Remove/Install Front Suspension Strut - AR32.25-P-1017MEH

Model 167 

with code 489 (AIRMATIC Dual Control/semi-active air suspension) 

with code 490 (Electrohydraulic suspension) 

Fig 1: Front Suspension Strut Components Location - Model 167 With Code 489; 490 (Shown On Left Side With Code 490)

Courtesy of MERCEDES-BENZ USA

Shown on left side of vehicle with code 490 (Electrohydraulic suspension) 

	Risk of injury  to skin or eyes from hydraulic fluid spraying out under pressure. Risk of poisoning from swallowing hydraulic fluid.	Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses.	AS00.00-Z-0013-01A
	Risk of injury  caused by pinching or crushing when working on springs or spring bodies that are under tension	Use only approved tensioning devices; additionally screen off hazardous area if necessary. Check special tools for damage and proper operation (visual inspection). Wear protective gloves.	AS00.00-Z-0001-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
	Information on E-ACTIVE BODY CONTROL suspension		AH32.50-P-0002-01ME
	Notes on air suspension		AH32.22-P-1000-01T
	Evaluation of elastomer bearings		AH00.10-P-0001-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Notes on repair work on suspension components		AH00.00-P-0100-01A
	Remove/install
1	Remove front left or right wheel and tire assembly.		AR40.10-P-1102ME
2	Transfer the pneumatic pressure of suspension strut (1) into the central reservoir using the diagnostic system.
			AD00.00-P-2000-06ME
		The complete wheels must not touch the ground. Otherwise, suspension strut (1) may suffer initial damage and malfunction at a later stage Select menu item "Actuations" in active suspension and damping system control unit. Transfer pneumatic pressure out of the central reservoir into suspension strut (1) using the diagnostic system.
3	Empty hydraulic pressure lines (4) of electrohydraulic suspension using guided diagnosis.	The complete wheels must not touch the ground. Otherwise, suspension strut (1) may suffer initial damage and malfunction at a later stage. It is essential for shutoff valves on suspension strut (1) to be closed.	AR32.50-P-0042ME
4	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
5	Remove covers over suspension strut (1) at top.
6	Detach pneumatic pressure line (2) at suspension strut (1) and seal openings with suitable stop plugs.	Do not stretch, crush or kink pneumatic pressure line (2). This will result in damage to pneumatic pressure line (2) and can impair its function. Before beginning repair work, clean the area around the pneumatic pressure line connections. Do not use any cleaning agents or solvents.
		Air suspension pressure line at suspension strut at front	*BA32.22-P-1005-03B
		Box wrench bit	Fig 5
		Record plug	Fig 2
		Socket wrench bit	Fig 3
7	Detach hydraulic pressure lines (4) of electrohydraulic suspension at suspension strut (1).		AR32.50-P-0044ME
8	Remove nuts (3) at top from suspension strut (1).	Nut, shock absorber on front end	*BA32.25-P-1001-01O
9	Place electrical wiring harness to one side.
10	Unhook front level sensor at upper transverse control arm (7).		AR82.10-P-0006ME
11	Release electrical connectors (5), disconnect and remove from suspension strut (1).	The number of electrical connectors (5) varies depending on the vehicle equipment.
12	Remove electric lines from suspension strut (1).	Do not crush or kink or subject electric lines to tension. This will result in damage to the electric lines and can impair their function.
13	Detach holder (12) from suspension strut (1) and place electrical wiring harnesses and hydraulic pressure lines (4) to one side.	Do not stretch, crush or kink front hydraulic pressure lines (4). This will result in damage to the front hydraulic pressure lines (4) and can impair their function.
		The design of the bracket (12) varies depending on the vehicle equipment.
14	Remove tie rod from steering knuckle (8).		AR46.40-P-0200ME
15	Release front axle shaft from steering knuckle (8).	Model 167 with engine 176, 177, 256.9 with code 489 (AIRMATIC Dual Control/semi-active air suspension) with code 490 (Electrohydraulic suspension) Model 167 with engine 264 with code 489 (AIRMATIC Dual Control/semi-active air suspension) with code 490 (Electrohydraulic suspension) with code M005 (Vehicles with 4 mATIC/all-wheel drive)	AR33.30-P-0620MSC
		Model 167 with engine 654.9, 656 with code 489 (AIRMATIC Dual Control/semi-active air suspension) with code 490 (Electrohydraulic suspension)	AR33.30-P-0620OID
16	Remove nut (6) from upper transverse control arm (7).	Self-locking nut, upper ball joint out of upper transverse control arm to steering knuckle	*BA33.20-P-1001-01W
17	Detach upper transverse control arm (7) from steering knuckle (8).
18	Secure suspension strut (1) using suitable means to prevent it from falling down.
19	Unscrew nut (9) and remove screw (11).	Self-locking nut, shock absorber to wishbone	*BA32.25-P-1002-01O
20	Push steering knuckle (8) downward and remove suspension strut (1).	Helper required.
	Check
21	Check pneumatic pressure line (2) and pneumatic pressure line connection at top of suspension strut (1) for damage.	If there is a problem, ↓ repair corresponding component part.	AR32.22-P-2001-01ME
		Air suspension pressure line at suspension strut at front	*BA32.22-P-1005-03B
		Box wrench bit	Fig 6
		Knife	Fig 4
		Box wrench bit	Fig 5
		Socket wrench bit	Fig 3
22	Check hydraulic pressure lines (4) of electrohydraulic suspension at suspension strut (1) for damage.	If there is a problem, ↓ replace corresponding hydraulic pressure lines (4).	AR32.50-P-0044ME
23	Check elastomer bearing in lower control arm (10) for wear and damage.	If there is a problem, ↓ Replace elastomer bearing.	AR32.25-P-0107MEH
24	Check suspension strut (1) for damage.	If there is a problem, ↓ replace suspension strut (1).
25	Install in the reverse order.

Fig 2: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Socket Wrench Bit (211 589 00 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Knife (000 589 12 28 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Box Wrench Bit (001 589 00 03 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Box Wrench Bit (000 589 75 03 00)

Courtesy of MERCEDES-BENZ USA