cl) lnstall a new 0-rîng (26), piston rod shim (25) and re
tairnng ring
(24).
(;]j
Mount the
piston
locating
plate (7)
on the piston wrlh
the roll pin (29} in the end slot at the bottom of the pis
ton rod.
f) lnstall and tighten the three screws (22) holding the locat
ing plate to the piston. Use Loct1te 242 on the screw
threads.
g) Mount a new O-nng (27) and slide nng (5)
on
the p,s�
ton.
lightly oil the O-ring and adjacent surfa
c
es
.
h) On GSL 165, 180 and 240 compressors only, 1nstall a
new O-nng on the cylinder (3). L1ghtly 011 the O
-
ring
.
i) Screw the cyhnder (3) inlo place using care nor to
scratch
or
cut the slJde nng (5).
(E) ASSEMBL Y OF PILOT VAL VE.
a) Clean and examine the ball screw (1) for wear (1nclud-
1ng the end slot) and if necessary replace both the
bal! screw and balt nut ( 1 O)
b) Clean and examine the remaining parts and replace
as necessary.
c) Screw the vaJve plate (20) onto the balt nut (10).
d) Dril! a hole 3/16 inch ,n diameter, 6
mm
(1/4 inch)
deep in the valve plate adjacent to the ball nut and in
sert a roll pin (9) to prevent the hall nut rotating and
unscrewing frorn the valve plate.
e) Mount the pilot valve (6) ïn the valve plate.
f) Secure the pilot vatve wlth E-rings {8) on either side of
the valve plate.
g} lnstall the beanng (17) on the ball screw shaft. A llght
press is required on the bearing inner race.
h) Loek the bear1119 on the shaft with a support ring (13)
and a retaining snap ring (14).
1) lnstall the beanng 1nto the end cover (19) with a light
press fit.
J) Secure the bearing W1lh the retainrng snap ring (18).
(F) INSTALLATION OF PILOT VALVE ASSEMBLY
a) Mount a new O-nng (23) on the end cover (19).
b) lnsert the pilot valve (6) through the locating plate (7)
mto its bore in the piston and mount the valve ptate to
the piston.
c) lnstall the three shoulder screws (21 ), usIn9 care riot
to bend or damage the pilot valve (6). Use Loctlte 242
on the screw threads.
d) Screw the end cover 1nto the hydraulic cylinder.
e) Tîghten the end cover With a bar between the two 3/8
inch · 16 UCN 50 mm (2 inc:h) lono screw,; in,:,.i:,rl�rl
into the tapped holes for the cap screws (12). Use
care not to darnage the oall screw shaft.
f) Mount the seal cover (11) complete with the two back to
bad( seaJs (15) and the O-nng (16) as in paragraph 7 .7.
g) Mount the electric va!ve actuator using care to align
\he pin in the coupling w,th the slot ,n the end of tho
ba// screw shaft.
h) lnstalt the two socket head cap screws {4 in fig. 7.3).
i) Jumper the low oil pressure swîtch.
j)
Connect the control cabîne1 to the electric supply line.
k) With the main motor power disconnected, and the con
trol cab1nel energ,zed to s,mulate operat1ons, check
the electric valve actuator switch settings as in para
graph 4_ 14.
1) Remove the jumper from the low 01! pressure sw11ch.
m) Close the pressure safety valve
n) Open the suct1on swp valve and d1scharge stop valve.
o) lf the compressor 1s firted w1th an econornizer port,
open the economtzer slop vatve.
p) Reconnect conlrol cabinel to the electnc suppty line.
q) Reconnect the starter to the electric supply line.
r) Start the compressor.
7.9 ROTOR END PLAY INSPECTION
The condition of the thrust bearings can be determîned by a
simpte measurement of the rotor end play. A predeterm1ned
force is apphed to the end of the shaf1 and the axial move
ment of the shaft is measured.
(B
-
FIG.
7.5
MEASUREMENT OF ROTOR END PLAY
-
.
Page 7.6
Compressor Package GSLP
92.01
