Remove/install rack-and-pinion steering - AR46.20-P-0600M

MODEL 220.176/ 179 

Fig 1: Identifying Rack-And-Pinion Steering Remove/Install Components - Model 220.176/179

MODIFICATION NOTES

15.12.05

Set toe on front axle only after installing new parts

Step 27.1

	Removing
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	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
	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
	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.
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Evaluating steering rack when repairing accident vehicles		AH46.20-P-9409-01A
1	Deactivate easy entry/exit function	Otherwise the driver seat and steering wheel move into a different position if the driver door is opened or closed for example. Damage to the upper frame can occur when the holding device is installed. Disabling takes place via the buttons on the steering wheel in the "comfort" menu of the multifunction display, see vehicle-operator's manual.
2	Turn steering wheel to center position (front wheels in straight-ahead position) and fix in place with holding device	On a disengaged steering coupling (25) the steering wheel should not be turned because the spiral contact coil will be destroyed. m Retainer
3	Open engine hood
4	Suction off oil from expansion reservoir of power steering	m Hand pump
5	Lift vehicle on lifting platform.
6	Remove front wheels
	Remove and install wheels		AP40.10-P-4050Z
7	Remove lower engine compartment paneling		AR61.20-P-1105M
8	Press tie rod joints (10a) off steering knuckles		AR46.40-P-0200-02I
		Thrust piece	Figure
		Puller	Figure
9	Remove steering coupling (25)		AR46.10-P-8000I
10	Undo bolts (23a) for retaining plate (1g) on front axle carrier (1)
11	Undo bolts (23g) and remove retaining plate (1g)
12	Remove high-pressure expansion hose (30i) and return line (30f)	Seal off line connections with plugs.
		Set of plugs	Figure
13	Remove rack-and-pinion steering (23)	Check rubber mount (21) of rack-and-pinion mounting for signs of damage and replace if necessary: ↓
		Remove rubber mounts (21) on rack-and-pinion steering mounting	AR46.20-P-0600-02I
	Install
14	Clean bolts, nuts and contact surfaces	The bolts (23a, 23g), nuts and contact surfaces of the retaining plate (1g) and front axle carrier (1) must be free of oil, grease and preservative. Under exposure to heat the lubricants can liquify, allowing bolts and nuts to loosen.
15	Push new locking plate with self-locking nut onto steering coupling (25)
16	Insert rack-and-pinion steering (23)
17	Turn rack-and-pinion steering (23) to center position		AR46.20-P-0600-01I
18	Install steering joint (25)	Do not install engine compartment paneling.	AR46.10-P-8000I
19	Attach return line (30f)	Replace sealing ring.
			*BA46.20-P-1001-01E
20	Attach high-pressure expansion hose (30i)	Replace sealing ring.
			*BA46.20-P-1002-01E
21	Mount rack-and-pinion steering (23) and support bracket (1g) onto front axle carrier (1) using bolts (23a, 23g)	The bolts (23a, 23g), nuts and contact surfaces of the retaining plate (1g) and front axle carrier (1) must be free of oil, grease and preservative. When exposed to heat the lubricants can liquify, allowing bolts and nuts to loosen.
		Rack-and-pinion steering to retaining plate	*BA46.20-P-1003-01E
		Bracket to front axle carrier	*BA46.20-P-1004-01E
22	Attach tie rod joints (10a) to steering knuckles		AR46.40-P-0200-02I
			*BA46.40-P-1001-01E
23	Remove retainer from steering wheel	Retainer	Figure
24	Fill power steering pump and bleed		AR46.30-P-0010N
25	Check steering for function and leaks	There is a grease cushion under the cover cap. A slight escape of grease is to be regarded as normal and is not to be confused with leakage.
26	Mount front wheels
	Remove/install wheels, rotate if necessary		AP40.10-P-4050Z
27.1	Check front axle toe and adjust if necessary	When installing new parts. see: ↓
		Perform chassis alignment	AR40.20-P-0200I
28	Install lower engine compartment paneling		AR61.20-P-1105M
29	Close engine hood		AR88.40-P-1000M
30	Active assisted entry and exit feature

STEERING GEAR

Number	Designation			Model 220.025/026/ 028/063/065/ 067/070/073/ 074/075/125/ 126/128/163/ 165/167/170/ 173/174/175/ 176/178/179/ 875/878
BA46.20-P-1001-01E	Return pipe to rack-and-pinion steering		Nm	45
BA46.20-P-1002-01E	High-pressure stretch hose to rack-and-pinion steering		Nm	40
BA46.20-P-1003-01E	Bolted connection, rack-and-pinion steering to retaining plate	Stage 1	Nm	70
		Stage 2	∠°	90
BA46.20-P-1004-01E	Bolted connection, supporting plate to front axle carrier	Stage 1	Nm	110
		Stage 2	∠°	-

TIE ROD

Number	Designation			Model 220 except model 220.083/ 084/087/ 183/184/ 187
BA46.40-P-1001-01E	Self-locking nut, tie rod to steering knuckle	Stage 1	Nm	50
		Stage 2	∠°	60

Fig 2: Retainer (129 589 01 21 00)

Fig 3: Set Of Stop Plugs (129 589 00 91 00)

Fig 4: Thrust Piece (140 589 00 63 00)

Fig 5: Puller (124 589 03 33 00)

Fig 6: Hand Pump (210 589 00 71 00)