Grasso GRASSOSCREW GSL Series, Инструкция по эксплуатации

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/) '1pen 1he
suction stop va\ve and discharge s1op valve.
,,,nl'!Jrtm
seals f
Of
Ie aks.
-
� ........ l l
A
,AA
4-::---
1) ,1 t11e <X>mpt�SSOf \s 1med w1\h an 0COnomizer port, open
the economIzer stop valve.
m) Reconnect control cabinet to the electnc supply hr.e.
n) Operate the EVA manually
to
check 1ts operat,on as m
paragraph 4.14 lf the hmit switches do nol s1op the
motor at the mImmum or maximum pos1tion. the cams
musi oe reset as in paragraph 6
12
o) Reconnect the �1artor to the power supply
p) Star1 the compressor.
7 .8 CAPACITY CONTROL PILOT VAL VE ASSEMBL Y
(reler
to
figure 7 .4 on
pf�Vious
page}
1\) REMOVAL OF PIi OT VALVE ASSEMBLY
a) Carry out the shutaown procedure ln parag1aph 7 .3
b) Check that
the
capacny oontrol valve has returned to
the minimum or fully unloaded pos1t1on on :-.hut down
by e
)
(Wlllning the indicator plate on the end of the
eleclnc valve actu.itor Th1s moves the pilot valve as­
sembly away 1rom the end cover
(19),
whiçh is a re­
quIrement for step J) below
C) Loosén the rwo socket heao cap screws (4 rn figure
7 2) on each �lde of the actuator base plate and
remove the complete electric valVe actuator assem­
bly. The fle.xible electrical condurt should allow the
EVA to be moved out of the way without disconnect•
ing the condurt
d) Remove
the
3 cap
screws
(12)
from
seal
helder (
n ).
e) W1lhdraw the seaf helder, using care to prevent
scratching the O-ring on the shaH
f) Exam1ne the O-ring
tor
wear cracks and deforrnities and
' if necessary replace the O-rmg as In paragraph 7.7.
9
1
) Fit a strap or chain wrench around the end
cover c Ir ­
cumference
{19).
Il)
Turning the strap or cnaIn wrench
1n
the counter doek·
w1se dlrection, unscrew the end cover (19} trom the
capacIty control cyhnder
{3).
1> When the end cover is loose from the capacity control cy­
linder pull the end cover by hand away trom the com­
pressor. The pilot valve assembly (cons1sw19 of valve
pla1e (20), pilot valve (6), piston (.d) and baU nul (lO) rs
pulled loward the max,mum or fully toaded oos1hon in the
end of the hydraulic cylinder by the ball screw (wh1ch ,s
anached at one end lo the bal! nut and a1 the other eno
to the end cover}. Pull the end cover far enough tor ao
cess 10 the three shoulder screws
(21)
on the valve plate
(20) _or unt1I the
piston comes to a stop agams1 Ine retaln­
lng rin9 (24) attached 10 lhê
hydrauhc
cyliMer (?).
J) Remove the three shoulder screws (21) wIth an Allen
,
�renet,. using care nol to bend or damage the
pilot valve
6) connected to the valve plate {20).
ki WIth the valve plrue and ptlol valve
\oose trom tne pis­
ton. remove the end cover and ball screw
complete
vlilh the subassembly
of
valve plate. pilot valve and
4 and
locating plate (7) wJU re-
:a,n t>ehind m t:ne end
o, t11e
C'Al'I ��•
J) Remove tne O•Mg (23) trom the end cover
(B) DISASSE-MBL Y OF
PILOT VALVi:: ASSEMBLY
a)
Remove
the snap M9 {18)
b) Remove the baU screw (1) with anached beanng (17)
trom the end cover, Support the end cover on woeden
supports w
,
t h
Ine baJI screw hangIng down and tap
lhe end of a screwdriver inser1ed In10 the end slot of
tho ball
screw
c) Rernove
the
re1aIning snap ring (14) and support ring
(131 frorr the ball screw.
d) Renove the oeanng (17) from the ba.Il screw by sup­
pomng the outer race and hghtly hming the end of the
shaft
e) Remove me E-nngs (8) trom the p,lci valve (6)
f) Remove the pilot valve from the valve pla1e.
g) Remove tfle roll pin (9) from the valve plate.
h) lJnscrew the vafve plale trom the ball mrL
IMPORTANT
Do not attempt to unscrew the bal/ screw shaft trom the aal/
nut
1)
tr
1!
Is not required
10
remove the hydraulic cyhnder and
piston. proceed to (E) ne)(t page.
(C) REMOVAL OF t-lYDAAUUC CYUNDER & PISTON
a) Aemove the pilot valve assembly as rn (A) before.
b) Loosen the cyhnder (3) by turnIng 11 counterciockw1se
w,tn a strap wrench. Re move it carefully.
c) Aemove the shde nng (5) and back up O-nng (27)
from the piston (4)
d/ Remove the three screws (22) holding the locat1ng
plate (7) to the piston (4).
e) Remove the locat1ng plate.
f) Re move the lnternal retammg snap ring (24 ).
g) S1,de tne piston 01' the capacity control valve rod (2).
The piston rod sh1m (25) and lhe O-rrng (26) beh1nd
the retaining nng w1ll be pushed out by the piston
h) Remove the O-ring {28) trom lhe piston rod (2),
(D) INST ALLA TION OF HYDRAULIC CYLINDER & PISTON
a) Clean and inspeel all the parts and replace as riecess­
a,y. Fxam,ne the hydrauhc cylinder for any uneve­
ness m the sliding
surlace
b) Mount a new O-rmg (28} on the p1slon rod (2)
c)
Mount the p<ston (4) on the rod
92.01
Compressor Package GSLP
Page 7.5