Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 90
REAR AXLE ASSEMBLY
REMOVE
(1) Raise vehicle (see Hoisting, Group 0). Support
axle with jack stands and remove wheel and tire as-
sembly.
(2) Separate park brake cable at connector. Detach
cable housing from hanger bracket (Fig. 1).
(3) Remove lock and separate brake tube assembly
from brake hose mounting bracket (Fig. 1).
(4) Remove lower shock absorber through bolts and
track bar to axle pivot bolt. Support track bar end
with wire (Fig. 2).
(5) Lower axle until spring and isolator assemblies
can be removed. Remove spring and isolator assem-
blies (Fig. 3).
(6) Support pivot bushing end of the trailing arms.
(as well as axle beam with jack stands) Remove pivot
bushing hanger bracket to frame screws. Lower and
remove axle assembly from vehicle.
(7) Remove rear brake assemblies, see Group 5 for
proper procedure.
(8) For pivot bushing removal and installation see
PIVOT BUSHING this group.
INSTALLATION
(1) Raise and support axle on jack stands.
(2) Attach pivot bushing hanger brackets to frame
rail (Fig. 4). Tighten screws to 61 N
Im (45 ft. lbs.)
torque.
(3) Install springs and isolators (Fig. 5).
(4) Raise axle and install shock absorber and track
bar through bolts loose assemble only (Fig. 6).
(5) Install brake assembly as follows:
DRUM BRAKE ASSEMBLY
(1) Position spindle, seal, and brake support to
axle after routing park brake cable through trailing
arm opening and brake tube over arm (Figs. 1). In-
stall the 4 spindle mounting bolts finger tight. Then
torque the 4 spindle mounting bolts to 75 N
Im (55 ft.
lbs.) torque.
(2) Install brake drum and bearings.
Fig. 1 Remove Brake Hose Mounting Bracket Screw
and Park Brake Cable
Fig. 2 Remove Shock Absorber and Track Bar Bolts
Fig. 3 Remove/Install Coil Spring and Isolator
Assembly
Fig. 4 Attach Hanger Brackets to Frame
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SUSPENSION AND DRIVESHAFTS
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(3) Install washer and nut. Tighten nut to 27-34
N
Im (240-300 in. lbs.) torque while rotating brake
drum. Then back off nut to completely release pre-
load. Finger tighten nut.
(4) Position nut lock with one pair of slots in-line
with cotter pin hole. Install cotter pin. Clean and in-
stall grease cap.
DISC BRAKE ASSEMBLY
(1) Position caliper support and spindle to axle. In-
stall the 4 spindle mounting bolts finger tight. Then
torque the 4 spindle mounting bolts to 75 N
Im (55 ft.
lbs.) torque.
(2) Install hub and bearings.
(3) Install washer and nut. Tighten to 27-34 N
Im
(240-300 in. lbs.) torque while rotating hub. Then
back off nut to completely release preload. Finger
tighten nut.
(4) Position nut lock with one pair of slots in-line
with cotter pin hole. Install cotter pin. Clean and in-
stall grease cap.
(5) Install braking disc and adapter. Install caliper
assembly (see Rear Disc Brake) in Brakes Section,
Group 5.
(6) Attach brake hose and parking brake cable to
caliper and suspension arm (Fig. 7). Install brake
hose mounting bracket to caliper support.
(7) Route park brake cable through hanger bracket
and lock housing end into bracket. Install cable end
into (intermediate) connector (Fig. 7).
(8) Install brake hose and fitting into bracket and
install lock. Attach brake tube assembly to hose fit-
ting and tighten to 16 N
Im (140 in. lbs.) torque (Fig.
7).
(9) Install wheel and tire assemblies and tighten
wheel stud nuts to 129 N
Im (95 ft. lbs.) torque. Re-
move jacks and lower vehicle.
(10) With suspension supporting vehicle, torque
lower shock absorber bolts to 61 N
Im (45 ft. lbs.).
Then torque track bar bolt to 95 N
Im (70 ft. lbs.).
(11) Bleed brake system. See BRAKES, Group 5.
Fig. 5 Install Springs and Isolators
Fig. 6 Install Shock Absorber and Track Bar
Fasteners (Bolts)
Fig. 7 Reconnect Brake Tube and Park Brake Cable
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SUSPENSION AND DRIVESHAFTS
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AUTOMATIC AIR LOAD LEVELING SYSTEM
INDEX
page
page
Compressor Performance Test
. . . . . . . . . . . . . . 61
Compressor Relay
. . . . . . . . . . . . . . . . . . . . . . . . 72
Control Module
. . . . . . . . . . . . . . . . . . . . . . . . . . 72
General Information
. . . . . . . . . . . . . . . . . . . . . . . 59
Major Components
. . . . . . . . . . . . . . . . . . . . . . . 59
Rear Leveling Diagnostic Procedures
. . . . . . . . . 65
Right Shock Absorber (With Height Sensor)
. . . . 72
Service Procedures
. . . . . . . . . . . . . . . . . . . . . . . 62
System Operation
. . . . . . . . . . . . . . . . . . . . . . . . 61
GENERAL INFORMATION
The automatic air load leveling system includes
the following (Fig. 1).:
• Compressor Assembly
• Control Module Wiring Harness
• Air Lines
• Compressor Relay
• Air Shock Absorbers
• Air Dryer
This system is used to supplement standard sus-
pension systems on vehicles so equipped.
MAJOR COMPONENTS
COMPRESSOR ASSEMBLY
The compressor assembly is driven by an electric
motor and supplies air pressure between 1172 to
1516 kPa (170 to 220 psi) (Fig. 2). A solenoid oper-
ated exhaust valve, located in the compressor head
assembly, releases air when energized.
CONTROL MODULE
The Control Module (CM) is a device that controls
the ground circuits for the compressor relay and the
exhaust valve solenoid. A microprocessor within the
module limits the compressor pump operation time to
140 to 160 seconds. To prevent damage to the com-
pressor motor.
Fig. 1 Automatic Air Load Leveling System
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SUSPENSION AND DRIVESHAFTS
2 - 59
In addition, there is an air regeneration cycle that
is controlled by the Control Module (CM). If the
height sensor signal is in the neutral or high posi-
tion. When the ignition switch is turned to the ON
position, after a 22 to 28 second delay, the compres-
sor will run from 2 to 6 seconds.
To prevent excessive cycling between the compres-
sor and the exhaust solenoid circuits during normal
ride conditions. A 12 to 18 second delay is incorpo-
rated in the microprocessor.
HEIGHT SENSOR
A magnetic switch type sensor, located in the right
air shock absorber, monitors rear vehicle height. The
sensor sends signals to the (CM) relating to vehicle
rear suspension status (low, trim, high).
AIR LINES AND FITTINGS
To release an air supply line from a rear shock ab-
sorber assembly. Push in (toward shock absorber) on
the plastic ring of the shock absorber air line fitting.
Then while holding in the plastic ring on shock ab-
sorber fitting pull the air supply line strait out of fit-
ting (Fig. 3).
The fitting has a unique push-in feature. A brass
type collet locks the air line in place. One rubber
O-ring seals the air line to prevent air leakage. To
attach air line, push into fitting (Fig. 4).
COMPRESSOR RELAY
The relay is mounted to a bracket on the Control
Module (CM). When the relay is energized, it allows
the compressor to operate. This unit is controlled by
the CM.
AIR ADJUSTABLE SHOCK ABSORBERS
Air shock absorbers are essentially hydraulic shock
absorbers with a neoprene bladder sealing upper and
lower sections together. This creates an air cylinder
inside of the shock absorber.
AIR DRYER
The air dryer is attached to the compressor. This
component serves two purposes; it absorbs moisture
from the atmosphere before it enters the system. And
with the internal valves maintains a residual system
pressure of 69 to 152 kPa (10 to 22 psi).
AIR CHECK, RESIDUAL (FIG. 5).
The air dryer has a valves arrangement that main-
tains 69 to 152 kPa (10 to 22 psi) in the air shocks.
This is to improve the ride characteristics of the ve-
hicle under light load conditions. To test this func-
tion, perform the following procedure:
(1) Remove the air line from the dryer and right
shock absorber. Attach a piece of bulk nylon tubing
to one side of a Pressure Gauge (0-300 psi), and to
the right shock absorber (Fig. 5).
(2) Attach another piece of nylon tubing from the
dryer (compressor) to other side of the pressure
gauge.
Fig. 2 Compressor Assembly
Fig. 3 Release Air Line from Fitting
Fig. 4 Push Air Line into Fitting
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SUSPENSION AND DRIVESHAFTS
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