Meritor RideSentry MPA Series, Maintenance Manual, Page: 16 / 32

4 Component Removal, Installation and Adjustment
13
Meritor Maintenance Manual 14R (Revised 12-18)
Figure 4.7
6. Remove the nuts from the studs that secure the top of the air
spring.
7. Remove the nut from the bottom of the air spring. You can
reach the nut from inside the front or rear of the upper axle
seat.
8. Compress the air spring. Remove the spring from the
suspension.
9. Compress the new air spring. Slide the spring into the space
between the axle seat and slider frame. Reuse the air spring
spacer(s), if originally supplied.
10. Align the air inlet and mounting stud. Insert them into the holes
in the slider frame.
11. Install the lower nut. Tighten the lower nut to 30-35 lb-ft
(41-47 N
폷
m).
@
12. Install the nuts on the top mounting studs. Tighten the 1/2-13
UNC nut to 20-25 lb-ft (30-35 N
폷
m). Tighten the 3/4-16 UNF
nut to 45-50 lb-ft (60-70 N
폷
m).
@
13. Install the fitting and inlet air line to the top of the air spring.
Apply a sealant tape.
14. Seat the valve at the bottom of the air tank. Pressurize the air
system.
15. Check that items such as tires, air lines or suspension
components do not interfere with the air spring flex members.
16. Use a soap solution to check the entire system for air leaks.
17. Raise the trailer. Remove the safety stands.
18. Verify that the ride height of the trailer is correct.
앫
If the ride height is incorrect: Adjust the height control
lever arm to obtain the correct ride height. Refer to the
trailer manufacturer’s specifications for the correct ride
height.
Figure 4.7
BRAKE
PROTECTION
VALVE
PILOT
RELAY
VALVE
400 6 718 a
CURBSIDE
ROADSIDE
TO
AIR SPRINGS
AIR
SPRINGS
TRAILER
SPRING
BRAKE
VALVE
GLAD HAND
SUPPLY
EMERGENCY
PARKING,
RED
GLAD
HAND
CONTROL,
BLUE
AIR
RESERVOIR
FROM BRAKE
PROTECTION
VALVE
HEIGHT CONTROL
VALVE