Advertisement
The valve body has an orifice which is sealed
by the insert in the plunger.
The orifice is
opened or closed by the movement of the
plunger . The coil causes the plunger to move
when the coil is energized .
When the coil is
de-energized the plunger is returned to its
original position by means of a spring .
The only moving parts of the valve
re the
plunger and the spring which are enclosed in
the sleeve assembly .
This arrangment within
REAR SUSPENSION 4-11
the sleeve
is
referred
to
as an
internal
solenoid.
The plunger closes the negative
circuit of the coil by coming into "face to
face"
contact
with
the
stop.
The stop,
magnetic steel, is welded to a nonmagnetic
steel tube which is welded to a magnetic
stainless steel flange to make up the sleeve
assembly .
The "face to face" design permits
the plunger to be spring loaded for positive
operation
regardless
of
valve
mounting
position.
TROUBLE DIAGNOSIS
AIR COMPRESSOR TROUBLE DIAGNOSIS CHART
(Refer to Figures 4 and 7)
PROBLEM
COMPRESSOR NOT
OPERATING . N O AIR
PRESSURE .
COMPRESSOR
OPERATES . N O AIR
PRESSURE .
AIR PRESSURE IN
SYSTEM. COMPRES-
SOR OPERATES
ERRATICALLY-
TAKES TOO LONG TO
PRESSURIZE
SYSTEM.
POSSIBLE CAUSE
2 .
3 .
4.
5 .
6 .
7 .
Open circuit breaker.
(Circuit breaker is located
behind glove box door .)
Faulty wiring. (Compressor
feed at ground wire not
connected .)
Low battery .
Faulty or pitted contacts
on pressure switch.
Motor has developed an
open circuit .
Defective diode . (Electro-
Level option only .)
Defective relay .
1 .
2.
3 .
4.
Leak in air system.
Compressor valve seat or
valve spring worn or
broken .
Piston rings are worn-
air leaks heavily at rings.
Pressure switch not
properly adjusted .
1 . Air leak in system .
2 . Compressor valve seat
or valve spring broken
or worn .
3 . Piston rings are worn-air
leaks heavily by rings.
4 . Pressure switch contacts
are pitted causing
improper compressor
action.
CORRECTION
1. Find cause of circuit breaker being
open and correct it.
2 . Check to see that wiring is intact.
3 .
4.
5 .
6 .
7 .
The compressor runs off the auto-
motive battery . Check battery
corfidition and correct as necessary.
Replace pressure switch .
Motor brushes or commutator worn
out . Replace motor .
Replace diode assembly in wiring
harness . (See figure 17 .)
Replace relay .
1 .
2 .
3 .
4 .
Eliminate air leaks in system as
described later in this section .
Replace valve seat and/or valve
spring.
Replace piston rings .
Adjust pressure switch settings
to operate at the 100-120 psi range .
1 .
2 .
3 .
4 .
Eliminate air leaks in system as
described later in this section.
Replace valve seat and/or valve
spring .
Replace piston rings.
Replace pressure switch .
Advertisement
