Check and adjust camber and caster at front axle

AR40.20-S-0322SA

Check and adjust camber and caster at front axle

26.11.2019

Model

639

with code XZ1 (Model generation 1)

α

Camber

τ

Run-on

1

Cam bolt

2

Collar bolt



Check

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

Topical note

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

1

Note general information on the wheel alignment check

AR40.20-S-0201S

 On vehicles with code XZ1 (Model generation 1), the caster (r) is no longer checked as per the specification.

2

Set zero position of air suspension

Only with code CL0 (Rear lowerable and raisable air suspension)

 Insert assembly device at rear axle and lower vehicle until it makes contact with the assembly device. The current zero position corresponds to a clinometer angle of 0.82° on the rear axle shaft.

 Assembly device

*639589022300

3

Measure vehicle level at front and rear axles with electronic inclinometer

AR40.20-S-0302S

4

Perform wheel alignment check

AR40.20-S-0200S

 During the wheel alignment check the actual chassis data such as camber (α) and toe, should be determined, irrespective of the vehicle level.

5

Check camber (α) using vehicle level and match with value in table

Camber per wheel at vehicle level:

AR40.20-S-0322-02SA

 Look up specified values of camber (α) based on measured vehicle level in table sheet and note down. Compare the specified values of camber (α) with the actual values from the wheel alignment check. If the measured value deviates, adjust the camber (α).

Model 639 except code MA0 (E-CELL 60 kW) except code ZG2 (Permanent all-wheel drive)Camber per wheel at vehicle level

*BE40.20-N-1001-13F

Model 639 with code ZG2 (Permanent all-wheel drive)Camber per wheel at vehicle level

*BE40.20-N-1002-13F

Model 639 with code MA0 (E-CELL 60 kW)Camber per wheel at vehicle level

*BE40.20-N-1003-13F

Model 639 with code CF8 (Sports suspension)Camber per wheel at vehicle level

*BE40.20-N-1004-13F

Model 639Permissible difference in front axle camber between right and left sides of the vehicle

*BE40.20-N-1005-13F

Adjust

6

Adjust camber (α) according to tabular value

Camber per wheel at vehicle level

 If not already done so during the previous operations, replace, cam bolt (1), collar bolt (2) and the nuts. To replace the cam bolt (1) and the collar bolt (2) lift up the respective axle half.

 Adjust camber (α) by turning cam bolt (1) to the specified value and then tighten cam bolt (1) and collar bolt (2). Lift up the respective axle half to make torque angle application easier.

Model 639 except code CF8 (Sports suspension) except code MA0 (E-CELL 60 kW) except code ZG2 (Permanent all-wheel drive)Camber per wheel at vehicle level

*BE40.20-N-1001-13F

Model 639 with code ZG2 (Permanent all-wheel drive)Camber per wheel at vehicle level

*BE40.20-N-1002-13F

Model 639 with code MA0 (E-CELL 60 kW)Camber per wheel at vehicle level

*BE40.20-N-1003-13F

Model 639 with code CF8 (Sports suspension)Camber per wheel at vehicle level

*BE40.20-N-1004-13F

Permissible difference in front axle camber between right and left sides of the vehicle

*BE40.20-N-1005-13F

 Nut, suspension strut cam bolt to steering knuckle

*BA32.25-N-1005-04A

 Collar bolt, suspension strut to steering knuckle

*BA32.25-N-1006-04A

7

Adjust front axle toe

AR40.20-S-0323SA

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639 with CODE XZ1, except CODE CF8, except CODE MA0, except CODE ZG2

BE40.20-N-1001-13F

Camber per wheel at vehicle level

+16.4°



+0° 08' (20')

+15.3°



+0° 00' (20')

+14.2°



–0° 07' (20')

+13.2°



–0° 14' (20')

+12.1°



–0° 20' (20')

+11.1°



–0° 26' (20')

+10.1°



–0° 31' (20')

+9.1°



–0° 36' (20')

+8.1°



–0° 41' (20')

+7.1°



–0° 44' (20')

+6.1°



–0° 48' (20')

+5.1°



–0° 50' (20')

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639 with CODE XZ1, with CODE ZG2, except CODE CF8, except CODE MA0

BE40.20-N-1002-13F

Camber per wheel at vehicle level

+10.6°



–0° 07' (20')

+9.6°



–0° 13' (20')

+8.5°



–0° 19' (20')

+7.5°



–0° 24' (20')

+6.5°



–0° 29' (20')

+5.5°



–0° 33' (20')

+4.5°



–0° 37' (20')

+3.5°



–0° 41' (20')

+2.5°



–0° 44' (20')

+1.6°



–0° 46' (20')

+0.6°



–0° 48' (20')

–0.3°



–0° 50' (20')

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639.6/7 with CODE MA0, with CODE XZ1, except CODE CF8, except CODE ZG2

BE40.20-N-1003-13F

Camber per wheel at vehicle level

+12.2°



+0° 10' (20')

+11.1°

v

+0° 02' (20')

+10.1°



–0° 05' (20')

+9.1°



–0° 11' (20')

+8.1°



–0° 17' (20')

+7.1°



–0° 23' (20')

+6.1°



–0° 28' (20')

+5.1°



–0° 32' (20')

+4.1°



–0° 36' (20')

+3.2°



–0° 40' (20')

+2.2°



–0° 43' (20')

+1.3°



–0° 46' (20')

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639 with CODE CF8, with CODE XZ1, except CODE MA0, except CODE ZG2 (Permanent all-wheel drive)

BE40.20-N-1004-13F

Camber per wheel at vehicle level

+14.4°



–0° 02' (20')

+13.3°



–0° 08' (20')

+12.3°



–0° 15' (20')

+11.2°



–0° 21' (20')

+10.2°



–0° 26' (20')

+9.1°



–0° 31' (20')

+8.1°



–0° 35' (20')

+7.1°



–0° 39' (20')

+6.1°



–0° 43' (20')

+5.1°



–0° 46' (20')

+4.1°



–0° 48' (20')

+3.1°



–0° 50' (20')

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639 with CODE XZ1, except CODE CF8, except CODE MA0, except CODE ZG2

MODEL 639 with CODE XZ1, with CODE ZG2, except CODE CF8, except CODE MA0

BE40.20-N-1005-13F

Permissible difference in front axle camber between right and left sides of the vehicle

°

20'

20'

Inspection and adjusting values for front-axle camber

Number

Designation

MODEL 639.6/7 with CODE MA0, with CODE XZ1, except CODE CF8, except CODE ZG2

MODEL 639 with CODE CF8, with CODE XZ1, except CODE MA0, except CODE ZG2 (Permanent all-wheel drive)

BE40.20-N-1005-13F

Permissible difference in front axle camber between right and left sides of the vehicle

°

20'

20'

 Suspension struts

Number

Designation

Model 639 with code XZ1

BA32.25-N-1005-04A

Nut, suspension strut cam bolt to steering knuckle

Stage 1

Nm

150

Stage 2, loosen

°

180

Stage 3

Nm

120

Stage 4

°

75

 Suspension struts

Number

Designation

Model 639 with code XZ1

BA32.25-N-1006-04A

Collar bolt, suspension strut to steering knuckle

Stage 1

Nm

150

Stage 2, loosen

°

180

Stage 3

Nm

120

Stage 4

°

75