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Remove/Install Trailer Hitch - AR31.10-P-8000LWG

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Model 253.3/9 

with code 550 (Trailer coupling) 

MODIFICATION NOTES

14.10.2019 Bolt, trailer hitch to longitudinal member reinforcement (short)   BA31.11-P-1001-01M
G14470855Courtesy of MERCEDES-BENZ USA

Model 253.354/954 

G14470856Courtesy of MERCEDES-BENZ USA

Model 253.354/954 

G14470857Courtesy of MERCEDES-BENZ USA
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer. AS00.00-Z-0010-01A
DANGER Risk of death  when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC) Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines. AS00.00-Z-0035-01A
WARNING Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof. No parts of the body or limbs should be within the operating area when the components are moving. AS00.00-Z-0011-01A
Notice  Notes on self-locking nuts and bolts   AH00.00-P-0001-01KOA
Notice  General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment   AH00.00-Z-0300-01A
  Notes on HANDS-FREE ACCESS Model 253.3/9
with code 550 (Trailer coupling)
with code 871 (Sensor system for trunk lid opening/closing)
with code 889 (KEYLESS-GO)
AH80.61-P-0001-01A
REMOVING Remove     
1 Switch off ignition and store transmitter key outside of transmission range (at least 2 m)    
2 Fold up load compartment floor and secure against unintended folding down    
3 Remove rear bumper   AR88.20-P-2200LWG
4 Fold load compartment well trim to one side    
5 Disconnect trailer hitch wiring harness from trailer recognition control unit and from vehicle interior/trailer hitch electrical connection Model 253.3/9
with code 550 (Trailer coupling)
except code 460 (Canada version)
except code 494 (US version)
except code 737L (Mexico)
AR31.19-P-1400LWG 
    Model 253.3/9
with code 460 (Canada version)
with code 550 (Trailer coupling)
Model 253.3/9
with code 494 (US version)
with code 550 (Trailer coupling)
Model 253.3/9
with code 550 (Trailer coupling)
with code 737L (Mexico)
AR31.19-P-1400LWH 
WARNING Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
6 Unfasten rubber retainers on rear muffler    
7 Remove screws/bolts (13) and remove crossmember (1) IMPORTANT Helper required.  
8 Remove bolts (5) of longitudinal member reinforcements (2, 3)    
9 Unscrew nuts (15) of longitudinal member reinforcements (2, 3)    
10 Remove longitudinal member reinforcements (2, 3)    
11 Remove screws/bolts (4) of longitudinal member reinforcements (6, 7) Model 253.354/954
with code 550 (Trailer coupling)
 
12 Remove longitudinal member reinforcements (6, 7) Model 253.354/954
with code 550 (Trailer coupling)
 
INSTALLING Install     
13 Insert longitudinal member reinforcements (6, 7) Model 253.354/954
with code 550 (Trailer coupling)
 
14 Screw in screws/bolts (4) of longitudinal
member reinforcements (6, 7) slightly by hand
Model 253.354/954
with code 550 (Trailer coupling)
 
15 Insert longitudinal member reinforcements (2, 3)    
16 Screw in screws/bolts (5) slightly by hand    
17 Screw on nuts (15) slightly by hand    
18 Position crossmember (1) onto longitudinal member reinforcements (2, 3) and tighten screws/bolts (13) slightly by hand IMPORTANT Helper required.  
19.1 Align longitudinal member reinforcements (2, 3) and crossmember (1) so that they are free of tension Model 253.3 (except 253.354), 253.9 (except 253.954)
with code 550 (Trailer coupling)
 
19.2 Align longitudinal member reinforcements (2, 3, 6, 7) and crossmember (1) so that they are free of tension Model 253.354/954
with code 550 (Trailer coupling)
 
20 Tighten bolts (4) Model 253.354/954
with code 550 (Trailer coupling)
TORQUE SPECIFICATION Bolt, longitudinal member reinforcement for trailer hitch (long) to body
*BA31.11-P-1003-01M 
21 Tighten nuts (15) TORQUE SPECIFICATION Longitudinal member reinforcement for trailer hitch (short) to body *BA31.11-P-1002-01M 
22 Screw bolts (5) tight TORQUE SPECIFICATION Longitudinal member reinforcement for trailer hitch (short) to body *BA31.11-P-1002-01M 
23 Tighten screws (13) TORQUE SPECIFICATION Bolt, trailer hitch to longitudinal member reinforcement (short) *BA31.11-P-1001-01M 
WARNING Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
24 Secure rubber retainers of rear muffler    
25 Connect trailer hitch wiring harness to trailer recognition control unit and to vehicle interior/trailer hitch electrical connection Model 253.3/9
with code 550 (Trailer coupling)
except code 460 (Canada version)
except code 494 (US version)
except code 737L (Mexico)
AR31.19-P-1400LWG 
    Model 253.3/9
with code 460 (Canada version)
with code 550 (Trailer coupling)
Model 253.3/9
with code 494 (US version)
with code 550 (Trailer coupling)
Model 253.3/9
with code 550 (Trailer coupling)
with code 737L (Mexico)
AR31.19-P-1400LWH 
26 Fold back load compartment well trim    
27 Install rear bumper   AR88.20-P-2200LWG
28 Fold down load compartment floor    
INSPECT Check     
29 Perform function test on ball neck and on light signals at trailer socket    
REFER TO RETROFITTING AND CONVERSION     AN31.10-P-0008-01LWG 
TRAILER COUPLING MECHANISM

Number Designation Model 253
BA31.11-P-1001-01M Bolt, trailer hitch to longitudinal member reinforcement (short) M12 Nm 120
TRAILER COUPLING MECHANISM

Number Designation Model 253
BA31.11-P-1002-01M Longitudinal member reinforcement for trailer hitch (short) to body Nut M12 Nm 120
Bolt M12 Nm 125
TRAILER COUPLING MECHANISM

Number Designation Model 253
BA31.11-P-1003-01M Bolt, longitudinal member reinforcement for trailer hitch (long) to body M10 Nm 70