1 | Safety knob |
2 | Coupling bolt |
3 | Handlever |
N31.10-2025-01
N31.10-2026-01
| 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 | |||
Side clearance is exceeded. | |||
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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 | |||
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. |