NHTSA ID Number: 10117678
Manufacturer Communication Number: 167-B1521-12
TSB/Document Date: 2017-09-14
Summary
SB-15-022 In the rare event that a subject vehicle equipped with the 23k Comfort Ride air suspension experiences a premature main leaf failure, a 23k HD Comfort Ride air suspension may be installed with PRIOR APPROVAL from HMM QA.
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
23K HD (Heavy Duty) Comfort Ride Conversion
CONDITION:
In the rare event that a subject vehicle equipped with the 23k Comfort Ride air suspension experiences a
premature main leaf failure, a 23k HD Comfort Ride air suspension may be installed with PRIOR APPROVAL
from HMM QA.
Mileage: less than 60,000.
Time in service: less than 2 years.
History of failure within the fleet will be considered.
1) If the failure is determined to be within criteria contact HMM QA PRIOR to ordering parts.
2) HMM QA will evaluate the failure with the supplier and determine action.
3) HMM QA and the supplier may want to go and see the failure prior to deciding repair direction.
4) Decision regarding approval will be provided within 48 hours.
NOTE: This procedure is provided as technical information and is not an authorization for a warranty repair.
SUBJECT VEHICLES:
2008 through 2013 model year conventional model trucks built with a 23k Comfort Ride air suspension.
BEFORE YOU BEGIN:
Read and understand all instructions and procedures before you begin work
Read and follow all WARNINGS and NOTICES set forth in this publication. These alerts help to avoid
damage to components, serious personal injury or both.
Park the vehicle on a flat, level and solid surface.
Place the gear shift lever in "Neutral" or "Park".
Apply the parking brake firmly and confirm parking brake activation.
Turn off the engine and remove the key from the ignition switch.
Always wear safety glasses or goggles to protect your eyes.
Place wheel chocks in front of and behind the front wheels to prevent the vehicle from moving.
Page 1 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
VEHICLE PREPARATION:
1. Park the vehicle on level ground.
2. Confirm the engine is stopped, the
ignition switch in the off (LOCK) position
and the key is removed.
3. Apply the parking brake.
Page 2 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
4. Chock the front wheels.
REPAIR PROCEDURE:
1. Raise the vehicle and support the rear
frame rails with jack stands.
Page 3 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
2. Support the rear differential center
section. Also place another jack stand
under the pinion bearing area of the
differential.
WARNING: Do not remove jack stand or
jack from under differential until this
repair procedure is completed.
3. Remove the rear fenders on both right
and left sides of vehicle if equipped.
NOTE: Depending on the particular
vehicle the rear fenders may have to be
removed to allow you to remove the rear
wheels and access to the rear suspension
components and frame hangers.
4. Remove both sets of the right and left
rear wheels.
Page 4 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
5. Measure the ride height from the
center of the left side shock absorber
upper stud and the center of the lower
bolt. The height should be at the specified
ride height.
HINO SPECIFICATION: 21 7/8 in (555mm)
NOTE: If the ride height is not at the
specified height it will be necessary to
adjust the ride height after steps 6
through 8 are completed.
6. Disconnect the height control valve
arm by removing the linkage rod
grommet from the height control valve
arm.
Page 5 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
7. Rotate the arm on the height control
valve downward. This will exhaust the air
from the right and left air springs.
8. Disconnect the air line from both the
right air spring tee fitting and the left air
spring tee fitting.
NOTE: The left air spring is shown in the
photo as a reference.
NOTE: If the ride height is out of specification, adjust the ride height to specification using a jack under the
differential center section. It will also be necessary to adjust the jack stand under pinion bearing area of the
differential if the differential is raised or lowered to adjust the ride height.
HINO Specification: 21 7/8 in (555mm)
WARNING: Do not continue to step 9 unless the air line is disconnected from both the right air spring and
left air spring.
Page 6 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
9. Remove the right and left side lower
shock absorber nuts, washers and bolts
and set them aside.
NOTE: The left shock absorber is shown in
the photo as a reference.
10. Remove the 2 lock nuts, 2 bolts and 2
washers from the left air spring upper
mounting bracket. Discard the bolts,
washers and nuts.
11. Spray some penetrant on the left air
spring locknut and lower stud. After
penetrant is sprayed, remove the left air
spring stud lock nut and washer. Discard
the lock nut.
NOTE: Care should be taken not to break
the air spring lower stud.
Page 7 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
12. Remove the left air spring from the
vehicle.
13. Remove the 2 bolts, 2 washers and 2
locknuts that connect the cross channel
and left lower shock absorber mounting
bracket with the main leaf. Discard the
bolts, washers and nuts.
14. Remove the 2 lock nuts, 2 bolts and 2
washers from the right air spring upper
mounting bracket. Discard the bolts,
washers and lock nuts.
Page 8 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
15. Spray some penetrant on the right air
spring locknut and lower stud. After
penetrant is sprayed, remove the right air
spring stud lock nut and washer. Discard
the lock nut.
NOTE: Care should be taken not to break
the air spring lower stud.
16. Remove the right air spring from the
vehicle.
17. Remove the 2 bolts, 4 washers, 2
locknuts and then remove the height
control valve from the cross channel.
Discard the 2 bolts, 4 washers and 2
locknuts.
Page 9 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
18. Remove the 2 bolts, 2
washers and 2 locknuts that
connect the cross channel and
right side lower shock
absorber mounting bracket
with the main leaf. Discard the
bolts, washers and nuts.
19. Remove the cross channel and both
the left and right lower shock absorber
mounting brackets. Discard the cross
channel.
20. Remove the 4 nuts, 4 washers and 2
U-bolts from the left axle bottom cap.
Discard the U-bolts, nuts and washers.
Page 10 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
21. Remove the left top spring
pad.
NOTE: The U-bolts have been
removed in the photo.
22. Position another jack
stand under the center of the
left side main leaf eyelet.
23. Remove the lock nut, 2
washers, bolt,
Quick Align Eccentric Collar
and Quick Align Concentric
Collar.
Discard all of these
components.
NOTE: Quick Align Concentric
Collar is not visible in photo.
Page 11 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
24. Remove the left main leaf
and discard.
NOTE: The jack stand under
the main leaf eyelet has been
removed in the photo
25. Remove the left spring
seat from the axle housing.
26. Visually inspect the axle
housing and the dowel pin on
the left side to confirm no
signs of damage.
NOTE: Repair or replace as
necessary.
Page 12 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
27. Remove the 6 huck spin
retainers from the left frame
hanger and discard them.
28. Remove the left frame
hanger from the frame rail and
discard it.
NOTE: The photo shows the
left frame rail with the frame
hanger removed.
29. Remove the left side air
line bracket bolt.
NOTE: The bolt which is shown
in the photo, secures an air
line bracket located on the
inner edge of the frame rail.
Page 13 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
30. Remove the 6 huck spin
bolts from the left frame rail
and discard them.
NOTE: Do not bend or damage
the air line bracket during
removal of the huck spin bolts.
The photo shows 5 new huck
spin bolts in the frame rail for
reference only.
31. Clean off the left side of
the frame rail, which includes
inside the 6 holes where the
frame hanger is mounted,
using compressed air.
NOTE: There are 2 available
huck spin bolt and retainer
types available for use with
this kit, “huck spin 1” or “huck
spin 2”. Depending upon the
tools available at your
approved repair facility, make
certain that the correct huck
spin bolts and retainers are
used.
Page 14 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
32. Install the 6 huck spin
bolts onto the frame rail.
NOTE: Do not bend or damage
the air line bracket during
installation of the huck spin
bolts.
33. Install the left side air line
bracket bolt. Make certain the
bracket alignment tab is
indexed with the alignment
hole in the frame rail. Tighten
to the specified torque.
Specified Torque: 10lb-ft
(13Nm)
34. Install the new left frame
hanger onto the left frame rail.
Install the 6 huck spin
retainers and finger tighten
them until the frame hanger
seats against the frame rail.
NOTE: Make certain that the
arrow on the new frame
hanger is facing toward the
front of the vehicle.
Page 15 of 49
Vendor Ref.: HMM-140411-1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-022
03-17-2015
SERVICE BULLETIN
35. Using the Huck-Spin
Fastening System, complete
the swaging of the 6 huck spin
retainers to the 6 huck spin
bolts.
NOTE: Follow the instructions
for use provided with the
Huck-Spin Fastening System
tool.
36. Use the numerical
tightening sequence shown in
the photo and complete the
tightening process with the
Huck-Spin Fastening System
tool.
37. After completing the
tightening process, using a Ubolt washer, test each of the 6
huck spin retainers. This will
check for correct swaging. If
the washer will slip over the
huck spin retainer, the huck
spin bolt and retainer is
tightened correctly.
NOTE: If the U-bolt washer
will not slip over the huck spin
retainer and it has already
been swaged, it will need to
be replaced.
Page 16 of 49
Vendor Ref.: HMM-140411-1
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TSB/Document ID: 167-B1521-12
Replacement Service Bulletin Number:
MFR Communication Date: 2015-03-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SUSPENSION
MFR Component System:
MFR Component Subsystem:
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