18
60
52
D2AMODULE
lTA-4.15
Figure 5-3. Module, Side View (D2A
Pump
Model
Shown)
C-2
CAUTION:
IF A
PULLER
IS
USED
TO
REMOVE
THE
COUPLING (37),
BE
CAREFUL
TO
AVOID
DAMAG-
ING
THE
CENTRIFUGAL
SWITCH (39).
Using a
small screwdriver, loosen
the
setscrew
that
secures
the
coupling
(37)
to
the
shaft.
Pull
the
coupling
off
of
the
shaft
(see Figure 5-3).
C-3 Using small diagonal
cutting
pliers, pull
the
coupling
key
(38)
from
the
slot
in
the
shaft
(see Figure 5-4).
C-4 Using
snap
ring pliers,
remove
the
retainer
ring (40)
from
the
shaft
(see Figure 5-4).
C-5
NOTE:
For
use
during
reassembly,
the
centrifugal
switch
end
with
the
split
halves faces
the
coupling
(37).
For
the
D2A,
D4A, D8A,
and
D16A
models
only,
loosen
the
one
or
two
setscrews
that
secure
the
centrifugal
switch (39)
to
the
coupling
(37) (see Figure 5-3).
For
the
D30A,
D60A,
and
D90A
pump
models
only,
loosen
the
setscrew(s)
to
remove
the
centrifugal
switch
(39)
from
the
shaft
rather
than
from
the
coupling
(37).
C-6 Using a phillips screwdriver, unscrew
and
remove
the
two
screws
that
attach
the
lever
to
the
front
end
When removing
the
lever (41),
hold
its
opposite
end
down
to
avoid losing
the
spring (42)
from
the
penetration
in
the
front
end
plate
(44). Remove
the
lever (41)
and
spring (42)
from
the
plate
(44) (see Figure 5-4).
C-7 Using a small screwdriver, remove
the
retainer
disk (71)
from
the
slot
in
the
air
inlet
(69)
tube
(see Figure 5-4).
C-8
CAUTION:
FAILURE
TO
HOLD
THE
DRIFT
PIN (or
bolt)
STRAIGHT
WHEN
DRIVING
THE
CYLINDRI-
CAL PINS COULD
RESULT
IN
DAMAGE
TO
THE
MODULE HOUSING.
Using a
hammer
and
a
drift
pin (or long
bolt).
remove
the
cylindrical pins as follows (see Figure 5-5).
a. Drive
one
of
the
two
short
cylindrical pins (64)
that
aligns
'the
rear
end
plate
(60) and
the
high
vacuum
stage
pump
cylinder
(55)
toward
the
center
bearing (52) until
the
pin (64) falls
out.
NOTE:
On
some
pump
models, this pin (64)
does
not
have
room
to
fall
out.
In
this
case, con-
tinue
driving it until
all
three
pins fall
out
of
the
alignment
hole in
the
front
end
plate
(44).
b.
While keeping
the
drift
pin (or bolt) inserted
through
the
rear-end-plate
alignment
hole, drive
the
long cylindrical pin (65)
toward
the
front
end
plate
(44).
Continue
driving
the
cylindrical pins
TRIVAC "A" Manual, Edition L
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