Maintenance work on the carrier
7.17 Towbar coupling
03.11.2017
Maintenance manual 3 302 574 en 7 - 123
GMK3060
7.17.4 Checking the lower bushing
Prerequisites – The coupling must be closed; à p. 7 - 120.
Checking the
bushing
• Check the internal diameter of the lower
bushing. The dimension D must not exceed
the following values:
If the dimension is larger than that given
above, have the bushing replaced by
Manitowoc Crane Care or an authorised GROVE
dealer or your specialist repair crew.
7.17.5 Checking the initial tension of the springs
The coupling head should require physical force to twist it when checking
the torque.
• Twist the coupling head clockwise and anticlockwise to check the initial
tension of the rubber springs.
Model series 400: 31.5 mm (1.25 in)
Model series 700: 34.2 mm (1.35 in)
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