Remove/Install Upper Control Arm - AR33.20-P-0500FR

Model 257 

Shown on left side of vehicle except code 489 (AIRMATIC) 

Fig 1: Upper Control Arm Component Location - Model 257 (Shown On Vehicle Except Code 489)

Courtesy of MERCEDES-BENZ USA

Shown on left side of vehicle 

Courtesy of MERCEDES-BENZ USA

Shown on right side of vehicle 

Courtesy of MERCEDES-BENZ USA

Notice	Notes on handling, transport and storage of composite brake disks		AH42.10-P-9406-12LF
Notice	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
	Notes on repair work on suspension components		AH00.00-P-0100-01A
	Note on calculation of tightening torque when using insertion or socket tools with various effective lengths		AH00.00-P-0015-01CW
	Remove/install
1.1	Remove cover (5).	When removing right upper transverse control arm (2).
1.2	Remove the cover (6).	When removing left upper transverse control arm (2).
2.1	Remove on-board electrical system battery.	Model 257 except code B01 (48V technology) When removing right upper transverse control arm (2).
		Model 257 with code U98 (LITHIUM-ION STARTER BATTERY (LISB)) except code B01 (48V technology)	AR54.10-P-0009FRX
		Model 257 except code B01 (48V technology) except code U98 (LITHIUM-ION STARTER BATTERY (LISB))	AR54.10-P-0009FR
2.2	Remove on-board electrical system battery for 48 V on-board electrical system.	Model 257 with code B01 (48V technology) When removing right upper transverse control arm (2).	AR54.10-P-0022FR
3.1	Remove coolant reservoir (8) with connected lines and place to one side.	When removing right upper transverse control arm (2).
3.2	Remove engine fuse and relay module (K40/8) and place to one side with connected lines.	When removing left upper transverse control arm (2).
4	Remove front wheel.		AR40.10-P-1102A
5	Secure steering knuckle (3) against falling down.
6	Unscrew nut (4).	Counterhold the ball head and do not use an impact wrench/driver. Otherwise the ball head or steering knuckle (3 may be damaged.
		Nut, steering knuckle to transverse control arm	*BA33.20-P-1006-01U
7	Remove upper transverse control arm (2) from steering knuckle (3).
8	Remove front suspension strut.	Model 257 with code 489 (AIR BODY CONTROL)	AR32.25-P-1017FRA
9	Remove front left level sensor retaining clamp (1) from upper transverse control arm (2).	Pay attention to installation position.
10	Remove front right level sensor retaining clamp from upper transverse control arm (2).	Model 257 with code 489 (AIR BODY CONTROL)
11	Push cable duct (11) slightly to one side.	When removing right upper transverse control arm (2).
12	Counterhold screws (10) and unscrew nuts (9).	Nut, transverse control arm to body	*BA33.20-P-1005-01U
13	Remove bolts (10).
14	Remove upper transverse control arm (2).
	Check
15	Check elastomer bearings at upper transverse control arm (2) for wear and damage. Evaluation of elastomer bearings		AH00.10-P-0001-01A
		In the event of a problem, ↓ Replace upper transverse control arm (2).
16	Check upper ball joint at upper transverse control arm (2) for wear and damage.	In the event of a problem, ↓ Replace upper transverse control arm (2).
17	Check upper transverse control arm (2) for damage.	In the event of a problem, ↓ Replace upper transverse control arm (2).
18	Install in the reverse order.