Trailer coupling - Check function, play and attachment

AP31.10-D-3151A

Trailer coupling - Check function, play and attachment

11.12.2017

Model

901, 902, 903, 904, 905, 906.1/2/6/7

with code Q20 (Trailer hitch (jaw-type))

1

Safety knob

2

Coupling bolt

3

Handlever



Check

1

Pull out safety knob (1)

2

Lift coupling bolt (2) using handlever (3)

 The coupling bolt (2) must be locked automatically in the raised position.

3

Use a suitable tool to press the coupling bolt (2) upwards

 The coupling bolt (2) should then be released from its catch and latch into the lower bearing bore. When the coupling bolt (2) has reached the bottom position, the automatic safety mechanism must be operational.

 The safety knob (1) must abut completely with the retaining sleeve (arrow).

4

Using a suitable tool, push coupling bolts (2) upwards when trailer hitch is closed

 The permissible vertical clearance must not be exceeded.

Coupling bolt

*BE31.10-N-1001-01A

Side clearance is exceeded.



Replace trailer hitch subject to separate repair order.

5

Measure the coupling bolt (2)

Measure in the longitudinal direction or transverse direction on the crowned part using a vernier caliper or gauge.

 The minimum dimension must not be dropped below or the gauge must not slide over it. Gauges are available from the manufacturer of the trailer hitch.

Coupling bolt

*BE31.10-N-1001-01A

Minimum dimension is undercut.



Replace trailer hitch subject to separate repair order.

6

Check trailer hitch is properly mounted

 Check bolts for trailer hitch to crossmember and crossmember on frame are firmly seated.

Check values of trailer hitch

Number

Designation

MODEL 901, 902, 903, 904, 905 Rockinger trailer hitch, model 243

MODEL 906 with CODE Q20 Rockinger trailer hitch, model 243

BE31.10-N-1001-01A

Coupling bolt

Vertical clearance

mm

2,0

2,0

Minimum diameter

mm

36,5

36,5