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

Model 238 

Courtesy of MERCEDES-BENZ USA

Shown Except Code 489 (AIR BODY CONTROL) 

Courtesy of MERCEDES-BENZ USA

Shown on left side of vehicle Except Code 489 (AIR BODY CONTROL) 

Fig 1: Front Upper Control Arm Components Location - Model 238 (Shown On Left Side Except Code 489)

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 safety-relevant components		AH00.00-Z-0019-01A
	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 (6) on left side	When removing left upper transverse control arm (2).
1.2	Remove cover (6) on right side	When removing right upper transverse control arm (2).
2.1	Remove on-board electrical system battery for 12V on-board electrical system	When removing right upper transverse control arm (2). Model 238 with code U98 (LITHIUM-ION STARTER BATTERY (LISB)) except code B01 (48V technology)	AR54.10-P-0009LWQ
		Model 238 except code B01 (48V technology) except code U98 (LITHIUM-ION STARTER BATTERY (LISB))	AR54.10-P-0009LWO
2.2	Remove on-board electrical system battery for 48V on-board electrical system	When removing right upper transverse control arm (2). Model 238 with code B01 (48V technology)	AR54.10-P-0022LWO
3.1	Unclip coolant reservoir (8)	When removing right upper transverse control arm (2).
3.2	Unscrew nuts (7) and place engine fuse and relay module (K40/8) with connected lines to one side	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	Detach upper transverse control arm (2) from steering knuckle (3)
8	Remove front suspension strut	Model 238 with code 489 (AIR BODY CONTROL)	AR32.25-P-1017LWQ
9	Remove front level sensor retaining clamp (1) from upper transverse control arm (2)	If installed. Pay attention to installation position.
10	Counterhold bolts (10) and unscrew nuts (9)	Nut, transverse control arm to body	*BA33.20-P-1005-01U
11	Unscrew bolts (10) and remove upper transverse control arm (2)
	Check
12	Check elastomer bearing on upper transverse control arm (2) for wear and damage Evaluation of elastomer bearings	If a problem arises ↓ Replace upper transverse control arm (2).	AH00.10-P-0001-01A
13	Check upper ball joint on upper transverse control arm (2) for wear and damage	If a problem arises ↓ Replace upper transverse control arm (2).
14	Check upper transverse control arm (2) for damage	If a problem arises ↓ Replace upper transverse control arm (2).
15	Install in the reverse order