Teledyne 4700, Serivce Manual

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4700 Refrigerated Sampler Service Guide
Section 2 Sample Delivery System
2-11
2.3.6 Pump Motor and
Wiring
1. Free the motor from the module’s wiring by cutting the
plastic cable tie.
2. Remove the nut and optical disk from the pump shaft.
3. Remove the four large Phillips screws holding the motor
plate on the base.
Figure 2-13 Removing pump motor assembly
4. Remove the four large Phillips screws that mount the
motor to the plate. Do not remove the motor gear from the
motor shaft. Replace as an assembly.
The brass idler gear bushing engages with the idler gear shaft.
When seating the idler gear, first lubricate its shaft with grease.
The black plastic bushing (also known as the thrust bushing)
normally rests on the shaft of the drive gear, acting as a spacer
(see Figure 2-14). If replacing one or both of the bushings, ensure
that the bushing flanges rest on the motor gear side (bottom) of
the plate (Figure 2-12).
Figure 2-14 Idler and drive gears
Cut tie
Remove
screws (4)
Idler gear
Drive gear with
thrust bushing