Figure 5-2. Rebuilding The Pump - Thermo Scientific 43i Instruction Manual

Thermo Fisher Scientific
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground antistatic wrist strap must
be worn while handling any internal component.
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Loosen the fittings and remove both lines going to the pump.
3. Remove the four screws from the top plate, remove top plate, flapper
valve, and the bottom plate (Figure 5–2).
4. Remove the screw the securing the diaphragm to piston and remove
diaphragm.
5. Assemble the pump by following the previous steps in reverse, make
sure the Teflon® (white) side of the diaphragm is facing up and that the
flapper valves cover the holes of the top and bottom plate.
Figure 5–2. Rebuilding the Pump
Top Plate
Flapper Plate
Bottom Plate
Diaphragm
Model 43i Trace Level-Enhanced Instruction Manual
Preventive Maintenance
Pump Rebuilding
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5-7