Instruction manual

41
High Throughput Diffusion Pumps
DRAFT 12/23/04
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.
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.
8. Follow steps 1 through 5 in reverse order.
Figure 27 Jet Coupling Detail
NOTE Jet spacings are preset at the factory and
controlled by the spacers secured to the
respective stages.
NOTE If the jet coupling loosens from the jet
rod during disassembly, position it so
that the top of the jet coupling is flush
with the bottom orifice plug (Figure 27).
Jam Nut
Jet Rod
Jet Coupling
Cold Cap
Top Jet
Orifice Plug
Cold Cap
Detail A
Securing Screw
Assembly
Location of Jet Coupling
prior to assembling Jet Cap.