Checking The Lower Bushing; Checking The Initial Tension Of The Springs - Manitowoc Grove GMK 5250L Maintenance Manual

7.19.4
Prerequisites
Checking the
bushing
7.19.5
Maintenance manual
GMK5250L

Checking the lower bushing

– The coupling must be closed;

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.
à
p. 7 - 136.
•
Check the internal diameter of the lower
bushing. The dimension D must not exceed
the following values:
Model series 400: 31.5 mm (1.25 in)
Model series 700: 34.2 mm (1.35 in)
If the dimension is larger than that given
above, have the bushing replaced by
Manitowoc Crane Care
GROVE dealer or your specialist repair
crew.
3 302 744 en
Maintenance work on the carrier
7.19 Towbar coupling
M 3
or an authorised
M 3
7 - 139