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Carrier SUPRA 750Mt - Engine Air Cleaner; Figure 4-4 Electric Fuel Pump

Carrier SUPRA 750Mt
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4-6
a.
Single coil solenoid -
- for
Supra 950
Mt
Coil is energized when
speed relay is energized.
Dur
ingstartsequen
cehold
coi
l
is
ener
giz
ed.When
sta
rte
r
is
enga
ged
pul
l
coi
l
is
ene
rgi
zed. After
engine start (max 10s) -- stater disengaged -- pull
coil is de-energized. Hold coil is kept energized.
b.
Dual coil solenoid -
-
for Supra 750/85
0Mt
Solenoid is composed of two coils :
-
-
Pull
coil
: high force used to move the plunger
-
-
 Ho
ld
coil
:
lo
we
r
co
ns
um
pti
on
-
lo
w
for
ce
us
ed
to
maintain the plunger/lever in its position.
When spee
d relay i
s energi
zed,
pull
and hold co
il
are
ene
rgi
zed.Afterless
tha
n
1s
thepullcoil
tim
ermodul
e
de-energized the pull coil, hold coil maintained ener-
gized.
Pull coil
timer module
PCTM
Coil is energized when run
relay is energized.
Current
draw
'
8 amps
4.
3.
5
En
gi
ne
ai
r
cl
ea
ne
r
a.
Inspect
ion
The
oil
typeair
cle
ane
r,
hos
e
and
con
nec
tio
ns
sho
uld
be
in
sp
ec
ted
for
le
ak
s
or frac
tur
es
in the
in
le
t
an
d
ou
tle
t
hoses. A damaged air cleaner or hose can seriously
affe
ct the perfor
man
ce
and lif
e
of the
eng
ine
. If
hou
sin
g
has been dented or damaged, check all connections
immediately.
b.
Serv
ice Proce
dure (dry type)
Stop engine, remove air filter. Install new air filter.
4.
3.
6
Se
rv
ic
in
g
fu
el
pu
mp
a.
T
o check or
to repla
ce
1.
Remov
e 3 screws from cove
r (item 1, Figure 4-4).
2.
Remov
e cover
, gasket and filte
r.
3.
Was
h filter in cleanin
g solvent and blo
w out with air
pressure. Clean cover.
WARNING
Pr
ot
ec
t
ca
re
fu
ll
y
yo
ur
ey
es
fr
om
solvent.
4.
T
o install rever
se above steps
.
1.
Fu
el
pu
mp
2.
Fi
lt
er
3.
Ga
ske
t
4.
Co
ve
r
4.
3.
2.
1.
Figure 4-4
Elect
ric fuel pum
p
b.
Ve
rify fuel pump ca
pability
1.
Rem
ove fuel pump from the system
.
Con
nec
t
the
manom
eter to pump ou
tlet. Energi
ze
fuel pum
p
with
2.
At zero f
low
, the fue
l
pum
p sho
uld
pro
vid
e abo
ut
0.7
bars of pressure at the pump outlet.
3.
Whe
n
run
nin
g
corr
ectl
y
the fuel
pum
p
gen
era
tes
noise according to pulsation of the inner piston.

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