6-7
6-7
TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
is released, the
is released, the
circuit will open.
circuit will open.
This switch
This switch
is
is
checked like an On-Off switch with the exception
checked like an On-Off switch with the exception
that the switch must be held closed to complete
that the switch must be held closed to complete
resistance checks.
resistance checks.
Solenoids.
Solenoids.
A solenoid is
A solenoid is
an electrical compo-
an electrical compo-
nent.
nent.
When electricity
When electricity
is applied to
is applied to
the coil, t
the coil, t
he
he
solenoid will
solenoid will
form an
form an
electromagnet.
electromagnet.
The magnet-
The magnet-
ic field will pull or push an armature into the coil
ic field will pull or push an armature into the coil
(based on application).
(based on application).
The armature
The armature
can be c
can be c
on-
on-
nected to a switch in electrical circuits to turn the
nected to a switch in electrical circuits to turn the
switch on or of
switch on or of
f.
f.
An armature can also
An armature can also
be used to
be used to
open or close valves.
open or close valves.
Solenoids employed as electrical switches can be
Solenoids employed as electrical switches can be
troubleshot with an ohmm
troubleshot with an ohmm
eter.
eter.
Remove the
Remove the
two
two
wires from the two larger posts of the solenoid.
wires from the two larger posts of the solenoid.
Energize the solenoid.
Energize the solenoid.
With an ohm
With an ohm
meter
meter
, check
, check
the resistance
the resistance
between the
between the
two larger
two larger
posts.
posts.
The
The
ohmmeter should indicate between 0 - 40 ohms
ohmmeter should indicate between 0 - 40 ohms
nominally.
nominally.
Solenoids employed as hydraulic switches are
Solenoids employed as hydraulic switches are
used to
used to
open and close
open and close
spools of
spools of
valves.
valves.
The
The
g
g
readings should indicate a higher ohm resistance
readings should indicate a higher ohm resistance
in one direction opposed to the other direction
in one direction opposed to the other direction
because the current generated by the ohmmeter
because the current generated by the ohmmeter
is sufficient enough to forward-bias the diode.
is sufficient enough to forward-bias the diode.
C
C
a
a
t
t
h
h
o
o
d
d
e
e
A
A
n
n
o
o
d
d
e
e
Current Flow
Current Flow
Illustration
Illustration
6-5.
6-5.
Diode
Diode
Refer to Illustrations 6-6 and 1-6 for component reference
Refer to Illustrations 6-6 and 1-6 for component reference
C
C
o
o
m
m
p
p
o
o
n
n
e
e
n
n
t
t
P
P
r
r
o
o
b
b
l
l
e
e
m
m
C
C
o
o
r
r
r
r
e
e
c
c
t
t
i
i
o
o
n
n
1
1
.
.
B
B
a
a
t
t
t
t
e
e
r
r
y
y
1
1
. L
. L
o
o
w
w
v
v
o
o
l
l
t
t
a
a
g
g
e
e
.
.
1
1
.
.
a.
a.
Low electroly
Low electroly
te level.
te level.
Check
Check
electrolyte level in battery, fill
electrolyte level in battery, fill
with distilled water as required,
with distilled water as required,
and recharge battery.
and recharge battery.
b.
b.
Alternator output
Alternator output
is bad.
is bad.
Refer
Refer
to the Alternator troubleshoot-
to the Alternator troubleshoot-
ing section below.
ing section below.
c. Loose, broken, or corroded
c. Loose, broken, or corroded
wires.
wires.
Repair or
Repair or
replace w
replace w
ires.
ires.
d. Ensure that low voltage condi-
d. Ensure that low voltage condi-
tion has not been caused by
tion has not been caused by
accessories having been left
accessories having been left
on for extended periods of
on for extended periods of
time.
time.
2
2
.
.
A
A
l
l
t
t
e
e
r
r
n
n
at
at
o
o
r
r
1.
1.
Low
Low
out
out
put
put
vol
vol
tag
tag
e (v
e (v
olt
olt
age
age
is
is
below 12 VDC).
below 12 VDC).
1.
1.
a. Ensure drive belts are tight.
a. Ensure drive belts are tight.
b. Inspect the wiring for defects.
b. Inspect the wiring for defects.
Check all connections for tight-
Check all connections for tight-
ness and cleanliness, includ-
ness and cleanliness, includ-
ing the slip connectors at the
ing the slip connectors at the
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Summary of Contents for TX180S
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