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3700 Portable Samplers
Section 5 Routine Maintenance
5.3.2 Removing the Pump
Tubing
5-4
Pump may actuate without warning. To avoid injury,
sampler must be off when pump housing cover is removed
for inspection or tubing replacement.
The amount of tubing (13.5 inches) used in the pump is less than
half of the total length of the pump tube (42 inches). In some
cases, when the tube has not been damaged to the point of
leaking, the tube can be used twice by simply turning it around.
Note
The black bands used to assist you in correctly positioning the
tubing in the pump and detector are placed on one end only. If
you turn the tubing around, you be unable to use the bands for
reference.
To remove the tubing:
1. Disconnect power from the unit.
2. Separate the center section from the remainder of the sam-
pler (as described in Assembly and Disassembly of the
Case, Section 2.1), and turn the center section over, as
shown in Figure 5-1.
3. Unscrew the distributor-arm retaining nut, indicated in
Figure 5-1, and pull the arm off the distributor shaft. Do
not manually rotate the distributor arm.
Do not attempt to manually rotate the distributor arm. Severe
damage to the distributor drive mechanism may result.
4. Pull the pump tube out of the distributor arm and
coil-spring assembly.
5. Turn the center section back over, and pull the tube out of
the pump tube port, indicated in Figure 5-1.
6. Detach the outer case of the liquid detector by loosening
the two captive thumbscrews as shown in Figure 5-2. Pull
the tubing away from the detector.
7. Remove the outer pump lid by loosening the four captive
thumbscrews indicated in Figure 5-2. This will expose the
pump tubing which is squeezed between the pump rollers
and the curved surface of the inner pump lid as shown in
Figure 5-3.
8. Extract the tubing from the pump. The pump rollers can be
rotated manually to facilitate the removal of the tubing.
After the tubing is removed, clean the interior of the pump
case thoroughly.
9. Remove the suction line, if attached, as described in the
section Replacement of Suction Line.
WARNING
CAUTION
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