconnect the diffusion pump temperature sensor wires from the wiring
harness.
These are on the side of the diffusion pump not shown in the illustration.
5 Disconnect high vacuum power (
HIVAC POWER) cable from the back panel of
the MSD.
This is the thick black cable that emerges near the bottom of the pump.
6 Support the diffusion pump with one hand.
7 Remove the KF50 clamp.
8 Lower the diffusion pump.
9 Remove the O-ring assembly from the top of the diffusion pump.
The O-ring will have diffusion pump fluid on it and will be very sticky. Place the
O-ring on clean aluminum foil to avoid contaminating your lab bench and to avoid
having the O-ring pick up dust and dirt.
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