Check condition and operation of trailer hitch · ap3111p3152e · Mercedes-Benz WIS

AP31.11-P-3152E

Check condition and operation of trailer hitch

22.02.2019

Model	164
	with code 553 (Trailer coupling, manually folding)
	except code 849 (Spare wheel carrier)

Check condition and operation of trailer hitch

1	Telescopic lever
1a	Indicator lamp
2	Ball neck
2k	Ball head
3	Unlocking line
4	Swivel mechanism
X58	Trailer hitch socket (13-pin)

P31.11-2317-06

	Check
1	Open lower stowage compartment in trunk.
2	Pull telescopic lever (1) forwards, then upwards.	 The ball neck (2) unlocks and folds out below the rear bumper.
3	Check function of indicator lamp (1a).	 The indicator lamp (1a) must flash when the ball neck (2) is disengaged.
4	Move telescopic lever (1) back again.
5	Push ball neck (2) upwards by hand until it engages in the vertical position, and check indicator lamp (1a) for proper operation.	 The ball neck (2) must engage and lock in the vertical position, the indicator lamp (1a) must go out.
	Clean
6	Remove cover of ball head (2k) and clean ball head (2k).	 Do not use any high pressure or steam cleaning equipment nor any solvent or cleaning agent.
		 Clean ball head (2k) using water and a brush, then dry off with a lint-free rag.
		 Remove corrosion from ball head (2k) using wire brush.
	Measure
7	Measure diameter of ball head (2k).	Minimum diameter of ball head	*BE31.11-P-1001-01A
		If the diameter of the ball head (2k) is below the minimum,
		
		Replace ball neck (2).
		 After obtaining special order.
8	Lightly grease ball head (2k).	 Inform the customer that when using trailers with an anti-swerve device whose effect is based on friction with the ball head (2k), the ball head (2k) must be degreased before the trailer is coupled. Otherwise the friction between the friction linings and the ball head (2k) is reduced, and the swerving and pitch motions are no longer suppressed.
		 Inform the customer that after using trailers with an anti-swerve device whose effect is based on friction with the ball head (2k), the ball head (2k) must be greased again.
		MB multipurpose grease, 5 kg	*BR00.45-Z-1034-06A
9	Attach cover to ball head (2k).
10	Check 13-pin trailer hitch socket (X58), unlocking line (3) and swinging mechanism (4).	 Check 13-pin trailer hitch socket (X58) for damage and also check unlocking line (3) and swinging mechanism (4) for leaks.
		If problems occur,
		
		rectify the problems.
		 After obtaining special order.
11	Pull telescopic lever (1) forwards, then upwards.	 The ball neck (2) disengages and swings downward.
12	Move telescopic lever (1) back again.
13	Swing ball neck (2) behind bumper.	 The ball neck (2) must disengage and lock behind the bumper, the indicator lamp (1a) must go out.
14	Switch on ignition and perform visual inspection of multifunction display.	 When the ball neck (2) is engaged, no error message should appear in the multifunction display.

Check values for trailer hitch

Number	Designation		Model all (4xWD, CAR, Light transporter, smart)
BE31.11-P-1001-01A	Minimum diameter of ball head	mm	49

Repair materials

Number	Designation	Order number
BR00.45-Z-1034-06A	MB multipurpose grease, 5 kg	A 001 989 34 51 10