Remove/Install Service Connection On Shock Absorber Of Electrohydraulic Suspension - AR32.50-P-0009-01ME

Model 167

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

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
Topical note	Information on E-ACTIVE BODY CONTROL suspension		AH32.50-P-0002-01ME
	Notes on safety-relevant components		AH00.00-Z-0019-01A

ELECTROHYDRAULIC SUSPENSION

Number	Designation		Model 167 with code 490 (Electrohydraulic suspension)
BA32.50-P-1006-04A	Shutoff valve to shock absorber	Nm	5

ELECTROHYDRAULIC SUSPENSION

Designation				Model 167 with code 490 (Electrohydraulic suspension)
Connection fitting to shock absorber	Stage 1		Nm	10
	Stage 2	(release and tighten again)	Nm	10
	Stage 3	(release and tighten again)	Nm	6

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1030-05A	Preservation agent, 400 ml	A 000 986 32 01

Remove

Screw in shutoff valves (3, 4) up to end stop.
The hydraulic pressure in the shock absorber (7) can only be retained by closing the shutoff valves (3, 4). It is not possible to fill the shock absorbers (7).
Clean area around connection fittings (5, 6).
No dirt is allowed to enter into the system.

Otherwise, the shock absorbers (7) may be damaged.
Release connection fittings (5, 6) until the first drops of hydraulic fluid escape.
Do not completely unscrew connection fittings (5, 6).

Otherwise, the hydraulic fluid may escape in an uncontrolled manner.

Courtesy of MERCEDES-BENZ USA

Collect escaping hydraulic fluid using suitable container.
Wait until hydraulic fluid no longer runs out and a system pressure of zero bar is shown in the diagnostic system.
Remove connection fittings (5, 6).
Install
Screw connection fittings (5 6) into shock absorber (7).
The shutoff valves (3, 4) are opened during the filling process for the system's hydraulic pressure lines.
Clean area around connection fittings (5, 6) again.
Apply preservation agent in area around shutoff valves (3, 4) and connection fittings (5, 6).
Ensure that preservation agent does not enter into connection fittings (5, 6).

Shown on shock absorber (7) of rear axle