4700 Refrigerated Sampler Service Guide
Section 2 Sample Delivery System
2-6
2.3.2 Thumb Screw
If removal of the thumb screw is necessary, first unscrew the
thumb screw and lift the hinged half of the pump cover. Pry the
o-ring loose with a small flat screwdriver and then pull the shaft
out of the pump cover.
Figure 2-5
Thumb screw removal
2.3.3 Pump Housing Cover
and Band
To remove the pump housing cover and access the pump band,
first release the pump band by opening the latch. Remove the
four screws holding the cover in place.
CAUTION
The screw nearest the edge (Figure 2-6) must be reinstalled
with great care, as it is possible to strip the plastic threads.
This screw should always be the last to install.
Figure 2-6
Opening the pump housing cover and latch
CAUTION
When
reinstalling
all self-tapping screws, avoid destroying the
plastic threads. First, seat each screw in its hole and, without
pressing down, rotate the screw counter-clockwise until it falls
into its thread groove with a "click." Then tighten the screw.
This precaution is not necessary with new, unthreaded holes.
O-ring
4th
screw
Pump
latch
Key
groove
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