Page 290 (Model J)
34.2 Modification A as per SI120401 - (Bypassing of oxygen volume chamber).
This is the standalone instruction for modification A.
The output of the oxygen pressure regulator is currently connected to the oxygen volume
chamber. The modification will bypass the oxygen volume chamber and connect the output
of the pressure regulator directly to the oxygen input of the blender. This should significantly
reduce the gas exhaust sound.
Use the instructions in the appropriate service manual to gain access to the pneumatic unit.
When the pneumatic unit is visible, locate the oxygen regulator to volume chamber tube
(highlighted in green) and the oxygen volume chamber to blender tube (highlighted in red).
Disconnect the oxygen supply tube from the volume chamber and trim 10mm from the free
end.
Discard the oxygen volume chamber to blender tube.
Connect the oxygen supply tube (highlighted in green) to the blender inlet.
Connect trimmed tube to
blender inlet
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