Trailer coupling - Check function, play and attachment

AP31.10-D-3151TS

Trailer coupling - Check function, play and attachment

05.03.2018

Model

907

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

1

Safety knob

2

Coupling bolt

3

Hand lever

4

Gauge



Check

1

Pull out safety knob (1)

2

Lift up coupling bolt (2) using handlever (3)

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

3

Push coupling bolt (2) upwards using suitable tool

 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 snap button (1) must make full contact with the retaining sleeve (arrow A).

4

Push coupling bolt (2) upwards using suitable test with closed trailer coupling

 The permissible vertical clearance must not be exceeded.

Coupling bolt

*BE31.10-N-1001-01A

If side clearance is exceeded



Replace trailer hitch subject to separate repair order.

5

Measure coupling bolt (2)

 Measure on crowned part (arrows B) using vernier caliper or gauge (4) in longitudinal and transverse direction.
The minimum dimension must not be dropped below or the gauge (4) must not slide over it. Gauges (4) can be procured from the trailer coupling manufacturer.

Coupling bolt

*BE31.10-N-1001-01A

If the minimum dimension is dropped below



Replace trailer hitch subject to separate repair order.

6

Check trailer coupling is firmly seated

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

Check values for trailer hitch

Number

Designation

Model 906, 907 with code Q20 Rockinger trailer hitch, model 243

BE31.10-N-1001-01A

Coupling bolt

Vertical clearance

mm

2,0

Minimum diameter

mm

36,5