Remove/Install Left Trailer Hitch Longitudinal Member - AR31.30-P-0005MFD

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Model 118, 177.0/1, 247 with code 550 (Trailer coupling)

MODIFICATION NOTES

10.01.2020

Remove all-wheel drive control unit (N15/17).

Operation step 3.1.

Courtesy of MERCEDES-BENZ USA

Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Notes on installing a trailer hitch		AH31.10-P-1000-02CW
	Remove/install
1	Remove trailer hitch (1).	Align trailer hitch (1).	AR31.10-P-8000MFA
2	Remove nuts (3).	Tighten nuts (3) only after the trailer hitch (1) has been aligned. Nut, longitudinal member reinforcement for trailer hitch to body	*BA31.11-P-1002-01K
3.1	Remove all-wheel drive control unit (N15/17) with lines still connected and place to one side.	Model 177.0, 247.0/7 with code 550 (Trailer coupling) with code M005 (Vehicles with 4MATIC/allwheel drive) Model 177.0, 247.0/7 with transmission 724.1 with code 550 (Trailer coupling) with code M005 (Vehicles with 4MATIC/allwheel drive)	AR27.19-P-1720MFA
		Model 177.0, 247.0 with transmission 724.0 with code 550 (Trailer coupling) with code M005 (Vehicles with 4MATIC/allwheel drive) Do not crush or kink or subject electric lines to tension. This will result in damage to the electric lines and can impair their function. Install all-wheel drive control unit (N15/17) only after screw (5) is tightened.	AR27.19-P-1720MFC
3.2	Remove spare wheel well trim.	Model 247.6 with code 550 (Trailer coupling) Install spare wheel well trim only after screw (5) is tightened.
4	Remove screw (5).	Tighten screw (5) only after trailer hitch (1) has been aligned. Screw/bolt, longitudinal member reinforcement for trailer hitch to body	*BA31.11-P-1003-01K
5	Remove left longitudinal member (7) of trailer hitch (1).
6	Install in the reverse order.
	Check
7	Check function of trailer hitch (1) with electrical release.		AR31.19-P-1451MFA
8	Check function of lighting signals on trailer hitch mains outlet (1).

TRAILER COUPLING MECHANISM

Number	Designation		Model 118, 177, 206, 243, 247
BA31.11-P-1002-01K	Nut, longitudinal member reinforcement for trailer hitch to body	Nm	55

TRAILER COUPLING MECHANISM

Number	Designation		Model 118, 177, 206, 243, 247
BA31.11-P-1003-01K	Screw/bolt, longitudinal member reinforcement for trailer hitch to body	Nm	140