Apeks Flight Manual page 4

Separating the din handwheel Assembly.
6. using a 22mm deep socket, fix the handwheel into a vice.
using a 6mm Allen Key/hex wrench, loosen the din Bolt
(24) and remove both o-rings.
7. remove the din Filter (23) from the din Connector (21).
to do this, first try to remove the filter by gently tapping the
connector on a flat surface at the end face. the filter should
start to ease out.
8. if necessary, insert an o-ring pick through the legs of
the balance chamber, not the centre, to gently push out
the filter. the filter must be kept square to the face of the
connector as it is removed otherwise it will jam inside.
9. remove the o-ring (18), using the hooked end of the At79
o ring pick. push it through the center of the o ring and
gently pull out.
note: When servicing flight regulators it is good practice to
follow the sequence of operations stated below:
1) Strip down both the 1st stage and 2nd stage
2) Clean and inspect all regulator parts as laid out in the
procedures in both manuals.
3) reassemble the 2nd stage (but do not adjust or set)
4) reassemble and set the 1st stage (following procedures as laid
out in the 1st stage manual)
5) Set the 2nd stage (following procedures as laid out in the
manual).
the reason for leaving the 2nd stage before setting is to allow
the seating area to "seat and bed in" better, therefore optimising
performance and adjustment.
FLIGHT First Stage Regulator Maintenance Manual
removal of yoKe Connection.
10. remove the plastic Clip (30). unscrew the yoke Knob (35)
from the yoke Clamp (31). the handwheel hex Axle (36)
can then be removed, by continuing to unscrew the yoke
knob. Slide the yoke Knob laterally on the solid internal
side, to remove the knob.
11. Separate the dust Cap (33) from the yoke Knob (35).
remove the o-ring (34) from the inside of the dust Cap
(33).
12. With the Flight First Stage secured in a vice using the work
handle tool (pn At48), fit the yoke connector tool (pn
At74) and a long 6mm allen/hex socket. unscrew the yoke
Connector (27) and separate from the yoke Clamp (31) .
the body can then be removed from the vice.
6
Separation of the Balance Chamber / yoke Connector
13. the hp valve (16) and Spring (17) can be separated from
the yoke Connector (27). remove both 'o'rings. using a
pair of internal Circlip removal pliers, remove the Circlip
(29) and take the disc filter (28).
removal of the Composite diaphragm Clamp.
14. remove the hood (15) from the 1st Stage body. using the
work handle tool fit the 1st Stage into a vice. using the
diaphragm clamp tool pn At71 and a 3/8" drive socket
wrench carefully unscrew the Composite diaphragm clamp
in a counter clock wise direction (4).
CAution: the diaphragm Clamp tool (At71)
has three node points that engage on the Composite
diaphragm Clamp (4). ensure that these nodes are
correctly aligned into the Composite diaphragm
Clamp (4) and that steady pressure is aplied to the
top of the tool whilst slowly unscrewing, ensure that
socket, tool and wrench are square at all times.
FLIGHT First Stage Regulator Maintenance Manual
15. remove the Large Mp Spring (2) and rubber ring (5). Also
remove the Large Spring carrier (3).
note:
the rubber ring (5) is no longer used and can be
discarded when re-assembling.
16. replace three of the Mp blanking plugs (no o rings
required) and screw them in finger tight. put the nozzle
of a compressed air blow gun in the remaining Mp port
and blow a sharp blast of air to remove the diaphragm (6).
remove the Splitter (7), and then the valve Lifter (8). note
the balance chamber on one side of the valve Lifter shaft
and check to make sure that the shaft is not bent in any way.
remove the blanking plugs.
note:
take care when removing the diaphragm (6) so as
not to damage the seating face of the Flight Body (9).
17. unscrew the Large Spring Adjuster (1) from the Composite
diaphragm Clamp (4).
7