6100CR Refrigerated Sampler - Isco

6100CR Refrigerated Sampler
Section 4 Maintenance and Special Features
2. The needle assembly consists of the needle, a heavy coil
spring, three long slide rods, and four plastic rings. The
plastic rings are knurled (lines on their surface). These
rings are the needle mounts.
3. To remove the needle assembly, loosen the guide nut, the
top gray plastic nut in the middle of the assembly.
4. Remove the drain hose from the bottom of the assembly.
5. Push up on the ball on the lower end of the needle assembly
to compress the ball and remove the top remaining nut.
Note
There is spring pressure on the assembly forcing it down. Hold
the assembly up while removing the nut, then release slowly to
prevent damage to the needle assembly.
When pressure is released, disconnect the sample tube
from the top of the needle and remove the assembly from
the tower.
6. Remove the needle from the assembly by removing the
three screws holding the guide rods to the needle on the
bottom. DO NOT loosen the retaining nuts on the top end
of the slide rods. Pliers may be required to hold the slide
rods while removing the screws. Remove the slide rods and
unscrew the needle from the top needle mount, then
remove the guide and spring.
7. Reassemble in the reverse order. Make sure the needle
assembly is seated against the top mount before tightening
the nut. Align the drain tube fitting with the hose slot and
make sure the slide rods are not twisted. Tighten the gray
guide nut in the middle of the needle assembly until it contacts
the mount. The assembly should still be able to move
with light pressure applied to it.
Note
When reassembling the needle and tower, do not use tools to
tighten the plastic mounting rings. You only need to finger-tighten
them. You can use pliers to tighten the needle into
the top mounting ring, but do not apply excessive force.
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