
REPLACEMENT PROCEDURES (continued)
NM2B
4.19.10 Carefully cut the tie strap and remove the other end of the large hose
at the top of the muffler interface wall.
4.19.11 Remove the three socket head screws securing the bellows top plate
to the bellows box.
4.19.12 Carefully cut the tie strap at the intake port (rear of valve) and
remove the large hose.
4.19.13 Disconnect the small diameter tubing from the hose barb on the
bottom of the miniature actuator.
4.19.14 Remove the screws holding the monitor box to the ventilator box.
WARNING:
Two people are required to perform the remaining
portion of the procedure.
4.19.15 Raise the front of the monitor box chassis approximately four inches,
and prop the box open.
WARNING:
Ensure that AC power is removed from the
machine before raising the monitor box. Failure to
observe this precaution may cause injury by
electric shock.
4.19.16 Disconnect the compression fitting at the outboard end of the copper
tube from the valve case assembly, and remove the valve case
assembly.
4.19.17 Carefully position the replacement valve case assembly in the bellows
box, with the copper tube extending up into the ventilator box, and
connect the compression fitting in the ventilator box.
4.19.18 Connect the small diameter tubing to the hose barb on the bottom of
the miniature actuator and secure the connection with a press-on
clamp.
4.19.19 Attach the large hose to the intake port of the new valve case
assembly and secure it with a new tie strap.
4.19.20 Secure the valve case assembly to the bellows top plate with the four
screws that were previously removed. Be sure that the two O-rings
in the bellows top plate are properly seated.
4.19.21 Secure the bellows top plate to the bellows box using the three screws
that were previously removed.
Rev. A
4-62
Содержание Narkomed 2B
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