Maintenance work on the carrier
7.19 Towbar coupling
7 - 140 3 302 744 en Maintenance manual
GMK5250L
09.03.2018
7.19.6 Checking the support ring
Prerequisites – The coupling must be closed; à p. 7 - 136.
Checking the
support ring
• Check the support ring (1) at the bottom of
the coupling jaw.
When the trailer is coupled, the draw eyelet
of the trailer must not be in contact with the
lower bushing (2).
Have the support ring changed if:
– The trailer's draw eyelet touches the lower
bushing because of wear or
– The support ring has reached its wear limit
of H = 14 mm (0.55 in).
7.19.7 Checking the function of the coupling jaw/
resetting the central position
Spare parts and
tool
– Torque wrench for torque of 58 Nm (42.7 lbf ft).
Prerequisites – The coupling must be closed; à p. 7 - 136.
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