g) For cam readjustrnent(s) refer to paragraph 6.1� steps
e to p. In the event that the cam readjustment-proce
dure does not give the necessaty travel control, the
rnicro-adjustment
cam
has to be repositioned as
given in step h) after procedure step 1) in para. 6.12.
h) To set travel by adjusting swîtch plate (refer to fig. 7.3):
- Loosen pivot and micro-adjustment screw.
- In the event of actuator under-travel, rotate micro
adjustment cam to swing switch outward trom the cam
post.
-
In the event of actuator over-travel. swing switch into
the cam post.
-
Tighten pivot and micro-adjustrnent screw.
- Proceed to procedure step rn) to p) in para 6.12
7.7 CAPACITY CONTROL SHAFT SEAL SERVlèlNG
(refer to figure 7.4)
REMOVAL
a} Carry out the shut down procedure in paragraph 7.3,
b) Loosen the two socket head cap screws (4 in fig. 7.2)
and remove the complete electric valve actuator as
sembly. The flexible electrical conduit should al(ow
the EVA to be moved out of the way without discon
necting the conduiL
c) Remove the three cap screws (12) trom the seal
holder (11 ).
12 11
10
15
16
17
18
9
a
7
6
s
4
3
2
1
d)
Withdraw the seal holder, Using care to prevent
scratching the O-ring on the shaft.
e) Remove the two seals (15} frorn the seal helder.
f) Examine the seal for wear. cracks and deformities in the
O-ring.
INSTALLATION
a) Remove any burrs trom the seal ho/der.
b) Smear thread sealer on the outside diameters of the
seals to prevent leal<age. Be sure to place the seals
back to back as shown in figure 7.4 so they will seal
against either a poSitlve pressure
or
a vacuum. Press
the new seals into the seal helder using care not to
deform or bend the seals.
c) Check to see that the shaft is clean and free trom
burrs to prevent damage to the seals.
d) Replace the O-ring (16} in the seal helder groeve.
e) Mount the seaJ helder over the shaft and push it into
place, taking
care
not to damage the O-ring.
f) Tighten the three cap screws (12).
g) Mount the electric valve actuator using care to align
the pin in the aciuator shaft wîth the slot in the end of
the ball screw shaft.
h) lnstall the two socket head cap screws (4 in fig. 7.2) to
secure the EVA assernbly to the compressor.
î) Close the pressure safety valve.
19
20
21
22
23
24
25
26
27
28
29
FIG. 7.4 CAPACITY CONTROL PILOT VAL VE ASSEMBL Y
Page7.4
Compressor Package GSLP
92.01
