BIRD MARK 7 - CENTERBODY DISASSEMBLY

2.2 With a %e” allen wrench, remove socket
screw and washer, then puil off the Pressure
Compartment.
NOTE: Do not attempt to pry loose with a screwdriver.
Grasp the Pressure Compartment firmly and pull top
back at an angle to break the seal.
2.3 Remove “L” shaped compartment seal from
Centerbody (P/N 6813).
2.4 Using a %2” allen wrench, loosen the twe (2)
setscrews securing the Pressure Radius Arm to
the magnet, then remove the arm.
2.5 Remove the magnet from the Pressure Com-
partment by rotating the assembly in a
COUNTERCLOCKWISE direction.
3.0 CENTERBODY DISASSEMBLY
3.1 Remove all the tubing from both the Pressure
and Ambient sides of the Centerbody using
tube removal tool (P/N 6711).
Important: Retain the old tubing until a complete
examination for defects has been made, replace
if necessary.
3.2 Remove (4) compartment studs using à %e”
open end wrench or nut driver.
3.3 The venturi gate cage is hand tight and may
be removed by unscrewing in a COUNTER-
CLOCKWISE direction. Withdraw the venturi and
jet cage assembly from Centerbody. Inspect
and clean jet with stylet (P/N 0924), if occluded.
Caution: Use only stylet (P/N 0924) to clean the
jet orifice. Damage to the venturi jet orifice will
adversely affect the performance of the
respirator.
3.4. The SENSING/SERVO VENTURI is only
hand tight. Rernove by turning COUNTER:
CLOCKWISE. Use stylet (P/N 0924) to clean the
venturi orifice, located in Centerbody, if
occluded. Caution: Use only stylet (P/N 0924) to
clean the jet orifice. Damage to the jet orifice will
adversely affect the performance of the
respirator.
3.5 INSPIRATORY FLOWRATE contro!
disassembly.
a Using a %2” allen wrench, remove
INSPIRATORY FLOWRATE contro! knob.
@ With a %” open end wrench, remove FLOW-
RATE control valve and adapter from Center
body, being careful not to lose the small O-
ring on the end-of the valve.
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3.6 CONTROLLED EXPIRATORY TIME control
disassembly.
RE Using a %2" allen wrench, remove the
CONTROLLED EXPIRATORY TIME knob.
m Remove valve from Centerbody by loosen-
ing packing nut to allow a %” open end
wrench to gain access to vaive body, being
careful not to Jose the smalt O-ring seal on the
end of the valve.
3.7 Removal of the CONTROLLED EXPIRATORY
TIME CARTRIDGE is NOT advised, but a thor
ough disassembly of the internal components is
required.
m Using truarc pliers #1, remove external
retaining ring at back of CARTRIDGE, then
withdraw the CARTRIDGE cap, large
diaphragm an cam button.
m Use truarc pliers #1 to remove the small
internal retaining ring. This will expose the
remaining CARTRIDGE components.
3.8 Remove hand timer rod and related parts as
follows:
m Remove safety wire, then hand timer shaft
locknut with Y” open end wrench.
7
m Remove Pressure Compartment armature
plate and note O-ring bumper.
m With truarc pliers #1, remove large
diaphragm retaining ring on Ambient side of
Centerbody. This facilitates the removal of the
remaining components from the Centerbody.
8 Carefully withdraw the hand timer shaft,
sensitivity armature plate, diaphragm assem-
bly and spacer without disturbing the ceramic
spindle. .
3.9 Remove the ceramic switch as follows:
® Carefully remove the ceramic spindle from
- the bushing.
® With truarc pliers #1, remove retaining ring
in front of bushing on Pressure Compartment
side of Centerbody, then press out the
ceramic bushing from the Ambient side, using
special tool (P/N 0031). NEVER use any other
device for removal.
NOTE: All 3 O-rings on the ceramic bushing should be
removed from the Centerbody and discarded.
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