4700 Refrigerated Sampler Service Guide
Section 2 Sample Delivery System
2-12
2.3.7 Motor Replacement
When installing the motor and plate assembly, attach the plate
to the base using the original four holes to insert the mounting
screws (see Figures 2-13 and 2-15). The unused holes should only
be used if the original threaded holes are damaged.
Tighten the screws to 20 - 28 in/lbs.
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.
Figure 2-15 Motor plate: mounting holes
Wiring assembly
The motor wiring harness is easily replaceable.
1. Disconnect the two wires from the motor terminals. Older
pump harnesses may have spade connectors that pull off;
newer pump harnesses are soldered to the motor termi-
nals.
2. When installing the new harness, match the red wire to
the red terminal and the black wire to the black terminal.
3. Route the wires so that the ferrite bead is on top of the
motor (refer to Figure 2-16).
4. Clamp all four wiring harnesses to the motor body with a
cable tie.
Original
mounting holes
Spare
mounting
holes (3)
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