Remove/install Active Body Control hydraulic pump - AR32.50-P-0030MMB

MODEL 216, 221 with ENGINE 157, 278 

Fig 1: Identifying Active Body Control Hydraulic Pump Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of injury  to skin or eyes caused by hydraulic fluid spraying out under high pressure. Risk of poisoning  caused by swallowing hydraulic fluid	Depressurize the hydraulic system completely before starting any work on the system. Wear protective clothing and safety glasses.	AS00.00-Z-0013-01A
	Notes on Active Body Control suspension		AH32.50-P-0001-01N
	Notes on fitting hydraulic lines and hoses		AH32.50-P-0001-02A
		Before starting work the area around the hydraulic pump (ABC) (3) must be thoroughly cleaned at the separation points. Even the smallest dirt particles in the hydraulic components can lead to malfunctions and a total failure of the suspension system.
		It is essential to ensure the utmost cleanliness throughout the entire procedure as even the smallest dirt particles in the hydraulic components of the suspension system can lead to malfunctions and a total failure of the ABC system.
		Always observe the work procedure; failure to do so will cause damage and thus result in total failure of the ABC system.
		When the work has been completed, cooling of the hydraulic fluid (after the engine is switched off) will cause the body to be lowered.
1	Open engine hood
2	Remove upper engine cover
3	Remove charge air ducts (1)		AR09.41-P-8620MMB
4	Suction off oil from expansion reservoir (ABC) (10)		Figure
5	Detach poly-V belt (2) from hydraulic pump (ABC) (3)		AR13.20-P-0001MMB
6	Detach charge air cooler vent line (4) from bracket (5) of hydraulic pump (ABC) (3)
7	Disconnect electrical connector at ABC intake throttle valve, unclip at bracket (5) and set aside
8	Detach feed line (ABC) (6) from cylinder head cover and front cover
9	Detach feed line (ABC) (6) between hydraulic pump (ABC) (3) and expansion reservoir (ABC) (10) from hydraulic pump (ABC) (3) and set aside	Seal openings using stop plugs.
			Figure
10	Detach pressure line (ABC) (7) from hydraulic pump (ABC) (3) to valve unit at hydraulic pump (ABC) (3)	Detach pressure line (ABC) (7) at the earliest 10 minutes after switching off the engine as only then is the ABC system completely unpressurized. Seal openings using stop plugs. Replace sealing rings of pressure line (7).
			*BA32.50-P-1007-02B
			Figure
11	Remove screws (8) of hydraulic pump (ABC) (3) from timing case cover and cylinder crankcase, remove hydraulic pump (ABC) (3) upwards		*BA13.25-P-1003-01Y
12	Detach bracket (5) from hydraulic pump (ABC) (3)	When replacing hydraulic pump (ABC) (3)
13	Detach protective cap and detach belt pulley (9) from hydraulic pump (ABC) (3)	When replacing hydraulic pump (ABC) (3)
14	Install in the reverse order
15	Fill and bleed active body control (ABC)		AR32.50-P-0021SX
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
16	Carry out engine test run, while doing so check Active Body Control (ABC) for proper operation and leaktightness

ACTIVE BODY CONTROL, LINES

Number	Designation		Model 216	Model 221
BA32.50-P-1007-02B	Bolt, high-pressure line to ABC pump	Nm	9	9

BELT TENSIONING DEVICE

Number	Designation		Engine 157	Engine 278
BA13.25-P-1003-01Y	Bolt, guide pulley carrier/ABC pump to timing case cover/coolant pump	Nm	20	20

Fig 2: Identifying Set Of Stop Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Hand Pump (210 589 00 71 00)

Courtesy of MERCEDES-BENZ USA