Preventative Maintenance
Pump Rebuilding
Thermo Fisher Scientific
Model 42
i
Trace Level Instruction Manual
5-5
Use the following procedure to rebuild the pump (
Figure 5–2
). To replace
the pump, see “
Pump Replacement
” in the “
Servicing
” chapter.
Equipment Required:
Pump Repair Kit (two repair kits required per pump)
Allen Wrench, 3 mm and 4 mm
Wrench, 9/16-inch
Needlenose Pliers
Equipment Damage
Some internal components can be damaged by small
amounts of static electricity. A properly grounded antistatic wrist strap
must be worn while handling any internal component. For more
information about appropriate safety precautions, see the “
Servicing
”
chapter.
▲
1.
Turn instrument off, unplug the power cord, and disconnect the pump
plumbing from the instrument.
2.
Note the orientation of the pump head top plate for later reassembly.
Using a 3 mm Allen wrench, remove the eight socket head screws and
washers securing the pump head top plate.
3.
Discard the old Teflon gasket.
4.
Note the orientation of the diaphragm head for later reassembly.
Remove the diaphragm head. Using a 4 mm Allen wrench, remove the
four socket head screws securing the diaphragm head to the pump
body.
5.
Insert the tips of blunt needlenose pliers in the dimples of the clamping
disk, then loosen and remove the clamping disk.
6.
Remove and discard the old Teflon gasket.
7.
Insert the clamping disk into the new Teflon diaphragm (three pieces)
and screw the clamping disk into the pump. Do not over tighten.
Pump Rebuilding
