NHTSA ID Number: 11014702
Manufacturer Communication Number: CBR - 2016 202502
TSB/Document Date: 2025-03-03
Summary
CBR - Troubleshooting cab lean should only begin after completing a vehicle preparation procedure to ensure all components are in place and settled.
2/28/25, 10:19 AM
Article
Preview Solution CBR-2016-13
Frame Or Cab Lean
Published 12 February 2025
Valid For
Volvo
Models - All
Model year 2016 to current.
1.0 Vehicle Preparation
Troubleshooting cab lean should only begin after completing a vehicle
preparation procedure to ensure all components are in place and settled.
• The complete truck must be run for 16 kilometers (10 miles) minimum.
• Ensure that all tires are inflated to the correct pressure.
• If the vehicle is equipped with rear air suspension, you must cycle the
suspension before taking measurements. This will reset the rear suspension to
the correct ride height and ensure the vehicle rake (i.e. inclination) is correct.
To do so:
» Ensure that the parking brake is released and no service brake is
being applied
» Release the air from the air springs to lower the suspension
» Raise the suspension back up to the nominal drive level height
2.0 Taking Measurements
2.1 Where to Measure
With the truck on a flat and level surface, the frame height from ground will be
measured on both the left and right hand side separately using a vertically
oriented measuring tool.
This shall be done from the bottom side of the frame near the frame side web, as
near as possible to the front axle location.
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a
Obtaining this measurement can be complex - the front springs are directly below the
frame rail lower flange, making it difficult to drop a tape measure straight down to the
floor.
The process may be made easier by placing a straight edge against the lower flange
of the frame (pictured right), then measuring outboard of the frame. Additionally, you
may need to crawl beneath the truck to take this measurement.
a
a
; Live UI
2.2 Measurement Standards
A difference in height (measuring as instructed above) between both sides must be ≤
11mm (an incline of 0.6° maximum). If the measurement is found to be greater than
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the standard, a ride height difference of ≤ 11mm should be attainable in most
instances by following the instructions which follow.
a
Click HERE for a printable worksheet.
a
3.0 Front Correction Process
3.1 Process to Correct Front Cab Lean
3.1.1 Determine if the vehicle has a Standard or High front ride height
Determine the front ride height by measuring the rear height (A) of the
wedge located on the left hand side of the truck (pictured below).
a
a
Utilize the following table along with the measured rear height of the wedge to
determine the front ride height designation:
a
a
(A) Measurement
Front Ride Height
37MM
73MM
; Live UI
STANDARD
HIGH
a
3.1.2 Measure the difference in chassis height (right-hand vs. left-hand)
a
In accordance with the measurement location requirements outlined in section
2.0, measure the distance from the floor to the bottom of the frame on the lefthand and right-hand sides individually.
Calculate the frame height difference (B) with the following formula:
B = right hand frame height - left hand frame height
a
3.1.3 Find the parts required to correct the lean
Consult the tables provided in Section 4.0 to determine the wedges, U-bolts,
and nuts required to level up the chassis. If the calculated height difference (B)
does not match the number in the table exactly, choose the closest one - there
is no preference for measurements slightly over or under the calculated (B).
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a
NOTE: When replacing the wedge on the left-hand side, the U-bolt
hardware MUST also be replaced.
a
NOTE: Performing suspension work may result in load redistribution.
Before remeasuring the cab lean, follow the guidelines in the Vehicle
Preparation Section.
a
Once the vehicle has been remeasured and it has been determined that the
lean has been corrected and no further suspension adjustments are needed,
the final step is to
perform a vehicle alignment.
a
4.0 Part References
a
4.1 Factory Installed Right-Hand Side WedgeFactory Installed RightHand Side Wedge
a
a
FRONT RIDE HEIGHT
WEDGE PART NUMBER
THICKNESS (MM)
Standard
20435531
20
High
20435533
56
a
4.2 Left-Hand Wedge Selection, Highway Vehicles
4.2.1 Standard Front Ride Height
a
RIDE
INDIVIDUAL
RECOMMENDED
REQUIRED
INDIVIDUAL FRONT
U-BOLT PART
HEIGHT
WEDGE
PART
WEDGE STABILIZER
DIFFERENCE
THICKNESS
NUMBER ***
NUMBERS
ANGLE (°)
BAR?
(B)
(MM)**
FRONT REAR
; Live UI
0*
20435532
28
6.25°
8
20836936
36
6.25°
12
20435531
21602505
20
20
6.25°
0°
Yes
20529990
No
Yes
20529989
20529990
No
Yes
20560239
20560240
No
20560239
20560240
20529990
20560239
NUT
20560239
20560239
20529990
16
20836939
44
6.25°
Yes
No
20
20435532
21602505
28
20
6.25°
0°
Yes
No
20560240
20529990
20560239
28
20836936
21602505
36
20
6.25°
0°
Yes
No
20560240
20560240
20529990
21823706
a
* NOTE 1: Factory installed left-hand side wedge arrangement
** NOTE 2: This wedge thickness is at the center of the wedge. It is not the rear of the
wedge (A)
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*** NOTE 3: U-bolts should have at least 3mm thread sticking out beyond the top of the
nut. In case this is not achieved with the suggested U-bolt part number, replace and use a
longer part number from section
4.4
a
a
a
4.2.2 High Front Ride Height (FIH220)
a
RECOMMENDED
RIDE
INDIVIDUAL
REQUIRED
INDIVIDUAL FRONT
HEIGHT
WEDGE
U-BOLT PART
PART
WEDGE STABILIZER
NUT
DIFFERENCE
THICKNESS
NUMBER ***
NUMBERS
ANGLE (°)
BAR?
(B)
(MM)**
FRONT REAR
0*
20435534
64
6.25
11
22968914
75
6.25
20
20435534
21602505
64
20
6.25
0
31
22968914
21602505
75
20
6.25
0
Yes
No
24427625
20560240
20529990
Yes
24427625
No
Yes
20560240
21180646
No
Yes
20560240
21246746
No
24427625
24427625
21823706
24427625
21180646
a
* NOTE 1: Factory installed left-hand side wedge arrangement
** NOTE 2: This wedge thickness is at the center of the wedge. It is not the rear of the
wedge (A)
*** NOTE 3: U-bolts should have at least 3mm thread sticking out beyond the top of the
nut. In case this is not achieved with the suggested U-bolt part number, replace and use a
longer part number from section
4.4
a
4.3 U-Bolt List for Highway Vehicles
a
PART NUMBER
LENGTH (MM)
20529989
20560239
180
200
20529990
20560240
215
235
22427625
255
21180646
21246746
265
285
a
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6/6
Location
1
2
3
4
5
Front of Frame
Rear of Frame
Back of Cab
Front of Tandems
Rear of Tandems or
Rear of Frame
Measurement
Right
Left
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TSB/Document ID: CBR - 2016 202502
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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