NHTSA ID Number: 10117682
Manufacturer Communication Number: 167-B1525-12
TSB/Document Date: 2017-09-14
Summary
SB-15-028 A COE if equipped with a severe duty body application may experience excessive body roll or poor handling at highway speeds. This TSB (Technical Service Bulletin) outlines an inspection procedure highlighting approved body installation guidelines and the need for a general suspension inspection. Also included are two repair procedures where the front and rear suspension can be modified to reduce the amount of body roll and stiffen the ride quality.
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
12MY-16MY 195, 195h COE STABILITY UPGRADE
OVERVIEW
A COE if equipped with a severe duty body application may experience excessive body roll or poor handling at
highway speeds. This TSB (Technical Service Bulletin) outlines an inspection procedure highlighting approved body
installation guidelines and the need for a general suspension inspection. Also included are two repair procedures
where the front and rear suspension can be modified to reduce the amount of body roll and stiffen the ride quality.
NOTE: This procedure is provided as technical information and is not an authorization for a warranty repair.
If there are any questions, contact your Technical Service Manager.
SUBJECT VEHICLES
Certain 12MY – 16MY Hino COE (Cab over Engine) trucks with a J05E engine.
BEFORE YOU BEGIN:
- Read and understand all instructions and procedures before you begin the 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 level and solid surface and apply the parking brake.
- Place the gear shift lever in "P" or "Park".
- Apply the parking brake firmly and confirm parking brake activation.
- Confirm the engine is stopped, the ignition switch is in the off (LOCK) position, and the key is removed.
- Always wear safety glasses to prevent eye injuries.
Place wheel chocks in front of and behind all the wheels to prevent the vehicle from moving.
PARTS
PART NUMBER
SPRING ASSY, FR, LH
SPRING ASSY, FR, RH
U BOLT
U BOLT
NUT
REAR HELPER LEAF
SPACER
CENTER BOLT
NUT
U BOLT
NUT
REAR BUMP STOP
BOLT
Page 1 of 11
PART DESCRIPTION
4811037Y60
4811037Y70
9011716075
9011716065
9017816004
4826437F31
4828237N60
482473V280
482840W070
9011718020
9017818002
4834437420
9155281020
QUANTITY
1
1
2
2
8
2
2
2
2
4
8
2
4
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
VEHICLE PREPARATION:
1. Park the vehicle on level and solid
surface.
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 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
4. Chock the front wheels.
INSPECTION PROCEDURE
1. Verify that all six tires are inflated to the placard specification. High or low tire
pressures can cause undesirable handling characteristics. If tire pressures are proper,
raise the front of the vehicle and support it with jack stands. Check for any loose or worn
suspension components. Repair any worn suspension components as needed. Lower the
vehicle, remove the wheel chocks, and road test it to determine if the handling has
improved. If the vehicle still has undesirable handling characteristics, proceed to step 2,
below.
2. Refer to chapter 6 of the current body builder guide for guidelines regarding proper
mounting of the vehicle’s body and frame extensions. It is important that the proper wooden
shims be installed between the body and the frame of the vehicle. It is critical that wooden
props be installed within the frame rail at each U-bolt mounting location. It is also critical that
each U-bolt is tight and placed in the proper position. Examples from the body builder’s guide
are shown below, but you must refer to the body builder guide for more detailed information.
Page 3 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
Page 4 of 11
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
Page 5 of 11
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
3. If any body mounting concerns are identified, correct them and road test the vehicle
for improved handling. If the vehicle still has undesirable handling characteristics as
described within the overview above, proceed to the repair procedure, below.
NOTICE: This TSB contains two repair procedures which outline modifications to the
front and rear suspension on the vehicle. Vehicles with the VIN numbers starting with
“JHH” built on or after March 4, 2015. DO NOT perform Repair Procedure A as the
vehicle already has factory installed updated front springs. If the subject vehicle was
built before the dates mentioned above, first perform Repair Procedure A. After Repair
Procedure A has been completed, ask the customer to drive the vehicle and assess its
handling capabilities. If the handling is acceptable after installing the updated front
springs, DO NOT perform Repair Procedure B.
If the customer still feels that body roll is excessive, even after the updated front springs
are installed, perform Repair Procedure B. Note that performing Repair Procedure B will
result in a firmer ride.
REPAIR PROCEDURE A
Front suspension modification for vehicles with VIN number beginning in JHH built before March 4, 2015.
NOTICE: This repair procedure requires the removal and discarding of both front leaf
spring assemblies. These original front leaf spring assemblies have a weight rating of
3,100kg. This TSB directs you to install new front leaf spring assemblies which have an
increased weight rating of 3,300kg. The increased weight rating of the front spring leaf
assemblies does NOT change the overall GVWR (Gross Vehicle Weight Rating) of the
vehicle.
WARNING: ALWAYS make certain that all four steps of the Vehicle Preparation
Procedure, described above, have been performed before proceeding with this repair
procedure.
Page 6 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
1. Raise and support the front of the vehicle using jack stands. Remove and discard the
driver’s side front leaf spring as outlined in the Suspension section of the Chassis
Workshop Manual. The 2 U-bolts and 4 U-bolt nuts which secure the leaf springs to the
front axle must be discarded.
Nuts
Leaf Spring
2. Install the replacement front driver’s side leaf spring (Part No. 4811037Y60) into the
vehicle using new U-bolts and new U-bolt nuts following the procedure in the Chassis
Workshop Manual Suspension section.
3. Remove and discard the passenger side front leaf spring as outlined in the Suspension
section of the Chassis Workshop Manual. The 2 U-bolts and 4 U-bolt nuts which secure
the leaf springs to the front axle must be discarded.
Nuts
Leaf Spring
4. Install the replacement front passenger side leaf spring (Part No. 4811037Y70) into the vehicle using new
U-bolts and new U-bolt nuts following the procedure in the Chassis Workshop Manual Suspension section.
Lower the front of the vehicle onto the ground.
Page 7 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
REPAIR PROCEDURE B
Rear suspension modification for all subject vehicles with updated front springs
NOTICE: For vehicles with VIN number beginning in JHH built before March 4, 2015,
repair Procedure B should not be performed unless the customer has assessed vehicle
handling after Repair Procedure A has been performed, and the customer still feels that
body roll is excessive.
WARNING: ALWAYS make certain that all four steps of the Vehicle Preparation
Procedure, described above, have been performed before proceeding with this repair
procedure.
1. Raise and support the rear of the vehicle using jack stands. Remove the driver’s side
rear leaf spring from the vehicle as outlined by the Suspension section of the Chassis
Workshop Manual. Discard the 2 U-bolts and 4 U-bolt nuts which secure the leaf spring
to the axle. Remove and discard the center bolt from the leaf spring as outlined in the
manual. Discard the center bolt and center bolt nut. Retain the rear leaf spring for
reinstallation. The spring pack will be modified to add an additional helper leaf and
spacer.
2. Assemble the spring pack referring to the diagram below for proper placement of the
new helper leaf and spacer. Install the new center bolt (Part No. 482473V280) and
center bolt nut (Part No. 482840W070) following the procedure in the Chassis
Workshop Manual Suspension section.
Page 8 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
3. Reinstall the driver’s side rear leaf spring assembly with the new helper leaf and
spacer into the vehicle following the procedure in the Chassis Workshop Manual using
new U-bolts and new U-bolt nuts.
4. Remove the passenger side rear leaf spring from the vehicle as outlined in the Suspension section of the
Chassis Workshop Manual. Discard the 2 U-bolts and 4 U-bolt nuts which secure the leaf spring to the axle.
Remove the center bolt from the leaf spring as outlined in the manual. Discard the center bolt and center bolt
nut. Retain the rear leaf spring for reinstallation. The spring pack will be modified to add an additional helper
leaf and spacer.
5. Assemble the spring pack referring to the diagram below for proper placement of the
new helper leaf and spacer. Install the new center bolt (Part No. 482473V280) and
center bolt nut (Part No. 482840W070) following the procedure in the Chassis
Workshop Manual Suspension section.
6. Reinstall the passenger side rear leaf spring assembly with the new helper leaf and spacer into the vehicle
following the procedure in the Chassis Workshop Manual using new U-bolts and new U-bolt nuts.
Page 9 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
Passenger Side
7. Remove and discard the 2 bolts
retaining the left rear and right rear bump
stops onto the frame. Discard the left rear
and right rear bump stops.
NOTICE: The passenger side is shown in
the illustration to the right. The driver’s
side, not shown, is similar.
8. Install the new left rear and right rear
bump stops (Part No. 4834437420). Install
the 2 bolts retaining the left and the right
rear bump stops onto the frame (Part No.
9155281020). Tighten the 2 bolts to the
specified torque.
Bolts
Bump
Stop
Bolts
Bump
Stop
NOTICE: The passenger side is shown in
the illustration to the right. The driver’s
side, not shown, is similar.
Specified Torque: 29 lb-ft (39 Nm)
Page 10 of 11
Vendor Ref.: HMM-150609-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
48-Suspension
SB-15-028
06-11-2015
SERVICE BULLETIN
FINAL INSPECTION PROCEDURE
1. To complete this Technical Service Bulletin, review the bulletin and confirm the following:
Any components which have been replaced were installed following workshop
manual procedures.
The U-bolts and U bolt nuts were replaced on any leaf springs which were removed,
and all replaced U-bolt and U bolt nuts have been discarded.
All nuts and bolts have been tightened to their specified torque.
NOTE: This procedure is provided as technical information and is not an authorization for a warranty repair.
If there are any questions, contact your Technical Service Manager.
Page 11 of 11
Vendor Ref.: HMM-150609-J1
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TSB/Document ID: 167-B1525-12
Replacement Service Bulletin Number:
MFR Communication Date: 2015-06-11
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Communication Type: Service Bulletin/Repair Instructions
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