Thermo King X430 - Page 53

Unloader Head
(Rev.
7, 12/01)
Oisassembly
L Rcmove cylinder head from
body same as standard
2. Rcnove solenoid valve.
l. Remove check vnlve.
.r.
Remove unloder vahe.
NOTE:
ft mor bc nccessary to t^p wlws slightry to loosen
Repeir
l. I'rspect
solenoid
valve
for
physical
chrnge.
L Mc,sure resistance
ofcoilor check lbr ampemge.
l. With valve de-energized. flow will
be from Pon A to C
md none fron B
to C.
5.
To reassemble, revenc rh€
disassembly
pro{edure.
Wnh
valve
energized. flow will
be
frorn
B to C and A
NOTE: The valve i,
non-.epaimble.
In\pe(r checl
lrlvr
for
se:lj
on
sidrs.
If
wc.r
i\
prcsent.
valve must be replaced.
Inspect unloader
valve.
NOTE: It may be necessary to disassemblc vatve
assemhu to check sprins
and clean internrl
portion
of
piston.
To dkatsemble
pkton
fton
coyen derye.s pi:-
ton and rcnove nI
pin.
Cornpnss sping
and rcnnve
a. Inspect
piston
sides for wear
b. R€rnove ring, insen in(o bore. check end
g+
clenr-
ance. Cap must not exceed 0.016 in.
(0.1.06
nm).
c. Inspecl spring ends. cover rnd unloadcr piston
and
sleevc for wear
2. Port C
3. Port B
FiPurc 78:
Solenod
Uabe
Pods
42