A735-01-840 Issue B
Page 8
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Gas ballast adaptor
Ensure the pump is switched off before fitting.
As a precaution, Edwards recommends that a complete a vacuum leak check be performed after this installation.
Tip:
Ensure the cooling fan operates correctly following the installation of the gas ballast adaptor.
Retain the gas ballast control assembly and seat for future use if required.
1. Undo the 2 off retaining bolts and partially
remove the fan cowl.
Caution:
Cooling fan supply lead attached.
2. Carefully disconnect the cooling fan electrical supply lead
and remove the fan cowl.
3. Using a 21 mm AF spanner, remove the gas
ballast control assembly.
4. Carefully remove the gas ballast control seat and O-ring.
5. Assemble the gas ballast adaptor and new
O-ring, ensure the O-ring and seal surface
are clean and free of dust or dirt.
6. Reconnect and assemble the cooling fan supply lead and fan
cowl (1) in reverse order. Torque the retaining bolts (2) to
3 Nm.