Fill power steering pump and bleed - AR46.30-P-0010V

MODEL 171.442 with ENGINE 271.944 

MODEL 171.454 with ENGINE 272.942 

MODEL 171.456 with ENGINE 272.963 

MODEL 171.473 with ENGINE 113.989 

Illustrated on model 171.442 

Fig 1: Identifying Power Steering Reservoir

Courtesy of MERCEDES-BENZ USA

Shown on model 171.456 

Fig 2: Identifying Power Steering Reservoir And Left Intake Air Duct Shown On Model 171.456

Courtesy of MERCEDES-BENZ USA

	Remove/install
	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.	-
	Risk of injury  caused by fingers being pinched or crushed  when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	-
1	Hoist vehicle with lifting platform until wheels are free		AR00.60-P-1000V
2	Remove the left intake air duct (2)	Model 171.454/ 456 /473
3	Remove cap on expansion reservoir (1)	Press the cap downwards and turn counterclockwise through 90°.
	Charging
4	Fill expansion reservoir (1) with MB steering gear oil	Do not start the engine!  If the engine is started there is the danger that air gets into the hydraulic steering system which cannot be removed without taking further action. Fill the expansion reservoir (1) of the power steering to approx. 10 mm below the upper edge of the reservoir with MB steering gear oil Add MB steering gear oil continuously, until the oil level remains constant.
			*BF46.20-P-1001-01A
	Bleeding
5	Turn steering wheel from steering stop to steering stop	Do not start the engine!  If the engine is started there is the danger that air gets into the hydraulic steering system which cannot be removed without taking further action. Turn steering wheel slowly from steering stop to steering stop until no more bubbles are ascertained in the expansion reservoir (1) Repeat turning the steering from stop to stop several times (up to 30 times). During this process, MB steering gear oil must be poured into the expansion reservoir (1) by a second person.
	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 running engine	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	-
6	Start engine without moving the steering	Allow the engine to run for approx. 1 minute at idle speed. During this process, a second person must observe the oil level in the expansion reservoir (1) and add MB steering gear oil if necessary.
7	Turn steering wheel from steering stop to steering stop	When the engine is running turn the steering wheel slowly several times from steering stop to steering stop, meanwhile add MB steering gear oil to the expansion reservoir (1) Repeat the procedure until the oil level in the expansion reservoir (1) remains constant and bubbles are no longer visible.
	Checking
8	Check oil level in the expansion reservoir (1) and fill up to the maximum fill level	The oil level in the expansion reservoir (1) must always be filled up to the maximum.
	Power steering - checking and correcting oil level		AP46.00-P-4611V
9	Check the steering system for leaks and proper operation when the engine is running	In the event of leakage, find and eliminate cause.
10	Install in the reverse order