4
Component Removal, Installation and Adjustment
20
Meritor
Maintenance Manual 14R (Revised 12-18)
앫
If adjustment is required:
Proceed to Step 3.
앫
If adjustment is not required:
Proceed to Step 7.
3.
Loosen the bolt that connects the rear axle upper control arm
to the frame bracket located on the same side of the
suspension as the adjustable lower control arms. You must
loosen this connection before you align the axle to prevent
premature bushing and component damage. Loosen the lower
control arm clamp bolts.
4.
Align the axle so that the difference between measurements C
and D does not exceed 1/16-inch (1.588 mm). Figure 4.21.
5.
Adjust the length of the adjustable lower control arm as
required.
6.
Check the axle alignment.
앫
If adjustment is required:
Repeat Steps 3 and 4 until the
alignment is correct.
앫
If adjustment is not required:
Proceed to Steps 7 and 8.
7.
When the axle is aligned correctly, tighten the lower control
arm clamp bolts to 160-170 lb-ft (217-231 N
폷
m).
@
8.
Tighten the upper control arm pivot bolt to 450-500 lb-ft
(611-678 N
폷
m).
@
Auto-Dump Configuration
The auto-dump configuration prevents the RideSentry™ MPA
Series sliding tandem trailer air suspension from moving the trailer
floor up and down as much as three-inches (76 mm). This is a usual
occurrence with any soft, low spring-rate suspension. However,
without the auto-dump configuration, the RideSentry™ MPA Series
suspension design would still prevent dock walk.
Trailer applications may require automatic dump of the suspension
when the glad hands are disconnected from the trailer. The
suspension is equipped with the 1500 Series HCV. Figure 4.22.
The HCV’s automatic exhaust and fill operation ensures that the
suspension air pressure is correct. The valve automatically exhausts
air from the air springs and lowers the suspension to the bump
stops each time you engage the trailer’s parking brake. The HCV
refills the suspension when you release the parking brake.
The HCV air plumbing allows the HCV to dump the air suspension
when the pilot air is lost to the Auto-Dump valve pilot port.
Figure 4.22.
Install the air lines in the correct ports as shown in Figure 4.22. All
tubing must be SAE J844 Type B.
To Auto-Dump from No-Dump
Replace the no-dump HCV (Figure 4.23) with the auto-dump HCV
(Figure 4.22).
Figure 4.22
No-Dump Configuration
The no-dump configuration enables the trailer to maintain ride
height during loading and unloading if it is attached to an air supply.
The suspension is equipped with the 1500 Series HCV. Figure 4.23.
Some applications do not require the suspension to dump air from
the air springs. Figure 4.23 shows the 1500 Series no-dump
configuration.
Install the air lines in the correct ports as shown in Figure 4.23. All
tubing must be J844 Type B.
To No-Dump from Auto-Dump
Replace the auto-dump HCV (Figure 4.22) with the no-dump HCV
(Figure 4.23).
Figure 4.23
Figure 4.22
Figure 4.23
400
6
714
a
LEVER
SUPPLY PORT
DUMP PILOT
PORT
SUSPENSION
PORT
BOLT TORQUE
50-55 LB-IN
(6 N•m)
AUTO-DUMP
400
6
715
a
LEVER
BOLT TORQUE
50-55 LB-IN
(6 N•m)
NO-DUMP
SUPPLY PORT
SUSPENSION
PORT