Agilent Technologies HS-16 User Manual page 67

Technical Information
To disassemble the jet assembly:
1 Remove the cold cap or halo baffle as described in "Cold Cap".
2 Unscrew the jet cap from the coupling assembly.
3 Remove the orifice plug.
4 Withdraw the central tube complete with the second stage jet and jet shield.
5 Remove the lower jet assembly from the pump, which consists of the third
stage jet, the jet shield, the fourth stage jet, and the jet base.
6 Remove the third stage shield from the lower jet assembly.
Before removing the securing screws in the following step, scribe a reference
NOTE
mark at the interface to assure that original holes are mated when reassembled.
7 Remove the securing screws between the third and fourth stage jets. Carefully
preserve the screws. Be sure that the jet spacers are not damaged in handling.
8 Remove the fourth stage jet from the jet base.
9 Clean all parts thoroughly.
To reassemble the jet assembly:
1 Replace the fourth stage jet on the jet base.
2 Replace and tighten the securing screws between the fourth stage and the jet
base uniformly and in a cyclical pattern.
Jet spacings are preset at the factory and controlled by the spacers secured to the
NOTE
respective stages.
3 Replace the third stage jet on the fourth stage.
4 Replace and tighten the securing screws between the third stage and fourth
stage uniformly and in a cyclical pattern.
5 Replace the third stage jet shield.
6 Install the lower jet assembly in the pump.
7 Check that the lower jet assembly is firmly seated on the pump with the ejector
correctly positioned. For proper alignment, a pin is provided in the base of the
pump; the large slot in the jet base must register on this pin.
High Throughput Diffusion Pumps User Manual 67