1. Freezing indicates poor flow suggesting a replacement of the pump membrane and/or dryer.
2. Order the appropriate replacement parts from Bruker-AXS.
3. The upper unit is the control box and the lower unit is the pump box. Label all hoses and cables.
4. Turn off the Kryoflex control program.
5. Switch off the control box.
6. Shut off the silver feeder Dewar valve.
7. Undo and remove the collar clamp.
8. Pull out the transfer line from the white Dewar.
9. Cap the white Dewar.
10. Locate the nitrogen shunt in the diffractometer utility drawer.
11. Attach shield gas hose to shunt.
12. Switch the connectors on the heat exchanger with matching ones on the shunt.
13. Leave shield gas on to purge system for at least an hour.
14. Shut off shield gas.
15. Unplug the control and pump boxes.
16. Disconnect hoses and cables. Remove control box and set aside.
17. Remove pump box.
18. Remove pump box cover. Note the clamps holding the black dryer cartridge.
19. Remove bolts on the pump and lift top off.
20. The pump top has two layers. Gently pry them apart.
21. Note the pattern left by the gasket on the topmost layer of the pump top.
22. Clean both layers of the the pump top and replace the gasket. Reassemble the pump top.
23. Undo the center screw and remove the membrane assembly.
24. Put the membrane assembly on a working surface.
25. Notice the grooved side on the washer or spacer on the pump piston is facing up.
26. Disassembled membrane assembly with parts from bottom to top arranged from left to right.
27. Note the orientation of the black bottom membrane and replace.
28 Remove metal parts from the foam disk.
29. Replace foam disk and clean metal parts.
30. Clean metal parts and replace the top black membrane.
 
31. Reassemble pump using the disassembly photos 18-31 as a guide.
33. Reassemble pump box.
34. Insert pump box and control boxes into the diffractometer housing. See 16-18.
35. Reattach all cables and hoses. See 3.
36. Turn on shield gas. See 13.
37. Remove the shunt and reattach heat exchanger hoses. See 10-12.
38. Reinsert transfer line into white Dewar. See 7-9.
39. Turn on silver feeder Dewar valve. See 6.
40. Plug in pump and control boxes. See 15.
41. Switch on controller. See 5.
42. Run the Kryoflex program and click on “refill” and “start”. See 4.
32. Remove clamps, note the gas flow arrow on cartridge, replace cartridge.