120 5977B Series MSD Troubleshooting and Maintenance Manual
4 General Maintenance
To Replace the DP Fluid
Materials needed
• Aluminum foil, clean
• Cloths, clean, lint-free (05980-60051)
• Container for old DP fluid
• DP fluid, 18.5 mL (6040-0809) – Two bottles are required
• Gloves
• Oil- and solvent-resistant
• Thermally insulated
Procedure
1 Remove the DP from the MSD. (See “To Remove the DP” on page 118.)
Remove the O-ring assembly from the top of the DP.
2 Cover the top of the DP with aluminum foil (shiny side up).
3 Heat the DP at 60 °C for 15 minutes. (For 7820A or 7890 GC’s you can use
the GC oven.)
4 Pour the old DP fluid out the top of the pump. Even after heating, the
pump fluid pours very slowly.
5 Check the color of the pump fluid.
The pump and pump fluid will be hot. Wear protective gloves when you remove the
pump from the oven.
Treat the old pump fluid as hazardous. It may contain traces of toxic chemicals.
Methylene chloride is a hazardous solvent. Work in a fume hood and take all
appropriate precautions.
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