Thermo Scientific 410i Instruction Manual page 151

Assembly with New
Diaphragm and Valve
Thermo Fisher Scientific
1. Place the parts removed in the previous step onto the threaded stud of
the new diaphragm. Carefully screw the new diaphragm into the
connecting rod. Secure the support cup and small parts onto the
diaphragm stud using a technique similar to that used during removal.
It is helpful to hold the connecting rod at a slight angle until the
threads are started. Spin the diaphragm on until it is snug, then lift and
grip the edges of the diaphragm at 7 and 2 o'clock and tighten firmly
using both hands. DO NOT use tools!
Tip: If the pump is loose and not mounted, position and hold the pump
with the motor shaft vertical when starting the threaded diaphragm stud
into the connecting rod. This helps to prevent the small parts from falling
off the stud.
2. Turn the fan until the diaphragm is flat across (mid-point of the
stroke). With the diaphragm centered over the compressor housing,
firmly seat the diaphragm edge into the compressor housing groove.
3. Place the clean bottom plate onto the compressor housing using the
reference mark made earlier to ensure the correct orientation. Then
place the new flapper on top of the intermediate plate.
4. Place the clean top plate on top of the bottom plate using the reference
mark made earlier to ensure the correct orientation. Tighten the four
top plate screws snugly in a diagonal pattern and then tighten to a
maximum torque of 6-7 inch-lbs. Turn the fan by hand to confirm that
the pump turns freely.
5. Replace the compressor housing cover and gasket. Install the four cover
screws. No not over-tighten.
Preventive Maintenance
Pump Rebuilding
Model 410i Instruction Manual 5-9