4
Component Removal, Installation and Adjustment
11
Meritor
Maintenance Manual 14R (Revised 12-18)
Figure 4.3
Adjustment
Verify Ride Height
1.
Refer to the trailer manufacturer’s specifications for the correct
ride height.
2.
Unload the vehicle before you adjust the height control valve.
Support the trailer king pin at the normal operating height.
3.
Verify the correct ride height by measuring the ride height from
the axle centerline to the bottom of the slider frame.
앫
If the measured ride height does not meet the trailer
manufacturer’s specifications:
Continue to the next step.
앫
If the measured ride height does meet the trailer
manufacturer’s specifications:
Go to Step 10.
4.
Disconnect the height control valve linkage from the lever arm.
Inflate or deflate the air springs by raising or lowering the
height control lever arm 30 to 45 degrees. Hold the lever arm
in the UP position for at least 15 seconds or until the air bags
are correctly inflated. Figure 4.4.
Figure 4.4
5.
Check the ride height. Figure 4.5. Repeat the previous step
until the measured ride height matches the trailer
manufacturer’s specified ride height.
Figure 4.5
6.
Use a 3/8-inch wrench to loosen the 0.25-inch adjusting screw
located on the lever arm body. Allow the lever arm to swing
free.
7.
Align the end of the lever arm to the top opening of the linkage.
Loosely insert the upper linkage bolt.
8.
Tighten the 0.25-inch adjusting screw to 50-55 lb-in
(6 N
폷
m).
@
9.
Connect the upper linkage bolt. Tighten the bolt to 5 lb-ft
(7 N
폷
m).
@
10. Verify that the overall trailer height does not exceed the local
legal limit.
앫
If the ride height is not within the specification:
Repeat
the ride height adjustment procedure until the ride height is
correct.
Maintain the Correct Ride Height When You
Change an HCV
You must maintain the correct ride height when you change an HCV.
Refer to the trailer manufacturer’s specifications for the correct ride
height.
Figure 4.3
Figure 4.4
400
6
715
a
LEVER
BOLT TORQUE
50-55 LB-IN
(6 N•m)
NO-DUMP
SUPPLY PORT
SUSPENSION
PORT
400
6
71
6a
HEIGHT
CONTROL
VALVE
LINKAGE
ADJUSTING
SCREW
Remove
this bolt.
30°-45°
INFLATE
DEFLATE
30°-45°
Figure 4.5
400
6
717
a
MOUNTING
HEIGHT
RIDE
HEIGHT