Remove/Install Power Steering Pump - AR46.30-P-0500RD

Model 172 with engine 274

Model 172 with engine 276, 651

as of model year 2016

Shown on engine 651

Fig 1: Power Steering Pump Components Location - Model 172 With Engine 276 As Of Model Year 2016 (Shown On Engine 651)

Courtesy of MERCEDES-BENZ USA

	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
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Clean area surrounding area before opening the hydraulic system at the connecting points
2	Extract oil from Power steering Expansion reservoir	Hand pump	Fig 3
3.1	Remove lower engine compartment paneling	Model 172 with engine 274 Model 172 with engine 276 as of model year 2016	AR61.20-P-1105W
3.2	Detach bottom part of soundproofing	Model 172 with engine 651 as of model year 2016	AR94.30-P-5300W
			AP40.10-P-4050V
	4	Remove right front wheel
5	Remove right wheel well liner in fender		AR88.10-P-1300W
6	Detach electrical connections (8) from electrohydraulic Power steering pump (1)
7	Detach feed hose (5) from electrohydraulic Power steering pump (1)	Collect escaping oil using a rag.
8	Seal connections with stop plugs	Record plug	Fig 2
9	Detach Pressure line (2), to do so remove Bolt (3)	Collect escaping oil using a rag. Bolt, Pressure line to Power steering pump (EHPS)	*BA46.30-P-1018-01R
10	Seal connections with stop plugs	Record plug	Fig 2
11	Remove Bolts (4), then remove electrohydraulic Power steering pump (1)	Bolt, bracket to bracket for Power steering pump (EHPS)	*BA46.30-P-1028-01R
12	Detach bracket (6) from electrohydraulic Power steering pump (1), to do so, remove Bolts (9)	Only when replacing the electrohydraulic Power steering pump (1). Bolt, bracket for Power steering pump to Power steering pump (EHPS)	*BA46.30-P-1029-01R
13	Install in the reverse order
14	Fill and bleed electrohydraulic Power steering pump (1)		AR46.30-P-0010RD
15	Read out fault memory using diagnostic system, delete if necessary and check electrohydraulic Power steering pump (1) for the latest flashware	Only when replacing the electrohydraulic Power steering pump (1).
			AD00.00-P-2000-04A
	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
16	Test-run engine and check steering system for leaks and proper operation